In this section
@article{Dimitrov:2015:10.1038/ncomms7501,
author = {Dimitrov, SD and Wheeler, S and Niedzialek, D and Schroeder, BC and Utzat, H and Frost, JM and Yao, J and Gillett, A and Tuladhar, PS and McCulloch, I and Nelson, J and Durrant, JR},
doi = {10.1038/ncomms7501},
journal = {Nature Communications},
title = {Polaron pair mediated triplet generation in polymer/fullerene blends},
url = {http://dx.doi.org/10.1038/ncomms7501},
volume = {6},
year = {2015}
}
TY - JOUR
AB - Electron spin is a key consideration for the function of organic semiconductors in light-emitting diodes and solar cells, as well as spintronic applications relying on organic magnetoresistance. A mechanism for triplet excited state generation in such systems is by recombination of electron-hole pairs. However, the exact charge recombination mechanism, whether geminate or nongeminate and whether it involves spin-state mixing is not well understood. In this work, the dynamics of free charge separation competing with recombination to polymer triplet states is studied in two closely related polymer-fullerene blends with differing polymer fluorination and photovoltaic performance. Using time-resolved laser spectroscopic techniques and quantum chemical calculations, we show that lower charge separation in the fluorinated system is associated with the formation of bound electron-hole pairs, which undergo spin-state mixing on the nanosecond timescale and subsequent geminate recombination to triplet excitons. We find that these bound electron-hole pairs can be dissociated by electric fields.
AU - Dimitrov,SD
AU - Wheeler,S
AU - Niedzialek,D
AU - Schroeder,BC
AU - Utzat,H
AU - Frost,JM
AU - Yao,J
AU - Gillett,A
AU - Tuladhar,PS
AU - McCulloch,I
AU - Nelson,J
AU - Durrant,JR
DO - 10.1038/ncomms7501
PY - 2015///
SN - 2041-1723
TI - Polaron pair mediated triplet generation in polymer/fullerene blends
T2 - Nature Communications
UR - http://dx.doi.org/10.1038/ncomms7501
UR - http://hdl.handle.net/10044/1/23389
VL - 6
ER -
Jenny Nelson
Professor of Physics
1007, Huxley Building
South Kensington, London, SW7 2AZ