e band that forms the combined antibonding (o called the conduction band. In sem
ID: 1002397 • Letter: E
Question
e band that forms the combined antibonding (o called the conduction band. In semiconductor the s filled with electrons and the conduction band is wo bands are separated by the band gap (E.) of 2 Table 1-Band Gap Energies Semiconductor Band Gap Material ev 1.11 2.43 Gap 2.26 0.67 GaAs 1.43 2.58 3.05 Sn (grey). 0.18 CdTe 1.5 O Part F semiconductors have a wide range orconductrity as shown in (Figure 2) Which compound shown in Figure 2 is the better conductor? Submit My Answers Give Up Incorrect, Try Again Part G What is the average number of valence electrons for aluminum and phosphorus (AP)? Please choose Submit My Answers Give Up Part H this the case for all the other compounds listed in (Figure 2) Please Choose bmitExplanation / Answer
F) In case of semiconductors, as the energy gap between conduction band (C.B) and valence band (V.B.) decreases ease of conduction increases. Because with small energy input electrons jumps in C.B from V.B.
I.e. Smaller is the Band gap energy higher is the conductivity of material.
On observation of Table of Band gap energy it’s clear that Sn (grey) has least Band Gap Energy i.e. 0.08 eV and hence is the best semiconducting material among given.
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G)
Excited state Valence shell electronic configurations of Aluminium Al (Z = 13) and Phosphorus P (Z = 15) is,
Excited state V.S.E.C of Al: [Ne] 3s1 3px1 3py1 3pz.
Number of valence electrons = 3
V.S.E.C of Al: [Ne] 3s2 3px1 3py1 3pz1
Number of valence electrons = 5
Hence average valence electrons in P-type semiconductor Al-P = (3+5)/2 = 8/2 = 4.
Average valence electrons in Al-P is 4.
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