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Stable Perovskite Solar Cells Enabled by Simultaneous Surface and Bulk Defects Passivation
Solar RRL ( IF 6.0 ) Pub Date : 2020-06-16 , DOI: 10.1002/solr.202000224 Kaikai Liu 1 , Liqiang Xie 1 , Peiquan Song 1 , Kebin Lin 1 , Lina Shen 1 , Yuming Liang 1 , Jianxun Lu 1 , Wenjing Feng 1 , Xiang Guan 1 , Chuanzhong Yan 1 , Chengbo Tian 1 , Zhanhua Wei 1
Solar RRL ( IF 6.0 ) Pub Date : 2020-06-16 , DOI: 10.1002/solr.202000224 Kaikai Liu 1 , Liqiang Xie 1 , Peiquan Song 1 , Kebin Lin 1 , Lina Shen 1 , Yuming Liang 1 , Jianxun Lu 1 , Wenjing Feng 1 , Xiang Guan 1 , Chuanzhong Yan 1 , Chengbo Tian 1 , Zhanhua Wei 1
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It is challenging to passivate defects that are buried in the depth of perovskite films; most of the reported passivation methods cannot reach the deep defects. Herein, methanol is adopted as a dual‐functional reagent to not only act as a solvent but also help the dissolved ions penetrate the depth of perovskite films. By treating the as‐prepared perovskite films with CsBr/methanol solution, Br− ions can react with the undercoordinated Pb2+, and Cs+ ions can fill in the cation vacancies. This strategy enables surface and bulk defects passivation to be achieved simultaneously. The nonradiative recombination of the double‐passivated devices is significantly suppressed and the migration of charged defects is remarkably hindered. As a result, an improved power conversion efficiency of 19.5% and an open‐circuit voltage of 1.183 V is achieved. Moreover, the passivated device can retain ≈80% of the initial efficiency after working for 500 h at maximum power point under 1‐sun illumination, whereas the pristine device reaches 80% of the initial efficiency after only 90 h. This work demonstrates that surface and bulk defects passivation is critical to improve the efficiency and long‐term operational stability of the perovskite solar cells.
中文翻译：
稳定的钙钛矿太阳能电池通过同时发生表面和本体缺陷钝化而实现
钝化埋在钙钛矿薄膜深处的缺陷具有挑战性。大多数报道的钝化方法无法达到深层的缺陷。在此，甲醇被用作双功能试剂，不仅充当溶剂，而且还帮助溶解的离子穿透钙钛矿薄膜的深度。通过用溴化铯/甲醇溶液，溴所制备的钙钛矿薄膜-离子可与undercoordinated铅反应2+，和Cs +离子可以填充阳离子空位。这种策略使表面和整体缺陷钝化可以同时实现。双重钝化器件的非辐射复合得到显着抑制，带电缺陷的迁移受到显着阻碍。结果，功率转换效率提高了19.5％，开路电压达到1.183V。此外，钝化设备在1阳光照射下在最大功率下工作500小时后，仍可以保持约80％的初始效率，而原始设备仅在90 h后即可达到初始效率的80％。这项工作表明表面和整体缺陷钝化对于提高钙钛矿太阳能电池的效率和长期运行稳定性至关重要。
更新日期：2020-06-16
中文翻译：
稳定的钙钛矿太阳能电池通过同时发生表面和本体缺陷钝化而实现
钝化埋在钙钛矿薄膜深处的缺陷具有挑战性。大多数报道的钝化方法无法达到深层的缺陷。在此，甲醇被用作双功能试剂，不仅充当溶剂，而且还帮助溶解的离子穿透钙钛矿薄膜的深度。通过用溴化铯/甲醇溶液，溴所制备的钙钛矿薄膜-离子可与undercoordinated铅反应2+，和Cs +离子可以填充阳离子空位。这种策略使表面和整体缺陷钝化可以同时实现。双重钝化器件的非辐射复合得到显着抑制，带电缺陷的迁移受到显着阻碍。结果，功率转换效率提高了19.5％，开路电压达到1.183V。此外，钝化设备在1阳光照射下在最大功率下工作500小时后，仍可以保持约80％的初始效率，而原始设备仅在90 h后即可达到初始效率的80％。这项工作表明表面和整体缺陷钝化对于提高钙钛矿太阳能电池的效率和长期运行稳定性至关重要。
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