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Nath B, Behera SK, Kumar J, Hemmerle A, Fontaine P, Ramamurthy PC, Mahapatra DR, Hegde G. Understanding the Heterointerfaces in Perovskite Solar Cells via Hole Selective Layer Surface Functionalization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2307547. [PMID: 38030567 DOI: 10.1002/adma.202307547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 11/27/2023] [Indexed: 12/01/2023]
Abstract
Interfaces in perovskite solar cells (PSCs) play a pivotal role in determining device performance by influencing charge transport and recombination. Understanding the physical processes at these interfaces is essential for achieving high-power conversion efficiency in PSCs. Particularly, the interfaces involving oxide-based transport layers are susceptible to defects like dangling bonds, excess oxygen, or oxygen deficiency. To address this issue, the surface of NiOx is passivated using octadecylphosphonic acid (ODPA), resulting in improved charge transport across the perovskite hole transport layer (HTL) interface. This surface treatment has led to the development of hysteresis-free devices with an impressive ≈13% increase in power conversion efficiency. Computational studies have explored the halide perovskite architecture of ODPA-treated HTL/Perovskite, aiming to unlock superior photovoltaic performance. The ODPA surface functionalization has demonstrated enhanced device performance, characterized by superior charge exchange capacity. Moreover, higher band-to-band recombination in photoluminescence and electroluminescence indicates presence of lower mid-gap energy states, thereby increasing the effective photogenerated carrier density. These findings are expected to promote the utilization of various phosphonic acid-based self-assembly monolayers for surface passivation of oxide-based transport layers in perovskite solar cells. Ultimately, this research contributes to the realization of efficient halide PSCs by harnessing the favorable architecture of NiOx interfaces.
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Affiliation(s)
- Bidisha Nath
- Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
| | - Sushant K Behera
- Department of Materials Engineering, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
| | - Jeykishan Kumar
- Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
| | - Arnaud Hemmerle
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91190, France
| | - Philippe Fontaine
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91190, France
| | - Praveen C Ramamurthy
- Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
- Department of Materials Engineering, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
| | - Debiprosad Roy Mahapatra
- Centre for Biosystems Science and Engineering, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
| | - Gopalkrishna Hegde
- Department of Aerospace Engineering, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
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2
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Xiao C, Zhai Y, Song Z, Wang K, Wang C, Jiang CS, Beard MC, Yan Y, Al-Jassim M. Operando Characterizations of Light-Induced Junction Evolution in Perovskite Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2023; 15:20909-20916. [PMID: 37071499 PMCID: PMC10165603 DOI: 10.1021/acsami.2c22801] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Light-induced performance changes in metal halide perovskite solar cells (PSCs) have been studied intensively over the last decade, but little is known about the variation in microscopic optoelectronic properties of the perovskite heterojunctions in a completed device during operation. Here, we combine Kelvin probe force microscopy and transient reflection spectroscopy techniques to spatially resolve the evolution of junction properties during the operation of metal-halide PSCs and study the light-soaking effect. Our analysis showed a rise of an electric field at the hole-transport layer side, convoluted with a more reduced interfacial recombination rate at the electron-transport layer side in the PSCs with an n-i-p structure. The junction evolution is attributed to the effects of ion migration and self-poling by built-in voltage. Device performances are correlated with the changes of electrostatic potential distribution and interfacial carrier dynamics. Our results demonstrate a new route for studying the complex operation mechanism in PSCs.
