Abstract
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 × 105 A/W, 8.99 × 10-8 W/cm2, 480 nm), green light (3.83 × 10 4 A/W, 4.48 × 10-8 W/cm2, 548 nm), and UV light (1.94 × 105 A/W, 1.59 × 10-8 W/cm 2, 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 -0.38% compressive strain. This is because the strain induced a piezopotential in ZnO, which tunes the barrier height at the ZnO-CdS heterojunction interface, leading to an optimized optoelectronic performance. This work demonstrates a promising application of piezo-phototronic effect in nanoheterojunction array based photon detectors.
Original language | English |
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Pages (from-to) | 4537-4544 |
Number of pages | 8 |
Journal | ACS Nano |
Volume | 7 |
Issue number | 5 |
DOIs | |
Publication status | Published - 28 May 2013 |
Externally published | Yes |
Keywords
- branched ZnO-CdS double-shell nanowire
- carbon fiber
- photodetector
- piezo-phototronic effect
- piezopotential