- 标题
- 摘要
- 关键词
- 实验方案
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Vein detection with near-infrared organic photodetectors for biometric authentication
摘要： We combine a low dark current and high-detectivity near-infrared (NIR)-sensitive organic photodetector with a high-resolution 508 pixels per inch (ppi) oxide thin-film transistor (TFT) backplane to create a large-area thin NIR detector, using processes that are compatible with flat-panel display fabrication. The detector is characterized showing high uniformity and linearity. With the use of a NIR light source, the detector is capable of imaging the (pattern of) veins under the skin in reflection, leading to improved biometric authentication.
关键词： near-infrared organic photodiodes,vein detection,biometric authentication,large-area photodetector arrays
更新于2025-09-23 15:21:01
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Printed Higha??Density and Flexible Photodetector Arrays via Sizea??matched Heterogeneous Microa??/Nanostructure
摘要： Semiconductor/metal binary systems constitute the core components in electronic/photonic devices. The domain size of the heterostructure should be comparable to the charge diffusion length for superior photoelectric response. However, the fabrication of size-matched heterostructures is still a challenge, especially for printed devices. Here, a high-density photodetector array with lateral semiconductor/metal heterostructure is achieved via the template-assisted sequentially printing strategy. The Ag/PBDB-T:ITIC/Ag based lateral heterojunction that matches the charge diffusion length in the charge transfer process provides high light response sensitivity (D* = 3.41 × 1012 Jones, R = 12.9 A W?1). Moreover, the printed pixel interval can be decreased to 10 μm (106 pixels cm?2; resolution: 2.5 × 103 dpi). As the printing strategy can be implemented on soft substrates, the photodetector arrays are endowed with the flexibility. This work demonstrates a simple and effective strategy for chip-scale fabrication of flexible high-performance photodetectors, which validates the potential of printed heterogeneous micro-/nanostructures for integrated active electronics and optics.
关键词： flexible photodetector arrays,light imaging,sequential printing,heterostructures
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