Piezo-phototronic Effect Enhanced Visible/UV Photodetector of a Carbon-Fiber/ZnO-CdS Double-Shell Microwire

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• 作者：Fang Zhang ; Simiao Niu ; Wenxi Guo ; Guang Zhu ; Ying Liu ; Xiaoling Zhang ; Zhong Lin Wang
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：May 28, 2013
• 年：2013
• 卷：7
• 期：5
• 页码：4537-4544
• 全文大小：679K
• 年卷期：v.7,no.5(May 28, 2013)
• ISSN：1936-086X

文摘

A branched ZnO-CdS double-shell NW array on the surface of a carbon fiber (CF/ZnO-CdS) was successfully synthesized via a facile two-step hydrothermal method. Based on a single CF/ZnO-CdS wire on a polymer substrate, a flexible photodetector was fabricated, which exhibited ultrahigh photon responsivity under illuminations of blue light (1.11 脳 10⁵ A/W, 8.99 脳 10^鈥? W/cm², 480 nm), green light (3.83 脳 10⁴ A/W, 4.48 脳 10^鈥? W/cm², 548 nm), and UV light (1.94 脳 10⁵ A/W, 1.59 脳 10^鈥? W/cm², 372 nm), respectively. The responsivity of this broadband photon sensor was enhanced further by as much as 60% when the device was subjected to a 鈭?.38% compressive strain. This is because the strain induced a piezopotential in ZnO, which tunes the barrier height at the ZnO鈥揅dS heterojunction interface, leading to an optimized optoelectronic performance. This work demonstrates a promising application of piezo-phototronic effect in nanoheterojunction array based photon detectors.

Keywords:

carbon fiber; branched ZnO-CdS double-shell nanowire; photodetector; piezopotential; piezo-phototronic effect