中国物理B ›› 2022, Vol. 31 ›› Issue (3): 38804-038804.doi: 10.1088/1674-1056/ac464b

所属专题： SPECIAL TOPIC — Emerging photovoltaic materials and devices

• • 上一篇    

Reveal the large open-circuit voltage deficit of all-inorganicCsPbIBr2 perovskite solar cells

Ying Hu(胡颖)1,†, Jiaping Wang(王家平)1,†, Peng Zhao(赵鹏)1, Zhenhua Lin(林珍华)1,‡, Siyu Zhang(张思玉)1, Jie Su(苏杰)1, Miao Zhang(张苗)2, Jincheng Zhang(张进成)1,2, Jingjing Chang(常晶晶)1,2,§, and Yue Hao(郝跃)1   

  1. 1 State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, China;
    2 Advanced Interdisciplinary Research Center for Flexible Electronics, Xidian University, Xi'an 710071, China
  • 收稿日期:2021-11-30 修回日期:2021-12-20 接受日期:2021-12-24 出版日期:2022-02-22 发布日期:2022-03-01
  • 通讯作者: Zhenhua Lin, Jingjing Chang E-mail:zhlin@xidian.edu.cn;jjingchang@xidian.edu.cn
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China (Grant No. 52192610), the Key Research and Development Program of Shaanxi Province, China (Grant No. 2020GY-310), Youth Project of Natural Science Basic Research Program of Shaanxi Province, China (Grant No. 2021JQ-189), the Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (Grant No. 2020GXLH-Z-018), and the Fundamental Research Funds for the Central Universities, China.

Reveal the large open-circuit voltage deficit of all-inorganicCsPbIBr2 perovskite solar cells

Ying Hu(胡颖)1,†, Jiaping Wang(王家平)1,†, Peng Zhao(赵鹏)1, Zhenhua Lin(林珍华)1,‡, Siyu Zhang(张思玉)1, Jie Su(苏杰)1, Miao Zhang(张苗)2, Jincheng Zhang(张进成)1,2, Jingjing Chang(常晶晶)1,2,§, and Yue Hao(郝跃)1   

  1. 1 State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, China;
    2 Advanced Interdisciplinary Research Center for Flexible Electronics, Xidian University, Xi'an 710071, China
  • Received:2021-11-30 Revised:2021-12-20 Accepted:2021-12-24 Online:2022-02-22 Published:2022-03-01
  • Contact: Zhenhua Lin, Jingjing Chang E-mail:zhlin@xidian.edu.cn;jjingchang@xidian.edu.cn
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China (Grant No. 52192610), the Key Research and Development Program of Shaanxi Province, China (Grant No. 2020GY-310), Youth Project of Natural Science Basic Research Program of Shaanxi Province, China (Grant No. 2021JQ-189), the Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (Grant No. 2020GXLH-Z-018), and the Fundamental Research Funds for the Central Universities, China.

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摘要： Due to excellent thermal stability and optoelectronic properties, all-inorganic perovskite is one of the promising candidates to solve the thermal decomposition problem of conventional organic—inorganic hybrid perovskite solar cells (PSCs), but the larger voltage loss (Vloss) cannot be ignored, especially CsPbIBr2, which limits the improvement of efficiency. To reduce Vloss, one promising solution is the modification of the energy level alignment between the perovskite layer and adjacent charge transport layer (CTL), which can facilitate charge extraction and reduce carrier recombination rate at the perovskite/CTL interface. Therefore, the key issues of minimum Vloss and high efficiency of CsPbIBr2-based PSCs were studied in terms of the perovskite layer thickness, the effects of band offset of the CTL/perovskite layer, the doping concentration of the CTL, and the electrode work function in this study based on device simulations. The open-circuit voltage (Voc) is increased from 1.37 V to 1.52 V by replacing SnO2 with ZnO as the electron transport layer (ETL) due to more matching conduction band with the CsPbIBr2 layer.

关键词: all-inorganic perovskites, CsPbIBr2 solar cells, device simulation, voltage loss, Silvaco TCAD

Abstract: Due to excellent thermal stability and optoelectronic properties, all-inorganic perovskite is one of the promising candidates to solve the thermal decomposition problem of conventional organic—inorganic hybrid perovskite solar cells (PSCs), but the larger voltage loss (Vloss) cannot be ignored, especially CsPbIBr2, which limits the improvement of efficiency. To reduce Vloss, one promising solution is the modification of the energy level alignment between the perovskite layer and adjacent charge transport layer (CTL), which can facilitate charge extraction and reduce carrier recombination rate at the perovskite/CTL interface. Therefore, the key issues of minimum Vloss and high efficiency of CsPbIBr2-based PSCs were studied in terms of the perovskite layer thickness, the effects of band offset of the CTL/perovskite layer, the doping concentration of the CTL, and the electrode work function in this study based on device simulations. The open-circuit voltage (Voc) is increased from 1.37 V to 1.52 V by replacing SnO2 with ZnO as the electron transport layer (ETL) due to more matching conduction band with the CsPbIBr2 layer.

Key words: all-inorganic perovskites, CsPbIBr2 solar cells, device simulation, voltage loss, Silvaco TCAD

中图分类号:  (Solar cells (photovoltaics))

  • 88.40.H-
88.40.hj (Efficiency and performance of solar cells) 88.40.fc (Modeling and analysis)