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Synthesis and characterization of cadmium telluride nanowire

Title
Synthesis and characterization of cadmium telluride nanowire
Author
유봉영
Keywords
SEMICONDUCTOR NANOWIRES; DETECTOR MATERIAL; CHARGE-TRANSPORT; METAL NANOWIRES; SCHOTTKY DIODES; CDTE NANOWIRES; ELECTRODEPOSITION; FILMS; DEPOSITION; ALUMINUM
Issue Date
2008-07
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v. 19, No. 32, Article no. 325711
Abstract
CdTe nanowires with controlled composition were cathodically electrodeposited using track-etched polycarbonate membrane as scaffolds and their material and electrical properties were systematically investigated. As-deposited CdTe nanowires show nanocrystalline cubic phase structures with grain sizes of up to 60 nm. The dark-field images of nanowires reveal that the crystallinity of nanowires was greatly improved from nanocrystalline to a few single crystals within nanowires upon annealing at 200 circle C for 6 h in a reducing environment (5% H(2) + 95% N(2)). For electrical characterization, a single CdTe nanowire was assembled across microfabricated gold electrodes using the drop-casting method. In addition to an increase in grain size, the electrical resistivity of an annealed single nanowire (a few 10(5) Omega cm) was one order of magnitude greater than in an as-deposited nanowire, indicating that crystallinity of nanowires improved and defects within nanowires were reduced during annealing. By controlling the dopants levels (e. g. Te content of nanowires), the resistivity of nanowires was varied from 10(4) to 10(0) Omega cm. Current-voltage (I-V) characteristics of nanowires indicated the presence of Schottky barriers at both ends of the Au/CdTe interface. Temperature-dependent I-V measurements show that the electron transport mode was determined by a thermally activated component at T > -50 circle C and a temperature-independent component below -50 circle C. Under optical illumination, the single CdTe nanowire exhibited enhanced conductance.
URI
http://iopscience.iop.org/article/10.1088/0957-4484/19/32/325711/metahttps://repository.hanyang.ac.kr/handle/20.500.11754/80574
ISSN
0957-4484
DOI
10.1088/0957-4484/19/32/325711
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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