Amidination of ligands for chemical and field-effect passivation stabilizes perovskite solar cells

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Science Pub Date : 2024-11-21 DOI:10.1126/science.adr2091

Yi Yang, Hao Chen, Cheng Liu, Jian Xu, Chuying Huang, Christos D. Malliakas, Haoyue Wan, Abdulaziz S. R. Bati, Zaiwei Wang, Robert P. Reynolds, Isaiah W. Gilley, Shuta Kitade, Taylor E. Wiggins, Stefan Zeiske, Selengesuren Suragtkhuu, Munkhbayar Batmunkh, Lin X. Chen, Bin Chen, Mercouri G. Kanatzidis, Edward H. Sargent

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Abstract

Surface passivation has driven the rapid increase in the power conversion efficiency (PCE) of perovskite solar cells (PSCs). However, state-of-the-art surface passivation techniques rely on ammonium ligands that suffer deprotonation under light and thermal stress. We developed a library of amidinium ligands, of interest for their resonance effect–enhanced N–H bonds that may resist deprotonation, to increase the thermal stability of passivation layers on perovskite surfaces. This strategy resulted in a >10-fold reduction in the ligand deprotonation equilibrium constant and a twofold increase in the maintenance of photoluminescence quantum yield after aging at 85°C under illumination in air. Implementing this approach, we achieved a certified quasi–steady-state PCE of 26.3% for inverted PSCs; and we report retention of ≥90% PCE after 1100 hours of continuous 1-sun maximum power point operation at 85°C.

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配体酰胺化用于化学和场效应钝化，稳定了过氧化物太阳能电池。

表面钝化技术推动了过氧化物太阳能电池（PSCs）功率转换效率（PCE）的快速提高。然而，最先进的表面钝化技术依赖于铵配体，而铵配体在光和热应力作用下会发生去质子化。我们开发了一个脒配体库，以提高过氧化物表面钝化层的热稳定性，脒配体因其共振效应增强的 N-H 键可抵抗去质子化而备受关注。采用这种策略后，配体的去质子化平衡常数降低了 10 倍以上，在空气中 85°C 光照下老化后维持光量子产率的能力提高了两倍。采用这种方法后，我们的倒置 PSC 达到了 26.3% 的认证准稳态 PCE；我们还报告说，在 85°C 下连续工作 1100 小时后，1-太阳最大功率点的 PCE 保持率≥90%。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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