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Title:The role of local potential minima on charge transport in thin organic semiconductor layers
Authors:ID Pavlica, Egon, Univerza v Novi Gorici (Author)
ID Penumala, Raveendra Babu, Univerza v Novi Gorici (Author)
ID Bratina, Gvido, Univerza v Novi Gorici (Author)
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:We have performed a systematic study of dependence of time-resolved photocurrent on the point of charge excitation within the organic semiconductor channel formed by two coplanar metal electrodes. The results confirm that spatial variation of electric field between the electrodes crucially determines transport of photogenerated charge carriers through the organic layer. Time-of-flight measurements of photocurrent demonstrate that the transit time of photogenerated charge carrier packets drifting between the two electrodes decreases with increasing travelling distance. Such counterintuitive result cannot be reconciled with the spatial distribution of electric field between coplanar electrodes, alone. It is also in contrast to expected role of space-charge screening of external electric field. Supported by Monte Carlo simulations of hopping transport in disordered organic semiconductor layer, we submit that the space-charge screens the external electric field and captures slower charge carriers from the photogenerated charge carrier packet. The remaining faster carriers, exhibit velocity distribution with significantly higher mean value and shorter transit time.
Keywords:Charge transport, Organic semiconductors, Time of flight, Mobility, Traps
Publication version:Author Accepted Manuscript
Year of publishing:2016
Number of pages:32
Numbering:2016
PID:20.500.12556/RUNG-2865-9fd4f3bf-2d3c-e79f-a417-c55d94f24f26 New window
COBISS.SI-ID:4619003 New window
DOI:10.1016/j.orgel.2016.12.038 New window
NUK URN:URN:SI:UNG:REP:FOUDSCTB
Publication date in RUNG:23.12.2016
Views:6721
Downloads:0
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PAVLICA, Egon, PENUMALA, Raveendra Babu and BRATINA, Gvido, 2016, The role of local potential minima on charge transport in thin organic semiconductor layers. Organic Electronics [online]. 2016. Vol. 2016. [Accessed 7 April 2025]. DOI 10.1016/j.orgel.2016.12.038. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=2865
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Record is a part of a journal

Title:Organic Electronics
Year of publishing:2016

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:23.12.2016

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