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Synthesis of Cyclopentadithiophene-Diketopyrrolopyrrole Donor-Acceptor Copolymers for High-Performance Nonvolatile Floating Gate Memory Transistors with Long Retention Time
- Synthesis of Cyclopentadithiophene-Diketopyrrolopyrrole Donor-Acceptor Copolymers for High-Performance Nonvolatile Floating Gate Memory Transistors with Long Retention Time
- Jeon, Soyeon; Sun, Cheng; Yu, Seong Hoon; Kwon, Soon-Ki; Chung, Dae Sung; Jeong, Yong Jin; Kim, Yun-Hi
- DGIST Authors
- Chung, Dae Sung
- Issue Date
- ACS Applied Materials and Interfaces, 12(2), 2743-2752
- Article Type
- Author Keywords
- organic field-effect transistors; donor-acceptor copolymers; floating-gate; flash memory; high-performance; bias stability
- FIELD-EFFECT TRANSISTORS; POLYMER SEMICONDUCTORS; ORGANIC SEMICONDUCTORS; CHARGE-TRANSPORT; BUILDING-BLOCKS; MOBILITY; STABILITY; DISORDER; DENSITY
- 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.
- American Chemical Society
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- Department of Energy Science and EngineeringPolymer Energy Materials Lab1. Journal Articles
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