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Non‐Ohmic Behaviour in CdS Acousto‐Electric Oscillators
Author(s) -
Janus H. M.
Publication year - 1969
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.19690360138
Subject(s) - electric field , ohmic contact , conductivity , condensed matter physics , current (fluid) , electrical resistivity and conductivity , physics , materials science , electrode , quantum mechanics , thermodynamics
In thin plane parallel photoconducting CdS platelets the current is observed to deviate from the ohmic value also outside the electric field range for net round trip gain in the longitudinal wave configuration. A N‐type negative differential conductivity is observed for pulsed as well as for CW operation. Domain formation may take place and give rise to low‐frequency current oscillations superposed on the well known high‐frequency modes of the acousto‐electric oscillator. The negative differential conductivity is most likely ascribed to field‐dependent free carrier trapping though acousto‐electric effects may also be important.