摘要
将苯甲醛基团引入到硫杂萘二酰亚胺共轭骨架中,与不同共轭程度和刚性的芳香二胺进行缩合反应,构筑了一类基于硫杂萘二酰亚胺的席夫碱型聚合物P1、P2、P3。采用紫外-可见吸收光谱(UV-Vis)、循环伏安等研究了材料的基本物理化学性质。这类聚合物具有良好的成膜性和较低的最低未占分子轨道能级(-4.07^-4.19 eV)。聚合物P3含有刚性萘单元,其UVVis的最大吸收波长(λmax)为754 nm,比P1和P2分别红移了约76 nm和75 nm。X射线衍射(XRD)表明,聚合物P1、P2、P3的薄膜均呈现无定形的特征。以溶液甩膜法制备了此类聚合物的有机场效应晶体管(OFET)器件,其中聚合物P3的薄膜经300℃热退火,其OFET器件的电子迁移率可达2.47×10^-3 cm^2/(V·s),开关比为105,表明聚合物P3是一种可耐高温处理的n-型半导体材料。在聚合物共轭骨架中引入刚性的结构单元,可以有效调控吸收光谱、能级结构和薄膜形貌,进而提升OFET器件性能。
A library ofπ-conjugated systems have been developed through conventional tools of coupling(e.g.Suzuki coupling,Stille coupling)and have been used for the fabrication of organic optoelectronic devices.Herein,a facile,atomefficient and environmentally benign pathway is outlined,with water as the only by-product,for the synthesis of conjugated Schiff-based copolymers based on sulfur-heterocycle fused naphthalene diimides(NDIs)and aromatic diamines.These copolymers showed broad absorption spectra in the ultraviolet-visible(UV-Vis)region and low-lying LUMO levels at about-4.07--4.19 eV.The relationship between the chemical structure and the performance,including the optical properties,electrochemical properties,thermal stability,morphologies and the field-effect performance in transistors,is fully studied using these polymers as active layer.Compared with P1 and P2,P3 exhibits an absorption peak at 754 nm,with red shifts of 76 nm and 75 nm,respectively.An electron mobility of up to 2.47×10^-3 cm^2/(V·s)can be achieved for P3-based transistors after performing a thermal annealing process at 300℃.The incorporation of rigid structure units into polymer conjugated skeleton can effectively tune its spectral absorption,energy level structure as well as the film morphology,thus improving the device performance.
作者
李建高
李晶
高希珂
LI Jiangao;LI Jing;GAO Xike(Shanghai Institute of Organic Chemistry,Chinese Academy of Sciences,University of Chinese Academy of Sciences,Shanghai 200032,China)
出处
《功能高分子学报》
CAS
CSCD
北大核心
2020年第2期148-156,共9页
Journal of Functional Polymers
基金
中国科学院青年创新促进会(2011192)
国家自然科学基金(21674126)。
