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Sensors 2014, 14(4), 7332-7341; doi:10.3390/s140407332

Optical Sensor Based on a Single CdS Nanobelt

1
State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
2
State Key Laboratory of Digital Manufacturing Equipment & Technology, Huazhong University of Science and Technology, Wuhan 430074, China
3
Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Microelectronics, Hunan University, Changsha 410082, China
*
Author to whom correspondence should be addressed.
Received: 3 March 2014 / Revised: 18 April 2014 / Accepted: 18 April 2014 / Published: 23 April 2014
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, an optical sensor based on a cadmium sulfide (CdS) nanobelt has been developed. The CdS nanobelt was synthesized by the vapor phase transportation (VPT) method. X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) results revealed that the nanobelt had a hexagonal wurtzite structure of CdS and presented good crystal quality. A single nanobelt Schottky contact optical sensor was fabricated by the electron beam lithography (EBL) technique, and the device current-voltage results showed back-to-back Schottky diode characteristics. The photosensitivity, dark current and the decay time of the sensor were 4 × 104, 31 ms and 0.2 pA, respectively. The high photosensitivity and the short decay time were because of the exponential dependence of photocurrent on the number of the surface charges and the configuration of the back to back Schottky junctions. View Full-Text
Keywords: CdS; nanobelt; optical sensor; Schottky contact; photosensitivity CdS; nanobelt; optical sensor; Schottky contact; photosensitivity
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Li, L.; Yang, S.; Han, F.; Wang, L.; Zhang, X.; Jiang, Z.; Pan, A. Optical Sensor Based on a Single CdS Nanobelt. Sensors 2014, 14, 7332-7341.

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