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Grain Boundary Defect Passivation of Triple Cation Mixed Halide Perovskite with Hydrazine-Based Aromatic Iodide for Efficiency Improvement.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-08-24 , DOI: 10.1021/acsami.0c10448 Sheikh Ifatur Rahman 1 , Buddhi Sagar Lamsal 1 , Ashim Gurung 1 , Ashraful Haider Chowdhury 1 , Khan Mamun Reza 1 , Nabin Ghimire 1 , Behzad Bahrami 1 , Wenqin Luo 2 , Raja Sekhar Bobba 1 , Jyotshna Pokharel 1 , Abiral Baniya 1 , Ashiqur Rahman Laskar 1 , Khalid Emshadi 1 , Md Tawabur Rahman 1 , Quinn Qiao 1, 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-08-24 , DOI: 10.1021/acsami.0c10448 Sheikh Ifatur Rahman 1 , Buddhi Sagar Lamsal 1 , Ashim Gurung 1 , Ashraful Haider Chowdhury 1 , Khan Mamun Reza 1 , Nabin Ghimire 1 , Behzad Bahrami 1 , Wenqin Luo 2 , Raja Sekhar Bobba 1 , Jyotshna Pokharel 1 , Abiral Baniya 1 , Ashiqur Rahman Laskar 1 , Khalid Emshadi 1 , Md Tawabur Rahman 1 , Quinn Qiao 1, 3
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Perovskites have been unprecedented with a relatively sharp rise in power conversion efficiency in the last decade. However, the polycrystalline nature of the perovskite film makes it susceptible to surface and grain boundary defects, which significantly impedes its potential performance. Passivation of these defects has been an effective approach to further improve the photovoltaic performance of the perovskite solar cells. Here, we report the use of a novel hydrazine-based aromatic iodide salt or phenyl hydrazinium iodide (PHI) for secondary post treatment to passivate surface and grain boundary defects in triple cation mixed halide perovskite films. In particular, the PHI post treatment reduced current at the grain boundaries, facilitated an electron barrier, and reduced trap state density, indicating suppression of leakage pathways and charge recombination, thus passivating the grain boundaries. As a result, a significant enhancement in power conversion efficiency to 20.6% was obtained for the PHI-treated perovskite device in comparison to a control device with 17.4%.
中文翻译：
三阳离子混合卤化物钙钛矿与肼基芳族碘化物的晶界缺陷钝化，以提高效率。
钙钛矿是史无前例的，在过去十年中，功率转换效率得到了较大的提高。然而，钙钛矿膜的多晶性质使其易受表面和晶界缺陷的影响，这大大阻碍了其潜在的性能。这些缺陷的钝化是进一步改善钙钛矿太阳能电池的光伏性能的有效方法。在这里，我们报告使用新型的基于肼的芳香族碘化物盐或苯基碘化氢碘（PHI）进行二次后处理，以钝化三阳离子混合卤化物钙钛矿薄膜中的表面和晶界缺陷。尤其是，PHI后处理可减少晶界电流，促进电子势垒，并降低陷阱态密度，表明抑制了泄漏途径和电荷复合，从而钝化了晶界。结果，与具有17.4％的控制装置相比，经PHI处理的钙钛矿装置获得了功率转换效率的显着提高至20.6％。
更新日期：2020-09-16
中文翻译：
三阳离子混合卤化物钙钛矿与肼基芳族碘化物的晶界缺陷钝化，以提高效率。
钙钛矿是史无前例的，在过去十年中，功率转换效率得到了较大的提高。然而，钙钛矿膜的多晶性质使其易受表面和晶界缺陷的影响，这大大阻碍了其潜在的性能。这些缺陷的钝化是进一步改善钙钛矿太阳能电池的光伏性能的有效方法。在这里，我们报告使用新型的基于肼的芳香族碘化物盐或苯基碘化氢碘（PHI）进行二次后处理，以钝化三阳离子混合卤化物钙钛矿薄膜中的表面和晶界缺陷。尤其是，PHI后处理可减少晶界电流，促进电子势垒，并降低陷阱态密度，表明抑制了泄漏途径和电荷复合，从而钝化了晶界。结果，与具有17.4％的控制装置相比，经PHI处理的钙钛矿装置获得了功率转换效率的显着提高至20.6％。
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