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2. Minimizing the Ohmic Resistance of Wide-Bandgap Perovskite for Semitransparent and Tandem Solar Cells.

Author

Haoran Ye, Weiquan Xu, Fei Tang, Bohao Yu, Cuiling Zhang, Nanxi Ma, Feiping Lu, Yuzhao Yang, Kai Shen, Weiyuan Duan, Lambertz, Andreas, Kaining Ding, and Yaohua Mai

Subjects
PHOTOVOLTAIC power systems, SOLAR cells, OHMIC resistance, SILICON solar cells, OHMIC contacts, PEROVSKITE, CHARGE exchange
Abstract

To overcome the efficiency limit of perovskite single-junction solar cells, it is vital to develop various types of tandem solar cells. Especially, wide-bandgap (WBG) perovskite solar cells (PSCs) have played an important role in high-efficiency tandem solar cells. Herein, an indium zinc oxide-based interfacial structure is developed to improve the performance of a WBG PSC and used as the transparent electrode for semitransparent (ST) PSCs. This approach minimizes ohmic contact between the electron-transport layer and metallic electrode, which also accelerates electron transfer and suppresses trap-assisted carrier recombination. As a result, the WBG PSC (1.71 eV) shows the best power conversion efficiency of 19.26% and improves operational stability. When the optimized ST-PSC is used as the ST-top cell, perovskite/CdTe four-terminal and perovskite/silicon (doubleside polished) two-terminal tandem solar cells achieve a maximum efficiency of 22.59% and 26.34%, respectively. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Interface Recombination of Cu 2 ZnSnS 4 Solar Cells Leveraged by High Carrier Density and Interface Defects

Author

Jialiang Huang, Jianjun Li, Takeaki Sakurai, Chao Chen, Chang Yan, Xin Cui, Yanchan Huang, Xiaojing Hao, Kaiwen Sun, Yaohua Mai, and Hitoshi Tampo

Subjects
Charge-carrier density, Band bending, Materials science, Interface (Java), business.industry, Energy Engineering and Power Technology, Optoelectronics, Electrical and Electronic Engineering, business, Atomic and Molecular Physics, and Optics, Recombination, Electronic, Optical and Magnetic Materials
Published
2021

10. Europium (II)‐Doped All‐Inorganic CsPbBr 3 Perovskite Solar Cells with Carbon Electrodes

Author

Wentao Yang, Guowei Yang, Santhosh Kumar Karunakaran, Sijie Ge, Gowri Manohari Arumugam, Xianzhong Lin, Yaohua Mai, and Saqib Nawaz Khan

Subjects
Materials science, chemistry, Electrode, Doping, Inorganic chemistry, Energy Engineering and Power Technology, chemistry.chemical_element, Electrical and Electronic Engineering, Europium, Carbon, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Perovskite (structure)
Published
2020

11. Crystallographic Orientation Control of 1D Sb 2 Se 3 Nanorod Arrays for Photovoltaic Application by In Situ Back‐Contact Engineering

Author

Lin Yang, Zhiqiang Li, Tao Liu, Xiaoyang Liang, Ruud E. I. Schropp, Chunsheng Guo, Kai Shen, Yaohua Mai, Yufan Liu, and Dengyuan Song

Subjects
In situ, Orientation control, Materials science, business.industry, Photovoltaic system, Energy Engineering and Power Technology, Optoelectronics, Nanorod, Electrical and Electronic Engineering, business, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Published
2020

12. 1D/3D Alloying Induced Phase Transition in Light Absorbers for Highly Efficient Sb 2 Se 3 Solar Cells

Author

Yufan Liu, Yaohua Mai, Ruud E. I. Schropp, Zhiqiang Li, Weidong Lai, Tao Liu, Xiaoyang Liang, Dengyuan Song, Chunsheng Guo, and Lin Yang

Subjects
Imagination, Phase transition, Thesaurus (information retrieval), Chemical substance, Materials science, business.industry, media_common.quotation_subject, Energy Engineering and Power Technology, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Search engine, Optoelectronics, Thin film solar cell, Electrical and Electronic Engineering, Light absorber, business, Science, technology and society, media_common
Published
2020

13. Polyfluorene Copolymers as High‐Performance Hole‐Transport Materials for Inverted Perovskite Solar Cells

Author

Fei Guo, Chaohui Li, Chang Peng, Shudi Qiu, Yaohua Mai, Jiang You, Jinlong Hu, Wenxin He, and Xianhu Liu

Subjects
Polyfluorene, chemistry.chemical_compound, Materials science, Chemical engineering, chemistry, Copolymer, Energy Engineering and Power Technology, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Perovskite (structure)
Published
2019

15. Restraining the Band Fluctuation of CBD-Zn(O,S) Layer: Modifying the Hetero-Junction Interface for High Performance Cu2 ZnSnSe4 Solar Cells With Cd-Free Buffer Layer (Solar RRL 10∕2017)

Author

Jianjun Li, Xiaoru Liu, Wei Liu, Li Wu, Binghui Ge, Shuping Lin, Shoushuai Gao, Zhiqiang Zhou, Fangfang Liu, Yun Sun, Jianping Ao, Hongbing Zhu, Yaohua Mai, and Yi Zhang

Subjects
Energy Engineering and Power Technology, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Published
2017

