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Photoionization of Triplet Excitons in Tetracene Crystals
Author(s) -
Schlotter P.,
Kalinowski J.,
Bässler H.
Publication year - 1977
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.2220810212
Subject(s) - tetracene , excited state , photoionization , atomic physics , singlet fission , ionization , exciton , photocurrent , triplet state , chemistry , materials science , physics , ion , photochemistry , anthracene , condensed matter physics , optoelectronics , organic chemistry
Transient photocurrents in crystalline tetracene excited by intense ruby laser pulses are investigated. A cubic relationship between charge carrier density and light intensity is observed. The dominant carrier generation mechanism is photoionization of triplet excitons produced by fission of two‐photon‐excited singlet states. The ionization cross‐section is found to be (5 ± 2) × 10 −22 cm −2 and the calculated autoionization efficiency of the excited triplet state is about 10 −3 . From the time response of the photocurrent pulses a rate constant γeh = (1.0 ± 0.5) × 10 −6 cm 3 s −1 for electron‐hole recombination follows.