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Affiliation(s)
- Chuanxiao Xiao
- National Renewable Energy Laboratory (NREL), Golden, Colorado 80401, United States
| | - Yaxin Zhai
- National Renewable Energy Laboratory (NREL), Golden, Colorado 80401, United States
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha 410081, China
| | - Zhaoning Song
- The University of Toledo, Toledo, Ohio 43606, United States
| | - Kang Wang
- National Renewable Energy Laboratory (NREL), Golden, Colorado 80401, United States
| | - Changlei Wang
- The University of Toledo, Toledo, Ohio 43606, United States
| | - Chun-Sheng Jiang
- National Renewable Energy Laboratory (NREL), Golden, Colorado 80401, United States
| | - Matthew C Beard
- National Renewable Energy Laboratory (NREL), Golden, Colorado 80401, United States
| | - Yanfa Yan
- The University of Toledo, Toledo, Ohio 43606, United States
| | - Mowafak Al-Jassim
- National Renewable Energy Laboratory (NREL), Golden, Colorado 80401, United States
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3
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Chen CH, Su ZH, Lou YH, Yu YJ, Wang KL, Liu GL, Shi YR, Chen J, Cao JJ, Zhang L, Gao XY, Wang ZK. Full-Dimensional Grain Boundary Stress Release for Flexible Perovskite Indoor Photovoltaics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200320. [PMID: 35201633 DOI: 10.1002/adma.202200320] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 02/15/2022] [Indexed: 06/14/2023]
Abstract
Perovskite photovoltaics are strong potential candidates to drive low-power off-grid electronics for indoor applications. Compared with rigid devices, flexible perovskite devices can provide a more suitable surface for indoor small electronic devices, enabling them have a broader indoor application prospect. However, the mechanical stability of flexible perovskite photovoltaics is an urgent issue solved. Herein, a kind of 3D crosslinking agent named borax is selected to carry out grain boundary penetration treatment on perovskite film to realize full-dimensional stress release. This strategy improves the mechanical and phase stabilities of perovskite films subjected to external forces or large temperature changes. The fabricated perovskite photovoltaics deliver a champion power conversion efficiency (PCE) of 21.63% under AM 1.5G illumination, which is the highest one to date. The merit of low trap states under weak light makes the devices present a superior indoor PCE of 31.85% under 1062 lux (LED, 2956 K), which is currently the best flexible perovskite indoor photovoltaic device. This work provides a full-dimensional grain boundary stress release strategy for highly stable flexible perovskite indoor photovoltaics.
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Affiliation(s)
- Chun-Hao Chen
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Zhen-Huang Su
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Yan-Hui Lou
- College of Energy, Soochow Institute for Energy and Materials Innovations, Soochow University, Suzhou, 215006, China
| | - Yan-Jun Yu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Kai-Li Wang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Gen-Lin Liu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Yi-Ran Shi
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Jing Chen
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Jun-Jie Cao
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Liang Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
| | - Xing-Yu Gao
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Zhao-Kui Wang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China
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Feng Q, Zhang X, Nan G. Unveiling the Nature of Light-Triggered Hole Traps in Lead Halide Perovskites: A Study with Time-Dependent Density Functional Theory. J Phys Chem Lett 2021; 12:12075-12083. [PMID: 34910490 DOI: 10.1021/acs.jpclett.1c03652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Structural variations of lead halide perovskites (LHPs) upon light illumination play an important role in their photovoltaic applications. However, density functional theory (DFT)-based simulations have often been performed to unveil the nature of defects in LHPs without light illumination. So far, the nature of traps in LHPs triggered by the light remains largely unexplored. In this work, hole traps induced by the halogen interstitial in LHPs are studied by combining DFT and time-dependent DFT approaches, the latter of which treats electron-hole and electron-nuclei interactions on the same footing. Both a semilocal exchange functional and hybrid functional are adopted to relax the ground-state and excited-state geometries followed by the calculations of energy levels of hole traps. The effect of the self-interaction corrections on the light-triggered geometric deformation and the electronic structure of hole traps is analyzed. Relaxation energies that correspond to the light-triggered geometric deformation are also calculated with different functionals. The relationship between the hole traps and light-triggered geometric variations are then explored.
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Affiliation(s)
- Qingjie Feng
- Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, P. R. China
| | - Xu Zhang
- Department of Physics and Astronomy, California State University Northridge, Northridge, California 91330-8268, United States
| | - Guangjun Nan
- Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, P. R. China
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Guerrero A, Bisquert J, Garcia-Belmonte G. Impedance Spectroscopy of Metal Halide Perovskite Solar Cells from the Perspective of Equivalent Circuits. Chem Rev 2021; 121:14430-14484. [PMID: 34845904 DOI: 10.1021/acs.chemrev.1c00214] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Impedance spectroscopy (IS) provides a detailed understanding of the dynamic phenomena underlying the operation of photovoltaic and optoelectronic devices. Here we provide a broad summary of the application of IS to metal halide perovskite materials, solar cells, electrooptic and memory devices. IS has been widely used to characterize perovskite solar cells, but the variability of samples and the presence of coupled ionic-electronic effects form a complex problem that has not been fully solved yet. We summarize the understanding that has been obtained so far, the basic methods and models, as well as the challenging points still present in this research field. Our approach emphasizes the importance of the equivalent circuit for monitoring the parameters that describe the response and providing a physical interpretation. We discuss the possibilities of models from the general perspective of solar cell behavior, and we describe the specific aspects and properties of the metal halide perovskites. We analyze the impact of the ionic effects and the memory effects, and we describe the combination of light-modulated techniques such as intensity modulated photocurrent spectroscopy (IMPS) for obtaining more detailed information in complex cases. The transformation of the frequency to time domain is discussed for the consistent interpretation of time transient techniques and the prediction of features of current-voltage hysteresis. We discuss in detail the stability issues and the occurrence of transformations of the sample coupled to the measurements.
