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Theory of CdS‐Type Superlinear Photoconductivity Due to Excitation from Localized Levels
Author(s) -
Cardon F.
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.19650120225
Subject(s) - excitation , electron , photoconductivity , conduction band , quenching (fluorescence) , fermi level , atomic physics , range (aeronautics) , thermal conduction , condensed matter physics , intensity (physics) , free electron model , physics , quasi fermi level , materials science , optics , fluorescence , quantum mechanics , composite material
Abstract The free‐electron versus light‐intensity relationship in the superlinear range is calculated for a system consisting of two levels below the Fermi level and either one level or a continuous distribution, above it. The excitation of electrons from localized levels to the conduction band is also considered. It is shown that with respect to the inter‐band case two new possible values for lower break points are obtained, and that, in order to get superlinearity, excitations have to take place from the centres with smallest capture cross‐section for electrons. Values for upper break points due to thermal and optical quenching are unchanged. It is also shown that, in some cases, superlinearity exists for “localized level to conduction band” excitations and not for inter‐band excitations.