Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Optical properties of HgTe and HgTe/CdTe core-shell structured nanocrystals

HgTe와 HgTe/CdTe core-shell 구조의 나노입자의 광학적 특성 비교

  • Park, Byoung-Jun (Department of Electrical Engineering, Korea University) ;
  • Kim, Hyun-Suk (Department of Electrical Engineering, Korea University) ;
  • Cho, Kyoung-Ah (Department of Electrical Engineering, Korea University) ;
  • Kim, Jin-Hyong (Department of Electrical Engineering, Korea University) ;
  • Lee, Joon-Woo (Department of Electrical Engineering, Korea University) ;
  • Kim, Sang-Sig (Department of Electrical Engineering, Korea University)
  • Published : 2004.07.05
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Abstract

HgTe and HgTe/CdTe core-shell structured nanocrystals(NCs) were synthesized in aqueous solution by colloidal method. HgTe and HgTe/CdTe NCs structure showed very similar XRD patterns because of the same lattice constant and crystal structure of both samples. The absorption and photoluminescence(PL) spectrum of the synthesized HgTe NCs revealed the strong exitonic peak in the IR region. The PL spectrum of HgTe/CdTe NCs have the intense peak in about 700nm shorter than that of HgTe by 400nm. The photocurrent measurement of colloidal NCs are performed using He-Ne laser for light source. The photocurrent of HgTe NCs shows the instant increased current response to light, but HgTe/CdTe NCs revealed a decreased current when lighted to the sample. In the vacuum condition, it shows reverse result that current increased under the illumination of light and it is thought that the molecules like the hydro-oxygen gas in the air give an important effect on the current mechanism.

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