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Affiliation(s)
- Antonio Guerrero
- Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain
| | - Juan Bisquert
- Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain.,Yonsei Frontier Lab, Yonsei University, Seoul 03722, South Korea
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Bhattacharya S, Chandra GK, Predeep P. A Microstructural Analysis of 2D Halide Perovskites: Stability and Functionality. FRONTIERS IN NANOTECHNOLOGY 2021. [DOI: 10.3389/fnano.2021.657948] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Recent observations have demonstrated that the photoelectric conversion properties of perovskite materials are intimately related to the presence of superlattice structures and other unusual nanoscale features in them. The low-dimensional or mixed-dimensional halide perovskite families are found to be more efficient materials for device application than three-dimensional halide perovskites. The emergence of perovskite solar cells has revolutionized the solar cell industry because of their flexible architecture and rapidly increased efficiency. Tuning the dielectric constant and charge separation are the main objectives in designing a photovoltaic device that can be explored using the two-dimensional perovskite family. Thus, revisiting the fundamental properties of perovskite crystals could reveal further possibilities for recognizing these improvements toward device functionality. In this context, this review discusses the material properties of two-dimensional halide perovskites and related optoelectronic devices, aiming particularly for solar cell applications.
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Lee PH, Wu TT, Tian KY, Li CF, Hou CH, Shyue JJ, Lu CF, Huang YC, Su WF. Work-Function-Tunable Electron Transport Layer of Molecule-Capped Metal Oxide for a High-Efficiency and Stable p-i-n Perovskite Solar Cell. ACS APPLIED MATERIALS & INTERFACES 2020; 12:45936-45949. [PMID: 32917088 DOI: 10.1021/acsami.0c10717] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The composite electron transporting layer (ETL) of metal oxide with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) prevents perovskite from metal electrode erosion and increases p-i-n perovskite solar cell (PVSC) stability. Although the oxide exhibits protective function, an additional work function modifier is still needed for good device performance. Usually, complicated multistep synthesis is employed to have a highly crystalline film that increases manufacturing cost and inhibits scalability. We report a facile synthesis of a novel organic-molecule-capped metal oxide nanoparticle film for the composite ETL. The nanoparticle film not only has a dual function of electron transport and protection but also exhibits work function tunability. Solvothermal-prepared SnO2 nanoparticles are capped with tetrabutylammonium hydroxide (TBAOH) through ligand exchange. The resulting TBAOH-SnO2 nanoparticles disperse well in ethanol and form a uniform film on PCBM. The power conversion efficiency of the device dramatically increases from 14.91 to 18.77% using this layer because of reduced charge accumulation and aligned band structure. The PVSC thermal stability is significantly enhanced by adopting this layer, which prevents migration of I- and Ag. The ligand exchange method extends to other metal oxides, such as TiO2, ITO, and CeO2, demonstrating its broad applicability. These results provide a cornerstone for large-scale manufacture of high-performance and stable PVSCs.
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Affiliation(s)
- Pei-Huan Lee
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Ting-Tzu Wu
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Kuo-Yu Tian
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Chia-Feng Li
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
| | - Cheng-Hung Hou
- Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
| | - Jing-Jong Shyue
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
- Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
| | - Chun-Fu Lu
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Yu-Ching Huang
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
| | - Wei-Fang Su
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
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8
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Kumar A, Bansode U, Ogale S, Rahman A. Understanding the thermal degradation mechanism of perovskite solar cells via dielectric and noise measurements. NANOTECHNOLOGY 2020; 31:365403. [PMID: 32470953 DOI: 10.1088/1361-6528/ab97d4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Long term stability is a major obstacle to the success of perovskite solar cell (PSC) photovoltaic technology. PSC performance deteriorates significantly in the presence of humidity, oxygen and exposure to UV light and heat. Here the change in charge transport properties of PSC with temperature and the associated significant drop in device performance at high temperature have been investigated. The latter is shown to be primarily due to an increase in charge carrier recombination, which impacts the open-circuit voltage. To understand the pathway of temperature-induced degradation, low-frequency 1/f noise characteristics, and the capacitance-frequency, as well as capacitance-voltage characteristics have been investigated under various conditions. The results show that at high operating temperature accumulation of ions and charge carriers at the interface increase the surface recombination. Aging experiments at different temperatures show high stability of PSCs up to temperature <70 °C, but a drastic, irreversible degradation occurs at higher temperature (≥80 °C). Low-frequency 1/f noise study revealed that the magnitude of normalized noise in degraded perovskite solar cells is four orders of magnitude higher than the pristine device. This study shows the power of low-frequency noise measurement technique as a highly sensitive non-invasive tool to study the degradation mechanism of PSCs.
