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Proceedings Paper

Study on the subband structure of HgCdTe surface by electron tunneling spectroscopy
Author(s): Jin-Ki Hong; Yun Chul Chung; In-Jae Kim; Dong-Yun Shin; Eun-Sung Kim; Il-Soo Choi; Ki-Hyun Kim; Young-Taek Song; Jeong-Chil Shim; Young Hun Kim; Ki-Nam Oh; Suk-Kyoung Hong; Sun-Ung Kim; Mann-Jang Park; S. S. Jeon
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Paper Abstract

In order to investigate the surface states of electron which can tunnel through the sufficiently thin insulator, the electron tunneling spectroscopy is used to measure the tunneling current in function of the bias voltage, and directly to get the subbands of accumulation layer. The tunneling current through ZnS barrier in the Hg1-xCdxTe-ZnS-In junction structure is measured by various applied bias at 77 K and 4.2 K. From the measurement at 77 K, the subband energy levels in the electron accumulation layer at the surface of n-type Hg1-xCdxTe are found to be located at -59 meV for the ground state and -13 meV for the first excited state relative to the Fermi level of Hg1-xCdxTe. At low temperature when the applied bias is larger than the difference between the work function of In and the electron affinity of ZnS, a negative differential resistance is measured. On the calculation using transfer matrix method it is understood that this negative conductance is attributed to Fowler-Nordheim tunneling which is caused by the variation of ZnS barrier according to the various applied bias.

Paper Details

Date Published: 26 October 1998
PDF: 6 pages
Proc. SPIE 3436, Infrared Technology and Applications XXIV, (26 October 1998); doi: 10.1117/12.328010
Show Author Affiliations
Jin-Ki Hong, Korea Univ. (South Korea)
Yun Chul Chung, Korea Univ. (South Korea)
In-Jae Kim, Korea Univ. (South Korea)
Dong-Yun Shin, Korea Univ. (South Korea)
Eun-Sung Kim, Korea Univ. (South Korea)
Il-Soo Choi, Korea Univ. (South Korea)
Ki-Hyun Kim, Korea Univ. (South Korea)
Young-Taek Song, Korea Univ. (South Korea)
Jeong-Chil Shim, Korea Univ. (South Korea)
Young Hun Kim, Korea Univ. (South Korea)
Ki-Nam Oh, Korea Univ. (South Korea)
Suk-Kyoung Hong, Korea Univ. (South Korea)
Sun-Ung Kim, Korea Univ. (South Korea)
Mann-Jang Park, Korea Univ. (South Korea)
S. S. Jeon, Korea Univ. (South Korea)


Published in SPIE Proceedings Vol. 3436:
Infrared Technology and Applications XXIV
Bjorn F. Andresen; Marija Strojnik, Editor(s)

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