Optoelectronics Letters, Volume. 18, Issue 6, 338(2022)
Polymer passivation of defects in inorganic perovskite solar cells
Inorganic perovskite solar cells (IPSCs) have attained attention due to their excellent thermal and phase stability. In this work, we demonstrate a novel approach for fabricating IPSCs, using the strategies of interface passivation and anti-solvent before spin-coating perovskite. Poly(methyl methacrylate) (PMMA) and chlorobenzene (CB) are used as passivator and anti-solvent, respectively. The CB improves the perovskite crystal morphology. Meanwhile, PMMA passivates the defects between poly(3, 4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) and perovskite layer, thus increasing the short-circuit current. Excitingly, we find that PMMA benefits the grain boundaries (GBs) of perovskite, which makes it more humidity-resistant, increasing the stability of perovskite film. Especially, PMMA mitigates interfacial charge losses, and the devices based on CsPbI3-xBrx passivated by PMMA exhibit the power conversion efficiency (PCE) much higher than those based on pure CsPbI3-xBrx.
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ZHANG Meng, ZHANG Fanghui, SHI Kewang, ZHANG Wenxi, HUANG Jin, QIU Huimin. Polymer passivation of defects in inorganic perovskite solar cells[J]. Optoelectronics Letters, 2022, 18(6): 338
Received: Dec. 8, 2021
Accepted: Jan. 21, 2022
Published Online: Jan. 20, 2023
The Author Email: Fanghui ZHANG (zhangfanghui@sust.edu.cn)