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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:大连理工大学学报

Volume:58

Issue:1

Page Number:1-8

ISSN No.:1000-8608

Abstract:Two novel small molecule photovoltaic donor materials of BT-2 and BT-1 are designed and synthesized by Suzuki coupling reaction,consisting of 5,6-bis-(octyloxy)benzo [c][1,2,5] thiadiazole as acceptor core,9-phenyl-9 H-carbazole or N,N-dimethylaniline donor unit as different ending groups,and bithiophene or thiophene as π bridge-bond,respectively.The structures of two small molecules are characterized by NMR and HRMS,and the properties of the materials are studied by UV-visible absorption spectra,cyclic voltammetry and DFT as well as TD-DFT computation.The results show that the compounds BT-1 and BT-2 all have good solubility in common organic solvent, and exhibit a broad absorption range covering the whole visible spectral region and keep the appropriate HOMO and LUMO energy levels matched with acceptor material PC61BM.BT-1 with 9-phenyl-9 H-carbazole as donor unit shows more deeper HOMO energy level which is beneficial for increasing the open-circuit voltage.BT-2 with N,N-dimethylaniline donor unit achieves relatively narrow bandgap which is beneficial for getting higher short circuit current.

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