Surfaces

Surfaces - University of California, Berkeley EE230 - Solid...

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University of California, Berkeley EE230 - Solid State Electronics Prof. J. Bokor Surfaces.fm Surfaces Caution : STM, synchrotron radiation experiments and other modern techniques have rendered much of the hand-waving about surface states in most older textbooks obsolete. Preparation of “clean” surfaces • “Perfect” free surfaces are obtainable in ultra-high-vacuum (UHV). In the UHV environ- ment, such surfaces remain uncontaminated for hours or even days. This makes it possible to perform detailed experiments on the intrinsic properties of surfaces. More recently, unique materials processing methods are being developed under UHV conditions. • Cleavage: Si and Ge “cleave” at (111) planes. If done in UHV this is a convenient way to form flat, clean surfaces. GaAs, other zinc-blende’s cleave at (110) planes. • Clean surfaces can be sometimes formed by careful chemical treatment in the ambient lab- oratory environment to prepare a thin surface oxide. After transferring such a sample into
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Surfaces - University of California, Berkeley EE230 - Solid...

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