Solution-Processed BiI₃ Films with 1.1 eV Quasi-Fermi Level Splitting: The Role of Water, Temperature, and Solvent during Processing.

ABSTRACT: We present a mechanistic explanation of the BiI₃ film formation process and an analysis of the critical factors in preparing high-quality solution-processed BiI₃ films. We find that complexation with Lewis bases, relative humidity, and temperature are important factors during solvent vapor annealing (SVA) of films. During SVA, water vapor and higher temperatures limit the formation of the BiI₃-dimethylformamide coordination complex. SVA with an optimized water content and temperature produces films with 300-500 nm grains. Films that formed solvent coordination compounds at lower temperatures showed preferential crystal orientation after solvent removal, and we elucidate its implications for carrier transport. Addition of dimethyl sulfoxide to highly concent

SUBMITTER: Williamson BW 

PROVIDER: S-EPMC6644407 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature