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Title: Charge generation and transport in efficient organic bulk heterojunction solar cells with a perylene acceptor
Authors: Shivanna, Ravichandran
Shoaee, Safa
Dimitrov, Stoichko
Kandappa, Sunil Kumar
Rajaram, Sridhar
Durrant, James R.
Narayan, K. S.
Keywords: Chemistry
Energy & Fuels
Chemical Engineering
Environmental Sciences
Transient Absorption-Spectroscopy
Photovoltaic Cells
Blend Films
Issue Date: 2014
Publisher: Royal Society of Chemistry
Citation: Shivanna, R; Shoaee, S; Dimitrov, S; Kandappa, SK; Rajaram, S; Durrant, JR; Narayan, KS, Charge generation and transport in efficient organic bulk heterojunction solar cells with a perylene acceptor. Energy & Environmental Science 2014, 7 (1) 435-441,
Energy & Environmental Science
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 us-decay dynamics. A power conversion efficiency of 3.2% is achieved for devices with 50 : 50% by weight compositional ratio of polymer and TP.
Description: Restricted Access
ISSN: 1754-5692
Appears in Collections:Research Articles (Narayan K. S.)

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