| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 105 === Organic photovoltaics (OPVs) have the advantages of low manufacturing cost, environment friendly, material diversification and tenability. Therefore many studies have focused on the development of new organic materials in recent years to enhance the solar conversion efficiency and stability. In contrast to the polymers, small molecule organic compounds have consistent quality, well-defined structure and lower molecular weight, conducive to the evaporation process. Recently, a class of molecules with donor-acceptor-acceptor (D-A-A*) structure developed by our group can achieve a power conversion efficiency (PCE) of 6.80%. Based on this molecular architecture, we further introduced rigid and coplanar dithienopyrrole as electron donating part (D) to couple with benzothiadiazolecarbonitrile (A-A*), giving DTPFiCN and DTPFoCN. On the other hand, we introduced different numbers of fluorines and cyano groups into benzothiadiazole to enhance the ability of electron withdrawing, giving DTCPFFBTCN, DTCPiFBTCN, DTCPBTCN2 and DTCPBTCN3, to investigate the inductive effect and resonance effect of different substituted position. We also changed π-spacer to enhance the electron donating ability and quinoid character, giving DTCTBTCN3. Their photophysical and electrochemical properties, crystal packing, and photovoltaic performance of these seven molecules are disused.
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