DOI QR코드

DOI QR Code

Electron Microscope Analyses of Self-aligned HgTe Nanocrystallites Induced by Controlled Precipitation Technique

  • 발행 : 2002.09.01

초록

Controlled precipitation of quasi-binary semiconductor system is newly proposed as an effective and reliable technique for the formation of well-defined and crystallographically aligned semiconductor nanostructures. Using HgTe-PbTe quasi-binary semiconductor system, self-aligned HgTe nanocrystallites distributed three dimensionally within PbTe matrix were successfully formed by the simple three step heat treatment process routinely found in age hardening process of metallic alloys. Examination of the resulting nano precipitates using conventional transmission electron microscopy (CTEM) and high resolution TEM (HRTEM) reveals that the coherent HgTe precipitates form as thin discs along the (100) habit planes making a crystallographic relation of {100}$\_$HgTe///{100}$\_$PbTe/ and [100]$\_$HgTe///[100]$\_$PbTe/. It is also found that the precipitate undergoes a gradual thickening and a faceting under isothermal aging up to 500 hours without any noticeable coarsening. These results, combined with the extreme dimension of the precipitates (4-5 nm in length and sub-nanometer in thickness) and the simplicity of the formation process, leads to the conclusion that controlled precipitation is an effective method for preparing desirable quantum-dot nanostructures.

키워드

참고문헌

  1. T. Takagahara, 'Excitonic optical nonlineahty and exciton dynamics in semiconductor quantum dots,' Phys. Rev. B, Vol. 36, No. 17, p. 9293, 1987 https://doi.org/10.1103/PhysRevB.36.9293
  2. Y. Z. Hu, M. Lindberg, and S. W. Koch, 'Theory of optically excited intrinsic semiconductor quantum dots,' Phys. Rev. B, Vol. 42, No. 3, p. 1713, 1990 https://doi.org/10.1103/PhysRevB.42.1713
  3. V. I. Klimov, A. A. Mikhailovsky, Su Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H.-J. Eisler, and M. G. Bawendi, 'Optical gain and stimulated emission in nanocrystal Quantum Dots,' Science, Vol.290,p. 314, 2000 https://doi.org/10.1126/science.290.5490.314
  4. M. Balkanski and R. F. Wallis, 'Semiconductor Physics and Applications', Oxford Univ. Press, 2000
  5. M. J. Lee and C.-U. Kim, 'Investigation on self-aligned HgTe nano-crystals induced by controlled precipitation in PbTe-HgTe quasi-binary compound semiconductor alloys,' Physica B Vol. 304, No. 1-4 p.267,2001 https://doi.org/10.1016/S0921-4526(01)00535-X
  6. J. W. Martin, 'Precipitation Hardening', Pergamon, New York, 1968
  7. G. Thomas and M. J. Goringe, 'Transmission Electron Microscopy of Materials', Wiley & Sons, New York, 1979
  8. A. P. Sutton and R. W. Balluffi, 'Interfaces in Crystalline Materials', Oxford University Press, New York, NY, 1995
  9. Man-Jong Lee, 'Mechanisms of precipitation and shape evolution of HgTe nanocrystallites in HgTe-PbTe induced by controlled precipitation technique', Ph. D. Dissertation, UTA, 2001

피인용 문헌

  1. Facile synthesis of HgTe quantum dots using the precipitation process of quasi-binary HgTe−PbTe system vol.9, pp.1, 2003, https://doi.org/10.1007/BF03027235