[6,6]-Phenyl-C61-Butyric Acid Methyl Ester/Cerium Oxide Bilayer Structure as Efficient and Stable Electron Transport Layer for Inverted Perovskite Solar Cells
[6,6]-Phenyl-C61-Butyric Acid Methyl Ester/Cerium Oxide Bilayer Structure as Efficient and Stable Electron Transport Layer for Inverted Perovskite Solar Cells
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[6,6]-苯基-C-61-丁酸甲酯/氧化铈双层结构作为倒置钙钛矿太阳能电池高效稳定的电子传输层
DOI：
10.1021/acsnano.7b07754
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发表时间：
2018-03-01
期刊：
影响因子：
17.1
通讯作者：
Chen, Wei
中科院分区：
文献类型：
--
作者：
Fang, Rui;Wu, Shaohang;Chen, Wei
稳定性问题和高昂的材料成本构成了钙钛矿太阳能电池(PVSC)的最大障碍，阻碍了其可持续发展。在这里，我们证明，经过适当的表面修饰，低成本的CeOx纳米晶可以很好地分散在极性和非极性的溶剂中，并且很容易加工成高质量的电子传输层(ETL)。以“NiMgLiO/MAPbI(3)/[6，6]-苯基-C-61-丁酸甲酯(PCBM)/CeOx”为结构的反相PVSC的催化效率高达18.7%。特别是未封装的器件，其初始PCE几乎可以在30%湿度控制的空气中黑暗中保存30天，并且在N-2气氛中连续光浸泡和最大功率点跟踪200h也没有退化的迹象。这些结果已被证明与PCBM/CeOx双层ETL在有效的电子提取和良好的化学屏蔽方面所实现的双重功能有关。此外，具有“NiMgLiO/MAPbI(3)/CeOx”结构的全无机界面层结构的PVSC也获得了16.7%的效率，这反映了以极低的成本制备高效PVSC的潜力。
Stability issues and high material cost constitute the biggest obstacles of a perovskite solar cell (PVSC), hampering its sustainable development. Herein, we demonstrate that, after suitable surface modification, the low-cost cerium oxide (CeOx) nanocrystals can be well dispersed in both polar and nonpolar solvents and easily processed into high quality electron transport layers (ETLs). The inverted PVSC with the configuration of "NiMgLiO/MAPbI(3)/[6,6]-phenyl-C-61-butyric acid methyl ester (PCBM)/CeOx" has achieved a high efficiency up to 18.7%. Especially, the corresponding devices without encapsulation can almost keep their initial PCEs in 30% humidity-controlled air in the dark for 30 days and also show no sign of degradation after continuous light soaking and maximum power point tracking for 200 h in a N-2 atmosphere. These results have been proved to be associated with the dual functions achieved by the PCBM/CeOx bilayer ETLs in both efficient electron extraction and good chemical shielding. Furthermore, an all inorganic interfacial layer based PVSC with the configuration of "NiMgLiO/MAPbI(3)/CeOx" has also achieved a promising efficiency of 16.7%, reflecting the potential to fabricate efficient PVSCs with extremely low cost.