

FOLLOWUS
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
Ling-hai Xie (解令海), E-mail: iamlhxie@njupt.edu.cn
Ming-dong Yi (仪明东), E-mail: iammdyi@njupt.edu.cn
Wei Huang (黄维), E-mail: iamwhuang@njupt.edu.cn
Received:21 March 2016,
Revised:2016-4-28,
Accepted:01 May 2016,
Published:05 October 2016
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Liu Bin, Bao Yan, Ling Hai-feng, et al. Fluorinated
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 10
4
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.
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