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논문 기본 정보

자료유형
학술저널
저자정보
김병근 (청주대학교) 이상렬 (청주대학교)
저널정보
한국전기전자재료학회 Transactions on Electrical and Electronic Materials Transactions on Electrical and Electronic Materials 제18권 제1호
발행연도
2017.2
수록면
55 - 57 (3page)
DOI
https://doi.org/10.4313/TEEM.2017.18.1.55

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Amorphous oxide thin film transistors (TFTs) were fabricated with 0.5 wt% silicon doped zinc tin oxide (a-0.5SZTO) thinfilm deposited by radio frequency (RF) magnetron sputtering. In order to investigate the effect of annealing treatmenton the electrical properties of TFTs, a-0.5SZTO thin films were annealed at three different temperatures (300oC,500oC℃, and 700oC) for 2 hours in a air atmosphere. The structural and electrical properties of a-0.5SZTO TFTs weremeasured using X-ray diffraction and a semiconductor analyzer. As annealing temperature increased from 300oCto 500oC, no peak was observed. This provided crystalline properties indicating that the amorphous phase wasobserved up to 500℃oC. The electrical properties of a-0.5SZTO TFTs, such as the field effect mobility (μFE) of 24.31 cm2/Vs, on current (ION) of 2.38×10-4 A, and subthreshold swing (S.S) of 0.59 V/decade improved with the thermal annealingtreatment. This improvement was mainly due to the increased carrier concentration and decreased structural defectsby rearranged atoms. However, when a-0.5SZTO TFTs were annealed at 700oC, a crystalline peak was observed. Asa result, electrical properties degraded. μFE was 0.06 cm2/Vs, ION was 5.27×10-7 A, and S.S was 2.09 V/decade. Thisdegradation of electrical properties was mainly due to increased interfacial and bulk trap densities of forming grainboundaries caused by the annealing treatment.

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