Efficient and stable solution-processed planar perovskite solar cells via contact passivation.
Research paper by
Hairen H Tan, Ankit A Jain, Oleksandr O Voznyy, Xinzheng X Lan, F Pelayo FP García de Arquer, James Z JZ Fan, Rafael R Quintero-Bermudez, Mingjian M Yuan, Bo B Zhang, Yicheng Y Zhao, Fengjia F Fan, Peicheng P Li, Li Na LN Quan, Yongbiao Y Zhao, Zheng-Hong ZH Lu, Zhenyu Z Yang, Sjoerd S Hoogland, Edward H EH Sargent
Planar perovskite solar cells made entirely via solution-processing at low temperatures (<150°C) offer promise for simple manufacturing, compatibility with flexible substrates, and perovskite-based tandem devices; however, they require an electron-selective layer that performs well with similar processing. We report a contact passivation strategy using chlorine-capped TiO2 colloidal nanocrystal (NC) film that mitigates interfacial recombination and improves interface binding in low-temperature planar solar cells. We fabricated solar cells with certified efficiencies of 20.1% and 19.5% for active areas of 0.049 and 1.1 square centimeters, respectively, achieved via low-temperature solution processing. Solar cells with efficiency >20% retained 90% (97% after dark recovery) of their initial performance after 500 hours continuous room-temperature operation at their maximum power point under one-sun illumination.