Efficient Environment-friendly Lead-free Tin Perovskite Solar Cells Enabled by Incorporating 4-Fluorobenzylammonium Iodide Additives,Energy & Environmental Materials

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Efficient Environment-friendly Lead-free Tin Perovskite Solar Cells Enabled by Incorporating 4-Fluorobenzylammonium Iodide Additives
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2022-06-29 , DOI: 10.1002/eem2.12465
Shengli Zou ₁ , Shengqiang Ren ₁ , Yiting Jiang ₁ , Yuanfang Huang ₁ , Wenwu Wang ₁ , Changlei Wang ₂ , Cong Chen ₁ , Xia Hao ₁ , Lili Wu ₁ , Jingquan Zhang ₁ , Dewei Zhao ₁

Affiliation

Development of tin (Sn)-based perovskite solar cells (PSCs) largely lags behind that of lead counterparts due to fast crystallization process of Sn perovskite and numerous defects in both bulk and surface of Sn perovskite films. Herein, this work reports a facile strategy of introducing 4-fluorobenzylammonium iodide (FBZAI) as additives into Sn perovskite precursor to synergistically modulate the roles of benzylamine and fluorine in Sn-based PSCs. Incorporation of FBZAI can increase crystallinity, passivate defects, and inhibit the oxidation of Sn²⁺, leading to suppression of nonradiative recombination and enhancement of charge transport and collection in devices. As a result, the best-performing Sn-based PSC with the FBZAI additive achieves the maximum PCE of 13.85% with the enhanced fill factor of 77.8% and open-circuit voltage of 0.778 V. Our unencapsulated device exhibits good stability by maintaining 95% of its initial PCE after 160 days of storage.

中文翻译：

添加4-氟苄基碘化铵添加剂的高效环保无铅锡钙钛矿太阳能电池

由于锡钙钛矿的快速结晶过程以及锡钙钛矿薄膜块体和表面的大量缺陷，锡基钙钛矿太阳能电池（PSC）的发展大大落后于铅太阳能电池。在此，这项工作报告了一种简单的策略，将 4-氟苄基碘化铵 (FBZAI) 作为添加剂引入锡钙钛矿前体中，以协同调节苄胺和氟在锡基 PSC 中的作用。FBZAI的加入可以提高结晶度、钝化缺陷并抑制Sn ²⁺的氧化，从而抑制非辐射复合并增强器件中的电荷传输和收集。结果，使用 FBZAI 添加剂的性能最佳的 Sn 基 PSC 实现了 13.85% 的最大 PCE，填充因子提高了 77.8%，开路电压为 0.778 V。我们的未封装器件保持了 95% 的稳定性，表现出良好的稳定性。储存 160 天后的初始 PCE。

更新日期：2022-06-29

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