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Materiale electrotehnice

Materiale electrotehnice. II Conductia electrica 4. Conductia electrica a semiconductorilor. Structura disciplinei. Conductia electrica a semiconductorilor. σ = 10 -6 – 10 5 S/m tip n tip p semiconductor intrinsec semiconductori extrinseci

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Materiale electrotehnice

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  1. Materiale electrotehnice II Conductia electrica 4. Conductia electrica a semiconductorilor Materiale electrotehnice Prof.dr.ing.Florin Ciuprina Facultatea de Energetica, 2009-2010, anul III ISE

  2. Structura disciplinei

  3. Conductia electrica a semiconductorilor σ = 10-6 – 105 S/m tip n tip p semiconductor intrinsec semiconductori extrinseci wi = 10-2 – 10-1 eV wi = 0.5 – 1.5 eV

  4. 4. Conductia electrica a semiconductorilor 4.1 Conductia semiconductorilor intrinseci 4.2 Conductia semiconductorilor extrinseci 4.3 Dependenta conductivitatii semiconductorilor de temperatura 4.4 Jonctiunea p-n 4.5 Aplicatii ale materialelor semiconductoare

  5. 4. Conductia electrica a semiconductorilor 4.1 Conductia semiconductorilor intrinseci 4.2 Conductia semiconductorilor extrinseci 4.3 Dependenta conductivitatii semiconductorilor de temperatura 4.4 Jonctiunea p-n 4.5 Aplicatii ale materialelor semiconductoare

  6. 4.1 Conductia semiconductorilor intrinseci

  7. 4. Conductia electrica a semiconductorilor 4.1 Conductia semiconductorilor intrinseci 4.2 Conductia semiconductorilor extrinseci 4.3 Dependenta conductivitatii semiconductorilor de temperatura 4.4 Jonctiunea p-n 4.5 Aplicatii ale materialelor semiconductoare

  8. 4.2 Conductia semiconductorilor extrinsecide tip n

  9. 4.2 Conductia semiconductorilor extrinsecide tip p

  10. 4. Conductia electrica a semiconductorilor 4.1 Conductia semiconductorilor intrinseci 4.2 Conductia semiconductorilor extrinseci 4.3 Dependenta conductivitatii semiconductorilor de temperatura 4.4 Jonctiunea p-n 4.5 Aplicatii ale materialelor semiconductoare

  11. 4.3 Dependenta conductivitatii semiconductorilor de temperatura

  12. 4. Conductia electrica a semiconductorilor 4.1 Conductia semiconductorilor intrinseci 4.2 Conductia semiconductorilor extrinseci 4.3 Dependenta conductivitatii semiconductorilor de temperatura 4.4 Jonctiunea p-n 4.5 Aplicatii ale materialelor semiconductoare

  13. 4.4 Jonctiunea p-n Echilibru

  14. 4.4 Jonctiunea p-n Curent electric stationar

  15. 4. Conductia electrica a semiconductorilor 4.1 Conductia semiconductorilor intrinseci 4.2 Conductia semiconductorilor extrinseci 4.3 Dependenta conductivitatii semiconductorilor de temperatura 4.4 Jonctiunea p-n 4.5 Aplicatii ale materialelor semiconductoare

  16. 4.5 Aplicatii ale materialelor semiconductoare Siliciu (Si) • cristalizeaza in retea de tip diamant • utilizari: • circuite integrate • diode • tiristoare • tranzistoare • baterii solare • traductoare Hall

  17. 4.5 Aplicatii ale materialelor semiconductoare Germaniu (Ge) • cristalizeaza in retea de tip diamant • utilizari: • diode tunel • tranzistoare • detectoare de radiatii • traductoare Hall • termometre pentru temperaturi joase

  18. 4.5 Aplicatii ale materialelor semiconductoare Seleniu (Se) • prezinta o mare varietate de stari alotropice: sticlos, amorf, cristalin • utilizari: fotoelemente, redresoare etc. Carbura de siliciu (SiC) • prezinta o mare varietate de politipuri cristaline • utilizari: varistoare si dispozitive de mare putere, rezistente la radiatii, care lucreaza la frecvente si temperaturi mari

  19. 4.5 Aplicatii ale materialelor semiconductoare Compusi semiconductori AII - BIV • ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe • utilizari: fotorezistoare, generatoare Hall, traductoare de presiune etc. Compusi semiconductori AIII - BV • InSb, InAs, InP, GaSb, GaAs, AlSb • utilizari: diode tunel, tranzistoare, in optoelectronica etc.

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