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Photoenhanced Currents within the Range of Weak Light Absorption: Photon Detrapping of Charge Carriers in Anthracene Crystals
Author(s) -
Godlewski J.,
Jarosz G.,
Signerski R.
Publication year - 2001
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 - 10.1002/1521-3951(200107)226:1<185::aid-pssb185>3.0.co;2-e
Subject(s) - exciton , photocurrent , charge carrier , absorption (acoustics) , atomic physics , thermalisation , absorption spectroscopy , two photon absorption , molecular physics , chemistry , photon , electric field , singlet state , condensed matter physics , materials science , physics , optoelectronics , optics , excited state , quantum mechanics , laser
This work deals with photoenhanced currents in organic materials within the long‐wavelength range of absorption outside the singlet‐exciton absorption range. The influence of both photon and triplet exciton‐trapped charge interactions on these currents is considered. The analysis has revealed that for low electric field and thick samples the spectrum of photoenhanced current reflects the triplet‐exciton absorption spectrum, whereas for high electric field and thin samples the photocurrent spectrum does not correspond to this spectrum. The proposed model of photon detrapping of charge carriers from macrotraps with a certain thermalization length enables to explain the experimentally observed decrease of photoenhanced current with the decrease of photon energy.