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Affiliation(s)
- Ankit Kumar
- Department of Physics and Centre for Energy Science, Indian Institute of Science Education and Research (IISER)-Pune, Pune, Maharashtra 411008 India
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9
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Tisdale JT, Musicó B, Dryzhakov B, Koehler M, Mandrus D, Keppens V, Hu B. Optomechanical Effects Occurring in a Hybrid Metal-Halide Perovskite Single Crystal Based on Photoinduced Resonant Ultrasound Spectroscopy. J Phys Chem Lett 2020; 11:5407-5411. [PMID: 32530636 DOI: 10.1021/acs.jpclett.0c01472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This letter reports optomechanical effects occurring in a hybrid metal-halide perovskite single crystal (MAPbBr3) based on resonant ultrasound spectroscopy (RUS) measurements under continuous wave (CW) laser illumination. The optomechanical effects are a new phenomenon in hybrid perovskite single crystals where the elastic constant of a single crystal is measured by RUS probed under varying excitation conditions. Our studies show that applying a CW laser (405 nm) to the single-crystal face shifts the RUS peaks to higher frequencies by about 1-4% in the perovskite single crystal at room temperature. The light-induced shift of the RUS peaks can be observed only when photoexcitation is occurring, rather than during heating, by positioning the laser wavelength within the optical absorption spectrum. In contrast, positioning the laser wavelength outside of the optical absorption spectrum leads to an absence of RUS peak shifting. Clearly, the laser-light-induced RUS peak shifts shows that the crystal elastic moduli can be changed by photoexcitation, leading to an optomechanical phenomenon via excited states. Essentially, the observed optomechanical phenomenon reflects the fact that the mechanical properties can be optically changed through internal repulsive and attractive force constants by external photoexcitation in a hybrid perovskite single crystal.
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Affiliation(s)
- Jeremy T Tisdale
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-4545, United States
| | - Brianna Musicó
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-4545, United States
| | - Bogdan Dryzhakov
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-4545, United States
| | - Michael Koehler
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-4545, United States
| | - David Mandrus
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-4545, United States
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37821, United States
| | - Veerle Keppens
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-4545, United States
| | - Bin Hu
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-4545, United States
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10
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Qin J, Zhang J, Bai Y, Ma S, Wang M, Xu H, Loyd M, Zhan Y, Hou X, Hu B. Enabling Self-passivation by Attaching Small Grains on Surfaces of Large Grains toward High-Performance Perovskite LEDs. iScience 2019; 19:378-387. [PMID: 31419631 PMCID: PMC6706605 DOI: 10.1016/j.isci.2019.07.044] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 06/08/2019] [Accepted: 07/25/2019] [Indexed: 11/29/2022] Open
Abstract
This paper reports a new method to generate stable and high-brightness electroluminescence (EL) by subsequently growing large/small grains at micro/nano scales with the configuration of attaching small grains on the surfaces of large grains in perovskite (MAPbBr3) films by mixing two precursor solutions (PbBr2 + MABr and Pb(Ac)2·3H2O + MABr). Consequently, the small and large grains serve, respectively, as passivation agents and light-emitting centers, enabling self-passivation on the defects located on the surfaces of light-emitting large grains. Furthermore, the light-emitting states become linearly polarized with maximal polarization of 30.8%, demonstrating a very stable light emission (49,119 cd/m2 with EQE = 11.31%) and a lower turn-on bias (1.9 V) than the bandgap (2.25V) in the perovskite LEDs (ITO/PEDOT:PSS/MAPbBr3/TPBi[50 nm]/LiF[0.7 nm]/Ag). Therefore, mixing large/small grains with the configuration of attaching small grains on the surfaces of large grains by mixing two precursor solutions presents a new strategy to develop high-performance perovskite LEDs.
