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Impact of the selenisation temperature on the structural and optical properties of CZTSe absorbers
- Source :
- Sol Energ Mater Sol Cells, Solar Energy Materials and Solar Cells
- Publication Year :
- 2016
-
Abstract
- We present structural and optical spectroscopy studies of thin films of Cu2ZnSnSe4 (CZTSe) with strong copper deficiency deposited on Mo/Glass substrates and selenised at 450, 500 or 550°C. Solar cells fabricated from these films demonstrated efficiencies up to 7.4% for selenisation at 500°C. Structural analysis based on X-ray diffraction and Raman spectroscopy revealed the presence of SnSe2 in the film selenised at 450°C but not in the films selenised at higher temperatures. A progressive decrease of the Sn and Se content was observed as the selenisation temperature increased. Photoluminescence excitation was used to determine the bandgaps at 4.2 K. Detailed measurements of the temperature and excitation intensity dependencies of the photoluminescence spectra allow the recombination mechanisms of the observed emission bands to be identified as band-to-impurity and band-to-band transitions, and their evolution with selenisation temperature changes to be analysed. The strongest band-to-band transition is recorded in the PL spectra of the film selenised at 500°C and can be observed from 6 K to room temperature. The compositional and structural changes in the films and their influence on the optoelectronic properties of CZTSe and solar cells are discussed. © 2016 Elsevier B.V. All rights reserved.
- Subjects :
- Diffraction
STRUCTURE
Photoluminescence
Analytical chemistry
02 engineering and technology
01 natural sciences
RECOMBINATION MECHANISMS
Spectral line
symbols.namesake
STRUCTURE (COMPOSITION)
TIN COMPOUNDS
CU2ZNSNSE4
THIN FILMS
0103 physical sciences
Photoluminescence excitation
OPTICAL PROPERTIES
Thin film
Spectroscopy
QC
SELENISATION
SELENIUM COMPOUNDS
010302 applied physics
PHOTO-LUMINESCENCE EXCITATION
Renewable Energy, Sustainability and the Environment
business.industry
PHOTOLUMINESCENCE SPECTRUM
SOLAR CELLS
OPTOELECTRONIC PROPERTIES
021001 nanoscience & nanotechnology
ZINC COMPOUNDS
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
symbols
X RAY DIFFRACTION
Optoelectronics
PHOTOLUMINESCENCE
STRUCTURAL AND OPTICAL PROPERTIES
0210 nano-technology
business
Raman spectroscopy
Excitation
OPTICAL SPECTROSCOPY
COPPER COMPOUNDS
Subjects
Details
- Language :
- English
- ISSN :
- 09270248
- Database :
- OpenAIRE
- Journal :
- Sol Energ Mater Sol Cells, Solar Energy Materials and Solar Cells
- Accession number :
- edsair.doi.dedup.....e862341a26b7d0de857a3e1523ba49e4