Deep defect passivation and shallow vacancy repair via an ionic silicone polymer toward highly stable inverted perovskite solar cells

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 s...

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Bibliographic Details
Published in:Energy & environmental science 2022-10, Vol.15 (10), p.4414-4424
Main Authors: Wang, Tong, Li, Yuke, Cao, Qi, Yang, Jiabao, Yang, Bowen, Pu, Xingyu, Zhang, Youzi, Zhao, Junsong, Zhang, Yixin, Chen, Hui, Hagfeldt, Anders, Li, Xuanhua
Format: Article
Language:English
Subjects:
Additives
Defects
Design defects
Efficiency
Electrostatic properties
Energy conversion efficiency
Functional groups
Lead
Maximum power
Passivity
Perovskites
Photovoltaic cells
Polymers
Repair
Silicones
Solar cells
Stability
State power
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Summary: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 Pb 2+ 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.
ISSN:1754-5692
1754-5706
1754-5706
DOI:10.1039/D2EE02227C