Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Pyrolysis Synthesis of CdSe/ZnS Nanocrystal Quantum Dots and Their Application to Light-Emitting Diodes

CdSe/ZnS 나노결정 양자점 Pyrolysis 제조와 발광다이오드 소자로의 응용

  • Kang, Seung-Hee (Division of Nano Engineering, Chungnam National University) ;
  • Kumar, Kiran (Division of Nano Engineering, Chungnam National University) ;
  • Son, Kee-Chul (Division of Nano Engineering, Chungnam National University) ;
  • Huh, Hoon-Hoe (Division of Nano Engineering, Chungnam National University) ;
  • Kim, Kyung-Hyun (Electronics and Telecommunications Research Institute) ;
  • Huh, Chul (Electronics and Telecommunications Research Institute) ;
  • Kim, Eui-Tae (Division of Nano Engineering, Chungnam National University)
  • 강승희 (충남대학교 나노공학부 재료공학과) ;
  • 키란쿠마르 (충남대학교 나노공학부 재료공학과) ;
  • 손기철 (충남대학교 나노공학부 재료공학과) ;
  • 허훈회 (충남대학교 나노공학부 재료공학과) ;
  • 김경현 (한국전자통신연구원) ;
  • 허철 (한국전자통신연구원) ;
  • 김의태 (충남대학교 나노공학부 재료공학과)
  • Published : 2008.07.27
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Abstract

We report on the light-emitting diode (LED) characteristics of core-shell CdSe/ZnS nanocrystal quantum dots (QDs) embedded in $TiO_2$thin films on a Si substrate. A simple p-n junction could be formed when nanocrystal QDs on a p-type Si substrate were embedded in ${\sim}5\;nm$ thick $TiO_2$ thin film, which is inherently an n-type semiconductor. The $TiO_2$ thin film was deposited over QDs at $200^{\circ}C$ using plasma-enhanced metallorganic chemical vapor deposition. The LED structure of $TiO_2$/QDs/Si showed typical p-n diode currentvoltage and electroluminescence characteristics. The colloidal core-shell CdSe/ZnS QDs were synthesized via pyrolysis in the range of $220-280^{\circ}C$. Pyrolysis conditions were optimized through systematic studies as functions of synthesis temperature, reaction time, and surfactant amount.

Keywords

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