1
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Bashir R, Bilal MK, Bashir A, Asif SU, Peng Y. ZnO/SrTiO 3, ZnO/WO 3, and ZnO/Zn 2SnO 4 Bilayer as Electron Transport Layers for Lead Sulfide Colloidal Quantum Dots Solar Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2402500. [PMID: 39246184 DOI: 10.1002/smll.202402500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 08/21/2024] [Indexed: 09/10/2024]
Abstract
In order to enhance the overall efficiency of colloidal quantum dots solar cells, it is crucial to suppress the recombination of charge carriers and minimize energy loss at the interfaces between the transparent electrode, electron transport layer (ETL), and colloidal quantum dots (CQDs) light-absorbing material. In the current study, ZnO/SrTiO3 (STO), ZnO/WO3 (TO), and ZnO/Zn2SnO4 (ZTO) bilayers are introduced as an ETL using a spin-coating technique. The ZTO interlayer exhibits a smoother surface with a root-mean-square (RMS) value of ≈ 3.28 nm compared to STO and TO interlayers, which enables it to cover the surface of the ITO/ZnO substrate entirely and helps to prevent direct contact between the CQDs absorber layer and the ITO/ZnO substrate, thereby effectively preventing efficient charge recombination at the interfaces of the ETL/CQDs. Furthermore, the ZTO interlayer possesses superior electron mobility, a higher visible light transmission, and a suitable energy band structure compared to STO and TO. These characteristics are advantageous for extracting charge carriers and facilitating electron transport. The PbS CQDs solar cell based on the ITO/ZnO/ZTO/PbS-FABr/PbS-EDT/NiO/Au device configuration exhibits the highest efficiency of 15.28%, which is significantly superior than the ITO/ZnO/PbS-FABr/PbS-EDT/NiO/Au solar cell device (PCE = 14.38%). This study is anticipated to offer a practical approach to develop ultrathin and compact ETL for highly efficient CQDSCs.
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Affiliation(s)
- Rabia Bashir
- Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, P. R. China
| | - Muhammad Kashif Bilal
- Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, P. R. China
| | - Amna Bashir
- Department of Chemistry, Fatima Jinnah Women University, Rawalpindi, 46000, Pakistan
| | - Sana Ullah Asif
- Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, P. R. China
| | - Yicheng Peng
- Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, P. R. China
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2
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Chiu A, Lu C, Kachman DE, Rong E, Chintapalli SM, Lin Y, Khurgin D, Thon SM. Role of the ZnO electron transport layer in PbS colloidal quantum dot solar cell yield. NANOSCALE 2024; 16:8273-8285. [PMID: 38592692 DOI: 10.1039/d3nr06558h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
The development of lead sulfide (PbS) colloidal quantum dot (CQD) solar cells has led to significant power conversion efficiency (PCE) improvements in recent years, with record efficiencies now over 15%. Many of the recent advances in improving PCE have focused on improving the interface between the PbS CQD active layer and the zinc oxide (ZnO) electron transport layer (ETL). Proper optimization of the ZnO ETL also increases yield, or the percentage of functioning devices per fabrication run. Simultaneous improvements in both PCE and yield will be critical as the field approaches commercialization. This review highlights recent advances in the synthesis of ZnO ETLs and discusses the impact and critical role of ZnO synthesis conditions on the PCE and yield of PbS CQD solar cells.
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Affiliation(s)
- Arlene Chiu
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
| | - Chengchangfeng Lu
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
| | - Dana E Kachman
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
| | - Eric Rong
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
| | - Sreyas M Chintapalli
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
| | - Yida Lin
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
| | - Daniel Khurgin
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
| | - Susanna M Thon
- Department of Electrical and Computer Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA.
