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A2-A1-D-A1-A2 type non-fullerene acceptors based on methoxy substituted benzotriazole with three different end-capped groups for P3HT-based organic solar cells

Abstract

In the last three years, A2-A1-D-A1-A2 skeleton is increasingly popular in the design of non-fullerene acceptors (NFAs), which could particularly match well with the classic p-type polymer of poly(3-hexylthiophene) (P3HT). In this manuscript, we successfully synthesized three NFAs with this skeleton and named as BTA100, BTA101 and BTA103 , where BTA units were substituted by methoxy groups and used as the middle electron-accepting unit (A1). To finetune the energy levels of final BTA-based NFAs, three different electron-deficient building blocks, thiazolidine-2,4-dione (TD), rhodanine (R) and 2-(1,1-dicyanomethylene)rhodanine (RCN), were used as the end groups (A2) respectively. The introduction of methoxy groups into BTA can upshift the lowest unoccupied molecular orbital (LUMO) energy level of NFAs and realize a high open-circuit voltage (Voc) organic solar cells. In addition, O atom has a weak interaction with S atom in the neightbouring thiophene ring, which might be able to facilitate the intramolecular charge transfer. The organic solar cells (OSCs) device based on P3HT:BTA103 shows a high PCE of 5.31% with VOC of 0.94 V, JSC of 8.56 mA·cm-2 and FF of 0.66. In addition, it is worthy noted that the Voc of P3HT:BTA100 arrived 1.34V, which is one of the highest values for P3HT based solar cells. These results indicate that RCN is also an effective end group to construct NFAs and methoxy substitution is a simple method to improve the Voc for P3HT-based OSC devices.

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Publication details

The article was received on 09 Aug 2018, accepted on 10 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC03963A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    A2-A1-D-A1-A2 type non-fullerene acceptors based on methoxy substituted benzotriazole with three different end-capped groups for P3HT-based organic solar cells

    E. Zhou, Q. Zhang, B. Xiao, M. Du, G. Li and A. Tang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03963A

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