Double source optical absorption and spectral photoconductivity measurements in the extrinsic region of semiconductors

A new simple method to reveal deep levels in photosensitive crystals is proposed and demonstrated using a group of samples of SI GaAs. The method is based on ac photoconductivity measurements during linear change of temperature, when the quasi‐Fermi level crosses the impurity and defect levels present in the band gap. More than 10 maxima are observed in the temperature region 6 to 300 K for λexc = 1.03 μm. Results obtained with samples of different producers document the diagnostic potential of this method. Background theory is presented together with numerical simulation to demonstrate its basic features. Dependence of the results on excitation density, applied potential, heating rate, chopping frequency, and excitation photon energy is checked and discussed together with a comparison with transient spectroscopies and TSC method.

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To the problem of decomposition of complex optical spectra into individual contributions

Pastrňák

1987

Czech J Phys

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Double source optical absorption and spectral photoconductivity measurements in the extrinsic region of semiconductors

Cited by 3 publications

References 23 publications

Two-Light-Source Extrinsic Photoconductivity of GaAs:V

Two-Light-Source Extrinsic Photoconductivity of GaAs:V

Thermostimulated Photoconductivity Method. Application to GaAs

To the problem of decomposition of complex optical spectra into individual contributions

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