The electrical conductivity is = e(n + n h ji h ) where
Question:
The electrical conductivity is
σ = e(nεμε + nhjih)
where μe > and μh are the electron and hole mobilities. For most semiconductors μe > μh.
(a) Find the net ionized impurity concentration ∆n = nd+ – nd – for which the conductivity is a minimum. Give a mathematical expression for this minimum conductivity.
(b) By what factor is it lower than the conductivity of an intrinsic semiconductor?
(c) Give numerical values at 300 K for Si for which the mobilitics are μe 1350 and μh = 480cm2 V–3 s–1, and for InSb, for which the mobilities are μe = 77000 and μh 750cm2 V–1 s–1. Calculate missing data from Table 131,
Transcribed Image Text:
Dielectric Density-of-states cffeative masses, in units of the free electron mass Energy Quantum concentrations of clectrons and holes constants, telative to gaps at 300 K at 300 K vacuunt eV em Cm Si Ge Gals InP InSb L.1 x 10 5.2 x 10 1.5 x 109 6.9 x 10 6.2 x 10" 1.14 0.67 1.43 135 0.18 2.7 x 10* 10 x 10" 46 x 10" 0.58 0.35 0.71 11.7 15.8 1.06 056 007 0073 0015 13.13 12.37 49 x 10" 0.42 46 x 10 17.58 0.39
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