Abstract
Tin sulfide (SnS) thin films were deposited on the soda lime glass (SLG) and Mo-coated SLG by radio frequency sputtering method at room temperature (RT). The structural, optical, and the photovoltaic properties were investigated by varying the argon pressure (PAr) from 6 to 50 mTorr. The scanning electron microscopy (SEM), electron dispersive spectroscopy (EDX), X-ray diffraction (XRD), micro-Raman spectroscopy, and photoluminescence spectroscopy (PL) confirmed that the as-grown samples at 30 mTorr pressure showed the single phase of orthorhombic SnS with the stoichiometric ratio. The variation in the grain size, shape, and a shift in the crystal plane from (111) to (101) were ascertained with an increase of PAr. The ultraviolet–visible spectroscopy revealed that all the SnS films exhibited a constant high optical absorption coefficient of 5.8 × 104 cm−1, whereas, the energy band gap reduced from 1.50 to 1.35 eV with the increase of PAr. The solar cell of RT-SnS at 30 mTorr showed the best power conversion efficiency of 0.38%.
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