Innovative Development and Prospects of Solar-Blind Photodetectors

This study delves into the advancements and challenges in the development of solar-blind photodetectors, focusing on ultrawide bandgap (UWBG) semiconductors. Solar-blind photodetectors, which operate in the UV-C range shielded by the Earth's ozone layer, are distinguished for their accuracy and reliability in various applications, including aerospace, military, environmental monitoring, and more. The research highlights the significance of materials like AlGaN, diamond, and few-layer hexagonal boron nitride (h-BN) for their exceptional properties such as high responsivity, thermal stability, and immunity to visible light interference. Innovations such as the low-temperature direct growth method for h-BN on sapphire substrates are underscored for enhancing fabrication efficiency and integration prospects. Moreover, the challenges related to doping, epitaxial growth, and substrate optimization are discussed, with insights into potential solutions that could advance the performance and reliability of these detectors. The future of solar-blind photodetection technology appears promising with ongoing efforts to explore new semiconductor materials and enhance device functionalities, ensuring their pivotal role in critical applications across diverse fields.