Band gap engineering by substitution of S by Se in nanostructured CdS1-xSex thin films grown by soft chemical route for photosensor application

Title
Band gap engineering by substitution of S by Se in nanostructured CdS1-xSex thin films grown by soft chemical route for photosensor application
Author
한성환
Keywords
Thin film; X-ray diffraction; Optical properties; Electrical properties; Soft chemical route
Issue Date
2014-06
Publisher
ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Citation
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, 권; 27, 페이지: 404-411
Abstract
Ternary alloys of CdS1-xSex (x=0, x=0.2, x=0.4, x=0.6, x=0.8, x=1) thin films were prepared on to glass substrates by a simple and economical soft chemical route (chemical bath deposition) at 50 degrees to 80 degrees C in air. The as grown films were characterized by optical and electrical measurement systems, X-ray diffraction (XRD), Energy dispersive X-ray analysis (EDAX) and SEM (scanning electron microscopy). The optical study reveals shift in the absorption edge towards the higher wavelengths, i.e. the band gap decreases as a function of 'x' (quantity of selenium in the bath). I-V measurement of CdS (resulted when x=0), CdS1-xSex (x=0.2, x=0.4, x=0.6, x=0.8) and CdSe (resulted when x=1) thin films under dark and illumination conditions (60 W) were measured. Increase in photoconductivity is observed, suggesting its applicability in photosensor devices. Electrical resistivity shows semiconducting behavior and activation energy decreases. The XRD patterns reveals that deposited thin films have hexagonal mixed structure. EDAX confirmed the compositional parameters. SEM images showed uniform deposition of the material over the entire glass substrate. (C) 2014 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S1369800114003941?via%3Dihubhttp://hdl.handle.net/20.500.11754/56075
ISSN
1369-8001; 1873-4081
DOI
10.1016/j.mssp.2014.07.014
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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