萘二酰亚胺-苯并噻二唑共聚物的氟化对场效应晶体管中双极性行为的影响

Effect of fluorination of naphthalene diimide-benzothiadiazole copolymers on ambipolar behavior in field-effect transistors.

作者信息

An Cunbin, Makowska Hanna, Hu Benlin, Duan Ruomeng, Pisula Wojciech, Marszalek Tomasz, Baumgarten Martin

机构信息

Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany

Department of Molecular Physics, Faculty of Chemistry, Lodz University of Technology Zeromskiego 116 90-924 Lodz Poland

出版信息

RSC Adv. 2018 May 3;8(30):16464-16469. doi: 10.1039/c8ra02915f.

Two naphthalene diimide (NDI)-benzothiadiazole (BT) based conjugated polymers with high molecular weight, P1 and P2, were synthesized by introducing F atoms to modulate the electron-donating ability of the BT moiety. 3-Decyl-pentadecyl branched alkyl side chains were employed and expected to improve the molecular organization and device performance. Both polymers have excellent solubility in common organic solvents. UV-vis-NIR absorption and cyclic voltammetry indicate that the maximum absorption wavelength of P2 is blue-shifted and the HOMO energy level of P2 is decreased in comparison with P1. Two dimensional wide angle X-ray scattering of thin films revealed a similar organization of both polymers. A less balanced transport in field-effect transistors with increased electron mobility of 0.258 cm V s and lowered hole transport of 2.4 × 10 cm V s was found for P2. Polymer devices of P1 exhibited a balanced ambipolar transport, with a hole mobility of 0.073 cm V s and electron mobility of 0.086 cm V s.

通过引入氟原子来调节苯并噻二唑（BT）部分的给电子能力，合成了两种具有高分子量的基于萘二亚胺（NDI）-苯并噻二唑（BT）的共轭聚合物P1和P2。采用3-癸基-十五烷基支链烷基侧链，预期可改善分子排列和器件性能。两种聚合物在常见有机溶剂中均具有优异的溶解性。紫外-可见-近红外吸收光谱和循环伏安法表明，与P1相比，P2的最大吸收波长发生蓝移，且P2的最高占据分子轨道（HOMO）能级降低。薄膜的二维广角X射线散射显示两种聚合物具有相似的排列结构。对于P2，在场效应晶体管中发现其传输平衡性较差，电子迁移率增加至0.258 cm² V⁻¹ s⁻¹，空穴传输降低至2.4×10⁻⁴ cm² V⁻¹ s⁻¹。P1的聚合物器件表现出平衡的双极性传输，空穴迁移率为0.073 cm² V⁻¹ s⁻¹，电子迁移率为0.086 cm² V⁻¹ s⁻¹。