Mixed 3D–2D Passivation Treatment for Mixed‐Cation Lead Mixed‐Halide Perovskite Solar Cells for Higher Efficiency and Better Stability,Advanced Energy Materials

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Mixed 3D–2D Passivation Treatment for Mixed‐Cation Lead Mixed‐Halide Perovskite Solar Cells for Higher Efficiency and Better Stability
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-04-16 , DOI: 10.1002/aenm.201703392
Yongyoon Cho ₁ , Arman Mahboubi Soufiani ₁ , Jae Sung Yun ₁ , Jincheol Kim ₁ , Da Seul Lee ₁ , Jan Seidel ₂ , Xiaofan Deng ₁ , Martin A. Green ₁ , Shujuan Huang ₁ , Anita W. Y. Ho-Baillie ₁

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Layered low‐dimensional perovskite structures employing bulky organic ammonium cations have shown significant improvement on stability but poorer performance generally compared to their 3D counterparts. Here, a mixed passivation (MP) treatment is reported that uses a mixture of bulky organic ammonium iodide (iso‐butylammonium iodide, iBAI) and formammidinium iodide (FAI), enhancing both power conversion efficiency and stability. Through a combination of inactivation of the interfacial trap sites, characterized by photoluminescence measurement, and formation of an interfacial energetic barrier by which ionic transport is reduced, demonstrated by Kelvin probe force microscopy, MP treatment of the perovskite/hole transport layer interface significantly suppresses photocurrent hysteresis. Using this MP treatment, the champion mixed‐halide perovskite cell achieves a reverse scan and stabilized power conversion efficiency of 21.7%. Without encapsulation, the devices show excellent moisture stability, sustaining over 87% of the original performance after 38 d storage in ambient environment under 75 ± 20% relative humidity. This work shows that FAI/iBAI, is a new and promising material combination for passivating perovskite/selective‐contact interfaces.

中文翻译：

混合阳离子铅混合卤化物钙钛矿太阳能电池的混合3D–2D钝化处理，可实现更高的效率和更好的稳定性

与3D对应物相比，使用大体积有机铵阳离子的层状低维钙钛矿结构已显示出显着的稳定性改善，但性能较差。这里，混合钝化（MP）治疗报道，使用（庞大有机碘化铵的混合物异丁基碘化铵，我BAI）和碘化甲醛（FAI），可提高功率转换效率和稳定性。通过以光致发光测量为特征的界面陷阱位点的灭活，以及通过减少离子迁移的界面高能垒的形成（通过开尔文探针力显微镜证实），钙钛矿/空穴传输层界面的MP处理显着抑制了光电流。磁滞现象。使用这种MP处理，冠军的混合卤化物钙钛矿电池可实现反向扫描，并将功率转换效率稳定在21.7％。在没有封装的情况下，该器件表现出出色的湿气稳定性，在相对湿度为75±20％的环境中存储38 d后，可保持原始性能的87％以上。这项工作表明，FAI /我BAI是一种新的且有希望的材料组合，可用于钝化钙钛矿/选择性接触界面。

更新日期：2018-04-16

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