Diamond immersion photodetector for 213 nm deep-ultraviolet photodetection

Developing a photoelectric detector with independent power, compactness, and high environmental sensitivity is a key step to realize the energy-saving and sustainable integrated photoelectric system of next generation. In this paper, a p-type diamond single crystal (PDSC) is used as the photoelectrode to construct a self-powered deep ultraviolet light immersion photodetector with the photoelectrochemical (PEC) cell structure. Under the excitation of a deep ultraviolet light of 213 nm, this immersion photodetector exhibits an excellent responsivity of 20 mA W−1 and a short response/recovery time (50/38 m s). This superior performance is attributed to the successful synthesis of high-quality p-type diamond by the high-temperature and high-pressure method, which ensures an efficient light detection through the effective light collection. This kind of immersion detector based on the ultra-wide-bandgap diamond guarantees a stable detection for deep ultraviolet detection with efficient response, which displays a great potential in future application.