期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 44, 页码 5484-5493出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201300372
关键词
organic memory; ferroelectric polymers; multilevel memory; field effect transistor memory
类别
资金
- Converging Research Center Program through the Ministry of Education, Science, and Technology [2011K000631]
- Brain Korea 21 Project
- Korea Science and Engineering Foundation (KOSEF)
- Ministry of Science and Technology (MEST), Republic of Korea [R11-2007-050-03001-0]
- National Research Foundation of Korea [2007-0056091, 2010-50193, 2009-0080235] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Polymer ferroelectric-gate field effect transistors (Fe-FETs) employing ferroelectric polymer thin films as gate insulators are highly attractive as a next-generation non-volatile memory. Furthermore, polymer Fe-FETs have been recently of interest owing to their capability of storing data in more than 2 states in a single device, that is, they have multi-level cell (MLC) operation potential for high density data storage. However, among a variety of technological issues of MLC polymer Fe-FETs, the requirement of high voltage for cell operation is one of the most urgent problems. Here, a low voltage operating MLC polymer Fe-FET memory with a high dielectric constant (k) ferroelectric polymer insulator is presented. Effective enhancement of capacitance of the ferroelectric gate insulator layer is achieved by a simple binary solution-blend of a ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) (k approximate to 8) with a relaxer high-k poly(vinylidene-fluoride-trifluoroethylene-chlorotrifluoroethylene) (PVDF-TrFE-CTFE) (k approximate to 18). At optimized conditions, a ferroelectric insulator with a PVDF-TrFE/PVDF-TrFE-CTFE (10/5) blend composition enables the discrete six-level multi-state operation of a MLC Fe-FET at a gate voltage sweep of +/- 18 V with excellent data retention and endurance of each state of more than 10(4) s and 120 cycles, respectively.
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