Phenazine-Substituted Poly(benzimidazobenzophenanthrolinedione): Electronic Structure, Thin Film Morphology, Electron Transport, and Mechanical Properties of an n-Type Semiconducting Ladder Polymer
Phenazine-Substituted Poly(benzimidazobenzophenanthrolinedione): Electronic Structure, Thin Film Morphology, Electron Transport, and Mechanical Properties of an n-Type Semiconducting Ladder Polymer
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DOI：
10.1021/acs.macromol.2c01999
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发表时间：
2023-02
期刊：
影响因子：
5.5
通讯作者：
Sarah M. West;Duyen K. Tran;Jiajie Guo;Shinya E. Chen;D. Ginger;S. Jenekhe
中科院分区：
文献类型：
--
作者：
Sarah M. West;Duyen K. Tran;Jiajie Guo;Shinya E. Chen;D. Ginger;S. Jenekhe
不像萘二亚胺、苝二亚胺和其他种类的n型共轭聚合物，它们有许多衍生物，可以理解结构-性能关系，阶梯聚苯并咪唑苯并菲罗啉（BBL）的任何衍生物的电子结构和性能尚未被报道。本文报道了BBL的非那嗪类衍生物BBL- p的合成及其性质。在酸性溶液中，由于质子增强的分子内电荷转移，BBL-P具有较宽的吸收光谱，最低能量吸收峰在840 nm处。与BBL相比，BBL- p薄膜的结晶度随着表面分子取向的降低而降低，导致场效应电子迁移率大幅降低，为1.2 × 10-4cm2 /V s。BBL- p薄膜具有优异的力学性能，杨氏模量为11 GPa。结果表明，BBL-P是一种很有前途的n型半导体聚合物，并为研究主链结构对共轭阶梯聚合物的电子结构、薄膜微观结构和电荷输运性质的影响提供了新的见解。
Unlike naphthalene diimides, perylene diimides, and other classes of n-type conjugated polymers with numerous derivatives that enable understanding of structure–property relationships, the electronic structure and properties have not been reported for any derivative of ladder poly(benzimidazobenzophenanthroline) (BBL). Herein, we report the synthesis and properties of BBL-P, a phenazine derivative of BBL. In acid solution, BBL-P has a broad absorption spectrum with a lowest energy absorption peak at 840 nm due to protonation-enhanced intramolecular charge transfer. Compared to BBL, BBL-P thin films have decreased crystallinity with face-on molecular orientations on substrates, resulting in a substantially decreased field-effect electron mobility of 1.2 × 10–4cm2/V s. BBL-P films have excellent mechanical properties exemplified by a Young modulus of 11 GPa. The results demonstrate that BBL-P is a promising n-type semiconducting polymer and provide new insights into the effects of backbone structure on electronic structure, thin film microstructure, and charge transport properties of conjugated ladder polymers.