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Indium tin oxide (ITO) electrodes, applied to polyethylene terephthalate (PET) substrates, framed a BiSI film and gel electrolyte layer. The BiSI photodetector, boasting both flexibility and self-powering capabilities, yielded an open-circuit photovoltage of 68 mV and a short-circuit photocurrent density of 0.11 nA/cm² when exposed to light with an intensity of 0