聚酰亚胺
电介质
材料科学
热稳定性
无定形固体
介电常数
阈值电压
聚合物
高-κ电介质
光电子学
电容器
活化能
晶体管
电压
化学工程
电气工程
复合材料
化学
有机化学
工程类
图层(电子)
作者
Weiwen Zheng,Tengzhou Yang,Lunjun Qu,Xiaoci Liang,Chuan Liu,Chao Qian,Tianwen Zhu,Zhuxin Zhou,Siwei Liu,Zhenguo Chi,Jizheng Xu,Yi Zhang
标识
DOI:10.1016/j.cej.2022.135060
摘要
High–dielectric–constant (high–k) polymers are highly desirable for high energy density capacitors and low–voltage organic thin-film transistors (OTFTs). However, conventional high–k polymers suffer from low temperature resistance or crystalline state, hampering their applications in electronic devices in general environments. Herein, by accurate monomer design and mild polycondensation, we synthesize a new polyimide (STP–PI) featuring amorphous state, intrinsic high–k, very high thermal stability, and self-standing properties. Having polar side groups and rigid twisty backbones, the STP–PI exhibits both high and stable permittivity (5.2 ∼ 6.0 from 1 MHz to 100 Hz) and excellent thermal stability (Td5% > 450 °C and Tg > 300 °C), superior to its counterpart without the polar side group. When applied for energy storage, STP–PI delivers a discharged energy density of 3.68 J cm−3 with discharge efficiency of 84% at 350 MV m−1 even at 200 °C, which makes a record among the state–of–the–art performance of instinct polymer dielectrics. When applied in low-voltage OTFTs as the dielectric layers, the devices show a low threshold voltage of −0.30 V and mobility value of 4.03 cm2 V−1 s−1. The design strategy paves a way of making high–k polyimides for high temperature energy storage and electronic applications.
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