Synthesis and electrical characteristics of Ag2S nanocrystals

Abstract

In this paper, Ag2S nanocrystals were synthesized by the colloidal method at room temperature. The synthesized Ag2S nanocrystals were spherical in shape with a diameter of about 10-20 nm and high crystallinity, which were confirmed by the high resolution transmission electron microscope images and selected-area electron diffraction patterns. In order to investigate the electrical properties of the Ag2S nanocrystals, a back-gate thin film transistor (TFT) device structure was fabricated on SiO2/Si substrates. The drain current of TFT composed of Ag2S was increased according to the increase in the voltages of drain-source and gate, revealing n-type semiconductor properties. The phase of the Ag2S nanocrystals, which is related to their electrical properties, was proved to be alpha-phase by then-no-gravimetric analysis, differential thermal analysis, and X-ray diffraction. (C) 2007 Elsevier B.V. All rights reserved.