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

doi:10.1088/1674-1056/ac1fda

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.

Keywords: perovskite solar cells nickel oxide Sr doping bilayer hole transport layer

Received: 16 July 2021
Revised: 18 August 2021
Accepted manuscript online: 22 August 2021

PACS:	88.40.H-	(Solar cells (photovoltaics))
	88.40.hj	(Efficiency and performance of solar cells)
	78.56.-a	(Photoconduction and photovoltaic effects)

Fund: This work was supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2021QN1110).

Corresponding Authors: Sheng Huang, Jian Song
E-mail: huangsheng@cumt.edu.cn;jsoong@cumt.edu.cn

Cite this article:

Qiaopeng Cui(崔翘鹏), Liang Zhao(赵亮), Xuewen Sun(孙学文), Qiannan Yao(姚倩楠), Sheng Huang(黄胜), Lei Zhu(朱磊), Yulong Zhao(赵宇龙), Jian Song(宋健), and Yinghuai Qiang(强颖怀) Charge transfer modification of inverted planar perovskite solar cells by NiO_x/Sr:NiO_x bilayer hole transport layer 2022 Chin. Phys. B 31 038801

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

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