Q4 solns - Name: EE138: Quiz #4 Note: The quiz is closed...

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Unformatted text preview: Name: EE138: Quiz #4 Note: The quiz is closed book and closed note. With the exception of your calculator, the use of all electronic devices is prohibited. Please write your answers clearly. You have 15 minutes. A sample of silicon is doped with indium for which the electron acceptor level (EA) is 160 meV above the top of the valence band. (a) Is this semiconductor material doped n-type, p~type, or intrinsic? (5 pts.) _ 'P‘WFQ' p (b) What is the majority carrier in this semiconductor? (5 pts.) \nolas (c) Sketch the band diagram for this material. Clearly label the conduction band edge, valence band edge, and the acceptor level (EA). (10 pts.) (d) Write a general equation describing the charge neutrality condition in this semiconductor. (10 pts.) negative cleavage = Fosilwc emf LS N; + Na? M7ho NE’FNU’ Mb (e) What impurity density (NA) would cause the Fermi level (EF) to coincide with the acceptor level (EA) at 300 K? (70 pts.) mg: 0.59) mo 1 (Mb: 037qu N3 ‘ NA WED EptEAr-O-HoeV% Ha): J9: "N644N‘h : "Nk/ZK’V’Nh N ‘ 2 2w * \LT 3/7" “E? h‘ mwfil‘flfl a)? W - W“ . 3/ - —" «2 "' 600v. 7" __ 0.19491 :"2 zfiflflwo 51 l.§%XiL25 2k ex NH (H F .(meto’ {xi/mm 2. ‘- " Nb:— i.2.La>L|o"" m3 :> N». -=- 2M =— 2.55XlDsz75 (f) What fraction of the acceptor levels is filled in (d)? (10 pts.) The Farm low/l Calhcrolag w/ HM, aCcapiLofh EF'PEA PC9399” '¢(Efl§= 1-2: a? We, qCCQPlW was 0w“ “1‘ 'Q'illfidl; 2 .0 5'1223995xwaz ...
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Q4 solns - Name: EE138: Quiz #4 Note: The quiz is closed...

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