Zhengzhou University developed a diamond-based solar blind photodetection imaging device
Recently, the team of Professor Ding Chongxin from the School of Physics and Engineering of Zhengzhou University developed a new type of solar blind photodetection imaging device using the excellent semiconductor photoelectric properties of diamonds. The related research results were published in the international journal Advanced Optical Materials. Professor Shan Chongxin and Associate Professor Lu Yingjie are the authors of the correspondence, and Dr. Lin Chaonan is the first author. Ultraviolet light with a wavelength of less than 280 nm in sunlight will be strongly scattered and absorbed by atmospheric components such as ozone, water vapor, and particulate matter after entering the atmosphere, and it is difficult to reach the surface of the earth. Therefore, the ultraviolet light in this band is usually called the solar blind band. The ultraviolet detector working in the solar blind band has a wide and important application in the military field where the false alarm rate is extremely high because there is no interference from the sun, the largest radiation source on the earth, and the target signal is easy to detect and is not prone to false alarms. prospect. Diamond has the advantages of large forbidden band width, high thermal conductivity, high carrier mobility and strong radiation resistance, making it one of the ideal candidate materials for high performance solar blind UV detectors. In 2016, Professor Shan Chongxin successfully developed a chemical vapor deposition method to prepare carat-grade diamonds, and developed a diamond crystal with good transparency. This time, the team used laser direct writing technology to prepare finger-type graphite electrodes on the diamond surface, and successfully constructed a diamond-based photodetector with full carbon structure. The method for preparing the detector has the advantages of simple process, flexible structure and low cost. The detector response cutoff edge is at 225 nm, which corresponds to the diamond intrinsic absorption edge. The UV/visible suppression ratio is close to 4 orders of magnitude, demonstrating that the device has good solar blind response characteristics. The device has a responsiveness of 21.8 amps/W at a bias voltage of 50 volts and a detection rate of 1.39 × 1012 Jones, which is one of the best results of the currently reported diamond-based solar blind detector. The good performance of the device is due to the high quality diamond preparation and the in-situ formation of the graphite electrode in good contact with the diamond. Subsequently, the team built the solar blind imaging system as a photosensitive unit, and obtained clear images, which is an effective way to explore the application of diamond in the field of solar blind imaging. Car Parking Device,Parking Device,Hot Sale Car Parking Device,Car Parking Device For Sale Shanxi KathayTech Co.,ltd. , https://www.ccagoods.com