Organometallic halide perovskites have great application prospects in high-performance flexible perovskite solar cells (f-PSC). However, f-PSCs still face significant challenges in forming uniform and highly crystalline films with mechanical robustness. Ge Ziyi, Liu Chang and others from the Ningbo Institute of Materials Science, Chinese Academy of Sciences introduced zwitterionic elastomer (SBMA) into the perovskite film. SBMA regulates perovskite nucleation and crystallization by forming intermediate SBMA-PbI2 adducts.
Furthermore, the polar sulfo end groups on SBMA provide chemical passivation for perovskite vacancies and create a large dielectric environment that shields the carrier trapping process and suppresses nonradiative recombination. The zwitterionic fusion in the cross-linked elastomer is located at the grain boundaries, giving the flexible perovskite film the ability to instantaneously self-cure under mild processing conditions (40°C, 15 minutes).
The flexible battery has a power conversion efficiency (PCE ) of 24.51%, a certified efficiency of up to 24.1%, and excellent mechanical sustainability and durability, as well as retaining more than 90% of the initial PCE after 10,000 bending cycles.
Yaohua Wang et.al Utilizing electrostatic dynamic bonds in zwitterion elastomer for self-curing of flexible perovskite solar cells Joule 2024
DOI: 10.1016/j.joule.2024.01.021
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