A Polymerization-Assisted Grain Growth Strategy for Efficient and Stable Perovskite Solar Cells

Advanced Materials
Yepin ZhaoYang Yang

Abstract

Intrinsically, detrimental defects accumulating at the surface and grain boundaries limit both the performance and stability of perovskite solar cells. Small molecules and bulkier polymers with functional groups are utilized to passivate these ionic defects but usually suffer from volatility and precipitation issues, respectively. Here, starting from the addition of small monomers in the PbI2 precursor, a polymerization-assisted grain growth strategy is introduced in the sequential deposition method. With a polymerization process triggered during the PbI2 film annealing, the bulkier polymers formed will be adhered to the grain boundaries, retaining the previously established interactions with PbI2 . After perovskite formation, the polymers anchored on the boundaries can effectively passivate undercoordinated lead ions and reduce the defect density. As a result, a champion power conversion efficiency (PCE) of 23.0% is obtained, together with a prolonged lifetime where 85.7% and 91.8% of the initial PCE remain after 504 h continuous illumination and 2208 h shelf storage, respectively.

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Citations

Feb 14, 2021·Nature Communications·Huan LingYan Jun Liu
May 20, 2021·The Journal of Physical Chemistry Letters·Tianqi NiuHin-Lap Yip
Jul 26, 2021·Journal of Colloid and Interface Science·Caiyun LiuTingli Ma
Jul 10, 2021·ACS Applied Materials & Interfaces·Yuanyuan ZhangSung Heum Park
Sep 9, 2021·Chemical Society Reviews·Sebastiano BellaniFrancesco Bonaccorso
Sep 11, 2021·The Journal of Physical Chemistry Letters·Do Hyung ChunJong Hyeok Park

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