SYNTHESIS OF Cu2ZnSnS4 FOR THIN FILM SOLAR CELLS PREPARED BY SOLUTION-BASED PROCESSES

Abstract

Copper zinc thin sulphide (Cu2ZnSnS4: CZTS) thin films were synthesized via convective deposition method at various deposit speeds based on sol-gel precursor of 2-methoxyethanol solution with metal chlorides and thiourea. The deposited films were annealed at 340 to 550ºC under N2 atmosphere to yield high quality CZTS films. The compositions, morphology, phase, and optical properties of the CZTS films were characterized by Energy dispersive X-ray analysis (EDX), Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and UV-Vis spectrophotometer, respectively. The formation films exhibited in kesterite structure and the band gap was about 1.4-1.5 eV. The CZTS films also applied as a hole transporting layer of organic photovoltaics solar cells. Although the power conversion efficiency of the OPV device with CZTS film is less value, but it is more stable than ordinary OPV device with PEDOT:PSS as a hole transporting layer.