Detailed Study of Bandgap Energy Levels in CdTe Films Electrodeposited from Chlorine-Containing Solutions
✍ Scribed by Rakhshani, A.E. ;Makdisi, Y.
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 145 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Thin films of CdTe are electrodeposited at different temperatures and potentials on stainless steel foil substrates from a 1M CdSO 4 solution containing chlorine (0.03 to 0.06 M). Current±voltage, conductivity±temperature and photoinduced current transient spectroscopy measurements have been performed on devices formed by evaporation of semitransparent Au electrodes on CdTe. The bandgap energy levels in these films have a distinctly different spectrum compared to films deposited from Cl-free solutions. In addition to some deep hole levels which can also exist in Cl-free films, a range of shallow hole traps (within 0.4 eV from the valence band edge) have been measured and their origins have been identified. The influence of these shallow hole traps on the charge transport mechanism and the activation energy of conductivity is discussed.