Internal Interactions between Mixed Bulky Organic Cations on Passivating Defects in Perovskite Solar Cells

In perovskite solar cells (PSCs), bulky organic cation halide salt additions play a significant role in suppressing nonradiative recombination by passivating intrinsic defects in perovskites. Herein, a passivation treatment is developed by applying mixed bulky cations [guanidinium cation (GA+) and p...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2022-03, Vol.14 (9), p.11200-11210
Main Authors: Ma, Yuhui, Zhang, Ling, Xu, Yao, Hu, Ruiyuan, Liu, Wei, Du, Ming, Chu, Liang, Zhang, Jian, Li, Xing’ao, Xia, Ruidong, Huang, Wei
Format: Article
Language:English
Subjects:
Energy, Environmental, and Catalysis Applications
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Summary:In perovskite solar cells (PSCs), bulky organic cation halide salt additions play a significant role in suppressing nonradiative recombination by passivating intrinsic defects in perovskites. Herein, a passivation treatment is developed by applying mixed bulky cations [guanidinium cation (GA+) and phenylethylammonium cations (PEA+)] as the additive for perovskite thin films. The internal interactions between the two bulky cations could result in lower carrier trap-state densities, a sharper Urbach tail, and better carrier transport in perovskite films in comparison with a control film. As a result, in comparison to the control device, which has a power conversion efficiency (PCE) of 18.92%, the mixed-cation-based device exhibits a dramatic enhancement of PCE of 20.64%. Importantly, after 720 h of storage in an ambient atmosphere with a relative humidity (RH) of 60–80% at room temperature, the mixed-cation-based device retains 62.7% of its original performance, whereas the control devices decay to less than 40% of their original performance.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.1c18520