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Atomically resolved structure of vacuum-heated porous silicon

W Li, I Andrienko and D Haneman

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LETTER TO THE EDITOR

We report atomic resolution in scanning tunneling microscopy studies of porous silicon surfaces, after vacuum heat treatment at 850 °C and above. The (100) sample surfaces show some 2 × 1 reconstruction as for single-crystal (100) surfaces, but the (111) samples do not show any clear reconstructions, probably because the column tops are too small for large structures such as 7 × 7 to form. The atomic planes on the column tops are parallel to the substrate for both (100) and (111) samples, in agreement with low-energy electron diffraction studies.


PACS

68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)

68.47.Fg Semiconductor surfaces

81.40.Gh Other heat and thermomechanical treatments

Subjects

Semiconductors

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Dates

Issue 15 (17 April 2000)

Received 25 January 2000, in final form 2 March 2000



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