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Difluorobenzothiadiazole and Selenophene-Based Conjugated Polymer Demonstrating an Effective Hole Mobility Exceeding 5 cm(2) V-1 s(-1) with Solid-State Electrolyte Dielectric

Title
Difluorobenzothiadiazole and Selenophene-Based Conjugated Polymer Demonstrating an Effective Hole Mobility Exceeding 5 cm(2) V-1 s(-1) with Solid-State Electrolyte Dielectric
Authors
Nketia-Yawson, BenjaminJung, A-RaHieu Dinh NguyenLee, Kyung-KooKim, BongSooNoh, Yong-Young
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2018
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link
Citation
ACS APPLIED MATERIALS & INTERFACES vol. 10, no. 38, pp. 32492 - 32500
Keywords
organic thin-film transistorsdonor-acceptor conjugated polymerschain orientationcarrier mobilitysolid-state electrolyte
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We report synthesis of a new poly(4-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b']dithiophene-2-yl)-7-(4,4-bis(2-ethylhexyl)-6-(selenophene-2-yl)-4H-silolo [3,2-b:4,5-b']dithiophene-2-yl)-5,6-difluorobenzo[c] [1,2,5]thiadiazole (PDFDSe) polymer based on planar 4,7-bis(4,4-bis (2-ethylhexyl)-4H-silolo [3,2-b:4,5-b']dithiophen-2-yl)-5,6-difluorobenzo[c][1,2,5]thiadiazole (DFD) moieties and selenophene linkages. The planar backboned PDFDSe polymer exhibits highest occupied molecular orbital and lowest unoccupied molecular orbital levels of -5.13 and -3.56 eV, respectively, and generates well-packed highly crystalline states in films with exclusive edge-on orientations. PDFDSe thin film was incorporated as a channel material in top-gate bottom-contact organic thin-film transistor with a solid-state electrolyte gate insulator (SEGI) composed of poly(vinylidene difluoride-trifluoroethylene)/poly(vinylidene fluoride-co-hexafluroropropylene)/1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, which exhibited a remarkably high hole mobility up to mu = 20.3 cm(2) V-1 s(-1) corresponding to effective hole mobility exceeding 5 cm(2) V-1 s(-1) and a very low threshold voltage of -1 V. These device characteristics are associated with the high carrier density in the semiconducting channel region, induced by the high capacitance of the SEGI layer. The excellent carrier mobility from the PDFDSe/SEGI device demonstrates a great potential of semiconducting polymer thin-film transistors as electronic components in future electronic applications.
DOI
10.1021/acsami.8b14176
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사범대학 > 과학교육과 > Journal papers
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