Mechanisms of spin-dependent dark conductivity in films of a soluble fullerene derivative under bipolar injection

Update Item Information
Publication Type pre-print
School or College College of Science
Department Physics
Creator Lupton, John Mark
Other Author Morishita, H.; Baker, W. J.; Waters, D. P.; Baarda, R.; Boehme, C.
Title Mechanisms of spin-dependent dark conductivity in films of a soluble fullerene derivative under bipolar injection
Date 2014-01-01
Description We report room-temperature pulsed electrically detected magnetic resonance measurements of the dark conductivity of films of the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) under bipolar (electron-hole) and unipolar (electron-rich) injection conditions. Directly after material deposition, no detectable spin-dependent processes are observed, yet after storage under ambient conditions for more than a day, two distinct spin-dependent mechanisms are found under bipolar injection, suggesting the involvement of degradation-induced electronic states. Spin-Rabi beat oscillation measurements show that at least one of these processes is due to weakly spin-coupled pairs with s = 1/2. The absence of these signals when hole injection is impeded by a barrier suggests that they are due to spin-dependent recombination. The presence of recombination confirms that fullerenes are both electron and hole acceptors, with important consequences for the design, operation, and understanding of plastic solar cells. Electron-hole recombination can occur within homogeneous domains of either the donor or the acceptor of the bulk heterojunction structure, constituting an important dissipative channel in addition to the established interfacial bimolecular recombination loss.
Type Text
Publisher American Physical Society
Volume 89
Issue 12
First Page 125311-1
Last Page 125311-7
Language eng
Bibliographic Citation Morishita, H., Baker, W. J., Waters, D. P., Baarda, R., Lupton, J. M., & Boehme, C. (2014). Mechanisms of spin-dependent dark conductivity in films of a soluble fullerene derivative under bipolar injection. Physical Review B - Condensed Matter and Materials Physics, 89(12), 125311-1-125311-7.
Rights Management (c) American Physical Society http://dx.doi.org/10.1103/PhysRevB.89.125311 PACS.
Format Medium application/pdf
Format Extent 1,337,072 bytes
Identifier uspace,18651
ARK ark:/87278/s6zd1c08
Setname ir_uspace
ID 712547
Reference URL https://collections.lib.utah.edu/ark:/87278/s6zd1c08
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