Preparation and Properties of MA0.9FA0.1PbI3 Perovskite Solar Cells by Br- doping

Yunpeng Zhao; Hari Bala; Fei Cheng; Yingjie Wen; Boji Wang

doi:10.54097/v4s1em69

Authors

Yunpeng Zhao
Hari Bala
Fei Cheng
Yingjie Wen
Boji Wang

DOI:

https://doi.org/10.54097/v4s1em69

Keywords:

Perovskite solar cells; MA₀.₉FA₀.₁PbI₂.₈₅Br₀.₁₅; Carbon electrode; Stability.

Abstract

In this study, under fixed cation stoichiometry, the effects of Br⁻ doping with varying ratios on the structural and optoelectronic properties of perovskite films and corresponding device performance were systematically investigated. The substitution of Br⁻ for partial I⁻ in the perovskite lattice demonstrated significant morphological refinement and enhanced crystallographic quality, as evidenced by reduced defect density and grain boundary formation. The optimized composition, MA₀.₉FA₀.₁PbI₂.₈₅Br₀.₁₅, exhibited superior film uniformity and crystallinity, which translated into improved photovoltaic parameters in carbon-electrode-based perovskite solar cells (PSCs). The champion device achieved a power conversion efficiency (PCE) of 9.33%, outperforming the undoped MA₀.₉FA₀.₁PbI₃ counterpart. Environmental stability assessments revealed that unencapsulated Br⁻-doped devices maintained 92% of their initial PCE after 60 days in ambient atmosphere (25°C, 40–60% RH), demonstrating markedly enhanced operational durability compared to the undoped control group. This work highlights halogen engineering as an effective strategy for simultaneously optimizing phase stability and defect passivation in mixed-halide perovskite systems.

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