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Persistence time of charge carriers in defect states of molecular semiconductors
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McMahon, David Paul and Troisi, Alessandro (2011) Persistence time of charge carriers in defect states of molecular semiconductors. Physical Chemistry Chemical Physics, Vol.13 (No.21). p. 10241. doi:10.1039/c1cp20192a ISSN 1463-9076.
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Official URL: http://dx.doi.org/10.1039/C1CP20192A
Abstract
Charge carriers in organic crystals are often trapped in point defects. The persistence time of the charge in these defect states is evaluated by computing the escape rate from this state using non-adiabatic rate theory. Two cases are considered (i) the hopping between separate identical defect states and (ii) the hopping between a defect state and the bulk (delocalized) states. We show that only the second process is likely to happen with realistic defect concentrations and highlight that the inclusion of an effective quantum mode of vibration is essential for accurate computation of the rate. The computed persistence time as a function of the trap energy indicates that trap states shallower than 0.3 eV cannot be effectively investigated with some slow spectroscopic techniques such as THz spectroscopy or EPR commonly used to study the nature of excess charge in semiconductors.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Semiconductors, Molecular crystals, Charge transfer, Charge transfer devices (Electronics) | ||||
Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||
Publisher: | Royal Society of Chemistry | ||||
ISSN: | 1463-9076 | ||||
Official Date: | 2011 | ||||
Dates: |
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Volume: | Vol.13 | ||||
Number: | No.21 | ||||
Page Range: | p. 10241 | ||||
DOI: | 10.1039/c1cp20192a | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), European Research Council (ERC) |
Data sourced from Thomson Reuters' Web of Knowledge
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