• 제목/요약/키워드: Heterostructure

검색결과 247건 처리시간 0.044초

액상에피층 성장방법에 의한 AlGaAs/GaAs 이중 헤테로 구조의 성장과 LED의 제작 (Growing of AlGaAs/GaAs Double-Heterostructure by the Liquid Phase Epitaxy Method and Fabrication of the Light Emitting Diode)

  • 이원성;권영세
    • 대한전자공학회논문지
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    • 제21권5호
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    • pp.11-16
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    • 1984
  • 본 논문에서는 III-V족 반도체 소자의 제작에 사용되는 액상 에피층 성장 시스템의 제작 및 이를 이용한 AIGaAs/GaAs 이중 헤테로 구조의 성장 방법에 관하여 고찰하였다. 또한 이 헤테로 구조가 발광 다이오드에 이용될 수 있음을 확인하였다.

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Development of Colloidal Quantum Dots for Electrically Driven Light-Emitting Devices

  • Han, Chang-Yeol;Yang, Heesun
    • 한국세라믹학회지
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    • 제54권6호
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    • pp.449-469
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    • 2017
  • The development of quantum dots (QDs) has had a significant impact on various applications, such as solar cells, field-effect transistors, and light-emitting diodes (LEDs). Through successful engineering of the core/shell heterostructure of QDs, their photoluminescence (PL) quantum yield (QY) and stability have been dramatically enhanced. Such high-quality QDs have been regarded as key fluorescent materials in realizing next-generation display devices. Particularly, electrically driven (or electroluminescent, EL) QD light-emitting diodes (QLED) have been highlighted as an alternative to organic light-emitting diodes (OLED), mostly owing to their unbeatably high color purity. Structural optimizations in QD material as well as QLED architecture have led to substantial improvements of device performance, especially during the past decade. In this review article, we discuss QDs with various semiconductor compositions and describe the mechanisms behind the operation of QDs and QLEDs and the primary strategies for improving their PL and EL performances.

2 차원 금속칼코겐 화합물인 GaSe-InS Lateral Heterostructure 의 계면 구조 및 전자 구조 연구

  • 윤예빈;차선경
    • EDISON SW 활용 경진대회 논문집
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    • 제5회(2016년)
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    • pp.326-329
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    • 2016
  • 2차원 metal monochalchogenides(MMC) 물질들 중 lattice mismatch가 가장 적은 GaSe와 InS의 $8{\times}1$ lateral heterostructure의 계면 원자 구조와 전자 구조를 Linear combination of atomic orbital 제일원리계산을 이용하여 연구하였다. Arm-chair 와 zigzag 계면에 대해 각각 두 가지 원자 구조를 고려하여 총 네 가지 계면 구조 모델을 정립하고, 각각의 계면에 대해 GaSe-InS의 비율을 다섯 단계(2:6, 3:5, 4:4, 5:3, 6:2)로 바꾸어 가며 relax된 원자구조의 특성과 계면 형성 에너지를 구하였다. 또한, 계면 전자구조 분석을 위하여, 계면으로부터의 위치에 따른 projected density of states의 변화를 규명하였다.

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저압화학증착을 이용한 실리콘-게르마늄 이종접합구조의 에피성장과 소자제작 기술 개발 (Development of SiGe Heterostructure Epitaxial Growth and Device Fabrication Technology using Reduced Pressure Chemical Vapor Deposition)

  • 심규환;김상훈;송영주;이내응;임정욱;강진영
    • 한국전기전자재료학회논문지
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    • 제18권4호
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    • pp.285-296
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    • 2005
  • Reduced pressure chemical vapor deposition technology has been used to study SiGe heterostructure epitaxy and device issues, including SiGe relaxed buffers, proper control of Ge component and crystalline defects, two dimensional delta doping, and their influence on electrical properties of devices. From experiments, 2D profiles of B and P presented FWHM of 5 nm and 20 nm, respectively, and doses in 5×10/sup 11/ ∼ 3×10/sup 14/ ㎝/sup -2/ range. The results could be employed to fabricate SiGe/Si heterostructure field effect transistors with both Schottky contact and MOS structure for gate electrodes. I-V characteristics of 2D P-doped HFETs revealed normal behavior except the detrimental effect of crystalline defects created at SiGe/Si interfaces due to stress relaxation. On the contrary, sharp B-doping technology resulted in significant improvement in DC performance by 20-30 % in transconductance and short channel effect of SiGe HMOS. High peak concentration and mobility in 2D-doped SiGe heterostructures accompanied by remarkable improvements of electrical property illustrate feasible use for nano-sale FETs and integrated circuits for radio frequency wireless communication in particular.