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

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photovoltaics

Background:

• Wide-bandgap, triple-cation, triple-halide perovskites are promising materials for optoelectronic applications.
• Their intrinsic properties often require enhancement for optimal performance.

Purpose of the Study:

• To investigate the effect of simultaneous doping with zinc cations and formate anions on perovskite properties.
• To determine the optimal doping concentration for improved optical characteristics.

Main Methods:

• Simultaneous doping of (Cs_0.21FA_0.74MA_0.05)Pb(I_0.81Br_0.14Cl_0.05)₃ perovskite with zinc cations and formate anions.
• Characterization of optical properties using photoluminescence quantum yield and lifetime measurements.

Main Results:

• Doping with 0.5% zinc cations and 0.5% formate anions improved optical properties.
• Photoluminescence quantum yields reached up to 14% on quartz.
• Photoluminescence lifetimes extended up to approximately 7 µs on quartz.

Conclusions:

• Simultaneous doping is an effective strategy to enhance the intrinsic properties of wide-bandgap perovskites.
• An optimal total doping concentration of 1% (0.5% Zn(II) and 0.5% Fo^-) was identified.
• Enhanced optical properties suggest potential for improved device performance in optoelectronics.