Q1) Figure 1 shows the density of states, the Fermi function, and the distributi

Question

Q1) Figure 1 shows the density of states, the Fermi function, and the distribution of electrons and holes of a silicon- sample at T-300 Answer the questions 1.1. 1.7 D (E) Fig 1 (a) E, Be Energy B 2 03 Fig 1. (b) E 1 ftE) A, B Energy E 3 2 D (B) (E) Fig 1. (c) Energy B Figure 1 1.1 What is the type of this semiconductor sample (n- type, p-type, or intrinsic type)?: 1.2 What is the charge of this semiconductor (positive, negative, or neutral)? 1.3Calculate the energy state E where the distribution of electrons is maximum, with respect to Er 1.4 If the probability of occupying the state at E E by an electron equals 3.69x10 then 1.4.1 The concentration of electrons has to equal: 1.4.2 The area of (Dr Exli-soE) in Fig. 1(c) equals:

Explanation / Answer

1.1 This is a N-type Semiconductor sample according to the graph of distribution of carriers .The electron concentration in the conduction band increases as Ef moves closer to Ec ; thus, Ec- Ef gives a measure of n.

1.2 The charge of Semiconductor is Negative as majority charge Carrier is electrons.

1.3 Ei = EC Eg/2 = EV + Eg/2

At this point EF > Ei the number of electrons is maximum

EC EF = Eg/ 2 (EF Ei)

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