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H5. (c) Explain why it is easier to achieve atomic resolution images of a semiconductor surface than a metal surface by Scanning Tunnelling Microscopy (STM).

H5.
(c) Explain why it is easier to achieve atomic resolution images of a semiconductor surface than a metal surface by Scanning Tunnelling Microscopy (STM). How does the tunnelling current of an STM depend on the tip-sample distance? What is the origin of this dependence? Write down advantages and disadvantages of STM compared to Atomic Force Microscopy

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