Optimization of growth parameters by Spray pyrolysis of Cu2MgSnS4 thin film for optoelectronic applications

Le résumé fourni par la source

Cu2MgSnS4 (CMTS) thin film are successfully deposited on glass substrate by spray pyrolysis technique. In this work, the impact of different growth parameters such as substrate temperature, volume solution, precursor concentration, and doping using silver and graphene is studied. The structural, morphological, optical and electrical properties of CMTS thin film are carried out by Xray Diffraction (XRD), Raman spectroscopy, Transmission Electron Microscope (TEM), High-Resolution Transmission Electron Microscope (HRTEM), Scanning Electron Microscope (SEM), UV-Vis spectrophotometer and Electrochemical Impedance Spectroscopy (EIS). The structural characterization showed that all optimized CMTS thin films elaborated at Ts = 210 °C, Vs = 100 ml, [S] = 40 mM and [Mg] = 5 mM exhibit the kesterite structure with a preferential growth orientation following the (112) direction. Raman analysis indicates that all CMTS thin films have an appropriate Raman peak at 331 cm-1. Morphological analysis shows a different behavior, the best crystallinity films with optimal growth parameters have a spherical grain and well distribution on film surface. Absorption coefficient was found to about of 104 cm-1 in the visible range and the value of the band gap varies from 1.2 to 1.8 eV, which indicates its good application for the manufacture of solar cells. A good electrical property obtained especially for Vs = 100 ml. The improvement in photocurrent of CMTS film prepared at [Mg] = 5 mM under illumination privilege its use as absorber layer for solar cell devices. The synthesized CMTS thin film has the potential to be applied in a variety of fields, including photocatalysis, humidity sensing and antibacterial activity.

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