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제119회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Quinoidal Molecules as a New Class of Ambipolar Semiconductor Originating from Amphoteric Redox Behavior

2017년 3월 21일 09시 59분 28초
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목 10시 : 47분
한국다우케미칼 우수논문상 수상자 구두발표
저자 및
황한수, 김동윤1, 윤진문2, 장수영, 노용영1,*, 김동유3,*
GIST 신소재공학과, Korea
1동국대학교 융합에너지신소재공학과, Korea
2한국원자력연구원 , Korea
3GIST 신소재공학과,나노바이오재료전자공학과, Korea
Recently, intensive research of organic electronics based on organic semiconductors has achieved high performance exceeding that of inorganic amorphous silicon. This remarkable progress is attributed to the design and the synthesis of various conjugated molecular building blocks. Conjugated molecules which exhibit high planarity and close stacking are favorable for increasing charge transport property. Among numerous planar molecular building blocks, conjugated molecules based on quinoid structure were focused on in this research. Quinoid structure refers to the aromatic structure linked with double bonds between aromatic rings. In order to retain quinoidal form, specific end group is required. Here, isatin molecule was used as end group for obtaining quinoidal bichalogenophenes. Quinoidal bithiophene (QBT) and quinoidal biselenophene (QBS) were synthesized by short 2 steps. Two small molecules, QBT and QBS, showed low band gap of approximately 1.5 eV in spite of short quinoidal core. Measurement of cyclic voltammetry of QBT and QBS displayed both oxidation and reduction potential; and corresponding highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) level were calculated as 3.7 and 5.3 eV. The organic field-effect transistors based on both quinoidal small molecules showed typical ambipolar behavior arisen from low band gap and amphoteric redox property of quinoidal molecules.