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Polaron pair mediated triplet generation in polymer/fullerene blends
Stoichko Dimitrov 
,
Scot Wheeler,
Dorota Niedzialek,
Bob C. Schroeder,
Hendrik Utzat,
Jarvist M. Frost,
Jizhong Yao,
Alexander Gillett,
Pabitra S. Tuladhar,
Iain McCulloch,
Jenny Nelson ,
James Durrant
,
Scot Wheeler,
Dorota Niedzialek,
Bob C. Schroeder,
Hendrik Utzat,
Jarvist M. Frost,
Jizhong Yao,
Alexander Gillett,
Pabitra S. Tuladhar,
Iain McCulloch,
Jenny Nelson ,
James Durrant
Nature Communications, Volume: 6, Start page: 6501
Swansea University Authors:
Stoichko Dimitrov , Jenny Nelson , James Durrant
-
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DOI (Published version): 10.1038/ncomms7501
Abstract
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 pai...
| Published in: | Nature Communications |
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| ISSN: | 2041-1723 2041-1723 |
| Published: |
2015
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31796 |
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| Abstract: |
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. |
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| Item Description: |
The author made a substantial contribution to the conception and design of the study; to the organisation of the conduct of the study; to carrying out the study (including acquisition of study data); to analysis and interpretation of study data. The author helped draft the output. |
| College: |
Faculty of Science and Engineering |
| Start Page: |
6501 |