Bakulin, AA;
Dimitrov, SD;
Rao, A;
Chow, PCY;
Nielsen, CB;
Schroeder, BC;
McCulloch, I;
... Friend, RH; + view all
(2013)
Charge-Transfer State Dynamics Following Hole and Electron Transfer in Organic Photovoltaic Devices.
Journal of Physical Chemistry Letters
, 4
(1)
pp. 209-215.
10.1021/jz301883y.
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Abstract
The formation of bound electron–hole pairs, also called charge-transfer (CT) states, in organic-based photovoltaic devices is one of the dominant loss mechanisms hindering performance. Whereas CT state dynamics following electron transfer from donor to acceptor have been widely studied, there is not much known about the dynamics of bound CT states produced by hole transfer from the acceptor to the donor. In this letter, we compare the dynamics of CT states formed in the different charge-transfer pathways in a range of model systems. We show that the nature and dynamics of the generated CT states are similar in the case of electron and hole transfer. However the yield of bound and free charges is observed to be strongly dependent on the HOMOD-HOMOA and LUMOD-LUMOA energy differences of the material system. We propose a qualitative model in which the effects of static disorder and sampling of states during the relaxation determine the probability of accessing CT states favorable for charge separation.
| Type: | Article |
|---|---|
| Title: | Charge-Transfer State Dynamics Following Hole and Electron Transfer in Organic Photovoltaic Devices |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/jz301883y |
| Publisher version: | https://doi.org/10.1021/jz301883y |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | charge separation, charge trapping, conjugated polymers, IR spectroscopy, organic solar cells, ultrafast spectroscopy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10048391 |
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