Determination of deep trapping center parameters in as-grown Tl2Ga2S3Se layered crystals

We have carried out thermally stimulated current (TSC) measurements on as-grown Tl 2 Ga 2 S 3 Se layered single crystals in the temperature range 10–60 K with different heating rates of 0.6–1.5 K s1. The data were analyzed by curve fitting, initial rise, and peak shape methods. The results were in good agreement with each other. Experimental evidence was obtained for trapping center in Tl 2 Ga 2 S 3 Se crystal with activation energy of 11 meV. The capture cross section and concentration of the traps were found to be 1.5 × 10-23 cm 2 and 1.44 × 1010 cm -3, respectively. Analysis of the TSC data at different light excitation temperatures leads to a value of 18meV/decade for the traps distribution.

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Trapping center parameters of TlGaSe2 layered crystals

Physica B Condensed Matter ◽

10.1016/j.physb.2003.09.266 ◽

2004 ◽

Vol 344 (1-4) ◽

pp. 249-254 ◽

Cited By ~ 19

Author(s):

N.S. Yuksek ◽

H. Kavas ◽

N.M. Gasanly ◽

H. Ozkan

Keyword(s):

Trapping Center ◽

Layered Crystals

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ChemInform Abstract: Extraction-Photometric Determination of Indium with 8-Quinolinol in Layered Crystals of the Type AV 2BVI 3.

ChemInform ◽

10.1002/chin.198910358 ◽

1989 ◽

Vol 20 (10) ◽

Author(s):

J. SRAMKOVA ◽

S. KOTRLY ◽

Y. KALISCHOVA

Keyword(s):

Photometric Determination ◽

Layered Crystals

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Determination of carrier effective mass, impurity energy levels, and compensation ratio in Ga4Se3S layered crystals by Hall effect measurements

physica status solidi (a) ◽

10.1002/pssa.200824105 ◽

2008 ◽

Vol 205 (7) ◽

pp. 1662-1665 ◽

Cited By ~ 3

Author(s):

A. F. Qasrawi ◽

N. M. Gasanly

Keyword(s):

Hall Effect ◽

Effective Mass ◽

Energy Levels ◽

Compensation Ratio ◽

Carrier Effective Mass ◽

Layered Crystals ◽

Hall Effect Measurements

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Extraction-photometric determination of indium with 8-quinolinol in layered crystals of the type A2VB3VI

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19883029 ◽

1988 ◽

Vol 53 (12) ◽

pp. 3029-3039 ◽

Cited By ~ 7

Author(s):

Jitka Šrámková ◽

Stanislav Kotrlý ◽

Yvona Kalischová

Keyword(s):

Ph Effect ◽

Photometric Determination ◽

Chloroform Extract ◽

Extraction Yield ◽

Relative Standard ◽

Chloroform Phase ◽

The Matrix ◽

Layered Crystals ◽

Glass Cell

A method for determining indium in milligram samples of indium-doped crystals of bismuth telluride is described. The pH effect of the aqueous phase (Vaq = 40 ml) on the extraction yield is examined, also by considering the results computed with the data so far published. In a single extraction at pH 3·6-4·2 (acetate buffer) the tris(8-quinolinolato)indium(III) chelate is quantitatively transferred to the chloroform phase (Vorg = 10 ml). Bismuth present in excess is masked with thiosulfate. The absorbance of the chloroform extract is measured at 400 nm in a glass cell of 10-mm path-length (or in a 50-mm cell when m(In) < 20 μg). A blank extraction is carried out simultaneously with the use of a solution of pure Bi2Te3 and taken as reference. The calibration within the range of 10 - 130 μg of In(III) is performed by adding a standard indium(III) solution to the matrix solution obtained by dissolving pure Bi2Te3. The accuracy of the method has been checked by analysis of polycrystalline reference materials of known composition. The method is applicable for the analysis of milligram samples containing 0·6 - 5% of indium, with a relative standard deviation of 1 - 4%.

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