Hydrophilic Fullerene Derivative Doping in Active Layer and Electron Transport Layer for Enhancing Oxygen Stability of Perovskite Solar Cells,Solar RRL

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Hydrophilic Fullerene Derivative Doping in Active Layer and Electron Transport Layer for Enhancing Oxygen Stability of Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2019-07-24 , DOI: 10.1002/solr.201900249
Guiying Xu ₁ , Shuhui Wang ₁ , Pengqing Bi ₂ , Haiyang Chen ₁ , Moyao Zhang ₁ , Rongming Xue ₁ , Xiaotao Hao ₂ , Zhaokui Wang ₃ , Yaowen Li ₁ , Yongfang Li _{1,

4}

Affiliation

Poor stability is one of the main limiting factors for the commercialization of perovskite solar cells (pero‐SCs). The degradation of perovskite films is usually triggered by the reaction of the perovskite active layer with the superoxide when exposed in ambient atmosphere, which is not prevented by simple encapsulation. Herein, an oxygen‐stabilizing effect is found by utilizing a hydrophilic [6,6]‐phenyl‐C₆₁‐butyric acid‐(3,4,5‐tris(2‐(2‐(2‐methoxyethoxy)ethoxy)ethoxy)phenyl)methanol ester (PCBB‐OEG) as a dopant of the perovskite film and electron‐transporting layer (ETL). PCBB‐OEG accelerates photoelectron transport in perovskite films and enhances the electron‐extracting ability of ETL. This process is demonstrated to efficiently prevent the reaction between electrons and oxygen to form a superoxide. Hence, the presence of PCBB‐OEG in the perovskite film improves its stability against oxygen. The stability and efficiency of pero‐SCs are further improved by doping PCBB‐OEG in [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) ETL. As a result, the p‐i‐n pero‐SCs with PCBB‐OEG as an additive in both the perovskite active layer and ETL show the best power conversion efficiency of 20.49%. Importantly, the related device retains 98% of this initial efficiency after 60 days of storage in ambient atmosphere without encapsulation.

中文翻译：

在活性层和电子传输层中进行亲水性富勒烯衍生物掺杂以增强钙钛矿型太阳能电池的氧稳定性

稳定性差是钙钛矿太阳能电池（pero-SCs）商业化的主要限制因素之一。钙钛矿膜的降解通常是由钙钛矿活性层与超氧化物在环境空气中暴露时的反应触发的，这不能通过简单的封装来防止。在此，通过使用亲水性[6,6]-苯基-C _61可达到稳定氧的作用钙钛矿薄膜和电子传输层（ETL）的掺杂剂-丁酸-（3,4,5-三（2-（2-（2-（2-甲氧基乙氧基）乙氧基）乙氧基）苯基）苯基）甲醇酯（PCBB-OEG））。PCBB-OEG加速了钙钛矿薄膜中的光电子传输，并增强了ETL的电子提取能力。事实证明，该过程可有效防止电子与氧之间的反应形成超氧化物。因此，钙钛矿膜中PCBB-OEG的存在改善了其抗氧稳定性。通过在[6,6]-苯基-C61-丁酸甲酯（PCBM）ETL中掺杂PCBB-OEG，可以进一步改善pero-SC的稳定性和效率。结果，p-i-n在钙钛矿活性层和ETL中添加PCBB-OEG作为添加剂的pero-SC的最佳功率转换效率为20.49％。重要的是，相关设备在环境空气中储存60天后无需封装即可保持98％的初始效率。

更新日期：2019-07-24

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