P3HT的系统氟化:在OPV中通过直接丙烯酸化,表征和装置性能合成P(3HT- co -3H4FT)s
摘要:
我们提出了一种通过掺入氟化噻吩重复单元来调节基于P3HT的共聚物的物理性能的策略。描述了一系列氟化聚噻吩P(3HT- co -3H4FT)材料的合成和表征,其中聚合物主链中的氟化重复单元的百分比从0%到100%系统地变化。这些P(3HT- co -3H4FT)s(P0,P25,P50,P75和P100通过直接芳基化聚合(DArP)方法合成)。通过改变两种单体的进料比,可以精确控制氟化重复单元(3H4FT)的百分比。随着氟化作用的增加,对聚合物的电子性能产生强烈影响,与P0相比,P100的E HOMO能级降低了0.4 eV 。GIWAXS和TEM用于确定结晶度和形态。薄膜聚合物/ PCBM本体-异质结共混物的TEM分析表明,增加的氟化作用不会导致更强的相分离。制造有机光伏器件以评估由于氟化作用导致的器件性能变化。
3-Fluoro-4-hexylthiophene as a Building Block for Tuning the Electronic Properties of Conjugated Polythiophenes
作者:Frédéric Gohier、Pierre Frère、Jean Roncali
DOI:10.1021/jo302571u
日期:2013.2.15
3-Fluoro-4-hexylthiophene has been prepared by a synthetic route involving perbromination of 3-hexylthiophene followed by protection of the 2- and 5-positions of thiophene by trimethylsilyl groups and bromine/fluorine exchange. As expected, 3-hexyl-4-fluorothiophene oxidizes at a higher potential than 3-hexylthiophene; however, all attempts to electropolymerize this new thiophenic monomer have remained unsuccessful. Three terthienyls containing 3-hexylthiophene, 3-fluoro-4-hexylthiophene, and 3-bromo-4-hexylthiophene as the median group have been synthesized and used as substrates for electropolymerization. The electronic properties of the starting terthienyls and the resulting polymers have been analyzed by cyclic voltammetry and UV-vis spectroscopy, and the effects of substitution of the median thiophene ring are discussed.
Influence of Backbone Fluorination in Regioregular Poly(3-alkyl-4-fluoro)thiophenes
作者:Zhuping Fei、Pierre Boufflet、Sebastian Wood、Jessica Wade、John Moriarty、Eliot Gann、Erin L. Ratcliff、Christopher R. McNeill、Henning Sirringhaus、Ji-Seon Kim、Martin Heeney
DOI:10.1021/jacs.5b02785
日期:2015.6.3
We report two strategies toward the synthesis of 3-alkyl-4-fluorothiophenes containing straight (hexyl and octyl) and branched (2-ethylitexyl) alkyl groups. We demonstrate that treatment of the dibrominated monomer with 1 equiv of alkyl Grignard reagent leads to the formation, of a single regioisomer as:a result of the pronounced directing effect of the fluor-hie group. Polymerization of the resulting species affords highly regioregular poly(3-alkyl-4-fluoro)-thiophenes. Comparison Of their properties to those of the analogous non-fluorinated polymers shows that backbone fluorination leads to an increase in the polymer ionization potential without a significant change in optical band gap. Fluorination also results in an enhanced tendency to aggregate in solution, which is ascribed to a more co-planar backbone on the basis of Raman and DFT calculations. Average charge carrier mobilities in field-effect transistors are found to increase by up to a factor of 5 for the fluorinated polymers.