Synthesis and characterization by solid-state impedance spectroscopy of semiconductor Cu2ZnSnS4 material for photovoltaic technologies

[摘要] Current work is focused on the synthesis and characterization of a Cu2ZnSnS4material (Abbreviated CZTS), identified as a potential candidate for the manufacture of photovoltaic cells. The material was obtained by means of a hydrothermal route which permits a simple and economical alternative to synthesize advanced materials for photovoltaic applications. The synthesis of a solid started from corresponding metal nitrates of Cu(NO3)2.6H2O, Zn(NO3)2, Sn(NO3)4.6H2O and thiourea as S source, which were dissolved in deionized water until complete a 1.0mol L-1concentration. The solution was kept in a Teflon lined steel vessel with magnetic stirring (150 rpm) and treated at 300°C for 12 hours to form the crystalline phase. The initial characterization of solid was done using UV spectroscopy to validate the chemical process and identify the corresponding Band-gap around (1.43eV). The structural characterization by X-ray diffraction, confirmed the presence of nanometric solids (140-260nm). The morphological characterization by SEM analysis evidenced a homogeneous material in the form of micrometric aggregates, by a related synthesis method. Finally, the electrical characterization by means of solid state impedance spectroscopy demonstrated a semiconductor behaviour which evidenced the transport phenomena associated with a Warburg resistance.

[发布机构] Universidad Pedagógica y Tecnológica de Colombia Tunja, Colombia^1

[效力级别] 化学

[关键词] Electrical characterization;Impedance spectroscopy;Morphological characterization;Photovoltaic applications;Photovoltaic technology;Semiconductor behaviours;Structural characterization;Synthesis and characterizations