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Affiliation(s)
- Jiajun Qin
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA; State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
| | - Jia Zhang
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Yujie Bai
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
| | - Shengbo Ma
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Miaosheng Wang
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Hengxing Xu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Matthew Loyd
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Yiqiang Zhan
- Center for Micro Nano System, SIST, Fudan University, 200433 Shanghai, China
| | - Xiaoyuan Hou
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
| | - Bin Hu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA.
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11
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Hsu HC, Huang BC, Chin SC, Hsing CR, Nguyen DL, Schnedler M, Sankar R, Dunin-Borkowski RE, Wei CM, Chen CW, Ebert P, Chiu YP. Photodriven Dipole Reordering: Key to Carrier Separation in Metalorganic Halide Perovskites. ACS NANO 2019; 13:4402-4409. [PMID: 30916538 DOI: 10.1021/acsnano.8b09645] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Photodriven dipole reordering of the intercalated organic molecules in halide perovskites has been suggested to be a critical degree of freedom, potentially affecting physical properties, device performance, and stability of hybrid perovskite-based optoelectronic devices. However, thus far a direct atomically resolved dipole mapping under device operation condition, that is, illumination, is lacking. Here, we map simultaneously the molecule dipole orientation pattern and the electrostatic potential with atomic resolution using photoexcited cross-sectional scanning tunneling microscopy and spectroscopy. Our experimental observations demonstrate that a photodriven molecule dipole reordering, initiated by a photoexcited separation of electron-hole pairs in spatially displaced orbitals, leads to a fundamental reshaping of the potential landscape in halide perovskites, creating separate one-dimensional transport channels for holes and electrons. We anticipate that analogous light-induced polarization order transitions occur in bulk and are at the origin of the extraordinary efficiencies of organometal halide perovskite-based solar cells as well as could reconcile apparently contradictory materials' properties.
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Affiliation(s)
| | | | | | | | - Duc-Long Nguyen
- Department of Physics , National Central University , Taoyuan City 32001 , Taiwan
| | - Michael Schnedler
- Peter Grünberg Institut, Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - Raman Sankar
- Institute of Physics , Academia Sinica , Taipei 11529 , Taiwan
| | | | | | - Chun-Wei Chen
- Taiwan Consortium of Emergent Crystalline Materials , Ministry of Science and Technology , Taipei 10617 , Taiwan
| | - Philipp Ebert
- Peter Grünberg Institut, Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
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12
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Xie Y, Lu K, Duan J, Jiang Y, Hu L, Liu T, Zhou Y, Hu B. Enhancing Photovoltaic Performance of Inverted Planar Perovskite Solar Cells by Cobalt-Doped Nickel Oxide Hole Transport Layer. ACS APPLIED MATERIALS & INTERFACES 2018; 10:14153-14159. [PMID: 29620861 DOI: 10.1021/acsami.8b01683] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Electron and hole transport layers have critical impacts on the overall performance of perovskite solar cells (PSCs). Herein, for the first time, a solution-processed cobalt (Co)-doped NiO X film was fabricated as the hole transport layer in inverted planar PSCs, and the solar cells exhibit 18.6% power conversion efficiency. It has been found that an appropriate Co-doping can significantly adjust the work function and enhance electrical conductivity of the NiO X film. Capacitance-voltage ( C- V) spectra and time-resolved photoluminescence spectra indicate clearly that the charge accumulation becomes more pronounced in the Co-doped NiO X-based photovoltaic devices; it, as a consequence, prevents the nonradiative recombination at the interface between the Co-doped NiO X and the photoactive perovskite layers. Moreover, field-dependent photoluminescence measurements indicate that Co-doped NiO X-based devices can also effectively inhibit the radiative recombination process in the perovskite layer and finally facilitate the generation of photocurrent. Our work indicates that Co-doped NiO X film is an excellent candidate for high-performance inverted planar PSCs.
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Affiliation(s)
- Yulin Xie
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
- School of Electronic Information , Huanggang Normal University , Huanggang 438000 , China
| | - Kai Lu
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Jiashun Duan
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Youyu Jiang
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Lin Hu
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Tiefeng Liu
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Yinhua Zhou
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Bin Hu
- Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan 430074 , China
- Key Laboratory of Luminescence and Optical Information, Ministry of Education , Beijing Jiaotong University , Beijing 100044 , China
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
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