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Nonselective germanium deposition by UHV/CVD

Image Number 9 for United States Patent #5286334.

A method of depositing Ge on a Si substrate in a reaction chamber includes the steps of: precleaning the substrate; evacuating the chamber to a pressure below 10.sup.-7 Torr; heating the substrate to C.; and providing a GeH.sub.4 /B.sub.2 H.sub.6 /He mixture of gas with a GeH.sub.4 partial pressure of 2-50 mTorr and a B.sub.2 H.sub.6 partial pressure of 0.08 to 2 mTorr.

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