Investigation of traps distribution in GaS single crystals by thermally stimulated current measurements

A comparison has been made of thermoluminescence and thermally stimulated current in single crystals of calcium tungstate either doped with impurities or nominally pure but excited by ionizing radiation. Both effects were large in the case of monovalent impurities with glow peaks near 260 °K being characteristic of the impurity and peaks near 160 °K arising from an enhancement of a structure which normally results from radiation damage. Trivalent impurities had a lesser effect with the production of glow peaks near 300 °K. The structures responsible for the prominent glow peaks are suggested to be: 260 °K—monovalent ions in calcium sites, 154/160 °K—oxygen vacancies associated with either a W5+ or a monovalent ion at a calcium site, 300 °K—calcium vacancies. The occupancy of electron and hole traps is found to be related. This relationship is used to deduce information regarding the excitation mechanism for free holes and electrons in calcium tungstate.

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Trapping center parameters in indium selenide single crystals by thermally stimulated current measurements

Journal of Applied Physics ◽

10.1063/1.332246 ◽

1983 ◽

Vol 54 (4) ◽

pp. 1924-1929 ◽

Cited By ~ 49

Author(s):

G. Micocci ◽

A. Rizzo ◽

A. Tepore

Keyword(s):

Single Crystals ◽

Indium Selenide ◽

Trapping Center ◽

Thermally Stimulated Current

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Investigation of Deep Level Defects in Mercuric Iodide by Thermally Stimulated Current Spectroscopy

MRS Proceedings ◽

10.1557/proc-209-541 ◽

1990 ◽

Vol 209 ◽

Author(s):

X.J. Bao ◽

T.E. Schlesinger ◽

R.B. James ◽

A.Y. Cheng ◽

C. Olrtale ◽

...

Keyword(s):

Single Crystals ◽

Deep Level ◽

Metal Contacts ◽

Mercuric Iodide ◽

Heating Rates ◽

Thermally Stimulated Current ◽

Depolarization Current ◽

Pyroelectric Effect ◽

Thermally Stimulated Current Spectroscopy ◽

Defect Levels

ABSTRACTMercuric iodide (HgI2) single crystals deposited with semitransparent Pd, Al and Ag contacts were studied by thermally stimulated current spectroscopy (TSC). Distinct differences were found among spectra obtained friom samples withdifferentmetal contacts, indicating that interactions between the metal contacts and mercuric iodide substrates have strong effects on the deep defect levels in mercuric iodide. The activation energies of some of these defect levels were estimated bytaking TSC spectra with different heating rates. In addition, a pyroelectric effect was observed in Ag-contactedsamplesbythermally stimulated depolarization current technique (TSDC). The implications of these results in device applicationsof mercuric iodide are discussed.

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