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Homework Help: Semiconductor problem

  1. Apr 8, 2013 #1
    1. The problem statement, all variables and given/known data

    The resistivity at room temperature of intrinsic silicon is 2.3*103 Ωm and that of an "n" type extrinsic silicon sample is 8.33*10-2Ωm . A bar of this extrinsic silicon with 50*1000 mm has a steady current of 100μA across it. The voltage across the bar is found to be 50 mVolt.If the same bar is of intrinsic silicon,the voltage across the bar will be ?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 8, 2013 #2


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    Staff: Mentor

    I think you forgot to fill out part 2 and 3 of the homework template. In other words: What do you know about conduction? What did you do so far? Where did you run into problems?
  4. Apr 8, 2013 #3
    The thing is i solved the question by using ohm's law but when i asked someone they said current flow through semiconductor is not linear and it won't follow V=IR so that is why i was confused.
  5. Apr 8, 2013 #4


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    Gold Member

    There is a point where deviations from Ohm's law appear due to collision processes caused by very high internal electric fields. This is called the "hot electron" regime. It takes some effort to get there, however, so you needn't worry about it for common and practical systems. Ohm's law works fine in general.
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