Real-time control of HgCdTe growth by organometallic vapor phase epitaxy using spectroscopic ellipsometry |
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Authors: | Srikanteswara Dakshina Murthy Ishwara Bhat Blaine Johs Shakil Pittal Ping He |
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Affiliation: | (1) ECSE Department, Rensselaer Polytechnic Institute, 12180 Troy, NY;(2) J.A. Woollam Co., 650 J Street, Suite 39, 68508 Lincoln, NE |
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Abstract: | The use of spectroscopic ellipsometry for monitoring the vapor phase epitaxial growth of mercury cadmium telluride (Hg1−xCdxTe) in real-time is demonstrated. The ellipsometer is used to perform system identification of the chemical vapor deposition
reactor used for the growth of CdTe and to measure the response of the reactor to different growth conditions. The dynamic
behavior of the reactor is also studied by evaluating the gas transport delay. The optical constants of Hg1−xCdxTe are determined at the growth temperature for different compositions.In-situ real-time composition control is performed during the growth of Hg1−xCdxTe. The required target compositions are attained by the ellipsometer and appropriate corrections are also made by the controller
when a noise input in the form of a temperature variation is introduced. |
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Keywords: | HgCdTe in-situ monitoring real-time control spectroscopic ellipsometry |
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