Role of Polymer Structure on the Conductivity of N-Doped Polymers
Role of Polymer Structure on the Conductivity of N-Doped Polymers
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DOI：
10.1002/aelm.201600004
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发表时间：
2016-05-01
影响因子：
6.2
通讯作者：
Bao, Zhenan
中科院分区：
文献类型：
--
作者：
Naab, Benjamin D.;Gu, Xiaodan;Bao, Zhenan
报道了基于二萘嵌苯二酰亚胺（PDI）和萘二酰亚胺（NDI）受体与乙炔、乙烯和联噻吩通过二聚掺杂剂（2-Cyc-DMBI）（2）共聚的几种共轭共聚物的n掺杂。在溶液中的n-掺杂反应，通过紫外-可见-近红外光谱和光热偏转光谱（PDS）在薄膜中证实。通过吸收光谱的比较，发现乙炔连接的聚合物的还原物种沿聚合物主链比双噻吩连接的聚合物更离域沿着。测得乙炔连接的聚合物P（PDI 2 OD-A）的高电导率为0.45 S cm（-1）。相比之下，两种联噻吩连接的聚合物P（NDI 2 OD-T2）和P（PDI 2 OD-T2）都没有实现大于4 × 10（-3）S cm（-1）的电导率。此外，掺杂膜的电导率和本研究中使用的纯膜的迁移率之间没有相关性。掠入射X-射线衍射（GIXD）测量的薄膜发现，一个类似的掺杂相的形式，无论纯的主聚合物的结晶度。在没有显着差异的形态，这些结果表明极化子离域长度的聚合物和导电性之间的联系，更根本的聚合物的主链结构和极化子离域长度之间。
The n-doping of several conjugated co-polymers based on perylene diimide (PDI) and napthalene diimide (NDI) acceptors co-polymerized with ethynylene, ethylene, and bithiophene by the dimeric dopant (2-Cyc-DMBI)(2) is reported. The n-doping reactions are confirmed in solution by UV-Vis-NIR spectroscopy and in thin films with photothermal deflection spectroscopy (PDS). The reduced species of the ethynylene-linked polymers are found to be more delocalized along the polymer backbone than the bithiophene-linked polymers by comparison of the absorption spectra. A high conductivity of 0.45 S cm(-1) is measured for the ethynylene-linked polymer P(PDI2OD-A). In contrast, neither of the two bithiophene-linked polymers, P(NDI2OD-T2) and P(PDI2OD-T2), achieve conductivities greater than 4 x 10(-3) S cm(-1). Furthermore, there is no correlation between the conductivity of the doped films and the mobility of the pure films used in this study. Grazing incidence X-ray diffraction (GIXD) measurements of the films find that a similar doped phase forms irrespective of the crystallinity of the pure host polymer. In absence of a significant difference in morphology, these results suggest a link between the polaron delocalization length of the polymers and the conductivity, and more fundamentally between the backbone structure of the polymer and the polaron delocalization length.