Highly Reproducible and Efficient FASnI3 Perovskite Solar Cells Fabricated with Volatilizable Reducing Solvent
2020
Lead-free
tin halide perovskite solar cells (PSCs) have attracted
great attention because of their low toxicity, ideal band gap, and
high carrier mobilities. However, the efficiency and reproducibility
of tin halide PSCs has been limited because of the facile oxidation
of Sn2+ to Sn4+. Herein, liquid formic acid
(LFA) was introduced as a reducing solvent in the FASnI3 (FA: formamidinium) perovskite precursor solution. Unlike solid
reducing additives, the LFA solvent is volatile, so no residual LFA
remained in the FASnI3 perovskite film. Use of the LFA
solvent resulted in production of the FASnI3 perovskite
film with high crystallinity, low Sn4+ content, reduced
background doping, and low electronic trap density. As a result, an
efficiency of over 10% was obtained for lead-free tin halide PSCs
with improved reproducibility.
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