High-performance multifunctional solar-blind photodetector based on Gd-doped perovskite rare-earth nickelate heterojunctions

Solar-blind photodetectors based on wide bandgap semiconductors have attracted great interest in recent years. Perovskite rare-earth nickelates are stable p-type semiconductors with adjustable physical properties that are promising candidates for this application. This paper presents a high-performance multifunctional solar-blind photodetector made of NdxGd1−xNiO3/Nb:SrTiO3 heterojunctions utilizing photovoltaic effects. A high position sensitivity of up to 667.03 mV/mm and a fast relaxation time of 1.75 μs were observed under 266 nm laser irradiation and AM1.5 sunlight. A space optical communication system with solar-blindness was achieved. Additionally, an ultraviolet light image sensing system was developed with this device under a light intensity as low as 0.3 μW/cm2. The fast relaxation time and high position sensitivity of rare-earth nickelates make them a promising candidate for self-powered high-performance multifunctional solar-blind detectors.