Metal and organometal halide perovskites, an emerging class of direct bandgap semiconductors, have attracted great attention lately. Lead halide perovskites were recognized as promising candidates for future lighting applications, due to their high quantum yield, narrow full width at half maximum (FWHM), and wide color gamut. Nonetheless, the toxicity of lead induces new approaches such as obtaining lead-free perovskites and further investigation of their stability and optoelectronic properties.In this work is presented a study of lead-free perovskites (CH3NH3)3Bi2I9 film formation for a further application in optoelectronic devices. The experimental part consists of the formation (CH3NH3)3Bi2I9 films and a treatment part. First part has been performed with a quite popular spin-coating approach that provides accessibility and simplicity of the sample’s preparation. Secondly, a liquid nitrogen treatment has been carried out, afterward was investigated the effect of this treatment on the lead-free perovskites films.Keywords: Perovskite, films, lead-free, emission, stability
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