Pressure-Regulated Photovoltaic Response in Antimony Triiodide With Asymmetric Metal Contact

The effective modification of photovoltaic activities in photoelectric devices is significant for enhancing energy conversion efficiency. Here, the pressure-tunable photovoltaic properties in the SbI₃ device with Au/Pt asymmetric electrodes are demonstrated. At initial pressure, the SbI₃ device exhibits an anticipated self-driven photoresponse characteristic at zero external bias, and a significant enhancement in photocurrent response is observed with increasing bias to −0.2 V, nearly two orders of magnitude higher than the initial value. With increasing pressure, the SbI₃ device exhibits tunable photocurrent response, reaching a maximum value at ≈1.2 GPa, while the photovoltage response decreases monotonously during compression, which is closely associated with the dynamic evolution of the work function and bandgap of SbI₃ upon successive compression. These findings signify that SbI₃ is a promising candidate for future photoelectric devices, which opens a new window of opportunity for further exploration, regulation, and understanding of high-performance photovoltaic devices under extreme conditions.