Homogeneous Grain Boundary Passivation in Wide-Bandgap Perovskite Films Enables Fabrication of Monolithic Perovskite/Organic Tandem Solar Cells with over 21% Efficiency.

PaperPaios
Written By Fluxim AG

Yue-Min Xie, Yong Cao et al.

Adv. Funct. Mater. 2022, 2112126.

https://doi.org/10.1002/adfm.202112126

Monolithic perovskite/organic tandem solar cells have attracted increasing attention due to their potential of being highly efficient while compatible with facile solution fabrication processes. This work has carefully optimized mixed halide wide-bandgap perovskite (MWP) films by introducing a small amount of formamidinium (FA+) cations into the basic composition of MA1.06PbI2Br(SCN)0.12, which provides an effective means to modulate the crystallization properties and phase stability of the films. At optimized conditions, the MA0.96FA0.1PbI2Br(SCN)0.12 forms high-quality films with grain boundaries homogeneously passivated by PbI2, leading to a reduction in defect states and an enhancement in phase stability, enabling the fabrication of perovskite solar cells with a power conversion efficiency(PCE) of 17.4%. By further integrating the MWP front cell with an organic BHJ (PM6:CH1007) rare cell composed of a non-fullerene acceptor with absorption extended to 950 nm, a tandem cell with PCE over 21% is achieved.

PAIOS was used to analyze these solar cells with Electrochemical Impedance Spectroscopy

Fluxim AG
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