Citation: Liu Bin, Bao Yan, Ling Hai-feng, Zhu Wen-sai, Gong Rui-jun, Lin Jin-yi, Xie Ling-hai, Yi Ming-dong, Huang Wei. Fluorinated p-n Type Copolyfluorene as Polymer Electret for Stable Nonvolatile Organic Transistor Memory Device[J]. Chinese Journal of Polymer Science, ;2016, 34(10): 1183-1195. doi: 10.1007/s10118-016-1826-0 shu

Fluorinated p-n Type Copolyfluorene as Polymer Electret for Stable Nonvolatile Organic Transistor Memory Device

Liu Bin ^a ,
Bao Yan ^a ,
Ling Hai-feng ^a ,
Zhu Wen-sai ^b ,
Gong Rui-jun ^a ,
Lin Jin-yi ^b ,
Xie Ling-hai ^a,, ,
Yi Ming-dong ^a,, ,
Huang Wei ^a,b,,

^a Centre for Molecular Systems and Organic Devices, Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing 210023, China
^b Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China

Corresponding author: Xie Ling-hai, iamlhxie@njupt.edu.cn Yi Ming-dong, iammdyi@njupt.edu.cn Huang Wei, iamwhuang@njupt.edu.cn
Received Date: 21 March 2016
Revised Date: 28 April 2016
Accepted Date: 1 May 2016

Fund Project: University of Jiangsu Province Natural Science Foundation Project 14KJB510027Natural Science Foundation of Jiangsu Province BM2012010the National Natural Science Funds for Excellent Young Scholar 21322402the National Natural Science Foundation of China 21274064, 61475074, 21504041 and 61136003Jiangsu Planned Projects for Postdoctoral Research Funds 1501019BSynergetic Innovation Center for Organic Electronics and Information Displays, Natural Science of the Education Committee of Jiangsu Province 15KJB430019

In this study, a kind of fluorinated copolyfluorene, named poly[(4-(octyloxy)-9,9-diphenylfluorene-2,7-diyl)-alt-(2,3,5,6-tetrafluoro-1,4-phenylene)] (PODPF-TFP), is synthesized by facile palladium-based direct aromatization. Compared to the non-fluorinated counterpart, poly[(4-(octyloxy)-9,9-diphenylfluorene-2,7-diyl)-alt-(p-phenylene)] (PODPF-P), deeper HOMO/LUMO energy level combined with steric hindrance effect endow PODPF-TFP with excellent spectra and morphology stability. Finally, organic field-effect transistor (OFET) memory devices are fabricated with PODPF-P/PODPF-TFP as the dielectric layers, and they both exhibit flash type storage characteristic. Owing to the electronegativity of fluorine atom, the device based on PODPF-TFP exhibits larger memory window and more stable I_on/I_off ratio during a retention time of 10⁴ s as well as a better aging stability. The present study suggests that fluorinated p-n copolyfluorene electrets could enhance the capabilities of charge trapping and storage, which are promising for OFET memory devices.
- p-n copolyfluorenes,
- Fluorine atom,
- Direct aromatization,
- Polymer dielectric,
- Transistor memory
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