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4 Acta Physica Polonica A

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Infrared Spectroscopy of Light Impurities in GaSb

100%

Kaczor P. , Kaliński Z. , Jakieła R.

Acta Physica Polonica A

2005

tom 108

nr 4

711-715

In our work we study the doping behaviour of sulphur in Czochralski grown GaSb by means of the high resolution Fourier transform infrared spectroscopy and the secondary ion mass spectroscopy. We have revealed that the sulphur impurity forms an effective mass like donor state bound to the L-minimum of the conduction band. From the far infrared spectrum of this donor we derive the effective band masses of the L band minimum. We also observe local vibrational modes related to the arsenic and phosphorus isoelectronic impurities. From the nearest neighbour isotope splittings of these modes we conclude that the arsenic impurity occupies a tetrahedral substitutional site and the phosphorus impurity - a low symmetry lattice site.

X-Ray Photoelectron Study of Yb-Doped InP

100%

Iwanowski R. J. , Sobczak J. W. , Kaliński Z.

Acta Physica Polonica A

1997

tom 91

nr 4

809-813

X-ray photoelectron spectra of core levels are reported for InP:Yb. Crystalline InP, doped with Yb to a level of 0.5 at.%, was grown by the synthesized solute diffusion method. An analysis of the core-level spectra of the constituent components, i.e. In 3d_{5/2} and P 2p, revealed a minor influence of the surface oxide species, mainly in the phosphate-like form. The spectrum of the Yb 4d core level was also recorded. The energy of the Yb 4d_{3/2} peak was found identical to that in Yb metal, whereas the 4d_{5/2} peak was found to be shifted to higher binding energies. This effect was found comparable to the case of advanced oxidation of Yb thus confirming its high reactivity, even as a bulk dopant. The data give also a rare experimental example of detection of bulk dopant atoms in a semiconductor matrix by X-ray photoelectron spectroscopy at the limit of detectability.

Recombination Processes for Deep Impurity States Degenerate with the Conduction Band

100%

Świątek K. , Godlewski M. , Kaliński Z. , Przybylińska H.

Acta Physica Polonica A

1991

tom 79

nr 2-3

243-246

We report on the studies of autoionization efficiency and the relevant recombination mechanism for Eu^{2+} in Ca_{x}Cd_{1-x}F_{2} depending on the energy level position of Eu^{2+} excited states in respect to the conduction band states.

Absorption Studies of the Sulphur Donor in GaSb

88%

Kaczor P. , Gerrits A. , Dobaczewski L. , Kaliński Z. , Wittlin A.

Acta Physica Polonica A

1995

tom 87

nr 2

399-402

The shallow-deep bistability of the sulphur-related DX centre in GaSb is demonstrated. After photoexcitation of the defect with the near-band gap light the metastable inter-donor transition in the far infrared can be observed. This observation allowed us to evaluate the polaron effective mass and polaron coupling constant for the material.