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单词 contact potential difference
释义
contact potential difference

Physics
  • The potential difference that occurs between two electrically connected metals or between the base regions of two semiconductors. If two metals with work functions ϕ‎1 and ϕ‎2 are brought into contact, their Fermi levels will coincide. If ϕ‎1 > ϕ‎2 the first metal will acquire a positive surface charge with respect to the other at the area of contact. As a result, a contact potential difference occurs between the two metals or semiconductors.


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