Microscopic Analysis of Inherent Void Passivation in Perovskite Solar Cells,ACS Energy Letters

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Microscopic Analysis of Inherent Void Passivation in Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-07-05 00:00:00 , DOI: 10.1021/acsenergylett.7b00484
Gabseok Seo ₁ , Dongwook Lee ₂ , Sung Heo ₂ , Minsu Seol ₂ , Yonghui Lee ₃ , Kihong Kim ₂ , Seong Heon Kim ₂ , Jooho Lee ₂ , Dongho Lee ₂ , Jaehan Lee ₂ , Dong Wook Kwak ₄ , Dongwha Lee ₄ , Hoon Young Cho ₄ , Jucheol Park ₅ , Tae Kyu Ahn ₁ , Mohammad Khaja Nazeeruddin ₃

Affiliation

The presence of voids in perovskite solar cells influences the efficiency because of accelerated charge recombination. The induced electric field near voids due to band bending attracts photogenerated electrons and holes toward the voids, leading to carrier recombination. However, if the surface of the voids is coated by materials with a band gap higher than that of the perovskite layer, the strong electric field induced near the voids in the opposite way prevents carriers from recombining. We identified voids in the perovskite layer by using an electron beam-induced current technique and found the influence of field-assisted passivation by organic materials on the efficiency of the solar cell.

中文翻译：

钙钛矿型太阳能电池固有空隙钝化的微观分析

由于加速了电荷复合，钙钛矿太阳能电池中空隙的存在影响了效率。由于能带弯曲而在空隙附近产生的感应电场将光生电子和空穴吸引向空隙，从而导致载流子复合。但是，如果用具有比钙钛矿层的带隙高的带隙的材料覆盖空隙的表面，则以相反的方式在空隙附近感应出的强电场会阻止载流子复合。我们使用电子束感应电流技术识别了钙钛矿层中的空隙，并发现了有机材料的场辅助钝化对太阳能电池效率的影响。

更新日期：2017-07-05

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