Interface Engineering by Thiazolium Iodide Passivation Towards Reduced Thermal Diffusion and Performance Improvement in Perovskite Solar Cells,Advanced Functional Materials

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Interface Engineering by Thiazolium Iodide Passivation Towards Reduced Thermal Diffusion and Performance Improvement in Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-02-11 , DOI: 10.1002/adfm.201910561
Manuel Salado ₁ , Michael Andresini _{1,

2} , Peng Huang ₁ , Mohd Taukeer Khan _{1,

3} , Fulvio Ciriaco ₄ , Samrana Kazim _{1,

5} , Shahzada Ahmad _{1,

5}

Affiliation

Interface engineering has become one of the most facile and effective approaches to improve solar cells performance and its long‐term stability and to retard unwanted side reactions. Three passivating agents are developed which can functionalize the surface and induce hydrophobicity, by employing substituted thiazolium iodide (TMI) for perovskite solar cells fabrication. The role of TMI interfacial layers in microstructure and electro‐optical properties is assessed for structural as well as transient absorption measurements. TMI treatment resulted in V_OC and fill factor enhancement by reducing possible recombination paths at the perovskite/hole selective interface and by reducing the shallow as well as deep traps. These in turn allow to achieve higher performance as compared to the pristine surface. Additionally, the TMI passivated perovskite layer considerably reduces CH₃NH₃⁺ thermal diffusion and degradation induced by humidity. The un‐encapsulated perovskite solar cells employing TMI exhibit a remarkable stability under moisture levels (≈50% RH), retaining ≈95% of the initial photon current efficiency after 800 h of fabrication, paving the way towards a potential scalable endeavor.

中文翻译：

通过碘化噻唑鎓钝化进行界面工程，以减少钙钛矿型太阳能电池的热扩散并提高性能

界面工程已成为提高太阳能电池性能及其长期稳定性并阻止不良副反应的最简便有效的方法之一。通过使用取代的碘化噻唑鎓（TMI）进行钙钛矿型太阳能电池的制造，开发了三种可以使表面功能化并诱导疏水性的钝化剂。评估了TMI界面层在微结构和电光特性中的作用，以进行结构以及瞬态吸收测量。TMI治疗导致V _OC通过减少钙钛矿/孔选择性界面处可能的重组路径并减少浅陷阱和深陷阱来增强填充因子。与原始表面相比，这些继而允许实现更高的性能。另外，TMI钝化的钙钛矿层大大减少了CH ₃ NH ₃^+的热扩散和湿度引起的降解。采用TMI的未封装钙钛矿太阳能电池在湿度水平（约50％RH）下表现出显着的稳定性，在制造800小时后仍保持约95％的初始光子电流效率，从而为潜在的可扩展性努力铺平了道路。

更新日期：2020-04-06

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