상세정보
학술지
Solution-Processable Field-Effect Transistor Using a Fluorene- and Selenophene-Based Copolymer as an Active Layer
- 저자
- 김영미, 임은희, 강인남, 정병준, 이재민, 구본원, 도이미, 심홍구
- 발행일
- 200606
- 출처
- Macromolecules, v.39 no.12, pp.4081-4085
- ISSN
- 0024-9297
- 출판사
- American Chemical Society(ACS)
- 협약과제
- 06IB1100, OTFT 소자 신뢰성 향상 기술 개발, 도이미
- 초록
- We have synthesized a new p-type polymer, poly(9,9??-n- dioctylfluorene-alt-biselenophene) (F8Se2), via the palladium-catalyzed Suzuki coupling reaction. The number-average molecular weight (Mn) of F8Se2 was found to be 72 600. F8Se2 dissolves in common organic solvents such as chloroform and chlorobenzene. The PL emission peak of a film of F8Se2 is clearly red-shifted with respect to that of its sulfur analogue, poly(9,9??-n- dioctylfluorene-alt-bithiophene) (F8T2), due to the electron-donating properties of selenium and the strong interactions between the biselenophene moieties in neighboring copolymer chains. We confirmed that F8Se2 is a thermotropic liquid crystalline polymer with an aligned structure by carrying out DSC, PLM, and XRD measurements. The introduction of the selenophene moiety into the liquid-crystalline polymer system results in better field-effect transistor (FET) performance than that of F8T2. A solution-processed F8Se2 FET device with a bottom contact geometry was found to exhibit a hole mobility of 0.012 cm 2/(V s) and a low threshold voltage of -4 V, which is the one of the highest solution-processable FET performances. © 2006 American Chemical Society.
- KSP 제안 키워드
- Active Layer, Aligned structure, Bottom contact, Contact geometry, Emission peak, FET devices, Field-effect transistors(FETs), Hole mobility, Liquid-crystalline polymer(LCP), Number-average molecular weight, PL emission