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article
Trapping effects and surface/interface recombination of carrier recombination in single- or poly-crystalline metal halide perovskites
Abstract
<jats:title>Abstract</jats:title><jats:p>The lifetime of a carrier is a crucial parameter for solar cell materials, and metal halide perovskite materials are promising for solar cell applications. In this study, we observed carrier recombination using time-resolved photoluminescence (TR-PL) and microwave photoconductivity decay (<jats:italic>μ</jats:italic>-PCD) in metal halide perovskite materials: NH<jats:sub>3</jats:sub>CH<jats:sub>3</jats:sub>PbI<jats:sub>3</jats:sub> (MAPbI<jats:sub>3</jats:sub>), NH<jats:sub>3</jats:sub>CH<jats:sub>3</jats:sub>PbBr<jats:sub>3</jats:sub> (MAPbBr<jats:sub>3</jats:sub>), and CsPbBr<jats:sub>3</jats:sub> with single- and poly-crystalline structures. By comparing the decay curves of TR-PL and <jats:italic>μ</jats:italic>-PCD, we found trap levels in the band gap for all the materials. We employed two excitation wavelengths for the <jats:italic>μ</jats:italic>-PCD measurements, and we observed faster <jats:italic>μ</jats:italic>-PCD signal decays for short wavelength excitation for MAPbBr<jats:sub>3</jats:sub> and CsPbBr<jats:sub>3</jats:sub>. Additionally, we established that the poly-crystals exhibited faster decay compared with the single crystals for MAPbBr<jats:sub>3</jats:sub> and CsPbBr<jats:sub>3</jats:sub>. Therefore, we concluded that there are significant contributions of the interface and surface recombination on carrier recombination for MAPbBr<jats:sub>3</jats:sub> and CsPbBr<jats:sub>3</jats:sub>, but not for MAPbI<jats:sub>3</jats:sub>.</jats:p>