Enhanced long-term stability of perovskite solar cells using a double-layer hole transport materialElectronic supplementary information (ESI) available: Experimental section for device preparation, SEM images, and XPS measurement results. See DOI: 10.1039/c7ta03315j

• Main Authors: Li, Qi, Zhao, Yicheng, Fu, Rui, Zhou, Wenke, Zhao, Yao, Lin, Fang, Liu, Song, Yu, Dapeng, Zhao, Qing
• Format: Article
• Language: English
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c7ta03315j

The instability of hybrid organic-inorganic perovskite solar cells hinders their commercialization and further applications although they have reached high power conversion efficiency. Here we introduce a double-layer hole transport material into perovskite solar cells containing a CuSCN layer and spiro-OMeTAD layer simultaneously. Consequently, the long-term stability of the solar cells was significantly enhanced compared to those of single-layer devices and the devices can sustain about 90% of their initial power conversion efficiency after 10 hours of continuous working at the maximum power point. We ascribed the long-term stability enhancement to the suppression of methylamine migration by the CuSCN layer. Using a double-layer hole transport material configuration, perovskite solar cells sustain over 90% of their initial output after 10 h of steady-state measurement.