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland, 21218, USA
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3
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Choi YK, Kim TH, Jung BK, Park T, Lee YM, Oh S, Choi HJ, Park J, Bae SI, Lee Y, Shim JW, Park HY, Oh SJ. High-Performance Self-Powered Quantum Dot Infrared Photodetector with Azide Ion Solution Treated Electron Transport Layer. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308375. [PMID: 38073328 DOI: 10.1002/smll.202308375] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/15/2023] [Indexed: 05/03/2024]
Abstract
The demand for self-powered photodetectors (PDs) capable of NIR detection without external power is growing with the advancement of NIR technologies such as LIDAR and object recognition. Lead sulfide quantum dot-based photodetectors (PbS QPDs) excel in NIR detection; however, their self-powered operation is hindered by carrier traps induced by surface defects and unfavorable band alignment in the zinc oxide nanoparticle (ZnO NP) electron-transport layer (ETL). In this study, an effective azide-ion (N3 -) treatment is introduced on a ZnO NP ETL to reduce the number of traps and improve the band alignment in a PbS QPD. The ZnO NP ETL treated with azide ions exhibited notable improvements in carrier lifetime and mobility as well as an enhanced internal electric field within the thin-film heterojunction of the ZnO NPs and PbS QDs. The azide-ion-treated PbS QPD demonstrated a increase in short-circuit current density upon NIR illumination, marking a responsivity of 0.45 A W-1, specific detectivity of 4 × 1011 Jones at 950 nm, response time of 8.2 µs, and linear dynamic range of 112 dB.
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Affiliation(s)
- Young Kyun Choi
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Tae Hyuk Kim
- School of Electrical Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Byung Ku Jung
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Taesung Park
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Yong Min Lee
- Department of Semiconductor Systems Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Seongkeun Oh
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Hyung Jin Choi
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Junhyeok Park
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Sang-In Bae
- Samsung Electronics Co. Ltd, Yongin-si, 17113, Republic of Korea
| | - YunKi Lee
- Samsung Electronics Co. Ltd, Yongin-si, 17113, Republic of Korea
| | - Jae Won Shim
- School of Electrical Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Hye Yeon Park
- Samsung Electronics Co. Ltd, Yongin-si, 17113, Republic of Korea
| | - Soong Ju Oh
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
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4
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Wang M, Liu S, Wei A, Luo T, Wen X, Li MY, Lu H. Effective Charge Collection of Electron Transport Layers for High-Performance Quantum Dot Infrared Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38690767 DOI: 10.1021/acsami.4c02069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
Infrared (IR) solar cells, capable of converting low-energy IR photons to electron-hole pairs, are promising optoelectronic devices by broadening the utilization range of the solar spectrum to the short-wavelength IR region. The emerging PbS colloidal quantum dot (QD) IR solar cells attract much attention due to their tunable band gaps in the IR region, potential multiple exciton generation, and facile solution processing. In PbS QD solar cells, ZnO is commonly utilized as an electron transport layer (ETL) to establish a depleted heterostructure with a QD photoactive layer. However, band gap shrinkage of large PbS QDs makes it necessary to tailor the behaviors of the ZnO ETL for efficient carrier extraction in the devices. Herein, the characteristics of ZnO ETL are efficiently and flexibly tailored to match the QD layer by handily adjusting the postannealing process of ZnO ETL. With a suitable temperature, the well-matched energy level alignment and suppressed trap states are simultaneously achieved in the ZnO ETL, effectively reducing the nonradiative recombination and accelerating the electron injection from the QD layer to ETL. As a consequence, a high-performance PbS QD photovoltaic device with power conversion efficiencies (PCEs) of 10.09% and 1.37% is obtained under AM 1.5 and 1100 nm filtered solar illumination, demonstrating a simple and effective approach for achieving high-performance IR photoelectric devices.
