Colloidally prepared La-doped BaSnO 3 electrodes for efficient, photostable perovskite solar cells

Seong Sik Shin, Eun Joo Yeom, Woon Seok Yang, Seyoon Hur, Min Gyu Kim, Jino Im, Jangwon Seo, Jun Hong Noh, Sang Il Seok

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Abstract

Perovskite solar cells (PSCs) exceeding a power conversion efficiency (PCE) of 20% have mainly been demonstrated by using mesoporous titanium dioxide (mp-TiO 2 ) as an electron-transporting layer. However, TiO 2 can reduce the stability of PSCs under illumination (including ultraviolet light). Lanthanum (La)-doped BaSnO 3 (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 (MAPbI 3 ) show a steady-state power conversion efficiency of 21.2%, versus 19.7% for a mp-TiO 2 device. The LBSO-based PSCs could retain 93% of their initial performance after 1000 hours of full-Sun illumination.

Original languageEnglish
Pages (from-to)167-171
Number of pages5
JournalScience
Volume356
Issue number6334
DOIs
Publication statusPublished - 2017 Apr 14

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Shin, S. S., Yeom, E. J., Yang, W. S., Hur, S., Kim, M. G., Im, J., Seo, J., Noh, J. H., & Seok, S. I. (2017). Colloidally prepared La-doped BaSnO 3 electrodes for efficient, photostable perovskite solar cells Science, 356(6334), 167-171. https://doi.org/10.1126/science.aam6620