A new publication in Opto-Electronic Science reports how high-quality diamonds empower narrowband deep ultraviolet photodetection.
This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: Fig. 1 (a) Schematic diagram of main physical processes occurring in diamond A under photoexcitation. (b) Absorption spectrum of diamond A. The inset shows a schematic diagram of absorption process and a differential spectrum of absorption coefficient. (c) PL spectrum of diamond A under 193 nm pulse excitation. (d) and (e) Spatial distribution of photoexcited excess carrier generation rate G and steady-state carriers within the device. The three selected wavelengths are 210 nm, 225 nm and 228 nm. (f) Experimental EQE and simplified-calculated EQE of the diamond A-based photodetector with the three selected wavelengths marked. This simplified model can well explain the decline of EQE at shortwave. Credit: Compuscript Ltd Compared to traditional broadband detectors, narrowband detectors have a more significant demand for applications in various industrial and cutting-edge scientific research fields due to their precise spectral resolution capabilities. Typically, there are two methods to achieve narrowband detection at specific wavelengths. The first method involves combining a broadband photodetector with bandpass filters, which is a simple and effective approach but is limited by the availability of filters for certain wavelength bands. The second method involves designing semiconductor structures to create intrinsic narrowband photodetectors without the need for filters. This approach reduces the complexity of the detection system compared to the first method and ensures good detection/imaging quality but places higher demands on the design of materials and devices. Intrinsic narrowband photodetectors without filters are gaining popularity in various industrial and scientific research fields, with successful applications in the visible and infrared spectral ranges in recent…