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Affiliation(s)
- Meng Wang
- School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China
| | - Sisi Liu
- School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China
| | - Aoshen Wei
- School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China
| | - Tianyu Luo
- School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China
| | - Xiaoyan Wen
- School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China
| | - Ming-Yu Li
- School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China
- Yangtzi Delta Region Institute of University of Electronic Science and Technology of China, Huzhou, Zhejiang 313098, China
| | - Haifei Lu
- School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China
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5
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Jung BK, Park T, Choi YK, Lee YM, Kim TH, Seo B, Oh S, Shim JW, Lo YH, Ng TN, Oh SJ. An ultra-sensitive colloidal quantum dot infrared photodiode exceeding 100 000% external quantum efficiency via photomultiplication. NANOSCALE HORIZONS 2024; 9:487-494. [PMID: 38260954 DOI: 10.1039/d3nh00456b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
In this study, we present ultrasensitive infrared photodiodes based on PbS colloidal quantum dots (CQDs) using a double photomultiplication strategy that utilizes the accumulation of both electron and hole carriers. While electron accumulation was induced by ZnO trap states that were created by treatment in a humid atmosphere, hole accumulation was achieved using a long-chain ligand that increased the barrier to hole collection. Interestingly, we obtained the highest responsivity in photo-multiplicative devices with the long ligands, which contradicts the conventional belief that shorter ligands are more effective for optoelectronic devices. Using these two charge accumulation effects, we achieved an ultrasensitive detector with a responsivity above 7.84 × 102 A W-1 and an external quantum efficiency above 105% in the infrared region. We believe that the photomultiplication effect has great potential for surveillance systems, bioimaging, remote sensing, and quantum communication.
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Affiliation(s)
- Byung Ku Jung
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
| | - Taesung Park
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
| | - Young Kyun Choi
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
| | - Yong Min Lee
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
| | - Tae Hyuk Kim
- School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Bogyeom Seo
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093-0407, USA
| | - Seongkeun Oh
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
| | - Jae Won Shim
- School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Yu-Hwa Lo
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093-0407, USA
| | - Tse Nga Ng
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093-0407, USA
| | - Soong Ju Oh
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
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6
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He J, Ge Y, Wang Y, Yuan M, Xia H, Zhang X, Chen X, Wang X, Zhou X, Li K, Chen C, Tang J. Fluoride passivation of ZnO electron transport layers for efficient PbSe colloidal quantum dot photovoltaics. FRONTIERS OF OPTOELECTRONICS 2023; 16:28. [PMID: 37889375 PMCID: PMC10611680 DOI: 10.1007/s12200-023-00082-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 09/08/2023] [Indexed: 10/28/2023]
Abstract
Lead selenide (PbSe) colloidal quantum dots (CQDs) are suitable for the development of the next-generation of photovoltaics (PVs) because of efficient multiple-exciton generation and strong charge coupling ability. To date, the reported high-efficient PbSe CQD PVs use spin-coated zinc oxide (ZnO) as the electron transport layer (ETL). However, it is found that the surface defects of ZnO present a difficulty in completion of passivation, and this impedes the continuous progress of devices. To address this disadvantage, fluoride (F) anions are employed for the surface passivation of ZnO through a chemical bath deposition method (CBD). The F-passivated ZnO ETL possesses decreased densities of oxygen vacancy and a favorable band alignment. Benefiting from these improvements, PbSe CQD PVs report an efficiency of 10.04%, comparatively 9.4% higher than that of devices using sol-gel (SG) ZnO as ETL. We are optimistic that this interface passivation strategy has great potential in the development of solution-processed CQD optoelectronic devices.
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Affiliation(s)
- Jungang He
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
- Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - You Ge
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Ya Wang
- Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Mohan Yuan
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Hang Xia
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Xingchen Zhang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Xiao Chen
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Xia Wang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Xianchang Zhou
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Kanghua Li
- Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Chao Chen
- Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Jiang Tang
- Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, China
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7
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Kim JH, Jung BK, Kim SK, Yun KR, Ahn J, Oh S, Jeon MG, Lee TJ, Kim S, Oh N, Oh SJ, Seong TY. Ultrasensitive Near-Infrared InAs Colloidal Quantum Dot-ZnON Hybrid Phototransistor Based on a Gradated Band Structure. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023:e2207526. [PMID: 37088787 DOI: 10.1002/advs.202207526] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 03/14/2023] [Indexed: 05/03/2023]
Abstract
Amorphous metal oxide semiconductor phototransistors (MOTPs) integrated with colloidal quantum dots (QDs) (QD-MOTPs) are promising infrared photodetectors owing to their high photoconductive gain, low off-current level, and high compatibility with pixel circuits. However, to date, the poor mobility of conventional MOTPs, such as indium gallium zinc oxide (IGZO), and the toxicity of lead (Pb)-based QDs, such as lead sulfide and lead selenide, has limited the commercial applications of QD-MOTPs. Herein, an ultrasensitive QD-MOTP fabricated by integrating a high-mobility zinc oxynitride (ZnON)-based MOTP and lead-free indium arsenide (InAs) QDs is demonstrated. A new gradated bandgap structure is introduced in the InAs QD layer that absorbs infrared light, which prevents carriers from moving backward and effectively reduces electron-hole recombination. Chemical, optical, and structural analyses confirm the movement of the photoexcited carriers in the graded band structure. The novel QD-MOTP exhibits an outstanding performance with a responsivity of 1.15 × 105 A W-1 and detectivity of 5.32 × 1016 Jones at a light power density of 2 µW cm-2 under illumination at 905 nm.
