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I need to know this for my project- "power generation using the pressure applied on a keypad of a mobile electronic device". How much pressure does it take to displace a single electron off its crystal structure so that it is suitable for generating piezo-electricity?

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I think this would be highly dependent on the specific crystal structure and how tightly the electron is bound –  Michiel Mar 18 '13 at 6:39
piezoelectricity is a collective phenomenn, so there is no way to calculate pressure for a single electron ( a quantum mechanical interaction, therefore probabilistic). This might help you in your project bigind.com.my/intranet/fckeditor/editor/images/smiley/66.pdf. –  anna v Mar 18 '13 at 7:30
Thank You! Sir @anna v . ur attatched file is so informative. –  user1929614 Mar 19 '13 at 5:45

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