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Charge generation and transport in efficient organic bulk heterojunction solar cells with a perylene acceptor

Ravichandran Shivanna, Safa Shoaee, Stoichko Dimitrov Orcid Logo, Sunil Kumar Kandappa, Sridhar Rajaram, James Durrant Orcid Logo, K. S. Narayan

Energy & Environmental Science, Volume: 7, Issue: 1, Pages: 435 - 441

Swansea University Authors: Stoichko Dimitrov Orcid Logo, James Durrant Orcid Logo

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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...

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Published in: Energy & Environmental Science
ISSN: 1754-5692 1754-5706
Published: 2014
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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.
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: College of Engineering
Issue: 1
Start Page: 435
End Page: 441