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Affiliation(s)
- Jong-Ho Kim
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Byung Ku Jung
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Su-Kyung Kim
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Kwang-Ro Yun
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Junhyuk Ahn
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Seongkeun Oh
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Min-Gyu Jeon
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Tae-Ju Lee
- Department of Nanophotonics, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Seongchan Kim
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04673, Republic of Korea
| | - Nuri Oh
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04673, Republic of Korea
| | - Soong Ju Oh
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Tae-Yeon Seong
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
- Department of Nanophotonics, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
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8
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Parmar DH, M Pina J, Zhu T, Vafaie M, Atan O, Biondi M, Najjariyan AM, Hoogland S, Sargent EH. Controlled Crystal Plane Orientations in the ZnO Transport Layer Enable High-Responsivity, Low-Dark-Current Infrared Photodetectors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200321. [PMID: 35230725 DOI: 10.1002/adma.202200321] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 02/21/2022] [Indexed: 06/14/2023]
Abstract
Colloidal quantum dots (CQD) have emerged as attractive materials for infrared (IR) photodetector (PD) applications because of their tunable bandgaps and facile processing. Presently, zinc oxide is the electron-transport layer (ETL) of choice in CQD PDs; however, ZnO relies on continuous ultraviolet (UV) illumination to remove adsorbed oxygen and maintain high external quantum efficiency (EQE), speed, and photocurrent. Here, it is shown that ZnO is dominated by electropositive crystal planes which favor excessive oxygen adsorption, and that this leads to a high density of trap states, an undesired shift in band alignment, and consequent poor performance. Over prolonged operation without UV exposure, oxygen accumulates at the electropositive planes, trapping holes and degrading performance. This problem is addressed by developing an electroneutral plane composition at the ZnO surface, aided by atomic layer deposition (ALD) as the means of materials processing. It is found that ALD ZnO has 10× lower binding energy for oxygen than does conventionally deposited ZnO. IR CQD PDs made with this ETL do not require UV activation to maintain low dark current and high EQE.
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Affiliation(s)
- Darshan H Parmar
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Joao M Pina
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Tong Zhu
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Maral Vafaie
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Ozan Atan
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Margherita Biondi
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Amin M Najjariyan
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Sjoerd Hoogland
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
| | - Edward H Sargent
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada
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9
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Li M, Chen S, Zhao X, Xiong K, Wang B, Shah UA, Gao L, Lan X, Zhang J, Hsu HY, Tang J, Song H. Matching Charge Extraction Contact for Infrared PbS Colloidal Quantum Dot Solar Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2105495. [PMID: 34859592 DOI: 10.1002/smll.202105495] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 10/21/2021] [Indexed: 05/17/2023]
Abstract
Infrared solar cells (IRSCs) can supplement silicon or perovskite SCs to broaden the utilization of the solar spectrum. As an ideal infrared photovoltaic material, PbS colloidal quantum dots (CQDs) with tunable bandgaps can make good use of solar energy, especially the infrared region. However, as the QD size increases, the energy level shrinking and surface facet evolution makes us reconsider the matching charge extraction contacts and the QD passivation strategy. Herein, different to the traditional sol-gel ZnO layer, energy-level aligned ZnO thin film from a magnetron sputtering method is adopted for electron extraction. In addition, a modified hybrid ligand recipe is developed for the facet passivation of large size QDs. As a result, the champion IRSC delivers an open circuit voltage of 0.49 V and a power conversion efficiency (PCE) of 10.47% under AM1.5 full-spectrum illumination, and the certified PCE is over 10%. Especially the 1100 nm filtered efficiency achieves 1.23%. The obtained devices also show high storage stability. The present matched electron extraction and QD passivation strategies are expected to highly booster the IR conversion yield and promote the fast development of new conception QD optoelectronics.
