Abstract
Abstract Methylammonium lead mixed-halide perovskite (CH3NH3PbI3−xClx) has been widely used for photovoltaic conversion. Supposedly, the presence of chloride ions in perovskite precursors enhances the coverage, morphology, and stability of the final perovskite film. It also improves carrier diffusion length in the perovskite film. Due to these advantages, the mixed-halide compound has been adopted for use in planar structure perovskite solar cells and it has led to significant enhancement in power conversion efficiency. However, until now, the exact content of chloride in the final product (CH3NH3PbI3−xClx) is under debate and has not been reported yet. In this article, we show the exact amount of chloride ions in the final perovskite film, determined by chemical analysis with ion chromatography.
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