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Stable Low-Bandgap Pb-Sn Binary Perovskites for Tandem Solar Cells
Zhibin Yang1, Adharsh Rajagopal1, Chu-Chen Chueh1
1Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.
Advanced Materials (Deerfield Beach, Fla.)
|August 23, 2016
Abstract:
A low-bandgap (1.33 eV) Sn-based MA0.5 FA0.5 Pb0.75 Sn0.25 I3 perovskite 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 MAPbI3 cell to achieve a high efficiency of 19.08%.

