skip to main content

Title: Photoconductivities in anatase TiO{sub 2} nanorods

The photoconduction (PC) properties of single-crystalline titanium dioxide (TiO{sub 2}) nanorods (NRs) with anatase phase were investigated and compared. By examining the material's inherent properties, the anatase TiO{sub 2} NRs exhibit superior PC efficiency (quantitatively defined by normalized gain) which is near one order of magnitude higher than that of the rutile ones. The optimal photoconductive gain of the anatase NR device can also reach 1.6 × 10{sup 7} at the light intensity of 0.02 Wm{sup −2} and a low bias of 0.1 V. The power-dependent and time-resolved PC measurements were performed to investigate the physical mechanisms. The higher quantum efficiency and mobility product was confirmed to be responsible for the higher PC efficiency in the anatase TiO{sub 2} NRs in comparison to the rutile ones.
Authors:
 [1] ; ; ;  [2]
  1. Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan (China)
  2. Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan (China)
Publication Date:
OSTI Identifier:
22350916
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CARRIER MOBILITY; GAIN; MONOCRYSTALS; NANOSTRUCTURES; PHOTOCONDUCTIVITY; QUANTUM EFFICIENCY; TIME RESOLUTION; TITANIUM OXIDES; VISIBLE RADIATION