What question did this study set out to answer?

To improve the optical properties of wide-bandgap, triple-halide perovskites through doping with zinc cations and formate anions.

February 12, 2026Open Access

Enhancing Wide-Bandgap Triple-Halide Perovskites for Tandem Solar Cells by 0.5% Formate and Zn(II) Doping

Key Points

To improve the optical properties of wide-bandgap, triple-halide perovskites through doping with zinc cations and formate anions.
Doped wide-bandgap triple-cation, triple-halide perovskites with 0.5% zinc and 0.5% formate
Measured photoluminescence quantum yields and lifetimes on quartz substrates
Determined optimal total doping concentration of 1% for improved performance.
Achieved photoluminescence quantum yields of up to 14% on quartz
Recorded photoluminescence lifetimes of up to ~7 µs on quartz
Identified optimal doping concentration of zinc and formate as 1% relative to Pb(II).

Abstract

The intrinsic properties of wide-bandgap, triple-cation, triple-halide perovskites, like (Cs0.21FA0.74MA0.05)Pb(I0.81Br0.14Cl0.05)3, can be improved by simultaneous doping with zinc cations (0.5%) as well as formate anions (0.5%). Photoluminescence quantum yields (up to 14% on quartz), as well as photoluminescence lifetimes (up to ~7 µs on quartz), indicate improved optical properties. Based on photoluminescent properties, the optimal total doping concentration of zinc ions (Zn(II)) and formate anions (Fo−) is determined to be 1% relative to Pb(II).

Enhancing Wide-Bandgap Triple-Halide Perovskites for Tandem Solar Cells by 0.5% Formate and Zn(II) Doping

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Abstract

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