An Efficient Trap Passivator for Perovskite Solar Cells: Poly(propylene glycol) bis(2-aminopropyl ether)

Ningli Chen; Xiaohui Yi; Jing Zhuang; Yuanzhi Wei; Yanyan Zhang; Fuyi Wang; Shaokui Cao; Cheng Li; Jizheng Wang

doi:10.1007/s40820-020-00517-y

An Efficient Trap Passivator for Perovskite Solar Cells: Poly(propylene glycol) bis(2-aminopropyl ether)

Nanomicro Lett. 2020 Aug 29;12(1):177. doi: 10.1007/s40820-020-00517-y.

Authors

Ningli Chen^{1

2}, Xiaohui Yi^{1

3}, Jing Zhuang^{1

2}, Yuanzhi Wei^{1

2}, Yanyan Zhang⁴, Fuyi Wang^{2

4}, Shaokui Cao⁵, Cheng Li³, Jizheng Wang^{6

7}

Affiliations

¹ CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
² University of Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
³ Department of Physics, Xiamen University, Xiamen, 361005, People's Republic of China.
⁴ CAS Key Laboratory of Analytical Chemistry for Living Biosystems, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
⁵ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450000, People's Republic of China.
⁶ CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, People's Republic of China. jizheng@iccas.ac.cn.
⁷ University of Chinese Academy of Sciences, Beijing, 100190, People's Republic of China. jizheng@iccas.ac.cn.

Abstract

Perovskite solar cells (PSCs) are regarded as promising candidates for future renewable energy production. High-density defects in the perovskite films, however, lead to unsatisfactory device performances. Here, poly(propylene glycol) bis(2-aminopropyl ether) (PEA) additive is utilized to passivate the trap states in perovskite. The PEA molecules chemically interact with lead ions in perovskite, considerably passivate surface and bulk defects, which is in favor of charge transfer and extraction. Furthermore, the PEA additive can efficiently block moisture and oxygen to prolong the device lifetime. As a result, PEA-treated MAPbI₃ (MA: CH₃NH₃) solar cells show increased power conversion efficiency (PCE) (from 17.18 to 18.87%) and good long-term stability. When PEA is introduced to (FAPbI₃)_1-x(MAPbBr₃)_x (FA: HC(NH₂)₂) solar cells, the PCE is enhanced from 19.66 to 21.60%. For both perovskites, their severe device hysteresis is efficiently relieved by PEA.

Keywords: Defects; Grain boundaries; Passivation; Perovskite solar cells; Stability.