Highly efficient planar perovskite solar cells via acid-assisted surface passivation

Xin Zhang; Zejiao Shi; Haizhou Lu; Xiaoguo Li; Haoliang Wang; Sijian Yuan; Fengcai Liu; Yiyi Pan; Zhenhua Weng; Haijuan Zhang; Xiaolei Cui; Qi Liu; Chongyuan Li; Akrajas Ali Umar; Jiao Wang; Xiao-Chun Hang; Zhengyi Sun; Yiqiang Zhan

doi:10.1039/C9TA08042B

Highly efficient planar perovskite solar cells via acid-assisted surface passivation†

Xin Zhang,

‡^ab Zejiao Shi,‡^b Haizhou Lu,

^b Xiaoguo Li,^b Haoliang Wang,^b Sijian Yuan,^b Fengcai Liu,^b Yiyi Pan,^b Zhenhua Weng,^b Haijuan Zhang,^b Xiaolei Cui,^b Qi Liu,^c Chongyuan Li,^c Akrajas Ali Umar,

^d Jiao Wang,

^b Xiao-Chun Hang,^c Zhengyi Sun

^c and Yiqiang Zhan*^b

Author affiliations

* Corresponding authors

^a Academy for Engineering & Technology, Fudan University, Shanghai 200433, China

^b Center for Micro Nano Systems, School of Information Science and Technology (SIST), Fudan University, Shanghai 200433, China
E-mail: yqzhan@fudan.edu.cn

^c Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Centre for Advanced Materials (SICAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing 211800, China

^d Institute of Microengineering and Nanoelectronics, (IMEN), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Abstract

Low-temperature solution-processed SnO₂-based perovskite solar cells (PSCs) have achieved great progress recently, but they still suffer from a critical drawback due to the defects at the SnO₂/perovskite interface. Herein, we report a facile acetic acid post-treatment strategy to effectively passivate the surface defects. With an optimal concentration of acetic acid, the average power conversion efficiency (PCE) of the planar-type triple cation PSCs is greatly increased from 18.57% to 20.33%. The champion device shows a PCE of 20.56%. In addition, the universality of this passivation strategy is double confirmed by achieving an enhanced average PCE from 19.52% to 21.64% for sequential method deposited dual cation PSCs, with a leading PCE of 21.95%. Our work demonstrates an effective passivation strategy for SnO₂-based planar-type PSCs, which will benefit the development of high-efficiency PSCs.

Journal of Materials Chemistry A

Highly efficient planar perovskite solar cells via acid-assisted surface passivation†

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Highly efficient planar perovskite solar cells via acid-assisted surface passivation

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