为了减少带隙,提高电荷迁移率并增强材料的光伏性能,研究了梯形茚满二噻吩基聚合物(PIDT-DFBT)上的硒取代。新的茚三烯二烯基聚合物(PIDSe-DFBT)与硫类似物相比,在薄膜中具有更好的吸收性,并且电荷迁移率(分别为0.15和0.064 cm 2 /(V s))和电子迁移率分别为0.002和0.002,大大提高了。0.008厘米2/(V s)for PIDT-DFBT)。增强的材料特性导致光伏电池的功率转换效率提高了6.8%,比基于PIDT-DFBT的设备提高了13%。此外,我们检查了分子量对PIDSe-DFBT性质的影响,发现分子量不仅对迁移率有很强的依赖性,而且对聚合物膜的吸收率也有很强的依赖性,每增加15000 g / mol重量,就会导致材料的吸收率提高了25%。材料性能的分子量依赖性导致光伏性能的显着差异,高分子量PIDSe-DFBT由于其改善的吸收和空穴迁移率而提供了更高的光电流,填充因子和效率。
Synthesis and properties of fully conjugated indacenediselenophene and diindenoselenophene derivatives
作者:Jonathan L. Marshall、Gabriel E. Rudebusch、Chris L. Vonnegut、Lev N. Zakharov、Michael M. Haley
DOI:10.1016/j.tetlet.2014.12.096
日期:2015.6
The synthesis and characterization of indacenediselenophene (IDS) and diindenoselenophene (DIS), the selenophene-containing analogues of indacenedithiophene (IDT) and diindenothiophene (DIT), respectively, are described. Cyclic voltammetry reveals that IDS and DIS both undergo two one-electron reductions and a one-electron oxidation and have narrower HOMO/LUMO energy gaps when compared to their thiophene-containing counterparts. The UV-Vis spectrum of IDS exhibits a red-shifted absorbance maximum with respect to the sulfur-containing IDT, and single crystal XRD shows close C-Se contacts of 3.407 angstrom (IDS) and close C-C contacts of 3.358 angstrom (DIS). (C) 2014 Elsevier Ltd. All rights reserved.
New selenophene-based low-band gap conjugated polymers for organic photovoltaics
Low-band gap selenophene-based polymers were synthesized. Their optoelectronic and photovoltaic properties and space-charge limited currents were compared with those of the related thiophene-based polymers. The band gaps of the Se-based derivatives were approximately 0.05-0.12 eV lower than those of their thiophene counterparts. Organic photovoltaic (OPV) devices based on the blends of these polymers and 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-C-71 (PC71BM) were fabricated, and the maximum power conversion efficiency of the OPV device based on PSPSBT and PC71BM was 3.1%with a short-circuit current density (J(sc)) of 9.3 mA cm(-2), an open-circuit voltage (V-oc) of 0.79 V, and a fill factor of 0.42under AM 1.5 G illumination (100 mW cm(-2)). (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4550-4557