Photocurrent and Surface Photovoltage Spectroscopy Investigations of CdTe-Based Compounds

Photocurrent and Surface Photovoltage Spectroscopy Investigations of CdTe-Based Compounds

The potentiality of photocurrent (PC) and surface photovoltage spectroscopy (SPS) analyses in the determination of the band gap of CdTe-based ternary alloys was investigated. Both methods can detect band-to-band and defect state-to-band transitions. The role played by the surface states in both expe...

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Veröffentlicht in:IEEE transactions on nuclear science 2007-10, Vol.54 (5), p.1719-1722
Hauptverfasser: Cavallini, A., Castaldini, A., Cavalcoli, D., Fraboni, B.
Format: Artikel
Sprache:eng
Schlagworte:
Band spectra
Charge trapping
deep levels
Detectors
Electrodes
Energy levels
Optical materials
Optical noise
Optical surface waves
Photoconductivity
Photocurrent
Photoelectric effect
Photonic band gap
Photovoltages
Polycarbonates
radiation detectors
Spark plasma sintering
Spectroscopy
Spontaneous emission
Temperature
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Zusammenfassung:The potentiality of photocurrent (PC) and surface photovoltage spectroscopy (SPS) analyses in the determination of the band gap of CdTe-based ternary alloys was investigated. Both methods can detect band-to-band and defect state-to-band transitions. The role played by the surface states in both experimental methods has been studied since it may significantly alter the results. The below-band gap energy levels have also been detected by PC and SPS and the different information that can be obtained in the two cases has been discussed. The results obtained by PC and SPS have been compared in order to extract the contribution of the surface and bulk states.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2007.905171