Weak Light Performance of Synthesized Amorphous Sb2S3-Based Hybrid Solar Cell
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We report here on an inexpensive solar cell made entirely of a synthesized material (indium tin oxide/amorphous Sb2S3 + polyaniline composite/TiO2/electrolyte). The cell has a solid efficiency of around 2.5% at very low light intensity of only 5% sun, which makes it particularly suitable for indoor applications. As found, the cell performance at intensity of 5% sun is governed by high shunt resistance only. At higher light intensities (25% sun), however, the cell has lower efficiency (around 0.8%), governed by both series and shunt resistance. An initial decrease in the fill factor with the light intensity decrease is not sufficient to cause reduction in the cell efficiency, due to slight variations in voltage and current. A minimal permeability in the ultraviolet (UV) region and its almost constant value in the visible and near-infrared regions at low light intensity of 5% sun could be the reason for higher cell efficiency.