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Study of the Effect of an Electric Field on Trap Filling in CdS Single Crystals by the Use of Thermally Stimulated Currents
Author(s) -
Kirov K.,
Zhelev V.
Publication year - 1965
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19650080203
Subject(s) - trap (plumbing) , cathode , electric field , anode , current (fluid) , electron , voltage , materials science , atomic physics , analytical chemistry (journal) , condensed matter physics , physics , chemistry , electrode , thermodynamics , quantum mechanics , chromatography , meteorology
Thermally stimulated currents (T.S.C.) in CdS are measured for electric fields of 10 to 10 4 V/cm and are found, in general, to change linearly. When trap filling is accomplished not by illumination, but with electrons injected from the cathode, the T. S. C.‐maximum depends on the voltage, according to the law I max ∼ U n , where n varies from 3 to 6 for the various crystals. It is concluded that the fields at which measurements are made have no significant effect on trap emptying. T.S.C. are also measured at various voltages after the initial application of a higher voltage, and these measurements show a strong increase in the dark current and a negative resistance. It is, therefore, concluded that the steep rise of the dark current is not due to trap emptying or to the complete filling of traps. The most probable cause for it is the injection of holes from the anode.