Synthesis and characterization of cadmium telluride nanowire

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 °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) Ω 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) Ω 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 °C and a temperature-independent component below -50 °C. Under optical illumination, the single CdTe nanowire exhibited enhanced conductance.

A General Solvothermal Route to the Synthesis of CoTe, Ag2Te/Ag, and CdTe Nanostructures with Varied Morphologies

“…The solid-solution-solid transformation has been extensively used to explain the formation of 1D nanostructured tellurides in the solution phase. [5,12,23,30,31,34] On the basis of the experimental results, we propose a possible solidsolution-solid reaction mechanism for the formation of CoTe, Ag 2 Te, and CdTe nanostructures. In the early stage, 2-formed again.…”

The Effect of Annealing on the Structural, Electrical and Optical Properties of CdTe Thin Films

“…Fig. (3) shows that the activation energy increases with increasing annealing temperature Ta and this may be attributed to improvement in the structure which leads to reduction of defect state (tail state) in the forbidden gap and this leads to increase in the energy [14]. These results are summarized in Table (2).…”

One-dimensional ZnO nanostructures: Solution growth and functional properties

“…Reproduced with permission applications. The traditional reaction conditions for fabricating CdTe are too stringent to allow the presence of ZnO nanowires [223][224][225][226]. Wang et al demonstrated the deposition of large-scale ZnO-CdTe core-shell nanowire arrays on indium-tin-oxide (ITO) substrates through a benign electrodeposition method (pH 8.3), which was compatible with the ZnO nanowires [213].…”