Effects of S and Se contents on the physical and photovoltaic properties of Cu2ZnSn(SxSe1−x)4 nanoparticles

Cu2ZnSn(SxSe1−x)4 nanoparticles were synthesized by a facile solvothermal method. X-ray diffraction and Raman spectra measurements confirmed the structural transitions and phase purities of Cu2ZnSn(SxSe1−x)4 nanoparticles. The compositional ratios of Cu2ZnSn(SxSe1−x)4 nanoparticles were determined by energy dispersive spectrometer. With increasing Se content, more sheet-like particles appeared in the products. Absorption spectra results indicated that the bandgaps of Cu2ZnSn(SxSe1−x)4 nanoparticles were adjustable between 0.92 and 1.5 eV. Cu2ZnSn(SxSe1−x)4 nanoparticle-sensitized solar cells were fabricated and current density-voltage measurements displayed that sheet-like particles were contributive to the electron transmission.