Fine-tuning the side-chains of non-fullerene small molecule acceptors to match with appropriate polymer donors

Side-chain engineering of donor and acceptor materials is an important topic in the field of organic photovoltaics. The influence of side-chains in active layer molecules on the corresponding photovoltaic device performances is still elusive, especially for the devices based on non-fullerene small m...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (18), p.8586-8594
Main Authors: Chang, Meijia, Wang, Yunchuang, Yi, Yuan-Qiu-Qiang, Ke, Xin, Wan, Xiangjian, Li, Chenxi, Chen, Yongsheng
Format: Article
Language:English
Subjects:
Absorption spectra
Acceptor materials
Chemical synthesis
Devices
Donor materials
Energy levels
Fullerenes
Malononitrile
Molecular chains
Photovoltaic cells
Photovoltaics
Solar cells
Tuning
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Summary:Side-chain engineering of donor and acceptor materials is an important topic in the field of organic photovoltaics. The influence of side-chains in active layer molecules on the corresponding photovoltaic device performances is still elusive, especially for the devices based on non-fullerene small molecule acceptors. In this work, we designed and synthesized two non-fullerene acceptors ( IDTT-BH and IDTT-OBH ) using an indacenodithieno[3,2- b ]thiophene ( IDTT ) moiety as the central building block and (2-3-oxo-2,3-dihydro-1 H -cyclopenta[ b ]naphthalen-1-ylidene)malononitrile ( NINCN ) as the end-group, which have similar energy levels and optical absorption spectra, and differ in the side-chains. We systematically investigated the effect of the side-chains on the device performance based on these two non-fullerene acceptors pairing with different donor materials. For the devices with J71 and PDCBT as donor materials, IDTT-BH showed better PCEs of 11.05% and 10.35%, respectively. Notably, 10.35% efficiency is among the top values in PDCBT -based OSCs. While, the devices based on PBDB-T : IDTT-OBH showed a better PCE of 10.93% than that of IDTT-BH based devices. It was found that the side-chains of non-fullerene acceptors have an effect on tuning the morphology of blend films and thus affect the photovoltaic performance, and different donor materials should be paired with the acceptors with the most suitable side-chains to achieve the best photovoltaic performance. Side-chain engineering of donor and acceptor materials is an important topic in the field of organic photovoltaics.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta00764k