Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 18, Pages 8158-8163Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2009.05.034
Keywords
Cation-anion exchange; Nanocrystalline n-type CuIn3Se5; OVC; Photosensitive
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Funding
- Ministry of Education, Science and Technology (MEST) [M1080300131008M030031010]
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Nanocrystalline CuIn3Se5 thin films have been grown on ITO glass substrates using chemical ion exchange reactions with CdS, in alkaline medium at pH 11. The as-deposited films were annealed in air at 200 degrees C for 30 min and characterized using X-ray diffraction (XRD), transmission electron microscopy, energy dispersive X-ray analysis, X-ray photoelectron spectroscopy, and scanning electron microscopy to study the structural, compositional and morphological properties. The XRD patterns reveal the nanoparticles size to be of 18-20 nm diameter, while from the SEM images the nanoparticles size is estimated to be 20-30 nm. It is observed that the annealed films contain nanocrystallites connected with each other through grain boundaries, with grain size of about 100-125 nm and have an overall n-type electrical conductivity and higher photoconductivity. The current-voltage (I-V) characteristics (in dark and light) of these films indicated the formation of a Schottky like junction between the n-CuIn3Se5 (OVC) and CdS/ITO layers. (C) 2009 Elsevier B.V. All rights reserved.
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