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- 摘要
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- 实验方案
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A Selfa??Powered Higha??Performance UV Photodetector Based on Corea??Shell GaN/MoO <sub/>3a??</sub><i> <sub/>x</sub></i> Nanorod Array Heterojunction
摘要： Self-powered UV photodetectors are highly desirable for applications in space communications and environmental monitoring. However, most self-powered UV photodetectors exhibit unimpressive performance in weak signal detection. Herein, a self-powered UV photodetector based on the core–shell GaN/MoO3–x nanorod array (NRA) heterojunction system is demonstrated. Homogeneous MoO3–x layers are deposited on GaN NRAs by a simple one-step physical vapor deposition method. The photodetector device shows an ultrahigh specific detectivity of 2.7 × 1015 Jones at 355 nm without any power supply. Further analyses reveal a responsivity of 160 A W?1 and a high UV–vis rejection ratio (R355 nm/R400 nm) of 2.0 × 104 under zero bias. The self-powered device also has a fast response speed with a rise/fall time of 73/90 μs. As a result, the self-powered photodetector, featuring ultrahigh detectivity and responsivity along with fast response, exhibits great potential for applications in next-generation UV detection. The core–shell NRA structure heterojunction design provides a valuable direction for realizing nanoscale self-powered UV photodetectors.
关键词： core–shell nanorod arrays,UV photodetectors,ultrahigh detectivity,self-powered devices
更新于2025-09-23 15:21:01
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Flexible and Selfa??Powered Photodetector Arrays Based on Alla??Inorganic CsPbBr <sub/>3</sub> Quantum Dots
摘要： Flexible devices are garnering substantial interest owing to their potential for wearable and portable applications. Here, flexible and self-powered photodetector arrays based on all-inorganic perovskite quantum dots (QDs) are reported. CsBr/KBr-mediated CsPbBr3 QDs possess improved surface morphology and crystallinity with reduced defect densities, in comparison with the pristine ones. Systematic material characterizations reveal enhanced carrier transport, photoluminescence efficiency, and carrier lifetime of the CsBr/KBr-mediated CsPbBr3 QDs. Flexible photodetector arrays fabricated with an optimum CsBr/KBr treatment demonstrate a high open-circuit voltage of 1.3 V, responsivity of 10.1 A W?1, specific detectivity of 9.35 × 1013 Jones, and on/off ratio up to ≈104. Particularly, such performance is achieved under the self-powered operation mode. Furthermore, outstanding flexibility and electrical stability with negligible degradation after 1600 bending cycles (up to 60°) are demonstrated. More importantly, the flexible detector arrays exhibit uniform photoresponse distribution, which is of much significance for practical imaging systems, and thus promotes the practical deployment of perovskite products.
关键词： self-powered devices,perovskites,flexible devices,photodetector arrays
更新于2025-09-23 15:19:57
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In Situ Formed Gradient Bandgapa??Tunable Perovskite for Ultrahigha??Speed Color/Spectruma??Sensitive Photodetectors via Electrona??Donor Control
摘要： Integration of various photodetectors with different light-sensitive materials and detection capacity is an inevitable way to achieve entire color/spectrum detection. However, the uneven capacity of each photodetector would drag the overall performance behind, especially the response speed. A response time down to nanosecond level has not previously been reported for a filter-free color/spectrum-sensitive photodetector, as far as is known. Here, a self-powered filterless color-sensitive photodetection array based on an in situ formed gradient perovskite absorber film with continuously tunable bandgap is demonstrated. Ultrahigh-speed response at nanosecond level is achieved in all the ingredient photodetectors. The junction capacitance being influenced by carrier concentration in the absorber is identified to be responsible for the detection speed. Without any optic or mechanical supporting system, the designed color detector exhibits an external quantum efficiency (EQE) up to 94% and a high spectral resolution of around 80 nm for the whole visible spectrum. This work offers a guidance to achieve fast response of perovskite-based photodetectors from the point of view of carrier-donor control and demonstrates a new avenue to establish color-sensitive photodetectors/spectrometers.
关键词： photodetectors,self-powered devices,color-sensitive photodetection,spectrum analysis,perovskites
更新于2025-09-23 15:19:57
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Self‐Powered Photodetectors Based on 2D Materials
摘要： Self-powered photodetectors are considered as a new type of photodetectors enabling self-powered photodetection without external power. The excellent photoresponsivity, fast photoresponse rate, low dark current, and large light on/off ratio of these photodetectors have attracted wide interest among scholars. 2D materials are widely used in self-powered photodetectors due to their excellent optical and electrical properties, unique 2D structures, and their capabilities to exhibit excellent photodetection performance. According to the self-driving mechanism of 2D material-based self-powered photodetectors, they are divided into three categories: p–n junction photodetectors, Schottky junction photodetectors, and photoelectrochemical photodetectors. From these three perspectives, the research progress of 2D material-based self-powered photodetectors is summarized in detail here. Research reports indicate that 2D material-based self-powered photodetectors have excellent self-powered photoresponse behavior, good light on/off characteristics, and wideband spectral response ranges. The excellent photoresponse performance of 2D material-based self-powered photodetectors facilitates their potential applications in the field of optoelectronic devices. In particular, self-powered photodetectors have great potential as novel emerging self-driven optoelectronic devices. Finally, directions for the further development of 2D material-based self-powered photodetectors are anticipated.
关键词： self-powered devices,photodetectors,2D materials
更新于2025-09-11 14:15:04