A novel D-π-A-π-D type small-molecule photovoltaic (PV)material FLEBT is designed and synthesized successfully, which uses alkyl-substituted fluorene as donor (D ) unit, benzothiadiazole as acceptor (A)unit and triple bond asπ-linkage.The structure is characterized with NMR and HRMS.The optical and electrochemical properties of FLEBT are investigated by UV-Vis absorption spectroscopy and cyclic voltammetry experiments.These experimental results exhibit that FLEBT has excellent solubility and film-forming properties in organic solvents, strongly intramolecular charge transfer (ICT)feature,a broad absorption range in UV-Vis absorption spectra and appropriate energy levels relatively to acceptor material PC61 BM.The PV properties of solution-processed bulk heteroj unction (BHJ ) solar cells are investigated by using FLEBT as donor and PC61 BM as acceptor.As a preliminary result,it reveals a performance with a Voc of 0.72 V,a Jsc of 0.93 mA·cm-2 ,and a power conversion efficiency (PCE)of 0.18% under an illumination of AM 1.5 G (100 mW·cm-2 ).As a result,this kind of small-molecule is a potential organic small-molecule PV material.%成功设计并合成了以三键为桥键,苯并噻二唑为受体(A)单元,二己基芴为给体(D)单元的D-π-A-π-D型小分子光伏材料 FLEBT,利用核磁、高分辨质谱对该化合物进行了结构表征.FLEBT的光学性能和电化学性能分别通过紫外-可见光谱及循环伏安法进行测定.结果显示,FLEBT在有机溶剂中具有较好的溶解性和成膜性,具有较强的分子内电荷迁移(ICT)特征、较宽的紫外-可见吸收范围,并具有与受体材料PC61 BM相匹配的电子能级.因此利用 FLEBT为给体材料,PC61 BM为受体材料,通过溶液过程加工法制作了体异质结(BHJ)太阳能电池,初步探索了材料的光伏性能.在模拟太阳光 AM 1.5 G (100 mW·cm-2)下,器件开路电压(Voc)为0.72 V,短路电流(Jsc)为0.93 mA·cm-2,光电转换效率(PCE)为0.18%.研究结果表明,这类小分子是一种潜在的有机小分子光伏材料.
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