Diamond-Based All-Carbon Photodetectors for Solar-Blind Imaging

Single-crystalline diamond wafers are synthesized, and all-carbon solar-blind photodetectors are constructed based on the diamond with interdigitated graphite as electrodes. The graphite electrodes are made by laser-induced graphitization of the diamond. The peak responsivity of the photodetector is 21.8 A W-1, and detectivity is 1.39 x 10(12) cm Hz(1/2) W-1 when the bias voltage is 50 V, it is noted that both of these are among the best values ever reported for diamond-based photodetectors. The photodetectors are employed as the sensing pixels in an imaging system, and a clear image is obtained, which is the first report on solar-blind imaging of diamond photodetectors. The results reported in this paper provide a facile approach to high-performance diamond solar-blind photodetectors and their applications in solar-blind imaging, thus may address a significant step toward the preparation and application of diamond photodetectors.