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Vol. 12 (2020)

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

https://doi.org/10.1007/s40820-020-00517-y
Ningli Chen
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
Xiaohui Yi
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
Jing Zhuang
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
Yuanzhi Wei
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
Yanyan Zhang
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
Fuyi Wang
University of Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Shaokui Cao
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450000, People’s Republic of China
Cheng Li
Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China
Jizheng Wang
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

Corresponding Author: Jizheng Wang

jizheng@iccas.ac.cn

Nano-Micro Letters, Vol. 12 (2020), Article Number: 177

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.


Highlights：


1 Poly(propylene glycol) bis(2-aminopropyl ether) (PEA) additive is introduced into the perovskite solar cells to passivate both surface and grain boundary defects, and hence improve the device efficiency and stability.
2 MAPbI3 device with PEA exhibits significantly enhanced efficiency of 18.87%. (FAPbI3)1-x(MAPbBr3)x device with PEA exhibits enhanced efficiency of 21.60%.
3 The unsealed passivated device degrades only by 5% in PCE after being exposed to air (30 ± 5% relative humidity) for 30 days.

Keywords

Defects Grain boundaries Passivation Stability Perovskite solar cells
Chen, Ningli, Xiaohui Yi, Jing Zhuang, Yuanzhi Wei, Yanyan Zhang, Fuyi Wang, Shaokui Cao, Cheng Li, and Jizheng Wang. 2020. “An Efficient Trap Passivator for Perovskite Solar Cells: Poly(propylene Glycol) bis(2-Aminopropyl Ether)”. Nano-Micro Letters 12 (August):177. https://doi.org/10.1007/s40820-020-00517-y.
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