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Date of Publication:2014-01-01

Journal:Journal of Dalian University of Technology

Volume:54

Issue:2

Page Number:163-170

ISSN No.:1000-8608

Key Words:"organic synthesis; benzothiadiazole; solution-processable; bulk-heteroj unction (BHJ); photovoltaic materials"

CN No.:21-1117/N

Abstract:Two novel benzothiadiazole-based small molecules with the electron-withdrawing fluorine atom and cyanogroup as ending-group, namely 2F-TT-BT and 2CN-TT-BT, were synthesized successfully by Suzuki coupling and Knoevengel condensation reaction,respectively.Their molecular structures were characterized by NMR and HRMS,and their properties were investigated by density functional theory (DFT) calculations, UV-vis absorption spectroscopy and cyclic voltammetry experiments.The photophysical and electrochemical properties show that the synthesized compounds exhibit broad absorption range covering the whole UV-vis spectral region of the sunlight and keep appropriate HOMO and LUMO energy levels with PC_(61) BM to satisfy the basic requirements of solution-processable preparation for OSCs.Therefore,the photovoltaic (PV)property of 2F-TT-BT as donor was investigated by fabricating the bulk-heterojunction (BHJ)solar cells with a typical structure of ITO/PEDOT:PSS/2F-TT-BT:PC_(61) BM (mass ratio:1∶2)/Al.As a preliminary result, it reveals a performance with a PCE of 0.53%.The experimental results indicate that these small molecules are potential PV materials for OSCs.

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