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Issue 1, 2014
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Charge generation and transport in efficient organic bulk heterojunction solar cells with a perylene acceptor

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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.

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

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Publication details

The article was received on 23 Jul 2013, accepted on 28 Oct 2013 and first published on 29 Oct 2013


Article type: Paper
DOI: 10.1039/C3EE42484G
Citation: Energy Environ. Sci., 2014,7, 435-441
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    Charge generation and transport in efficient organic bulk heterojunction solar cells with a perylene acceptor

    R. Shivanna, S. Shoaee, S. Dimitrov, S. K. Kandappa, S. Rajaram, J. R. Durrant and K. S. Narayan, Energy Environ. Sci., 2014, 7, 435
    DOI: 10.1039/C3EE42484G

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