Abstract
Semi-insulating and n-type conductor titanium (Ti) doped CdZnTe has been investigated by deep level transient spectroscopy, deep level optical spectroscopy and photoinduced current transient spectroscopy. A main electron trap at 0.82 eV is detected and its electrical and optical characteristics are given. The σno optical cross section spectrum of this level exhibits a resonance band attributed to the internal transition of the Ti2+ ion in CdZnTe. Starting from this identification, this deep trap is formally proposed to be the Ti2+/Ti3+ single donor level. The semi-insulating properties of the CdZnTe:Ti are interpreted in relation to this deep donor. Finally, the impact of the optical cross sections σno and σpo of this level on the photorefractive behavior of CdZnTe crystal is also discussed.
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