16. Crystallization Dependent Stability of Perovskite Solar Cells With Different Hole Transporting Layers

Author

Yaohua Mai, Cuiling Zhang, Jiandong Fan, Wenzhe Li, and Chong Liu

Subjects
Work (thermodynamics), Materials science, Kinetics, Photovoltaic system, Energy Engineering and Power Technology, Mineralogy, 02 engineering and technology, Conductivity, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, law.invention, Atmosphere, PEDOT:PSS, Chemical engineering, law, Electrical and Electronic Engineering, Crystallization, 0210 nano-technology, Perovskite (structure)
Abstract

In this work, the crystallization dependent stability of perovskite solar cells with different hole transporting layers (HTLs), i.e., PEDOT: PSS and Cu:NiOx is studied. The evolution of photovoltaic performance over time is demonstrated to be associated with the variety of crystallized quality and conductivity of as-prepared films. The potential mechanisms behind the device are also provided in view of the microscopic kinetics of crystallization combined with the varied conductivity of HTLs induced by the ambient atmosphere.

Published
2017

17. Restraining the Band Fluctuation of CBD-Zn(O,S) Layer: Modifying the Hetero-Junction Interface for High Performance Cu2 ZnSnSe4 Solar Cells With Cd-Free Buffer Layer

Author

Jianping Ao, Yi Zhang, Xiaoru Liu, Shuping Lin, Shoushuai Gao, Binghui Ge, Hongbing Zhu, Wei Liu, Fangfang Liu, Zhiqiang Zhou, Yun Sun, Li Wu, Yaohua Mai, and Jianjun Li

Subjects
010302 applied physics, Materials science, Chalcopyrite, Annealing (metallurgy), Energy conversion efficiency, Energy Engineering and Power Technology, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, Buffer (optical fiber), Electronic, Optical and Magnetic Materials, Chemical engineering, visual_art, 0103 physical sciences, visual_art.visual_art_medium, engineering, Electronic engineering, Thin film solar cell, Charge carrier, Kesterite, Electrical and Electronic Engineering, 0210 nano-technology, S-layer
Abstract

Zn(O,S) film is a promising low-cost and environment-friendly Cd-free buffer layer for chalcopyrite and kesterite thin film solar cells. However, the devices with Zn(O,S) buffer layer usually suffer from poor interface performance, resulting in a much lower efficiency, especially for kesterite solar cells. Here, the band fluctuation caused by ZnO secondary phase in Zn(O,S) layer is identified as the main reason deteriorating the device performance. By a concentrated ammonium etching and subsequent soft annealing treatment, the detrimental ZnO and Zn(OH)2 secondary phases are eliminated from the Zn(O,S) layer and the hetero-junction performance is improved significantly. Consequently, the power conversion efficiency of the Zn(O,S)/CZTSe solar cells was improved from 1.17% to a favorable value of 7.2%. Temperature dependent J–V properties reveal a defect level assisted charge carrier transport mechanism across the Zn(O,S)/CZTSe interface. These encouraging results imply that Zn(O,S) buffer layer is a promising substitution for toxic CdS in future manufacturing of high performance thin film solar cells.

Published
2017

18. Polymer Thin Films for Anti-Reflection and Passivation on the Front Surface of Interdigitated Back Contact c-Si Solar Cell (Solar RRL 7∕2017)

Author

Feng Li, Ying Xu, Bingbing Chen, Yanjiao Shen, Jianxin Guo, Ziqian Wang, Kunpeng Ge, Jianhui Chen, and Yaohua Mai

Subjects
Surface (mathematics), Materials science, Passivation, business.industry, Front (oceanography), Energy Engineering and Power Technology, Atomic and Molecular Physics, and Optics, Polymer solar cell, Electronic, Optical and Magnetic Materials, law.invention, Reflection (mathematics), law, Solar cell, Optoelectronics, Electrical and Electronic Engineering, business, Polymer thin films
Published
2017

19. Polymer Thin Films for Anti-Reflection and Passivation on the Front Surface of Interdigitated Back Contact c-Si Solar Cell

Author

Yaohua Mai, Yanjiao Shen, Bingbing Chen, Jianxin Guo, Ying Xu, Kunpeng Ge, Jianhui Chen, Ziqian Wang, and Feng Li

Subjects
010302 applied physics, Materials science, Passivation, business.industry, Open-circuit voltage, Energy Engineering and Power Technology, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, Polymer solar cell, Electronic, Optical and Magnetic Materials, law.invention, Anti-reflective coating, law, 0103 physical sciences, Solar cell, Electronic engineering, Optoelectronics, Wafer, Electrical and Electronic Engineering, Thin film, 0210 nano-technology, business, Layer (electronics)
Abstract

In this work, a polymer thin film, polystyrenesulfonate (PSS), is employed in interdigitated back contact (IBC) solar cells as an anti-reflection (AR) coating and front surface passivation (SP) layer. It is found that PSS thin film is highly transparent and possesses a refraction index of about 1.5, and thus functions well as AR coating for Si wafer-based solar cells. An effective minority carrier lifetime of 2.3 ms is obtained on 1–5 Ω · cm n-type crystalline Si wafer with both sides symmetrically coated by PSS thin film, proving a good Si surface passivation by this polymer. An increase in power conversion efficiency is obtained when 150 nm-thick PSS thin film is coated on the front surface of IBC solar cells without any AR/SP layers, resulted from the increased short circuit current density and open circuit voltage. This work opens up a new approach using organic polymer thin film deposited with low temperature and vacuum-free technique as AR/SP multifunctional layer in Si solar cells.

Published
2017

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