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Deep defect passivation and shallow vacancy repair via an ionic silicone polymer toward highly stable inverted perovskite solar cells
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-09-03 , DOI: 10.1039/d2ee02227c
Tong Wang, Yuke Li, Qi Cao, Jiabao Yang, Bowen Yang, Xingyu Pu, Youzi Zhang, Junsong Zhao, Yixin Zhang, Hui Chen, Anders Hagfeldt, Xuanhua Li

Additive engineering is an effective strategy for defect passivation and performance improvement of perovskite solar cells (PSCs). However, few additives have achieved outstanding stability with high efficiency by simultaneously passivating deep and shallow defects. Herein, we design a novel ionic silicone polymer (PECL) with multi-active sites as an additive to modify inverted PSCs. The C–O groups in the PECL polymer can chelate with undercoordinated Pb2+ and Pb clusters to passivate deep defects; and the ionic groups in the PECL polymer can generate electrostatic interaction with both positively and negatively charged vacancies, which help to repair shallow defects. Moreover, we quantitatively reveal the effect of deep and shallow defects on the efficiency and stability of PSCs separately, by establishing the correlation between additives with different functional groups and the performance of devices. Consequently, the power conversion efficiency of the PECL-modified inverted PSC increases from 20.02% to 23.11%. More importantly, the encapsulated PSCs maintain 95% of their initial steady-state power output after 1500 hours under AM 1.5 illumination at the maximum power point at 45 °C. Therefore, we provide a universal guideline of polymer structure design for defect healing in stabilizing PSCs with high efficiency.

中文翻译:

通过离子有机硅聚合物对高度稳定的倒置钙钛矿太阳能电池进行深度缺陷钝化和浅空位修复

增材工程是钙钛矿太阳能电池(PSC)缺陷钝化和性能改进的有效策略。然而,很少有添加剂通过同时钝化深部和浅部缺陷来实现出色的稳定性和高效率。在此,我们设计了一种具有多活性位点的新型离子有机硅聚合物 (PECL) 作为添加剂来修饰倒置 PSC。PECL 聚合物中的 C-O 基团可以与欠配位的 Pb 2+螯合和 Pb 簇钝化深层缺陷;PECL聚合物中的离子基团可以与带正电和带负电的空位产生静电相互作用,有助于修复浅层缺陷。此外,我们通过建立具有不同官能团的添加剂与器件性能之间的相关性,分别定量揭示了深浅缺陷对 PSC 效率和稳定性的影响。因此,PECL 改性的倒置 PSC 的功率转换效率从 20.02% 提高到 23.11%。更重要的是,封装的 PSC 在 45 °C 的最大功率点下,在 AM 1.5 照明下 1500 小时后保持其初始稳态功率输出的 95%。所以,
更新日期:2022-09-03
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