High-Work-Function 2D Perovskites as Passivation Agents in Perovskite Solar Cells,ACS Energy Letters

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High-Work-Function 2D Perovskites as Passivation Agents in Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-08-29 , DOI: 10.1021/acsenergylett.3c01326
Erfan Shirzadi ₁ , Fatemeh Ansari ₁ , Hiroaki Jinno ₁ , Shun Tian ₁ , Olivier Ouellette ₁ , Felix. T. Eickemeyer ₁ , Brian Carlsen ₁ , Antoine Van Muyden ₁ , Hiroyuki Kanda ₁ , Naoyuki Shibayama ₂ , Farzaneh Fadaei Tirani ₁ , Michael Grätzel ₁ , Anders Hagfeldt ₁ , Mohammad Khaja Nazeeruddin ₁ , Paul J. Dyson ₁

Affiliation

Various approaches have been employed to passivate the defects in perovskite films used in perovskite solar cells (PSCs). However, the passivation mechanism is often unclear at a molecular level, and the reason for enhanced PSC performance often remains elusive. Here, we explore the impact of passivation with high-work-function two-dimensional (2D) perovskites in promoting the efficiency of PSCs. We realized that 4-halophenylethylammonium lead iodide possesses a high work function, causing band bending at the perovskite surface, thus suppressing charge carrier recombination at the perovskite/hole transporting material (HTM) interface by forming a barricade for electrons to recombine at the trap states. Utilizing this strategy leads to a ∼100 mV improvement in voltage and a ∼2.5% increase in power conversion efficiency (PCE).

中文翻译：

高功函数二维钙钛矿作为钙钛矿太阳能电池的钝化剂

人们已采用各种方法来钝化钙钛矿太阳能电池（PSC）中使用的钙钛矿薄膜中的缺陷。然而，钝化机制在分子水平上通常不清楚，并且PSC性能增强的原因通常仍然难以捉摸。在这里，我们探讨了高功函数二维 (2D) 钙钛矿钝化对提高 PSC 效率的影响。我们意识到4-卤代苯乙基碘化铅具有高功函数，在钙钛矿表面引起能带弯曲，从而通过形成电子在陷阱态复合的屏障来抑制钙钛矿/空穴传输材料（HTM）界面上的载流子复合。。利用这一策略可使电压提高约 100 mV，功率转换效率 (PCE) 提高约 2.5%。

更新日期：2023-08-29

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