Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
권호 표지

A Study on Fabrication of $ZnSe_{1-x}:Te_x$ Thin Films and Their OPtical Properties

$ZnSe_{1-x}:Te_x$ 박막의 제작과 광학적 특성에 관한 연구

  • 이홍찬 (한국해양대학교 선박전자기계공학부)
  • Published : 2006.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, systematical investigations were carried out on crystal qualifies and optical properties of $ZnSe_{1-x}:Te_x$ (x=0.002-0.04) thin films frown by molecular beam epitaxy (MBE). The crystal qualifies and optical properties have been investigated by X-ray diffraction (XRD) and Photoluminescence (PL) measurements, respectively. From the XRD measurements, the crystallographic characteristics showed mediocre crystal quality with increasing the Te composition. From the PL measurements, emission in the visible spectrum region from blue to green was obtained by varying the Te content of the ZnSe:Te epilayers. The efficient blue and green emission were attributed to the recombination of excitons trapped at isoelectronic isolated a single Te atom and $Te_n(n{\geq}2)$ clusters. respectively. The blue emission become dominant in Te tightly doped $ZnSe_{1-x}:Te_x$ $(Te=0.2\%)$ epilayers with increasing temperature. For the Te heavily doping condition $(Te=4.0\%)$, the dominant green emission could be observed at around 160K.

Keywords

References

  1. http://icat.snu.ac.kr:8000/ '백색LED 기술동향 News'
  2. D. Lee, A. Mysyrowicz, and A. V. Nurmikko, 'Exciton Self-Trapping in ZnSe-ZnTe Alloys', Physical Review Letters, Vol. 58, No. 14, pp. 1475-1478, 1987 https://doi.org/10.1103/PhysRevLett.58.1475
  3. C.D. Lee, H.L Park, C.H. Chung, and S.K. Chang, 'Free-exciton luminescence from $ZnSe_{1-x}:Te_x$', Phys. Rev. B, Vol. 45, pp. 4491-4493, 1992 https://doi.org/10.1103/PhysRevB.45.4491
  4. J. L Merz, K. Nassau, and J. W. Shiever, 'Pair Spectra and the Shallow Acceptors in ZnSe', Phys. Rev. B 8, pp. 1444-1452, 1973 https://doi.org/10.1103/PhysRevB.8.1444
  5. H. C. Lee, T. Abe, M. Watanabe, Z. M. Aung, M. Adachi, T. Shirai, H. Yamada, S. Kuroda, H. Kasada, and K. Ando, 'Efficient blue-green light-emitting diodes of ZnSSe:Te/ZnMgSSe DH structure grown by molecular-beam epitaxy', Journal of Crystal Growth, Vol. 214/215, pp. 1096-1099, 2000 https://doi.org/10.1016/S0022-0248(00)00281-5
  6. C. S. Yang, D. Y. Hong, C. Y. Lin, W. C. Chou, C. S. Ro, W. Y. Den, W H. Lan, and S. L. Tu, 'Optical Properties of the $ZnSe_{1-x}:Te_x$, epilayers grown by MBE', Tu. Journal of Applied Physics, Vol. 83, No. 5, pp. 2555-2559, 1998 https://doi.org/10.1063/1.367015
  7. D. S. Jiang, H. Jung, and K. Ploog, 'Temperature dependence of PL from GaAs single and multiple quantum-well hetero-structures grown by MBE', Journal of Applied Physics, Vol. 64, No. 3, pp. 1371- 1377, 1988 https://doi.org/10.1063/1.341862