Perovskite solar cells (PSCs) exceeding a power conversion efficiency (PCE) of 20% have mainly been demonstrated by using mesoporous titanium dioxide (mp-TiO2) as an electron-transporting layer. However, TiO2 can reduce the stability of PSCs under illumination (including ultraviolet light). Lanthanum (La)-doped BaSnO3 (LBSO) perovskite would be an ideal replacement given its electron mobility and electronic structure, but LBSO cannot be synthesized as well-dispersible fine particles or crystallized below 500°C. We report a superoxide colloidal solution route for preparing a LBSO electrode under very mild conditions (below 300°C). The PSCs fabricated with LBSO and methylammonium lead iodide (MAPbI3) show a steady-state power conversion efficiency of 21.2%, versus 19.7% for a mp-TiO2 device. The LBSO-based PSCs could retain 93% of their initial performance after 1000 hours of full-Sun illumination.
Bibliographical noteFunding Information:
This work was supported by Global Frontier RandD Program for Multiscale Energy System (NRF-2011-0031565, NRF-2016M3A6A7945503), Climate Change Program (NRF-2015M1A2A2056542), and Wearable Platform Materials Technology Center (WMC-no. 2016R1A5A1009926) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning. This work was also financially supported by the KIST-UNIST partnership program (1.160097.01/2.160482.01). All data are presented in the main text and supplementary materials. S.S.S., J.H.N., J.S., and S.I.S. are inventors on a patent application (KR 10-2016-0040923) submitted by the Korea Research Institute of Chemical Technology and Ulsan National Institute of Science and Technology that covers the preparation of Ba(La)SnO3 particles and film at low temperature. S.S.S. and J.H.N. dedicate this paper to the memory of Prof. Kug Sun Hong, who passed away on 14 March 2014.
© 2017, American Association for the Advancement of Science. All rights reserved.
ASJC Scopus subject areas