Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/86606
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dc.titleOn the origin of the quadrant I semicircle in intensity-modulated photocurrent spectra of P3HT:PCBM Bulk heterojunction solar cells: Evidence of degradation-related trap-assisted recombination
dc.contributor.authorSet, Y.T.
dc.contributor.authorHeinemann, M.D.
dc.contributor.authorBirgersson, E.
dc.contributor.authorLuther, J.
dc.date.accessioned2014-10-07T09:52:40Z
dc.date.available2014-10-07T09:52:40Z
dc.date.issued2013-04-25
dc.identifier.citationSet, Y.T., Heinemann, M.D., Birgersson, E., Luther, J. (2013-04-25). On the origin of the quadrant I semicircle in intensity-modulated photocurrent spectra of P3HT:PCBM Bulk heterojunction solar cells: Evidence of degradation-related trap-assisted recombination. Journal of Physical Chemistry C 117 (16) : 7993-8000. ScholarBank@NUS Repository.
dc.identifier.issn19327447
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/86606
dc.description.abstractIntensity-modulated photocurrent spectroscopy (IMPS) characterizes the charge carrier transport in a solar cell by subjecting it to a sinusoidally varying illumination and measuring the resultant photocurrent. The IMPS spectra of certain P3HT:PCBM bulk heterojunction solar cells exhibit a poorly understood feature: A quadrant I semicircle, which implies that the sinusoidal variation of the photocurrent leads that of the illumination in a certain frequency range. To understand the mechanisms underlying this feature, we have adopted a mathematical framework based on drift-diffusion modeling instead of the conventional equivalent circuit approach. By incorporating the effects of traps into the mathematical model and conducting targeted experiments, we have demonstrated that the quadrant I semicircle arises from degradation-related trap states behaving as recombination centers. Our analysis of the device's intrinsic mechanisms indicates that the trap-assisted recombination can have a time scale that is at least one order of magnitude slower than that of the carrier extraction mechanism; such a mismatch can generate the observed quadrant I semicircle. © 2013 American Chemical Society.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1021/jp310841v
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.contributor.departmentMATERIALS SCIENCE AND ENGINEERING
dc.description.sourcetitleJournal of Physical Chemistry C
dc.description.volume117
dc.description.issue16
dc.description.page7993-8000
dc.identifier.isiut000318211200005
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