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Do the grain boundaries of β-In2S3 thin films have a role in sub-band-gap photosensitivity to 632.8 nm?
- Source :
- Journal of Applied Physics; Mar2008, Vol. 103 Issue 5, p053106, 6p, 1 Diagram, 1 Chart, 4 Graphs
- Publication Year :
- 2008
-
Abstract
- Highly photoconducting β-In<subscript>2</subscript>S<subscript>3</subscript> thin films with conducting grain boundaries were obtained, using “chemical spray pyrolysis” technique. By varying the atomic ratio of the precursor solution used for spray pyrolysis, the photoconductivity of these films could be tailored. Conducting grain boundaries were found only for samples with a specific stoichiometry and these films exhibited photoresponse to intrinsic and extrinsic excitation wavelengths in the range of 325–532 nm. Postdeposition vacuum annealing of these films enhanced the grain boundary conductivity, caused the films to exhibit persistent photoconductivity for both intrinsic and extrinsic excitations and extended the extrinsic photoresponse to wavelengths beyond 632.8 nm. Photoresponse to excitation wavelength of 632.8 nm was observed in films with and without conducting grain boundaries which proved that the extrinsic photoresponse to this wavelength was an effect associated with the defect chemistry of the β-In<subscript>2</subscript>S<subscript>3</subscript>. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHOTOCONDUCTIVITY
INDIUM compounds
PYROLYSIS
STOICHIOMETRY
WAVELENGTHS
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 103
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 31335152
- Full Text :
- https://doi.org/10.1063/1.2841488