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Space‐charge‐limited currents and high electric field effect in vitreous selenium films
Author(s) -
Viščakas J.,
Mačkus P.,
Smilga A.
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.19680250132
Subject(s) - electric field , space charge , ionization , atomic physics , current (fluid) , cathode , selenium , trap (plumbing) , field (mathematics) , voltage , steady state (chemistry) , materials science , charge (physics) , physics , chemistry , electron , ion , nuclear physics , mathematics , quantum mechanics , meteorology , pure mathematics , metallurgy , thermodynamics
For vitreous selenium films, from 5 to 57 μm in thickness, dark steady‐state current—voltage characteristics are measured between 1 and 10 3 V. The currents proportional to U 2 d −3 can be interpreted in terms of space‐charge‐limited currents (SCLC) with a single trap level. A steep increase in current at the end of the square‐law region is not caused by trap filling but by field ionization. The mean value of the electric field at the cathode, at which the ionization current predominates over the SCLC is of the order of 1.3 × 10 7 Vm −1 . Restrictions imposed on SCLC by the field ionization of traps are discussed.