Journal article 997 views
Charge generation and transport in efficient organic bulk heterojunction solar cells with a perylene acceptor
,
Sunil Kumar Kandappa,
Sridhar Rajaram,
James Durrant ,
K. S. Narayan
Energy & Environmental Science, Volume: 7, Issue: 1, Pages: 435 - 441
Swansea University Authors:
Stoichko Dimitrov , James Durrant
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DOI (Published version): 10.1039/c3ee42484g
Abstract
The origin of high current density in efficient non-fullerene based bulk heterojunction (BHJ) organic solar cells employing a non-planar perylene dimer (TP) as an electron acceptor and a thiophene based donor polymer PBDTTT-CT is investigated using electrical and optical techniques. Photoluminescenc...
| Published in: | Energy & Environmental Science |
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| ISSN: | 1754-5692 1754-5706 |
| Published: |
2014
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31798 |
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| Abstract: |
The origin of high current density in efficient non-fullerene based bulk heterojunction (BHJ) organic solar cells employing a non-planar perylene dimer (TP) as an electron acceptor and a thiophene based donor polymer PBDTTT-CT is investigated using electrical and optical techniques. Photoluminescence measurements reveal almost complete quenching of both the donor and acceptor excitons, indicating efficient electron and hole transfer processes. The nanomorphology of the films shows fine mixing of the donor polymer and TP at 50 : 50% weight ratio with a photon to current conversion efficiency (IPCE) of 45% in the visible regime. At the donor–acceptor interface, both polymer and TP excitons undergo fast dissociation with similar time scales of a few picoseconds. The magnitude of the polaron yield of PBDTTT-CT:TP blends is observed to be comparable to that of PBDTTT-CT:PC70BM blends and exhibits similar μs-decay dynamics. A power conversion efficiency of 3.2% is achieved for devices with 50 : 50% by weight compositional ratio of polymer and TP. |
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| Item Description: |
The author made a substantial contribution 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 |
| Issue: |
1 |
| Start Page: |
435 |
| End Page: |
441 |