title: Stable Low-Bandgap Pb-Sn Binary Perovskites for Tandem Solar Cells.
abstract: A low-bandgap (1.33 eV) Sn-based MA0.5FA0.5Pb0.75Sn0.25I3perovskite is developed via combined compositional, process, and interfacial engineering. It can deliver a high power conversion efficiency (PCE) of 14.19%. Finally, a four-terminal all-perovskite tandem solar cell is demonstrated by combining this low-bandgap cell with a semitransparent MAPbI3cell to achieve a high efficiency of 19.08%.
authors.affiliation: Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
authors.forename: Zhibin
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
authors.forename: Adharsh
authors.initials: A
authors.lastname: Rajagopal
authors.affiliation: Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
authors.forename: Chu-Chen
authors.initials: CC
authors.lastname: Chueh
authors.affiliation: Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
authors.forename: Sae Byeok
authors.initials: SB
authors.lastname: Jo
authors.affiliation: Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhao
authors.affiliation: Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA. ajen@u.washington.edu.
authors.forename: Alex K-Y
authors.initials: AK
authors.lastname: Jen
keywords: Sn-based perovskites; compositional engineering; low bandgap; tandem solar cells