The effect of cyclic thiourea functionalization and β,β′-dialkylbithiophene linker on the performance of triphenylamine dyes
摘要:
Four new dyes (T-C1, T-C6, S-C1 and S-C6) with beta,beta '-dialkylbithiophene as pi-linkers were synthesized and utilized in dye-sensitized solar cells (DSSCs). Compared with the reference dyes (T-C0 and AZ6) with bithiophene as pi-linkers, these dyes show blue-shifted absorption bands, and their DSSCs produce lower short-circuit current and high open-circuit voltage. These may be caused by the increase of dihedral angle between two thiophenes. On the one hand, the molecular conjugations are decreased: on the other hand, steric effect of the whole structures are increased. Compared with the triphenylamine dyes (T-C0, T-C1 and T-C6), the cyclic thiourea functionalized dyes (AZ6, S-C1 and S-C6) exhibit better photophysical and photovoltaic performances. However, the superiority of cyclic thiourea functionalization is gradually disappearing with the increased steric effect of the pi-linkers. (C) 2015 Elsevier B.V. All rights reserved.
合成了不对称取代的双和四噻吩衍生物。在外噻吩环之一上带有吸电子取代基 X 的不对称取代的联噻吩在比对称双取代的联噻吩衍生物更长的波长处表现出吸收带的最大值,而不对称的四联噻吩在比相应的对称性更短的波长处具有这样的最大值那些。在带有推拉取代基的双或四噻吩的情况下,由于吸电子取代基 X 导致的最长波长吸收带的红移趋势更为明显。不对称四噻吩表现出比相应的联噻吩更大的三阶非线性光学(TNLO)特性,类似于对称双噻吩和四噻吩之间的情况。然而,不对称双噻吩和四噻吩的 TNLO 特性显示不依赖于吸电子强度......
A cerium(III) triple decker porphyrin complex bearing bithienyl substituents (1) at the peripheral meso-positions was synthesized. Electrochemical polymerization of the triple decker porphyrin gave a unique polymer film on the ITO electrode surface without decomposition.