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All-inorganic CsAgBiBr/Cu SCN-based photodetectors for weak light imaging

Science China Materials 2021年第1期64卷 198-208页

作者： Genghua Yan Zhong Ji Zhuowei Li Bangqi Jiang Min Kuang Xiang Cai Ye Yuan Wenjie Mai Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou510632China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan UniversityGuangzhou510632China Guangdong Institute of New Materials Guangdong Academy of SciencesGuangzhou510650China Department of light Chemical Engineering Guangdong PolytechnicFoshan528041China

weak light imaging has drawn more and more attention because of its promising potential for practical applications in security monitoring and space exploration. In this work, all-inorganic Cs2AgBiBr6 double perovskite-based self-powered photodetectors containing inorganic copper thiocyanate(CuSCN) as hole-transport layers(HTLs) are successfully fabricated and applied for weak light imaging,which is the first report on the weak light imaging application of all-inorganic lead-free perovskite photodetectors. CuSCN films with favorable optical property and hole extraction capability are prepared via a cost efficient and fast solvent removal method, demonstrating the potential for high-performance perovskite-based devices as transparent components. It is revealed that the band alignment of the device is effectively optimized with the presence of CuSCN HTLs,which can availably transport holes while block electrons at the Cs2AgBiBr6/CuSCN interface, resulting in remarkable improvement of photoresponse performance. The responsivity and detectivity are 0.34 A W^-1 and 1.03×10^13 Jones,respectively. In particular, the light current has a boost of almost 10 times. Furthermore, the photodetectors are integrated into a self-built light detection imaging system utilizing the focused laser scanning imaging mode. With illumination of as low as 5 nW cm^-2(405 nm), the image involving graphics and words with a size of 5 cm×5 cm can still be distinctly recognized. These results suggest the promising potential of all-inorganic perovskite-based devices for weak light detection and imaging applications.

关键词： photodetector weak light imaging all-inorganic perovskite Cs2AgBiBr6 double perovskite CuSCN inorganic hole-transport layer

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Ghost imaging with Deep Learning for Position Mapping of weakly Scattered light Source

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Nanomanufacturing and Metrology 2021年第1期4卷 37-45页

作者： Yasuhiro Mizutani Shoma Kataoka Tsutomu Uenohara Yasuhiro Takaya Department of Mechanical Engineering Osaka UniversityOsaka 565-0871Japan

We propose ghost imaging(GI)with deep learning to improve detection ***,which uses an illumination light with random patterns and a single-pixel detector,is correlation-based and thus suitable for detecting weak ***,its detection time is too long for practical *** overcome this problem,we applied a convolutional neural network that was constructed based on a classification of the causes of ghost image degradation.A feasibility experiment showed that when using a digital mirror device projector and a photodiode,the proposed method improved the quality of ghost images.

关键词： Inspection Metrology Defect mapping Ghost imaging Single-pixel imaging Deep learning weak light imaging

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