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Photoconduction in CdS Crystals Generated by a Modulated Electron Beam
Author(s) -
Stössel W.,
Zimmermann W.
Publication year - 1968
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.19680300137
Subject(s) - photocurrent , irradiation , relaxation (psychology) , cathode ray , electron , photoconductivity , intensity (physics) , electron beam processing , materials science , atomic physics , beam (structure) , molecular physics , analytical chemistry (journal) , chemistry , optics , optoelectronics , physics , psychology , social psychology , chromatography , nuclear physics , quantum mechanics
Abstract A modulated photocurrent in CdS crystals is obtained by irradiation with an intensity modulated electron beam. The experimental set‐up for the irradiation is described. From the frequency dependence of the ac photocurrent a relaxation time τ R is defined. τ R decreases with increasing irradiation intensity B . At complete filling of the traps it reaches the value of the free electron lifetime τ. From the dependence τ R ( B ) the approximate depth and the concentration of the traps, which are involved in the relaxation processes, are determined to E c − E H = 0.215 eV and H = 8.5 × 10 14 cm −3 .