A Compact and Smooth CH₃NH₃PbI₃ Film: Investigation of Solvent Sorts and Concentrations of CH₃NH₃I towards Highly Efficient Perovskite Solar Cells.

ABSTRACT: Four solvents (isopropanol (IPA), n-butyl alcohol (NBA), n-amyl alcohol (NAA), and n-hexyl alcohol (NHA)) were investigated to prepare CH₃NH₃I (methylammonium iodide, MAI) solutions to transform PbI₂ film into CH₃NH₃PbI₃ (MAPbI₃) film. It was found that the morphology of the perovskite MAPbI₃ film was not only affected by the chain of the solvent molecule, but also by the concentration of MAI. The use of solvents with a long alkyl chain (NAA and NHA) allowed the MAPbI₃ to grow via an in situ transformation step, which easily made the perovskite films compact, but with a high surface roughness due to the growth of unexpected nanorods/nanoplates. The solvent with a short alkyl chain (IPA) led to the dissolution-crystallization growth mechanism, resulting in rapid

SUBMITTER: Chen L 

PROVIDER: S-EPMC6265889 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature