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Cs0.15FA0.85PbI3/CsxFA1-xPbI3 Core/Shell Heterostructure for Highly Stable and Efficient Perovskite Solar Cells
Cell Reports Physical Science ( IF 7.9 ) Pub Date : 2020-10-14 , DOI: 10.1016/j.xcrp.2020.100224
Zijian Peng , Qi Wei , Hao Chen , Yawen Liu , Fei Wang , Xianyuan Jiang , Weiyan Liu , Wenjia Zhou , Shengjie Ling , Zhijun Ning

Dissociation of organic molecules is one critical factor leading to degradation of perovskite solar cells. The much-improved thermal stability of formamidinium (FA) can significantly reduce molecular dissociation; however, FA-based perovskite suffers from high defect density, which affects efficiency and long-term stability. In this work, based on a precise ion-exchange reaction at the grain surface, we fabricate a Cs0.15FA0.85PbI3/CsxFA1-xPbI3 heterostructure with a Cs-rich CsxFA1-xPbI3 quasi-shell structure. The Cs-rich inorganic structure on the perovskite surface increases defect formation energy and reduces defect density, leading to a power conversion efficiency of 20.7%. The encapsulated device maintains 95% of its initial efficiency after 1,000 h of continuous operation, corresponding to a calculated lifetime approaching 2 years. The device can operate at 60°C for 250 h and at 85°C for over 3,000 min, which is one of the best operational stabilities for CsxFA1-xPbI3-based devices.



中文翻译:

Cs 0.15 FA 0.85 PbI 3 / Cs x FA 1-x PbI 3核/壳异质结构,用于高度稳定和高效的钙钛矿太阳能电池

有机分子的解离是导致钙钛矿太阳能电池降解的一个关键因素。大大提高的甲)(FA)的热稳定性可以显着减少分子解离。然而,基于FA的钙钛矿的缺陷密度高,这会影响效率和长期稳定性。在这项工作中,基于晶粒表面的精确离子交换反应,我们制备了Cs 0.15 FA 0.85 PbI 3 / Cs x FA 1-x PbI 3异质结构和富Cs的Cs x FA 1-x PbI 3准壳结构。钙钛矿表面上富含Cs的无机结构增加了缺陷形成能并降低了缺陷密度,从而导致功率转换效率为20.7%。连续运行1,000小时后,封装的设备可保持其95%的初始效率,相当于2年的计算寿命。该器件可以在60°C下运行250小时,在85°C下运行超过3,000分钟,这是基于Cs x FA 1-x PbI 3的器件的最佳运行稳定性之一。

更新日期:2020-10-30
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