Deposition of nano-structured multilayer coatings of Cu2ZnSnS4 (CZTS) thin films by vacuum thermal evaporation method

摘要

The three step deposition of binary sulfides in the order CuS/ZnS/SnS thin films are prepared on Molybdenum (Mo) substrate by thermal evaporation method in order to obtain kesterite Cu2ZnSnS4 (CZTS) thin films. The CZTS thin films were annealed 500°C for one hour. The Phase studies and chemical compositions were investigated to obtain CZTS thin films using X-ray Diffractometer and Scanning Electron Microscopy (SEM). The optimized CZTS thins films show good optical properties and Electrical Properties. CZTS thin film was found to have a direct energy band gap of 1.5eV. Surface morphology studies have been studied using Atomic Force Microscopy (AFM) and SEM. It is reported that the good quality films were achieved with order of stacking CuS/ZnS/SnS precursor layers in this paper. Further, it has been observed that the crystalline size of CZTS has been improved after the sulfurization.