Skip to main content

Vibrational coherence probes the mechanism of ultrafast electron transfer in polymer–fullerene blends

Author(s): Song, Yin; Scholes, Gregory D.; Kee, Tak W.; Pensack, Ryan D.; Clafton, Scott N.

To refer to this page use:
Abstract: The conversion of photoexcitations into charge carriers in organic solar cells is facilitated by the dissociation of excitons at the donor/acceptor interface. The ultrafast timescale of charge separation demands sophisticated theoretical models and raises questions about the role of coherence in the charge-transfer mechanism. Here, we apply two-dimensional electronic spectroscopy to study the electron transfer process in poly(3-hexylthiophene)/PCBM (P3HT/PCBM) blends. We report dynamics maps showing the pathways of charge transfer that clearly expose the significance of hot electron transfer. During this ultrafast electron transfer, vibrational coherence is directly transferred from the P3HT exciton to the P3HT hole polaron in the crystalline domain. This result reveals that the exciton converts to a hole with a similar spatial extent on a timescale far exceeding other photophysical dynamics including vibrational relaxation. © 2014 Macmillan Publishers Limited. All rights reserved.
Publication Date: Dec-2014
Electronic Publication Date: 12-Sep-2014
Citation: Song, Yin, Clafton, Scott N., Pensack, Ryan D., Kee, Tak W., Scholes, Gregory D. (2014). Vibrational coherence probes the mechanism of ultrafast electron transfer in polymer–fullerene blends. Nature Communications, 5 (1), 10.1038/ncomms5933
DOI: doi:10.1038/ncomms5933
EISSN: 2041-1723
Pages: 5:4933-1 - 4933-7
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.
Notes: Nature Communications. Volume 5, February 2015, Article number 4933.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.