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Stable Quasi‐2D Perovskite Solar Cells with Efficiency over 18% Enabled by Heat–Light Co‐Treatment
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-09-18 , DOI: 10.1002/adfm.202004188 Xiaomei Lian 1 , Haotian Wu 1 , Lijian Zuo 1 , Guanqing Zhou 2 , Xinbo Wen 3 , Yingzhu Zhang 1 , Gang Wu 1 , Zengqi Xie 3 , Haiming Zhu 2 , Hongzheng Chen 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-09-18 , DOI: 10.1002/adfm.202004188 Xiaomei Lian 1 , Haotian Wu 1 , Lijian Zuo 1 , Guanqing Zhou 2 , Xinbo Wen 3 , Yingzhu Zhang 1 , Gang Wu 1 , Zengqi Xie 3 , Haiming Zhu 2 , Hongzheng Chen 1
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2D perovskite solar cells (2D PVSCs) show good stability for commercialization. However, their power conversion efficiency (PCE) is relatively low. In this work, a post‐treatment strategy by simultaneously applying light and heat to quasi‐2D PVSCs, obtaining a record PCE of 18.24% is developed. It is found that heat‐treating PVSCs in the dark slightly increases the device performance over time at temperatures below 75 °C, whereas the performance deteriorates rapidly at temperatures above 100 °C. Upon illumination, the device efficiency is significantly improved, particularly when the thermal‐treatment temperature is increased to 100 °C. A comprehensive carrier dynamic study reveals that the enhanced performance can be attributed to the reduced quasi‐2D perovskite defect states and improved charge collection. In addition, this strategy enables better stability, and an unencapsulated device can retain 90% of its original PCE after 1340 h of direct exposure to air with a humidity of 50 ± 5%. Thus, the strategy paves the way for the commercialization of quasi‐2D PVSCs.
中文翻译：
稳定的准2D钙钛矿太阳能电池，通过热光共处理可实现18％以上的效率
2D钙钛矿太阳能电池（2D PVSC）显示出良好的商业化稳定性。但是，它们的功率转换效率（PCE）相对较低。在这项工作中，通过将光和热同时应用于准2D PVSC，获得了创纪录的PCE为18.24％的后处理策略得以开发。发现在黑暗中对PVSC进行热处理在温度低于75°C时会随时间的推移稍微提高器件的性能，而在高于100°C的温度下性能会迅速下降。照明后，设备效率得到了显着提高，尤其是当热处理温度提高到100°C时。全面的载流子动力学研究表明，性能的提高可归因于减少的准2D钙钛矿缺陷状态和改进的电荷收集。此外，这种策略可实现更好的稳定性，并且未封装的设备在直接暴露于湿度为50±5％的空气中1340小时后，可以保留其原始PCE的90％。因此，该策略为准2D PVSC的商业化铺平了道路。
更新日期：2020-11-25
中文翻译：
稳定的准2D钙钛矿太阳能电池，通过热光共处理可实现18％以上的效率
2D钙钛矿太阳能电池（2D PVSC）显示出良好的商业化稳定性。但是，它们的功率转换效率（PCE）相对较低。在这项工作中，通过将光和热同时应用于准2D PVSC，获得了创纪录的PCE为18.24％的后处理策略得以开发。发现在黑暗中对PVSC进行热处理在温度低于75°C时会随时间的推移稍微提高器件的性能，而在高于100°C的温度下性能会迅速下降。照明后，设备效率得到了显着提高，尤其是当热处理温度提高到100°C时。全面的载流子动力学研究表明，性能的提高可归因于减少的准2D钙钛矿缺陷状态和改进的电荷收集。此外，这种策略可实现更好的稳定性，并且未封装的设备在直接暴露于湿度为50±5％的空气中1340小时后，可以保留其原始PCE的90％。因此，该策略为准2D PVSC的商业化铺平了道路。
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