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Zhang C, Uchikoshi T, Ishigaki T. Effect of crystalline orientation on photocatalytic performance for Nb-doped TiO2 nanoparticles. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.09.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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2
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Park SY, Han S, Kim Y, Jung S, Kim DH, Han GS, Jung HS. Ultimate Charge Extraction of Monolayer PbS Quantum Dot for Observation of Multiple Exciton Generation. Chemphyschem 2019; 20:2657-2661. [PMID: 31410971 DOI: 10.1002/cphc.201900381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 07/17/2019] [Indexed: 11/06/2022]
Abstract
Multiple exciton generation (MEG) has great potential to improve the Shockley-Queisser (S-Q) efficiency limitation for colloidal quantum dot (CQD) solar cells. However, MEG has rarely been observed in CQD solar cells because of the loss of carriers through the transport mechanism between adjacent QDs. Herein, we demonstrate that excess charge carriers produced via MEG can be efficiently extracted using monolayer PbS QDs. The monolayer PbS QDs solar cells exhibit α=1 in the light intensity dependence of the short-circuit current density Jsc (Jsc ∝Iα ) and an internal quantum efficiency (IQE) value of 100 % at 2.95 eV because of their very short charge extraction path. In addition, the measured MEG threshold is 2.23 times the bandgap energy (Eg ), which is the lowest value in PbS QD solar cells. We believe that this approach can provide a simple method to find suitable CQD materials and design interface engineering for MEG.
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Affiliation(s)
- So-Yeon Park
- School of Advanced Materials & Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Sehoon Han
- School of Advanced Materials & Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Younghoon Kim
- Convergence Research Center for Solar Energy Convergence Research Institute, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu, 72988, Republic of Korea
| | - Sohee Jung
- Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Dong Hoe Kim
- Department of Nanotechnology & Advanced Materials Engineering Sejong University, Seoul, 05006, Republic of Korea
| | - Gill Sang Han
- School of Advanced Materials & Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Hyun Suk Jung
- School of Advanced Materials & Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
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3
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Efficient electrochromic performance of anatase TiO2 thin films prepared by nebulized spray deposition method. J Solid State Electrochem 2018. [DOI: 10.1007/s10008-018-3888-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Novel Visible-Light-Driven Photocatalyst Co3O4/FeWO4 for Efficient Decomposition of Organic Pollutants. J CLUST SCI 2017. [DOI: 10.1007/s10876-017-1302-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Yeon DH, Mohanty BC, Lee CY, Lee SM, Cho YS. High-Efficiency Double Absorber PbS/CdS Heterojunction Solar Cells by Enhanced Charge Collection Using a ZnO Nanorod Array. ACS OMEGA 2017; 2:4894-4899. [PMID: 31457768 PMCID: PMC6641925 DOI: 10.1021/acsomega.7b00999] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Accepted: 08/11/2017] [Indexed: 05/03/2023]
Abstract
The device architecture of solar cells remains critical in achieving high photoconversion efficiency while affordable and scalable routes are being explored. Here, we demonstrate a scalable, low cost, and less toxic synthesis route for the fabrication of PbS/CdS thin-film solar cells with efficiencies as high as ∼5.59%, which is the highest efficiency obtained so far for the PbS-based solar cells not involving quantum dots. The devices use a stack of two band-aligned junctions that facilitates absorption of a wider range of the solar spectrum and an architectural modification of the electron-accepting electrode assembly consisting of a very thin CdS layer (∼10 nm) supported by vertically aligned ZnO nanorods on a ∼50 nm thick ZnO underlayer. Compared to a planar electrode of a 50 nm thick CdS film, the modified electrode assembly enhanced the efficiency by ∼39% primarily due to a significantly higher photon absorption in the PbS layer, as revealed by a detailed three-dimensional finite difference time-domain optoelectronic modeling of the device.
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Affiliation(s)
- Deuk Ho Yeon
- Department
of Materials Science and Engineering, Yonsei
University, Seoul 03722, Korea
- R&D
Center, LG Display Co., Ltd., Paju-si 10845, Gyeonggi-do, Korea
| | | | - Che Yoon Lee
- Department
of Materials Science and Engineering, Yonsei
University, Seoul 03722, Korea
| | - Seung Min Lee
- Department
of Materials Science and Engineering, Yonsei
University, Seoul 03722, Korea
| | - Yong Soo Cho
- Department
of Materials Science and Engineering, Yonsei
University, Seoul 03722, Korea
- E-mail: .
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Wang Y, Liu X, Li Z, Cao Y, Li Y, Liu X, Jia S, Zhao Y. Ordered Single-Crystalline Anatase TiO 2 Nanorod Clusters Planted on Graphene for Fast Charge Transfer in Photoelectrochemical Solar Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1700793. [PMID: 28558166 DOI: 10.1002/smll.201700793] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 04/18/2017] [Indexed: 06/07/2023]
Abstract
Achieving efficient charge transport is a great challenge in nanostructured TiO2 -electrode-based photoelectrochemical cells. Inspired by excellent directional charge transport and the well-known electroconductibility of 1D anatase TiO2 nanostructured materials and graphene, respectively, planting ordered, single-crystalline anatase TiO2 nanorod clusters on graphene sheets (rGO/ATRCs) via a facial one-pot solvothermal method is reported. The hierarchical rGO/ATRCs nanostructure can serve as an efficient light-harvesting electrode for dye-sensitized solar cells. In addition, the obtained high-crystallinity anatase TiO2 nanorods in rGO/ATRCs possess a lower density of trap states, thus facilitating diffusion-driven charge transport and suppressing electron recombination. Moreover, the novel architecture significantly enhances the trap-free charge diffusion coefficient, which contributes to superior electron mobility properties. By virtue of more efficient charge transport and higher energy conversion efficiency, the rGO/ATRCs developed in this work show significant advantages over conventional rGO-TiO2 nanoparticle counterparts in photoelectrochemical cells.
