Novel Small Four-armed Molecules with Triphenylamine-bridged Structure for Organic Solar Cells Featuring High Open-circuit Voltage

doi:10.1007/s40242-019-9179-1

Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (6): 1032-1039.doi: 10.1007/s40242-019-9179-1

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Novel Small Four-armed Molecules with Triphenylamine-bridged Structure for Organic Solar Cells Featuring High Open-circuit Voltage

HE Xiaodong¹, ZHU Jianling², YIN Lunxiang¹, XIE Bao¹, LI Kechang², LI Yanqin¹

1. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China;
2. College of Chemistry, Jilin University, Changchun 130012, P. R. China

Received:2019-06-26 Revised:2019-08-13 Online:2019-12-01 Published:2019-11-29
Contact: LI Yanqin E-mail:liyanqin@dlut.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21102013) and the Fundamental Funds for the Central Universities, China(No.DUT16ZD205).

Abstract

Abstract: In view of few attention on star-shaped molecules containing triphenylamine(TPA) unit as π-linker, a series of small four-armed molecules, consisting of octyloxy-substituted 2,1,3-benzothiadiazole(DOBT) or 4-octyl-2-thienyl functionalized DOBT as the core, TPA as π-bridge and 4-methylphenyl or 4-methoxyphenyl groups as terminal units, was designed and synthesized. The effects of π-bridges and substitute groups on molecular photoelectric performance and photovoltaic performance were fully explored. With the help of the additional thiophene-linkers incorporation, 3-octylthienyl substituted molecule with end-capping 4-methylphenyl(T-BTTPAM) and 3-octylthienyl substituted molecule with end-capping 4-methoxyphenyl(T-BTTPAOM) showed stronger and broader absorption, as well as higher charge mobilities compared to the molecules without thiophene-linkers(BTTPAM and BTTPAOM). Additionally, changing substitute groups from methyl to methoxy helped BTTPAOM and T-BTTPAOM achieve better absorption properties than BTTPAM and T-BTTPAM, respectively. When paired with PC₆₁BM as the electron acceptor to fabricate solution-processed photovoltaic devices, the four materials gave high open-circuit voltage(V_oc) values over 0.90 V. These results demonstrate that our materials are promising candidates as donor materials for organic solar cells(OSCs), and further device optimization is in progress in our laboratory.

Key words: Triphenylamine, Four-armed structure, High open-circuit voltage, Organic solar cell, Small-molecule donor

HE Xiaodong, ZHU Jianling, YIN Lunxiang, XIE Bao, LI Kechang, LI Yanqin. Novel Small Four-armed Molecules with Triphenylamine-bridged Structure for Organic Solar Cells Featuring High Open-circuit Voltage[J]. Chemical Research in Chinese Universities, 2019, 35(6): 1032-1039.

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Novel Small Four-armed Molecules with Triphenylamine-bridged Structure for Organic Solar Cells Featuring High Open-circuit Voltage

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