International Journal of Terahertz Science and Technology
  TST >> Vol.7, No.2, March 2014: PP. 100-107
 

Evaluation of surface carrier recombination of optically excited silicon using terahertz time-domain spectroscopy

K. A. Salek, K. Takayama, I. Kawayama *, H. Murakami and M. Tonouchi
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
* Email: kawayama@ile.osaka-u.ac.jp

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Abstract: In this study, the properties of optically excited silicon were investigated using terahertz time-domain spectroscopy (THz-TDS). The surface was illuminated with 365-nm ultraviolet (UV) light to excite charge carriers, and properties such as conductivity, charge carrier density and mobility were evaluated. The illumination effect significantly changed the conductivity as well as the surface recombination velocity (SRV) by altering the surface potential via photoexcited carriers. The SRV observed on the silicon surface varied from 1.56〜104 to 3.45〜103 cm/s, indicating that UV illumination greatly reduced the SRV depending on the photoexcited carrier density at the silicon surface.

Keywords: Terahertz spectroscopy, Silicon, UV light illumination, Surface recombination velocity.

Received: 2014-2-14

Published: 2014-6-30

Acknowledgments: This work was partially supported by Grant-in-Aid 25249049, JSAP.

Cite this article:
K. A. Salek, K. Takayama, I. Kawayama, H. Murakami and M. Tonouchi.Evaluation of surface carrier recombination of optically excited silicon using terahertz time-domain spectroscopy[J]. International Journal of Terahertz Science and Technology, 2014, Vol.7, No.2: 100-107.  DOI:10.11906/TST.100-107.2014.06.08

URL: http://www.tstnetwork.org/10.11906/TST.100-107.2014.06.08

 

 
 

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