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Deep level transient spectroscopy (DLTS, D.V. Lang, J. Appl. Phys. 45, 3023 (1974)) is a very sensitive method to study deep levels in semiconductors. The method is based on the capacitance change of a reverse biased diode when deep levels emit their carriers after they were charged by a forward bias pulse. The emission rate is temperature dependent and characteristic for each type of defect. From the temperature dependence of the emission rate the activation energy of a deep level can be deduced.
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DDLTS (double correlation deep level transient spectroscopy, H.Lefevre and M. Schulz, Appl. Phys. 12, 45 (1977)) is a variation of DLTS to get field dependent emission data and/or depth profiles of a deep level.
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There are many more varieties which are widely used, like e.g. deep level optical spectroscopy (DLOS, A. Chantre et al., Phys. Rev. B 23, 5335 (1981)), or relatively unknown, like e.g. Acousto-Electric Deep Level Transient Spectroscopy (AE-DLTS) or Q-DLTS
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A good book on DLTS and related techniques is "The Electrical Characterisation of Semiconductors: Majority Carriers and Electron States" by P. Blood and J.W. Orton, Academic Press London (1992) (ISBN 0-12-528627-9)
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