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Affiliation(s)
- Mingyu Li
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
- Wenzhou Advanced Manufacturing Technology Research Institute of Huazhong University of Science and Technology, Wenzhou, Zhejiang, P. R. China
| | - Shiwu Chen
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Xinzhao Zhao
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Kao Xiong
- School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Bo Wang
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Usman Ali Shah
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Liang Gao
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Xinzheng Lan
- School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Jianbing Zhang
- School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Hsien-Yi Hsu
- School of Energy and Environment & Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, 999077, China
| | - Jiang Tang
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
- School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
| | - Haisheng Song
- Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
- Wenzhou Advanced Manufacturing Technology Research Institute of Huazhong University of Science and Technology, Wenzhou, Zhejiang, P. R. China
- School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China
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10
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Hafiz SB, Al Mahfuz MM, Lee S, Ko DK. Midwavelength Infrared p-n Heterojunction Diodes Based on Intraband Colloidal Quantum Dots. ACS APPLIED MATERIALS & INTERFACES 2021; 13:49043-49049. [PMID: 34613686 DOI: 10.1021/acsami.1c14749] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
As an emerging member of the colloidal semiconductor quantum dot materials family, intraband quantum dots are being extensively studied for thermal infrared sensing applications. High-performance detectors can be realized using a traditional p-n junction device design; however, the heavily doped nature of intraband quantum dots presents a new challenge in realizing diode devices. In this work, we utilize a trait uniquely available in a colloidal quantum dot material system to overcome this challenge: the ability to blend two different types of quantum dots to control the electrical property of the resulting film. We report on the preparation of binary mixture films containing midwavelength infrared Ag2Se intraband quantum dots and the fabrication of p-n heterojunction diodes with strong rectifying characteristics. The peak specific detectivity at 4.5 μm was measured to be 107 Jones at room temperature, which is an orders of magnitude improvement compared to the previous generation of intraband quantum dot detectors.
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Affiliation(s)
- Shihab Bin Hafiz
- Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Mohammad M Al Mahfuz
- Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Sunghwan Lee
- School of Engineering Technology, Purdue University, West Lafayette, Indiana 47907, United States
| | - Dong-Kyun Ko
- Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
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11
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Park T, Woo HK, Jung BK, Park B, Bang J, Kim W, Jeon S, Ahn J, Lee Y, Lee YM, Kim TI, Oh SJ. Noninterference Wearable Strain Sensor: Near-Zero Temperature Coefficient of Resistance Nanoparticle Arrays with Thermal Expansion and Transport Engineering. ACS NANO 2021; 15:8120-8129. [PMID: 33792304 DOI: 10.1021/acsnano.0c09835] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this study, non-temperature interference strain gauge sensors, which are only sensitive to strain but not temperature, are developed by engineering the properties and structure from a material perspective. The environmental interference from temperature fluctuations is successfully eliminated by controlling the charge transport in nanoparticles with thermally expandable polymer substrates. Notably, the negative temperature coefficient of resistance (TCR), which originates from the hopping transport in nanoparticle arrays, is compensated by the positive TCR of the effective surface thermal expansion with anchoring effects. This strategy successfully controls the TCR from negative to positive. A near-zero TCR (NZTCR), less than 1.0 × 10-6 K-1, is achieved through precisely controlled expansion. Various characterization methods and finite element and transport simulations are conducted to investigate the correlated electrical, mechanical, and thermal properties of the materials and elucidate the compensated NZTCR mechanism. With this strategy, an all-solution-processed, transparent, highly sensitive, and noninterference strain sensor is fabricated with a gauge factor higher than 5000 at 1% strain, as demonstrated by pulse and motion sensing, as well as the noninterference property under variable-temperature conditions. It is envisaged that the sensor developed herein is applicable to multifunctional wearable sensors or e-skins for artificial skin or robots.
