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Cerium oxide standing out as an electron transport layer for efficient and stable perovskite solar cells processed at low temperature

Research paper by Xin Wang, Lin-Long Deng, Lu-Yao Wang, Si-Min Dai, Zhou Xing, Xin-Xing Zhan, Xu-Zhai Lu, Su-Yuan Xie, Rong-Bin Huang, Lan-Sun Zheng

Indexed on: 08 Jan '17Published on: 12 Dec '16Published in: Journal of Materials Chemistry A



Abstract

In high performance perovskite solar cells (PSCs), the electron transport layer (ETL) has overwhelmingly been dominated by compact titanium oxide (TiO2), which typically requires sintering at around 500 °C. Such a high-temperature sintering procedure prevents TiO2-based PSCs from matching well with plastic substrates and low-cost manufacturing. Here we report cerium oxide (CeOx, x = 1.87), that was prepared facilely through a simple sol–gel method at low temperature (∼150 °C), as an alternative to high-temperature sintering processed TiO2 in the regular architecture of PSCs. With a PCE of 14.32% from the involvement of an optimized CeOx ETL through adjusting the precursor solution, and a higher PCE of 17.04% through introducing a [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) interfacial layer between the CeOx ETL and the perovskite layer, the present work about CeOx-based PSCs renders low-temperature solution-processed CeOx an excellent ETL for high performance perovskite solar cells with improved stability.

Graphical abstract 10.1039/C6TA07541J.gif