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Affiliation(s)
- Yang Wang
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Xueqin Liu
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
| | - Zhen Li
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
| | - Ya Cao
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
| | - Yinchang Li
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
| | - Xupo Liu
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
| | - Songru Jia
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
| | - Yanli Zhao
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
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Han GS, Shim HW, Lee S, Duff ML, Lee JK. Low-Temperature Modification of ZnO Nanoparticles Film for Electron-Transport Layers in Perovskite Solar Cells. CHEMSUSCHEM 2017; 10:2425-2430. [PMID: 28419730 DOI: 10.1002/cssc.201700029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/29/2017] [Indexed: 06/07/2023]
Abstract
An electron-transport layer (ETL) that selectively collects photogenerated electrons is an important constituent of halide perovskite solar cells (PSCs). Although TiO2 films are widely used as ETL of PSCs, the processing of TiO2 films with high electron mobility requires high-temperature annealing and TiO2 dissociates the perovskite layer through a photocatalytic reaction. Here, we report an effective surface-modification method of a room-temperature processed ZnO nanoparticles (NPs) layer as an alternative to the TiO2 ETL. A combination of simple UV exposure and nitric acid treatment effectively removes the hydroxyl group and passivates surface defects in ZnO NPs. The surface modification of ZnO NPs increases the power conversion efficiency (PCE) of PSCs to 14 % and decreases the aging of PSCs under light soaking. These results suggest that the surface-modified ZnO film can be a good ETL of PSCs and provide a path toward low-temperature processing of efficient and stable PSCs that are compatible with flexible electronics.
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Affiliation(s)
- Gill Sang Han
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, PA, 15261, USA
| | - Hyun-Woo Shim
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, PA, 15261, USA
| | - Seongha Lee
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, PA, 15261, USA
| | - Matthew L Duff
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, PA, 15261, USA
| | - Jung-Kun Lee
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, PA, 15261, USA
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Tan F, Wang Z, Qu S, Cao D, Liu K, Jiang Q, Yang Y, Pang S, Zhang W, Lei Y, Wang Z. A CdSe thin film: a versatile buffer layer for improving the performance of TiO2 nanorod array:PbS quantum dot solar cells. NANOSCALE 2016; 8:10198-204. [PMID: 27124650 DOI: 10.1039/c6nr01658h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
To fully utilize the multiple exciton generation effects in quantum dots and improve the overall efficiency of the corresponding photovoltaic devices, nanostructuralizing the electron conducting layer turns out to be a feasible strategy. Herein, PbS quantum dot solar cells were fabricated on the basis of morphologically optimized TiO2 nanorod arrays. By inserting a thin layer of CdSe quantum dots into the interface of TiO2 and PbS, a dramatic enhancement in the power conversion efficiency from 4.2% to 5.2% was realized and the resulting efficiency is one of the highest values for quantum dot solar cells based on nanostructuralized buffer layers. The constructed double heterojunction with a cascade type-II energy level alignment is beneficial for promoting photogenerated charge separation and reducing charge recombination, thereby responsible for the performance improvement, as revealed by steady-state analyses as well as ultra-fast photoluminescence and photovoltage decays. Thus this paper provides a good buffer layer to the community of quantum dot solar cells.
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Affiliation(s)
- Furui Tan
- Key Laboratory of Photovoltaic Materials, Department of Physics and Electronics, Henan University, Kaifeng 475004, PR China.
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Han GS, Chung HS, Kim DH, Kim BJ, Lee JW, Park NG, Cho IS, Lee JK, Lee S, Jung HS. Epitaxial 1D electron transport layers for high-performance perovskite solar cells. NANOSCALE 2015; 7:15284-15290. [PMID: 26324759 DOI: 10.1039/c5nr03476k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate high-performance perovskite solar cells with excellent electron transport properties using a one-dimensional (1D) electron transport layer (ETL). The 1D array-based ETL is comprised of 1D SnO2 nanowires (NWs) array grown on a F:SnO2 transparent conducting oxide substrate and rutile TiO2 nanoshells epitaxially grown on the surface of the 1D SnO2 NWs. The optimized devices show more than 95% internal quantum yield at 750 nm, and a power conversion efficiency (PCE) of 14.2%. The high quantum yield is attributed to dramatically enhanced electron transport in the epitaxial TiO2 layer, compared to that in conventional nanoparticle-based mesoporous TiO2 (mp-TiO2) layers. In addition, the open space in the 1D array-based ETL increases the prevalence of uniform TiO2/perovskite junctions, leading to reproducible device performance with a high fill factor. This work offers a method to achieve reproducible, high-efficiency perovskite solar cells with high-speed electron transport.
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Affiliation(s)
- Gill Sang Han
- School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
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