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Spray Coated Colloidal Quantum Dot Films for Broadband Photodetectors. NANOMATERIALS 2019; 9:nano9121738. [PMID: 31817681 PMCID: PMC6955664 DOI: 10.3390/nano9121738] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 11/23/2019] [Accepted: 12/04/2019] [Indexed: 11/17/2022]
Abstract
A technique for scalable spray coating of colloidal CdSeTe quantum dots (QDs) for photovoltaics and photodetector applications is presented. A mixture solvent with water and ethanol was introduced to enhance the adhesive force between QDs and the substrate interface. The performance of the detector reached the highest values with 40 spray coating cycles of QD deposition. The photodetectors without bias voltage showed broadband response in the wavelength range of 300–800 nm, and high responsivity of 15 mA/W, detectivity of more than 1011 Jones and rise time of 0.04 s. A large size QD-logo pattern film (10 × 10 cm2) prepared by the spray coating process displayed excellent uniformity of thickness and absorbance. The large area detectors (the active area 1 cm2) showed almost the same performance as the typical laboratory-size ones (the active area 0.1 cm2). Our study demonstrates that the spray coating is a very promising film fabrication technology for the industrial-scale production of optoelectronic devices.
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Du X, Li W, Zhao L, He X, Chen H, Fang W. Electron transport improvement in CdSe-quantum dot solar cells using ZnO nanowires in nanoporous TiO2 formed by foam template. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2018.10.054] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Shen T, Li B, Zheng K, Pullerits T, Cao G, Tian J. Surface Engineering of Quantum Dots for Remarkably High Detectivity Photodetectors. J Phys Chem Lett 2018; 9:3285-3294. [PMID: 29862824 DOI: 10.1021/acs.jpclett.8b01255] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Ternary alloyed CdSe xTe1- x colloidal QDs trap-passivated by iodide-based ligands (TBAI) are developed as building blocks for UV-NIR photodetectors. Both the few surface traps and high loading of QDs are obtained by in situ ligand exchange with TBAI. The device is sensitive to a broad wavelength range covering the UV-NIR region (300-850 nm), showing an excellent photoresponsivity of 53 mA/W, a fast response time of ≪0.02s, and remarkably high detectivity values of 8 × 1013 Jones at 450 nm and 1 × 1013 Jones at 800 nm without an external bias voltage. Such performance is superior to what has been reported earlier for QD-based photodetectors. The photodetector exhibits excellent stability, keeping 98% of photoelectric responsivity after 2 months of illumination in air even without encapsulation. In addition, the semitransparent device is successfully fabricated using a Ag nanowires/polyimide transparent substrate. Such self-powered photodetectors with fast response speed and a stable, broad-band response are expected to function under a broad range of environmental conditions.
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Affiliation(s)
- Ting Shen
- Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China
| | - Bo Li
- Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
- Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark
| | - Tönu Pullerits
- Department of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden
| | - Guozhong Cao
- Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China
- Department of Materials and Engineering , University of Washington , Seattle , Washington 98195-2120 , United States
| | - Jianjun Tian
- Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China
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Esparza D, Lopez-Luke T, Oliva J, Cerdán-Pasarán A, Martínez-Benítez A, Mora-Seró I, Rosa EDL. Enhancement of Efficiency in Quantum Dot Sensitized Solar Cells Based on CdS/CdSe/CdSeTe Heterostructure by Improving the Light Absorption in the VIS-NIR Region. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.07.060] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ren Z, Yu J, Pan Z, Wang J, Zhong X. Inorganic Ligand Thiosulfate-Capped Quantum Dots for Efficient Quantum Dot Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:18936-18944. [PMID: 28508629 DOI: 10.1021/acsami.7b03715] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The insulating nature of organic ligands containing long hydrocarbon tails brings forward serious limitations for presynthesized quantum dots (QDs) in photovoltaic applications. Replacing the initial organic hydrocarbon chain ligands with simple, cheap, and small inorganic ligands is regarded as an efficient strategy for improving the performance of the resulting photovoltaic devices. Herein, thiosulfate (S2O32-), and sulfide (S2-) were employed as ligand-exchange reagents to get access to the inorganic ligand S2O32-- and S2--capped CdSe QDs. The obtained inorganic ligand-capped QDs, together with the initial oleylamine-capped QDs, were used as light-absorbing materials in the construction of quantum dot sensitized solar cells (QDSCs). Photovoltaic results indicate that thiosulfate-capped QDs give excellent power conversion efficiency (PCE) of 6.11% under the illumination of full one sun, which is remarkably higher than those of sulfide- (3.36%) and OAm-capped QDs (0.84%) and is comparable to the state-of-the-art value based on mercaptocarboxylic acid capped QDs. Photoluminescence (PL) decay characterization demonstrates that thiosulfate-based QDSCs have a much-faster electron injection rate from QD to TiO2 substrate in comparison with those of sulfide- and OAm-based QDSCs. Electrochemical impedance spectroscopy (EIS) results indicate that higher charge-recombination resistance between potoanode and eletrolyte interfaces were observed in the thiosulfate-based cells. To the best of our knowledge, this is the first application of thiosulfate-capped QDs in the fabrication of efficient QDSCs. This will lend a new perspective to boosting the performance of QDSCs furthermore.
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Affiliation(s)
- Zhenwei Ren
- Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
- College of Materials and Energy, South China Agricultural University , 483 Wushan Road, Guangzhou 510642, China
| | - Juan Yu
- Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
| | - Zhenxiao Pan
- College of Materials and Energy, South China Agricultural University , 483 Wushan Road, Guangzhou 510642, China
| | - Jizheng Wang
- Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences , Beijing 100190, China
| | - Xinhua Zhong
- Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
- College of Materials and Energy, South China Agricultural University , 483 Wushan Road, Guangzhou 510642, China
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Luo S, Shen H, Zhang Y, Li J, Oron D, Lin H. Inhibition of charge transfer and recombination processes in CdS/N719 co-sensitized solar cell with high conversion efficiency. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.01.055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Du X, Chen Z, Liu F, Zeng Q, Jin G, Li F, Yao D, Yang B. Improvement in Open-Circuit Voltage of Thin Film Solar Cells from Aqueous Nanocrystals by Interface Engineering. ACS APPLIED MATERIALS & INTERFACES 2016; 8:900-907. [PMID: 26670604 DOI: 10.1021/acsami.5b10374] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, improved solar cells from aqueous CdTe NCs is achieved by replacing evaporated MoOx with spiro-OMeTAD as a hole transfer layer. The increased Voc and Jsc can be attributed to interfacial dipole effect and reduced back recombination loss, respectively. A high PCE of 6.56% for solar cells from aqueous NCs is obtained by optimizing the microstructure further.
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Affiliation(s)
- Xiaohang Du
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Zhaolai Chen
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Fangyuan Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Qingsen Zeng
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Gan Jin
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Fenghong Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Dong Yao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
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