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Affiliation(s)
- Taesung Park
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Ho Kun Woo
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Byung Ku Jung
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Byeonghak Park
- School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Junsung Bang
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Woosik Kim
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Sanghyun Jeon
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Junhyuk Ahn
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Yunheum Lee
- Department of Biomedical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Yong Min Lee
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Tae-Il Kim
- School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Department of Biomedical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Soong Ju Oh
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea
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12
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Yuan Y, Liu C, Li Y, Li J. Influence of Annealing Temperature Modulation on the Structural and Optical Properties of ZnSe Thin Films. CRYSTAL RESEARCH AND TECHNOLOGY 2021. [DOI: 10.1002/crat.202000177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yafei Yuan
- Department of Electronic Engineering Center for Intelligent Medical Electronics Fudan University Shanghai 200433 China
| | - Chunmin Liu
- Department of Optical Science and Engineering Shanghai Ultra‐Precision Optical Manufacturing Engineering Center Fudan University Shanghai 200433 China
| | - Yaopeng Li
- Department of Optical Science and Engineering Shanghai Ultra‐Precision Optical Manufacturing Engineering Center Fudan University Shanghai 200433 China
| | - Jing Li
- Department of Optical Science and Engineering Shanghai Ultra‐Precision Optical Manufacturing Engineering Center Fudan University Shanghai 200433 China
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13
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Kamyabi MA, Alipour Z, Moharramnezhad M. An enzyme-free electrochemiluminescence insulin probe based on the regular attachment of ZnO nanoparticles on a 3-D nickel foam and H 2O 2 as an efficient co-reactant. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:1003-1012. [PMID: 33533767 DOI: 10.1039/d0ay02071k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this study, a highly sensitive, fast, and enzyme-free electrochemiluminescence (ECL) probe based on the decoration of zinc oxide nanoparticles on nickel foam is proposed for insulin determination. A silica film was employed as a size adjusting agent for the modification of the nickel foam surface with ZnO nanoparticles (ZnO NPs). The ECL of the ZnO NP/Ni foam was investigated in a natural medium in the presence of hydrogen peroxide (H2O2) as an efficient co-reactant. With increasing insulin concentration, a remarkable improvement in ECL signal was observed, which proved the enhancing effect of insulin on the ECL emission. The characterization of the ZnO-NP/Ni-foam electrode was performed via electrochemical impedance spectroscopy, Brunauer-Emmett-Teller (BET) surface area measurement, X-ray diffraction, field emission scanning electron microscopy (FESEM), and energy-dispersive X-ray analysis techniques. The fabricated electrode was applied for the trace analysis of insulin using the ultrasensitive ECL method in a phosphate buffer solution. Under the optimal conditions, the results showed excellent performance during insulin determination with a wide linear range of 3.57 × 10-15 M to 2.94 × 10-9 M, a low detection limit of 1.00 × 10-16 M, and a relative standard deviation of 1.03%. The proposed ECL sensor with excellent reproducibility, long-term stability, and high selectivity was used for insulin determination in real serum samples with acceptable outcomes.
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Affiliation(s)
- Mohammad Ali Kamyabi
- Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, Postal Code 45371-38791, Zanjan, Iran.
