取代单噻吩染料敏化剂的合成与性能

Synthesis and Photovoltaic Properties of the Thiophene bearing-alkyl-substituents Sensitizers

摘要:

本文选择三苯胺为电子给体，氰基乙酸为电子受体，分别以烷基取代单噻吩（烷基链分别为H、CH3、C4H9、C6H13、C8H17）为π-共轭桥链，合成了D-x系列5种有机染料敏化剂。考察了烷基链的引入及其长短对染料敏化剂光物理、电化学和光伏等性能的影响。结果表明：引入烷基侧链的D-2~D-5，紫外-可见光谱（UV-vis）发生蓝移；随着烷基链的延长，光生电流密度（Jsc）减小，开路电压（Voc）和填充因子（FF）呈增大趋势；甲基取代的染料D-2获得最高光电转换效率5.64%。

Abstract:

Abstract: Five organic dyes of D-x series were synthesized which contained triphenylamine (TPA) moieties as electron donors and cyanoacrylic acid moieties as electron acceptors, alkyl thiophene (alkyl chain were H、CH3、C4H9、C6H13、C8H17 respectively )as π-conjugated linker. The effects of both the alkyl chains and the length of the alkyl chains on the photo-physical, electrochemical and photovoltaic properties of the dyes were studied. The results indicated that D-2~D-5 dyes with alkyl chains the UV-Vis absorption spectra were occurred blue shift; With prolonging alkyl chains, the short-circuit photocurrent density (Jsc) decreased gradually, while open-circuit photovoltage(Voc) and fill factor (FF) were improved. The results of photovoltaic performance indicated that PCE of D-2 with methyl substituent (5.64%) is slightly higher than that of other dyes.