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Field Effect on Photocarriers in Copper Phthalocyanine Single Crystals
Author(s) -
Devaux P.,
Schott M.
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.19680270121
Subject(s) - photoconductivity , exciton , copper , charge carrier , phthalocyanine , excitation , materials science , electric field , ionization , range (aeronautics) , perpendicular , analytical chemistry (journal) , molecular physics , condensed matter physics , chemistry , optoelectronics , ion , physics , nanotechnology , geometry , organic chemistry , mathematics , composite material , quantum mechanics , chromatography , metallurgy
The photoconductivity of copper phthalocyanine single crystals changes when a high electric field is applied perpendicular to the illuminated surface. The ionization rate of excitons at the surface and the lifetime of the generated carriers change as a result of the variation of the surface charge; lifetime variation alone cannot explain the experimental results. In all the crystals studied the majority carriers for photoconduction are holes at 300°K. The densities of surface acceptors are higher than 10 11 cm −2 . A different photogeneration mechanism exists for the bulk throughout the investigated range from 3650 to 8150 Å. It dominates, at least under intense excitation, for light being absorbed only weakly.