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我想瘦 asked in 科學其他:科學 · 1 decade ago


麻煩哪位好心人士可以解釋一下蕭特基效應(Schottky Effect)


1 Answer

  • ?
    Lv 5
    1 decade ago
    Favorite Answer

    「蕭特基效應(Schottky Effect)」:由於外加電場使受熱物質表面發射電子所需的能量降低,因而從表面逸出的電子增多的現象。從某一特定物質表面逸出一個電子所需的最低能量(功函數)是由熱能提供的。加上很弱的外電場可能只會把已經從物質表面發射出的電子吸走。外場增到一定值,功函數值就降低;外場繼續增大,功函數也隨著繼續降低,於是電子發射流繼續增大。但是,若外場到達甚高值,電子發射要逾量增大,因為這時又開始發生另一不同類型的發射,稱為場致發射。

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