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Sevim Ünlütürk S, Akdoğan Y, Özçelik S. Mn 2+ ions incorporated into ZnS x Se 1-x colloidal quantum dots: controlling size and composition of nanoalloys and regulating magnetic dipolar interactions. NANOTECHNOLOGY 2021; 32:165701. [PMID: 33533335 DOI: 10.1088/1361-6528/abdb65] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A facile synthesis method is introduced how to prepare magnetically active ultraviolet emitting manganese ions incorporated into ZnS x Se1-x colloidal quantum dot (nanoalloy) at 110 °C in aqueous solutions. The reaction time is the main factor to control the hydrodynamic size from 3 to 10 nm and the precursor ratio is significant to tune the alloy composition. ZnS shell layer on the ZnS x Se1-x core was grown to passivate environmental effects. The nanoalloy has ultraviolet emission at 380 nm having a lifetime of 80 ns and 7% quantum yield. The incorporation of Mn2+ ions into the nanoalloys induced magnetic activity but did not modify the structure and photophysical properties of the nanoalloys. Colloidal and powdery samples were prepared and analyzed by electron paramagnetic resonance (EPR) spectroscopy. In the colloidal dispersions, EPR spectra showed hyperfine line splitting regardless of the Mn2+ ion fractions, up to 6%, indicating that Mn2+ ions incorporated into the nanoalloys were isolated. EPR signals of the powdery samples were broadened when the fraction of Mn2+ ions was higher than 0.1%. The EPR spectra were simulated to reveal the locations and interactions of Mn2+ ions. The simulations suggest that the Mn2+ ions are located on the nanoalloy surfaces. These findings infer that the magnetic dipolar interactions are regulated by the initial mole ratio of Mn/Zn and the physical state of the nanoalloys adjusted by preparation methods.
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Affiliation(s)
- Seçil Sevim Ünlütürk
- Department of Chemistry, İzmir Institute of Technology, 35430 Gülbahçe, Urla, İzmir, Turkey
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15
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Kamyabi MA, Alipour Z, Moharramnezhad M. Amplified cathodic electrochemiluminescence of luminol based on zinc oxide nanoparticle modified Ni-foam electrode for ultrasensitive detection of amoxicillin. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04820-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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16
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Kwon JB, Kim SW, Kang BH, Yeom SH, Lee WH, Kwon DH, Lee JS, Kang SW. Air-stable and ultrasensitive solution-cast SWIR photodetectors utilizing modified core/shell colloidal quantum dots. NANO CONVERGENCE 2020; 7:28. [PMID: 32803407 PMCID: PMC7429620 DOI: 10.1186/s40580-020-00238-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 07/16/2020] [Indexed: 06/11/2023]
Abstract
InGaAs-based photodetectors have been generally used for detection in the short-wave infrared (SWIR) region. However, the epitaxial process used to grow these materials is expensive; therefore, InGaAs-based photodetectors are limited to space exploration and military applications. Many researchers have expended considerable efforts to address the problem of SWIR photodetector development using lead sulfide (PbS) quantum dots (QDs). Along with their cost-efficient solution processability and flexible substrate compatibility, PbS QDs are highly interesting for the quantum-size-effect tunability of their bandgaps, spectral sensitivities, and wide absorption ranges. However, the performance of PbS QD-based SWIR photodetectors is limited owing to inefficient carrier transfer and low photo and thermal stabilities. In this study, a simple method is proposed to overcome these problems by incorporating CdS in PbS QD shells to provide efficient carrier transfer and enhance the long-term stability of SWIR photodetectors against oxidation. The SWIR photodetectors fabricated using thick-shell PbS/CdS QDs exhibited a high on/off (light/dark) ratio of 11.25 and a high detectivity of 4.0 × 1012 Jones, which represents a greater than 10 times improvement in these properties relative to those of PbS QDs. Moreover, the lifetimes of thick-shell PbS/CdS QD-based SWIR photodetectors were significantly improved owing to the self-passivation of QD surfaces.
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Affiliation(s)
- Jin-Beom Kwon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Sae-Wan Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Byoung-Ho Kang
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea
| | - Se-Hyuk Yeom
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea
| | - Wang-Hoon Lee
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea
| | - Dae-Hyuk Kwon
- Department of Electronic Engineering, Kyungil University, Hayang-up, 712-702, Gyeongsang buk-do, Republic of Korea
| | - Jae-Sung Lee
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea.
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