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Effect of Focused Ion Beam Imaging on the Crystallinity of InAs

Published online by Cambridge University Press:  18 September 2015

Wei-Chieh Chen ,
Tien-Hao Huang ,
Kuan-Chao Chen  and
Hao-Hsiung Lin
Wei-Chieh Chen
Affiliation:
Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
Tien-Hao Huang
Affiliation:
Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
Kuan-Chao Chen
Affiliation:
Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan
Hao-Hsiung Lin*
Affiliation:
Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan
*
*Corresponding author.hhlin@ntu.edu.tw
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Abstract

We investigated the effect of focused ion beam (FIB) imaging on the crystallinity of InAs using Raman scattering. A spatial correlation model was used to fit the broad band induced by FIB imaging. The fitting gives a correlation length of ~42 Å for the noisiest image condition (with an ion fluence of 7.4×1010 cm−2), implying severe damage in the surface layer of InAs. However, further increasing the fluence by several orders of magnitude only decreases the correlation length from 42 to 35 Å. We attribute the severe damage to the high beam current density and the low scanning speed of the FIB imaging process. These process conditions, along with low InAs thermal conductivity, also leads to a high local temperature in the exposed region that largely annihilated the defects and resulted in the nearly fluence-independent behavior.

Keywords

focused ion beamion imageInAscrystallinityRamanspatial correlation
Type
Materials Applications and Techniques
Information
Microscopy and Microanalysis , Volume 21 , Issue 6 , December 2015 , pp. 1426 - 1432
Copyright
© Microscopy Society of America 2015 

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