实用文档
(a)
kT??0.0259???375??300???0.032375eV
no??3/24.7?1017???375???exp???0.28?300??0.032375?? ?1.15?1014cm?3
EF?E??Eg??Ec?EF??1.42?0.28 ?1.14eV
2p???375?3/o7?1018???300??exp???1.14??0.032375?? ?4.99?103cm?3 (b) EE?4.7?1017?c?F??0.0259?ln????1.15?1014??
?0.2154eV
EF?E??Eg??Ec?EF??1.42?0.2154 ?1.2046eV
p??1018?exp???1.2046?o?7?0.0259?? ?4.42?10?2cm?3
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4.21
(a) kT??0.0259???375??300???0.032375eV
n?8?1019??3/2?375?o?2.?300??exp???0.28??0.032375?? ?6.86?1015 cm?3
EF?E??Eg??Ec?EF??1.12?0.28 ?0.840eV 3/2po??1.04?1019???375???exp???0.840?300??0.032375?? ?7.84?107cm?3
(b) EE?Nc?c?F?kTln????no??
??0.0259?ln???2.8?1019??6.862?1015???
?0.2153eV
EF?E??1.12?0.2153?0.9047eV
p?.04?1019?exp???0.904668?o?1?0.0259?? ?7.04?103cm?3
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4.22
(a) p-type
(b) EEg1.12F?E??4?4?0.28eV
p???EF?E???o?N?exp??kT?? ??1.04?1019?exp???0.28??0.0259??
?2.10?1014cm?3 Ec?EF?Eg??EF?E?? ?1.12?0.28?0.84eV
nN???Ec?EF??o?cexp??kT?? ??2.8?1019?exp???0.84??0.0259?? ?2.30?105cm?3
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4.23
(a) n?EF?EFi?o?niexp??kT??
??1.5?1010?exp??0.22??0.0259?? ?7.33?1013cm?3
p?n?E?EF?oiexp?Fi?kT??
??1.5?1010?exp???0.22??0.0259??
半导体物理与器件第四版课后习题问题详解4
