Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 55, Issue 21, Pages 3554-3564Publisher
WILEY
DOI: 10.1002/pola.28737
Keywords
charge storage; memory; modification; polymer electret; structure-property relations
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Funding
- National Natural Science Foundation of China [21274064, 21322402, 61475074, 21504047, 61136003, 21404057]
- Natural Science Foundation of Jiangsu Province of China [BM2012010, BK20150834, BK20140948]
- Natural Science Fund for Colleges and Universities in Jiangsu Province [14KJB430016]
- Synergetic Innovation Centre for Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications Scientific Foundation [NY214179]
- Excellent Science and Technology Innovation Team of Jiangsu Higher Education Institutions
- Six Peak Talents Foundation of Jiangsu Province [XCL-CXTD-009]
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Three poly(N-vinylcarbazole) (PVK)-based polymer electrets were synthesized through Friedel-Crafts postfunctionalization for the function of charge storage in nonvolatile organic field effect transistor (OFET) memory devices. The bulky side chain effect of these stacked polymer electrets on the morphology, water contact angles, and memory characteristics were examined with regard to those of precursor PVK. The introduction of steric hindrance groups could interrupt the large length of pi-stacked structures in PVK and block the form of region-regular structures from region-random on external electric field. As a result, the memories based on the three modified polymers exhibited approximate memory windows of 32 V increased by 13 V with respect to PVK. Besides, the write-read- erase-read cycles stability of the modified polymers was superior to that of PVK. Furthermore, we found that the holes were mainly located in the region of local pi-stacked structures and bulky pi-conjugated groups also acted as additional electron trapping sites. Molecular engineering of charge trapping site with tunneling polymers will be a promise strategy for the advance of transistor memory. (C) 2017 Wiley Periodicals, Inc.
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