An Efficient Trap Passivator for Perovskite Solar Cells: Poly(propylene glycol) bis(2-aminopropyl ether)
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Cite as Nano-Micro Lett. (2020) 12:177 Received: 15 May 2020 Accepted: 4 August 2020 © The Author(s) 2020
https://doi.org/10.1007/s40820-020-00517-y
An Efficient Trap Passivator for Perovskite Solar Cells: Poly(propylene glycol) bis(2‑aminopropyl ether) Ningli Chen1,2, Xiaohui Yi1,3, Jing Zhuang1,2, Yuanzhi Wei1,2, Yanyan Zhang4, Fuyi Wang2,4, Shaokui Cao5, Cheng Li3, Jizheng Wang1,2 * * Jizheng Wang, [email protected] 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 1
4
5
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 School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450000, People’s Republic of China
HIGHLIGHTS • 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. • 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%. • The unsealed passivated device degrades only by 5% in PCE after being exposed to air (30 ± 5% relative humidity) for 30 days.
ABSTRACT Perovskite solar cells (PSCs) are regarded as promis-
ing 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 longterm 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; Stability; Perovskite solar cells Vol.:(0123456789)
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1 Introduction Perovskite solar cells (PSCs) are attractive as next-generation photovoltaic devices due to their outstanding properties such as easy preparation, low cost, and high efficiency [1–5]. PSCs are first reported in 2009 [6], and since then, rapid progress has been made in improving their pe
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