Основы физики и химии полупроводников - 56 стр.

UptoLike

A
R
Ƚ
L
1
2
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Ɋɢɫ. 32. Ʉɨɦɩɟɧɫɚɰɢɨɧɧɚɹ ɫɯɟɦɚ ɢɡɦɟɪɟɧɢɹ ɭɞɟɥɶɧɨɣ
ɷɥɟɤɬɪɨɩɪɨɜɨɞɧɨɫɬɢ ɞɜɭɯɡɨɧɞɨɜɵɦ ɦɟɬɨɞɨɦ
ȼ ɩɪɚɤɬɢɤɟ ɫɨɜɪɟɦɟɧɧɨɣ ɦɢɤɪɨɷɥɟɤɬɪɨɧɢɤɢ ɧɚɢɛɨɥɟɟ ɱɚɫɬɨ
ɩɪɢɯɨɞɢɬɫɹ ɢɦɟɬɶ ɞɟɥɨ ɫ ɨɛɪɚɡɰɚɦɢ ɩɥɨɫɤɨɣ ɮɨɪɦɵ (ɤɪɟɦɧɢɟɜɵɟ
ɩɥɚɫɬɢɧɵ, ɩɨɥɭɩɪɨɜɨɞɧɢɤɨɜɵɟ ɩɥɟɧɤɢ ɢ ɬ. ɞ.). Ⱦɥɹ ɬɚɤɢɯ ɨɛɪɚɡɰɨɜ ɛɵɥ
ɪɚɡɪɚɛɨɬɚɧ ɫɩɟɰɢɚɥɶɧɵɣ ɦɟɬɨɞ ɢɡɦɟɪɟɧɢɹ ɷɥɟɤɬɪɨɮɢɡɢɱɟɫɤɢɯ ɫɜɨɣɫɬɜ,
ɧɚɡɵɜɚɟɦɵɣ ɦɟɬɨɞɨɦ ȼɚɧ ɞɟɪ ɉɚɭ. Ⱦɨɫɬɨɢɧɫɬɜɨɦ ɞɚɧɧɨɝɨ ɦɟɬɨɞɚ ɹɜɥɹɟɬɫɹ
ɟɝɨ ɧɟɡɚɜɢɫɢɦɨɫɬɶ ɨɬ ɮɨɪɦɵ ɤɪɚɹ ɩɥɨɫɤɨɝɨ ɨɛɪɚɡɰɚ.
ȼ ɫɥɭɱɚɟ ɢɡɦɟɪɟɧɢɹ ɭɞɟɥɶɧɨɝɨ ɫɨɩɪɨɬɢɜɥɟɧɢɹ ɫɭɳɧɨɫɬɶ ɦɟɬɨɞɚ
ɡɚɤɥɸɱɚɟɬɫɹ ɜ ɫɥɟɞɭɸɳɟɦ. ɇɚ ɩɟɪɢɮɟɪɢɢ ɩɥɨɫɤɨɝɨ ɨɛɪɚɡɰɚ (ɪɢɫ. 33)
ɫɨɡɞɚɸɬɫɹ ɱɟɬɵɪɟ ɤɨɧɬɚɤɬɚ – A, B, C ɢ D:
Ɋɢɫ. 33. ɋɯɟɦɚ ɪɚɫɩɨɥɨɠɟɧɢɹ ɡɨɧɞɨɜ ɩɪɢ ɢɡɦɟɪɟɧɢɢ ɷɥɟɤɬɪɨɮɢɡɢɱɟɫɤɢɯ
ɫɜɨɣɫɬɜ ɩɨɥɭɩɪɨɜɨɞɧɢɤɨɜ ɦɟɬɨɞɨɦ ȼɚɧ ɞɟɪ ɉɚɭ
ɂɡɦɟɪɹɸɬɫɹ ɞɜɚ ɫɨɩɪɨɬɢɜɥɟɧɢɹ: R
ABCD
= U
CD
/I
AB
ɢ R
BCDA
= U
DA
/I
BC.
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