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Enhanced open circuit voltage of small molecule acceptors containing angular-shaped indacenodithiophene units for P3HT-based organic solar cells

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Abstract

Angular indaceno[2,1-b:6,5-b′]dithiophene (a-IDT) as an analogue of linear-IDT (l-IDT), in which the central phenyl ring was linked to the β-position of the thiophene ring but fused on its α-position, was designed and exploited via intramolecular annulation. Two A–D–A type small molecule acceptors (SMAs) l-IDTBTRh and a-IDTBTRh, with l-IDT and a-IDT as the central cores, benzothiadiazole (BT) as the π-bridge acceptor segments and 3-ethylrhodanine as the end-capping groups, were synthesized and employed for P3HT-based fullerene free organic solar cells. The geometric shape of the l-IDT and a-IDT subunits plays a pivotal role in governing the optoelectronic properties, the charge mobility, the morphology and the photovoltaic performance of the resulting acceptors. Preliminarily, the device based on P3HT/l-IDTBTRh (1 : 08, w/w) displayed a circuit current density (Jsc) of 8.81 mA cm−2, an open-circuit voltage (Voc) of 0.86 V and a fill factor (FF) of 71.0%, delivering a decent PCE of 5.38%, which is associated with the lower bandgap, the better charge mobility and the morphology. Despite the inferior photovoltaic performance (2.53%), solar cells based on BHJ blends of a-IDTBTRh and P3HT offer a remarkably higher Voc of 0.92 V as a result of the high-lying LUMO energy level (−3.59 eV), representing one of the highest values among the reported IDT-based A–D–A type SMAs for solar cells containing P3HT. The results suggested that introducing an a-IDT segment as the central core into A–D–A type SMAs can effectively increase the LUMO energy level of SMAs, offering an efficient strategy to design non-fullerene small molecule acceptors with high Voc based-P3HT organic solar cells.

Graphical abstract: Enhanced open circuit voltage of small molecule acceptors containing angular-shaped indacenodithiophene units for P3HT-based organic solar cells

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Publication details

The article was received on 12 Sep 2018, accepted on 22 Oct 2018 and first published on 01 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC04608E
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Enhanced open circuit voltage of small molecule acceptors containing angular-shaped indacenodithiophene units for P3HT-based organic solar cells

    H. Huang, B. Xiao, C. Huang, J. Zhang, S. Liu, N. Fu, B. Zhao, T. Qin, E. Zhou and W. Huang, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC04608E

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