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Synthesis of Cyclopentadithiophene-Diketopyrrolopyrrole Donor-Acceptor Copolymers for High-Performance Nonvolatile Floating Gate Memory Transistors with Long Retention Time

Title
Synthesis of Cyclopentadithiophene-Diketopyrrolopyrrole Donor-Acceptor Copolymers for High-Performance Nonvolatile Floating Gate Memory Transistors with Long Retention Time
Authors
Jeon, SoyeonSun, ChengYu, Seong HoonKwon, Soon-KiChung, Dae SungJeong, Yong JinKim, Yun-Hi
DGIST Authors
Chung, Dae Sung
Issue Date
2020-01
Citation
ACS Applied Materials and Interfaces, 12(2), 2743-2752
Type
Article
Article Type
Article
Author Keywords
organic field-effect transistorsdonor-acceptor copolymersfloating-gateflash memoryhigh-performancebias stability
Keywords
FIELD-EFFECT TRANSISTORSPOLYMER SEMICONDUCTORSORGANIC SEMICONDUCTORSCHARGE-TRANSPORTBUILDING-BLOCKSMOBILITYSTABILITYDISORDERDENSITY
ISSN
1944-8244
Abstract
Organic flash memories that employ solution-processed polymer semiconductors preferentially require internal stability of their active channel layers. In this paper, a series of new donor-acceptor copolymers based on cyclopentadithiophene (CDT) and diketopyrrolopyrrole (DPP) are synthesized to obtain high performance and operational stability of nonvolatile floating-gate memory transistors with various additional donor units including thiophene, thiophene-vinylene-thiophene (CDT-DPP-TVT), selenophene, and selenophene-vinylene-selenophene. Detailed analyses on the photophysical, two-dimensional grazing incident X-ray diffraction, and bias stress stability are discussed, which reveal that the CDT-DPP-TVT exhibits excellent bias stress stability over 105 s. To utilize the robust nature of CDT-DPP-TVT, floating-gate transistors are fabricated by embedding Au nanoparticles between Cytop layers as a charge storage site. The resulting memory devices reveal bistable current states with high on/off current ratio larger than 104 and each state can be distinguished for more than 1 year, indicating a long retention time. Moreover, repetitive writing-reading-erasing-reading test clearly supports the reproducible memory operation with reversible and reliable electrical responses. All these results suggest that the internal stability of CDT-DPP-TVT makes this copolymer a promising material for application in reliable organic flash memory. Copyright © 2019 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/11539
DOI
10.1021/acsami.9b20307
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringPolymer Energy Materials Lab1. Journal Articles


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