In which of the three semiconducting materials listed in Table 20.1 do impurities supply free charges?
(Hint: Examine the range of resistivity for each and determine whether the pure semiconductor has the higher or lower conductivity.)
Germanium is a semiconducting material.
A semiconductor material has a flow of charge because of impurities. Higher
numbers of free electrons will participate in the flow of a higher current, which
means lower resistance.
After observing the range of resistivity of the three materials, it is easy to tell that
Germanium has the least resistivity (less than one). The lesser the resistivity, the
greater the conductivity of a material. Hence Germanium is more conductive (because
the impurities supply free charges).
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