中国物理B ›› 2022, Vol. 31 ›› Issue (3): 38801-038801.doi: 10.1088/1674-1056/ac1fda

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Charge transfer modification of inverted planar perovskite solar cells by NiOx/Sr:NiOx bilayer hole transport layer

Qiaopeng Cui(崔翘鹏)1, Liang Zhao(赵亮)1, Xuewen Sun(孙学文)1, Qiannan Yao(姚倩楠)1, Sheng Huang(黄胜)1,†, Lei Zhu(朱磊)2, Yulong Zhao(赵宇龙)1, Jian Song(宋健)1,‡, and Yinghuai Qiang(强颖怀)1   

  1. 1 The Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China;
    2 Advanced Analysis&Computation Center, China University of Mining and Technology, Xuzhou 221116, China
  • 收稿日期:2021-07-16 修回日期:2021-08-18 接受日期:2021-08-22 出版日期:2022-02-22 发布日期:2022-02-14
  • 通讯作者: Sheng Huang, Jian Song E-mail:huangsheng@cumt.edu.cn;jsoong@cumt.edu.cn
  • 基金资助:
    This work was supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2021QN1110).

Charge transfer modification of inverted planar perovskite solar cells by NiOx/Sr:NiOx bilayer hole transport layer

Qiaopeng Cui(崔翘鹏)1, Liang Zhao(赵亮)1, Xuewen Sun(孙学文)1, Qiannan Yao(姚倩楠)1, Sheng Huang(黄胜)1,†, Lei Zhu(朱磊)2, Yulong Zhao(赵宇龙)1, Jian Song(宋健)1,‡, and Yinghuai Qiang(强颖怀)1   

  1. 1 The Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China;
    2 Advanced Analysis&Computation Center, China University of Mining and Technology, Xuzhou 221116, China
  • Received:2021-07-16 Revised:2021-08-18 Accepted:2021-08-22 Online:2022-02-22 Published:2022-02-14
  • Contact: Sheng Huang, Jian Song E-mail:huangsheng@cumt.edu.cn;jsoong@cumt.edu.cn
  • Supported by:
    This work was supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2021QN1110).

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摘要： Perovskite solar cells (PSCs) are the most promising commercial photoelectric conversion technology in the future. The planar p-i-n structure cells have advantages in negligible hysteresis, low temperature preparation and excellent stability. However, for inverted planar PSCs, the non-radiative recombination at the interface is an important reason that impedes the charge transfer and improvement of power conversion efficiency. Having a homogeneous, compact, and energy-level-matched charge transport layer is the key to reducing non-radiative recombination. In our study, NiO$_{x}$/Sr:NiO$_{x}$ bilayer hole transport layer (HTL) improves the holes transmission of NiO$_{x}$ based HTL, reduces the recombination in the interface between perovskite and HTL layer and improves the device performance. The bilayer HTL enhances the hole transfer by forming a driving force of an electric field and further improves $J_{\rm sc}$. As a result, the device has a power conversion efficiency of 18.44%, a short circuit current density of 22.81 mA$\cdot$cm$^{-2}$ and a fill factor of 0.80. Compared to the pristine PSCs, there are certain improvements of optical parameters. This method provides a new idea for the future design of novel hole transport layers and the development of high-performance solar cells.

关键词: perovskite solar cells, nickel oxide, Sr doping, bilayer hole transport layer

Abstract: Perovskite solar cells (PSCs) are the most promising commercial photoelectric conversion technology in the future. The planar p-i-n structure cells have advantages in negligible hysteresis, low temperature preparation and excellent stability. However, for inverted planar PSCs, the non-radiative recombination at the interface is an important reason that impedes the charge transfer and improvement of power conversion efficiency. Having a homogeneous, compact, and energy-level-matched charge transport layer is the key to reducing non-radiative recombination. In our study, NiO$_{x}$/Sr:NiO$_{x}$ bilayer hole transport layer (HTL) improves the holes transmission of NiO$_{x}$ based HTL, reduces the recombination in the interface between perovskite and HTL layer and improves the device performance. The bilayer HTL enhances the hole transfer by forming a driving force of an electric field and further improves $J_{\rm sc}$. As a result, the device has a power conversion efficiency of 18.44%, a short circuit current density of 22.81 mA$\cdot$cm$^{-2}$ and a fill factor of 0.80. Compared to the pristine PSCs, there are certain improvements of optical parameters. This method provides a new idea for the future design of novel hole transport layers and the development of high-performance solar cells.

Key words: perovskite solar cells, nickel oxide, Sr doping, bilayer hole transport layer

中图分类号:  (Solar cells (photovoltaics))

  • 88.40.H-
88.40.hj (Efficiency and performance of solar cells) 78.56.-a (Photoconduction and photovoltaic effects)