The hybrid halide perovskite methyl ammonium lead iodide thiocyanate – (CH3NH3)Pb(SCN)2I2 – is synthesized both as a powder and as a thin film. The crystal structure and key optical properties (band gap) are determined by diffuse reflectance spectra and X‐ray diffraction (Rietveld refinement) measurements and compared to density functional theory (DFT) state‐of‐the‐art calculations. It is found that the refined orthorhombic crystal structure presents 2D‐layer confinement, and that the optical band gap presented in this work does confirm some previous reports and rebuts other results, too.
Síntesis de películas delgadas depresentan una estructura amorfa; sin embargo, muestras con espesores mayores de 300 nm crecen con estructura cristalina correspondiente a la fase ZnSO 8 H 8 (sulfohidróxido de zinc), indicando que la película formada es realmente una mezcla de ZnS e hidróxidos de Zn, conocidos genéricamente en la literatura como Zn(S,OH).Abstract ZnS thin films were deposited by CBD (chemical bath deposition) method using a solution containing thiourea and zinc acetate as sources of S and Zn and ammonium citrate as complexing agent. The samples were grown on soda lime glass substrates covered with a Cu 2 SnZnS 4 (CZTS) thin film. Through an extensive parameter study carried out varying the main deposition parameter in a wide range, conditions were found to grow ZnS thin films with suitable properties to be used as buffer layer in Cu 2 SnZnS 4 based solar cells.
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