当前位置: X-MOL 学术Dyes Pigments › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Tuning electrical memory properties by varying terminal moieties of functional hyperbranched polyimides
Dyes and Pigments ( IF 4.5 ) Pub Date : 2018-01-02 , DOI: 10.1016/j.dyepig.2017.12.063
Haiwei Tan , Huaxuan Yu , Hongyan Yao , Ying Song , Shiyang Zhu , Ningning Song , Kaixiang Shi , Bo Zhang , Shaowei Guan

In this paper, three functional hyperbranched polyimides (HBPIs) terminated with N-(4-aminophenyl) carbazole (APC), 4-aminotriphenylamine (ATPA) and N-(4-aminophenyl) phenoxazine (APP) were synthesized and denoted as 6FDA-HBPI-APC, 6FDA-HBPI-ATPA and 6FDA-HBPI-APP. In these polymers, 4, 4’-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) served as electron-acceptor and the terminal moieties served as electron-donor to promote charge-transfer (CT). The difference among the three terminal moieties was the different links between the two benzene rings in the triphenylamine moiety for the APC (C-C single bond), ATPA (ether bond) and APP (without chemical bond), respectively. This structure variation can lead to different electron-donating abilities of the terminal moieties. Memory devices using HBPI films as building blocks with sandwich structure of indium tin oxide (ITO)/HBPI/Al were fabricated to evaluate the performance of the polymers. Current-voltages (I-V) characterization results suggested that all the devices exhibited volatile static random access memory (SRAM) behavior as well as excellent stability under constant voltage during operation time. The orbital levels obtained from the UV-vis and cyclic voltammetry (CV) measurements show the same change trend as that calculated by molecular simulation. The gradually increased HOMOs indicated the enhanced electron-donating ability of APC, ATPA and APP, resulting the decreased threshold voltages.



中文翻译:

通过改变功能性超支化聚酰亚胺的末端部分来调节电存储性能

在本文中,三个功能的超支化聚酰亚胺(HBPIs)终止ñ - (4-氨基苯基)咔唑(APC),4- aminotriphenylamine(ATPA)和Ñ合成了-(4-氨基苯基)吩恶嗪(APP),分别表示为6FDA-HBPI-APC,6FDA-HBPI-ATPA和6FDA-HBPI-APP。在这些聚合物中,以4,4′-(六氟异亚丙基)二邻苯二甲酸酐(6FDA)为电子受体,末端部分为电子供体,以促进电荷转移(CT)。三个末端部分之间的差异是分别在APC(CC单键),ATPA(醚键)和APP(无化学键)的三苯胺部分中的两个苯环之间的连接不同。这种结构变化可导致末端部分的电子给体能力不同。制造了使用HBPI膜作为构建模块的存储设备,该存储设备具有氧化铟锡(ITO)/ HBPI / Al的三明治结构,以评估聚合物的性能。电流电压(IV)表征结果表明,所有器件在工作时间内均表现出易失性静态随机存取存储器(SRAM)的性能以及在恒定电压下的出色稳定性。从紫外可见和循环伏安法(CV)测量获得的轨道能级显示出与分子模拟计算得出的相同的变化趋势。HOMOs逐渐增加表明APC,ATPA和APP的供电子能力增强,从而导致阈值电压降低。

更新日期:2018-01-02
down
wechat
bug