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Highly efficient fullerene and non-fullerene based ternary organic solar cells incorporating a new tetrathiocin-cored semiconductor

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journal contribution
posted on 28.06.2019, 13:43 authored by Lethy Krishnan Jagadamma, Rupert G.D. Taylor, Alexander L. Kanibolotsky, Muhammad Tariq Sajjad, Iain WrightIain Wright, Peter N. Horton, Simon J. Coles, Ifor D. W. Samuel, Peter J. Skabara
A new dual-chain oligothiophene-based organic semiconductor, EH-5T-TTC, is presented. The molecule contains two conjugated chains linked by a fused tetrathiocin core. X-ray crystallography reveals a boat conformation within the 8-membered sulfur heterocycle core and extensive p–p and intermolecular sulfur–sulfur interactions in the bulk, leading to a 2-dimensional structure. This unusual molecule has been studied as a ternary component in organic solar cell blends containing the electron donor PTB7-Th and both fullerene (PC71BM) and non-fullerene acceptors ITIC and EH-IDTBR. By incorporating EH-5TTTC as a ternary component, the power conversion efficiency of the binary blends containing nonfullerene acceptor increases by 17% (from 7.8% to 9.2%) and by 85% for the binary blend with fullerene acceptor (from 3.3% to 6.3%). Detailed characterisation of the ternary blend systems implies that the ternary small molecule EH-5T-TTC functions differently in polymer:fullerene and polymer:non-fullerene blends and has dual functions of morphology modification and complementary spectral absorption.

Funding

We thank the EPSRC for funding under grants EP/L012200/1 and EP/L012294/1.

History

School

  • Science

Department

  • Chemistry

Published in

Sustainable Energy & Fuels

Volume

3

Issue

8

Pages

2087 - 2099

Citation

KRISHNAN JAGADAMMA, L., 2019. Highly efficient fullerene and non-fullerene based ternary organic solar cells incorporating a new tetrathiocin-cored semiconductor. Sustainable Energy & Fuels, 3 (8), pp.2087-2099

Publisher

Royal Society of Chemistry (RSC)

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

03/06/2019

Publication date

2019-06-18

Notes

This is an Open Access Article. It is published by RSC under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

eISSN

2398-4902

Language

en

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