Reductive 2D Capping Layers through Dopamine Salt Incorporation for Pb–Sn Mixed Perovskite Solar Cells,ACS Energy Letters

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Reductive 2D Capping Layers through Dopamine Salt Incorporation for Pb–Sn Mixed Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-11-28 , DOI: 10.1021/acsenergylett.3c02039
Rui Meng ₁ , Can Li ₁ , Jishan Shi ₁ , Zhi Wan ₁ , Zhihao Li ₁ , Chongyang Zhi ₁ , Yicong Zhang ₁ , Zhen Li ₁

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Pb–Sn mixed perovskite is a crucial component in all-perovskite tandem cells. However, it remains a challenging task to fabricate Pb–Sn perovskite solar cells (PSCs) due to the facile oxidation of Sn²⁺. In this work, we incorporate dopamine cation (DAH⁺) to create a reductive 2D capping layer on a Pb–Sn perovskite film, simultaneously enhancing the efficiency and stability of Pb–Sn PSCs. Dopamine acts as a strong reducing agent that effectively reduces Sn⁴⁺ to Sn²⁺. The 2D/3D heterojunction induces downward band bending at the perovskite top surface, facilitating carrier separation and extraction. Consequently, the champion PSC achieved a power conversion efficiency (PCE) of 22.31%. Benefiting from the protection of the reductive 2D capping layer, the device’s stability is notably enhanced with 86% of the initial PCE retaining after 1000 h operation in N₂. This work demonstrates a promising strategy of constructing a multifunctional 2D passivation layer toward high quality Pb–Sn mixed perovskite devices.

中文翻译：

通过多巴胺盐掺入还原二维覆盖层用于铅-锡混合钙钛矿太阳能电池

铅锡混合钙钛矿是全钙钛矿串联电池的重要组成部分。然而，由于Sn ²⁺容易氧化，制造Pb-Sn钙钛矿太阳能电池（PSC）仍然是一项具有挑战性的任务。在这项工作中，我们结合多巴胺阳离子（DAH ⁺）在 Pb-Sn 钙钛矿薄膜上创建还原性二维覆盖层，同时提高 Pb-Sn PSC 的效率和稳定性。多巴胺作为强还原剂，有效地将Sn ⁴⁺还原为Sn ²⁺。2D/3D 异质结在钙钛矿顶表面引起向下的能带弯曲，有利于载流子分离和提取。因此，冠军 PSC 的功率转换效率 (PCE) 达到 22.31%。得益于还原性二维覆盖层的保护，器件的稳定性显着增强，在N ₂中运行1000小时后，初始PCE保留了86% 。这项工作展示了构建多功能二维钝化层以实现高质量 Pb-Sn 混合钙钛矿器件的有前途的策略。

更新日期：2023-11-28

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