Solution-synthesized organic and inorganic semiconductors have recently received much attention for their applications in optoelectronic devices operating in the visible and near-infrared spectral regions. Here, we fabricate a photovoltaic detector architecture by use of hybrid metal halide perovskite film with selected cathode buffer layers. This device effectively converts the photons to current both in visible spectral range and in X rays. It is found that the device exhibits excellent performances with a transient response time as fast as 660 ns. In addition, we achieve an X-ray sensitivity up to 30 μC Gy<sup>-1</sup> cm<sup>-2</sup> for the hybrid perovskite photodetector. Thanks to the advantages of the device, such as the mechanical flexibility, low-cost and easy preparation, such photodetector based on solution-synthesized perovskite film is promising for photon detection in a wide spectral range.
The fusion gamma has an advantage to measure fusion reaction history in the deuterium-tritium (DT) fuel implosion experiments. A gas Cherenkov detector is available to measure DT fusion gamma in a high background environment. Simulation is carried out by Geant4 to evaluate the conversion efficiency and the time response of this Cherenkov detector. The background gamma rays are roughly estimated based on ENDF/B-VII.0 data, and the signal-to-noise (SNR) is evaluated based on the simulated energy response curve. The simulation result and the SNR analysis are helpful to construct the Cherenkov detector at Shenguang-III facility.
Wide field images have been widely applied in Visual reality, video compression, transmission and medical apparatus.
The image is usually obtained by using single wide-angle lens such as the fisheye lens or by merging the images scanned
with conventional cameras. The paper proposed a system by placing two cameras at a fixed distance between each other
so the large-scale field of view can be split into small parts and images are obtained synchronously. Because each
adjacent camera has been located fixedly, the corresponding field range of each image is known easily, and a stitching
algorithm based on correlation coefficient of corresponding pixel lists is used to merge the images. As shown by the
experiments, the system proposed in this paper is simple and effective for obtaining wide field image with both high
real-time quality and image resolution.