Van der Waals semiconductor based self-powered transparent broadband photodetector

•A highly transparent self-powered van der Waal broadband photodetector.•A unique heterojunction of Ga2O3/SnS was developed.•A high current density of 1.7 mA/cm2 and an open-circuit voltage of 476 mV were recorded.•Transparent photodetector exhibits 48% of average visible transmittance.•The highest responsivity of 210 mA/W at 0 V was recorded with a rise time of 8 ms.