We report the preparation of Cu_(2)Si_(x)Sn_(1−x)S_(3) thin films for thin film solar cell absorbers using the reactive magnetron co−sputtering technique.Energy dispersive spectrometer and x-ray diffraction analyses indicate that Cu_(2)Si_(x)Sn_(1−x)S_(3) thin films can be synthesized successfully by partly substituting Si atoms for Sn atoms in the Cu_(2)SnS_(3) lattice,leading to a shrinkage of the lattice,and,accordingly,by 2θshifting to larger values.The blue shift of the Raman peak further confirms the formation of Cu_(2)Si_(x)Sn_(1−x)S_(3).Environmental scanning electron microscope analyses reveal a polycrystalline and homogeneous morphology with a grain size of about 200–300 nm.Optical measurements indicate an optical absorption coefficient of higher than 104 cm^(−1) and an optical bandgap of 1.17±0.01 eV.
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