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Optical Generation of Charge Carriers in Solid and Liquid Benzene (C 6 H 6 )
Author(s) -
Hirth H.
Publication year - 1972
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.2220520106
Subject(s) - excitation , exciton , annihilation , melting point , charge carrier , atomic physics , electric field , materials science , electron , auger effect , auger , molecular physics , free electron model , analytical chemistry (journal) , condensed matter physics , chemistry , physics , optoelectronics , quantum mechanics , composite material , chromatography
Free electrons and holes have been generated optically near one electrode via exciton states. At high excitation strengths the charge is proportional to the square of the illumination. At low excitation levels it is proportional to the illumination. In solid benzene the quadratic process dominates. Approaching the melting point this process decreases. At the melting point and in the liquid only the linear process remains. The dependence of these two processes has been investigated as a function of the electric field and the temperature. The quadratic process can be explained by a mutual annihilation of two excitons in the bulk of the material and the linear process by an Auger type recombination of an exeiton at the surface.