- 标题
- 摘要
- 关键词
- 实验方案
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Faceta??Dependent, Fast Response, and Broadband Photodetector Based on Highly Stable Alla??Inorganic CsCu <sub/>2</sub> I <sub/>3</sub> Single Crystal with 1D Electronic Structure
摘要： Low-dimensional metal halides at molecular level, which feature strong quantum confinement effects from intrinsic structure, are emerging as ideal candidates in optoelectronic fields. However, developing stable and nontoxic metal halides still remains a great challenge. Herein, for the first time, high-crystalline and highly stable CsCu2I3 single crystal, which is acquired by a low-cost antisolvent vapor assisted method, is successfully developed to construct high-speed (trise/tdecay = 0.19 ms/14.7 ms) and UV-to-visible broadband (300–700 nm) photodetector, outperforming most reported photodetectors based on individual all-inorganic lead-free metal halides. Intriguingly, facet-dependent photoresponse is observed for CsCu2I3 single crystal, whose morphology consists of {010}, {110}, and {021} crystal planes. The on–off ratio of {010} crystal plane is higher than that of {110} crystal plane, mainly owing to lower dark current. Furthermore, photogenerated electrons are localized in twofold chains created by [CuI4] tetrahedra, leading to relatively small effective mass and fast transport mobility along the 1D transport pathway. Anisotropic carrier transport characteristic is related to stronger confinement and higher electron density for {110} crystal planes. This work not only demonstrates the great potential of CsCu2I3 single crystal in high-performance optoelectronics, but also gives insights into 1D electronic structure associated with fast photoresponse and high anisotropy.
关键词： photodetectors,facet-dependent photoresponse,1D electronic structures,highly stable,fast response
更新于2025-09-23 15:21:01
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Transfer of Highly Stable Frequency Signals on a 150 km Fiber-Optic Communications Line
摘要： The results are presented for the study of an installation for transmission of a highly stable frequency signal with relative instability no greater than 4·10–17 on a ? ber-optic communications line over a distance of 150 km. The installation uses external modulation of laser radiation and active electronic compensation of phase noise. The installation makes it possible to provide synchronization or time scale comparison of mutually separated time and frequency standards that are a component of the highest-category time and frequency standards.
关键词： active electronic compensation of phase noise,highly stable frequency signal,time-and-frequency standards,? ber optical communications line
更新于2025-09-09 09:28:46