Magnetic field modulation of recombination processes in organic photovoltaics

Booker, E. P., Bayliss, S. L. , Jen, A., Rao, A. and Greenham, N. C. (2019) Magnetic field modulation of recombination processes in organic photovoltaics. IEEE Journal of Photovoltaics, 9(2), pp. 460-463. (doi: 10.1109/JPHOTOV.2018.2889574)

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Polymer-Fullerene photovoltaics have potential in small-scale power production, but low open-circuit voltages limit their efficiency. Understanding the processes affecting the charge recombination rate is key to increasing device efficiency through optimizing open-circuit voltage. Most of the polymer-fullerene systems have an intramolecular triplet exciton state lower in energy than the interfacial charge-transfer state, and its formation can provide a terminal recombination pathway that may limit device performance. We used magnetic fields to modulate intersystem crossing in a prototypical system and monitored the effect on the open-circuit voltage to infer changes in the steady-state carrier density and hence in the net recombination rate constant. We analyzed these effects using density matrix modeling and quantified the various recombination rate constants for a working device.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Bayliss, Dr Sam
Authors: Booker, E. P., Bayliss, S. L., Jen, A., Rao, A., and Greenham, N. C.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Journal of Photovoltaics
ISSN (Online):2156-3403
Published Online:18 January 2019

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