Ceramic semiconductor zog

Nta:

Lub resistivity ntawm ceramics nrog cov khoom semiconductor yog li ntawm 10-5 ~ 107ω.cm, thiab cov khoom semiconductor ntawm cov ntaub ntawv ceramic tuaj yeem tau los ntawm doping lossis ua rau lattice defects los ntawm stoichiometric sib txawv. Ceramics siv txoj kev no suav nrog TiO2,

ZnO, CdS, BaTiO3, Fe2O3, Cr2O3 thiab SiC. Cov yam ntxwv sib txawv ntawmsemiconductor ceramicsyog tias lawv cov hluav taws xob conductivity hloov nrog ib puag ncig, uas tuaj yeem siv los ua ntau hom ceramic rhiab heev.

Xws li kub rhiab heev, gas rhiab heev, humidity rhiab, siab rhiab, lub teeb rhiab thiab lwm yam sensors. Semiconductor spinel cov ntaub ntawv, xws li Fe3O4, yog tov nrog cov ntaub ntawv uas tsis yog-conductor spinel, xws li MgAl2O4, nyob rau hauv kev tswj cov kev daws teeb meem.

MgCr2O4, thiab Zr2TiO4, tuaj yeem siv los ua cov thermistor, uas yog ua tib zoo tswj cov khoom siv uas sib txawv nrog qhov kub thiab txias. ZnO tuaj yeem hloov kho los ntawm kev ntxiv oxides xws li Bi, Mn, Co thiab Cr.

Feem ntau ntawm cov oxides no tsis muaj zog yaj hauv ZnO, tab sis deflection ntawm cov ciam teb los tsim ib txheej thaiv, thiaj li tau txais ZnO varistor ceramic cov ntaub ntawv, thiab yog ib yam khoom uas muaj kev ua tau zoo tshaj plaws hauv varistor ceramics.

SiC doping (xws li tib neeg carbon dub, graphite hmoov) tuaj yeem npajCov khoom siv semiconductornrog rau qhov kub thiab txias stability, siv los ua ntau yam kev tiv thaiv cua sov, uas yog, silicon carbon rods nyob rau hauv high kub hluav taws xob furnaces. Tswj lub resistivity thiab hla ntu ntawm SiC kom ua tiav yuav luag txhua yam xav tau

Kev khiav hauj lwm tej yam kev mob (txog 1500 ° C), ua kom nws resistivity thiab txo tus ntoo khaub lig seem ntawm lub cua sov caij yuav ua rau kom cov cua sov generated. Silicon carbon pas nrig hauv huab cua yuav tshwm sim oxidation cov tshuaj tiv thaiv, kev siv ntawm qhov kub thiab txias feem ntau txwv rau 1600 ° C hauv qab no, hom zoo tib yam ntawm silicon carbon pas nrig

Kev nyab xeeb ua haujlwm kub yog 1350 ° C. Hauv SiC, Si atom yog hloov los ntawm N atom, vim N muaj ntau cov hluav taws xob, muaj cov hluav taws xob ntau dhau, thiab nws lub zog theem yog ze rau qhov qis conduction band thiab nws yooj yim rau nce mus rau conduction band, yog li lub zog no. tseem hu ua tus pub qib, qhov no ib nrab

Cov conductors yog N-hom semiconductors lossis electronically conductors semiconductors. Yog tias Al atom siv hauv SiC los hloov Si atom, vim tsis muaj hluav taws xob, cov khoom siv hluav taws xob tsim nyob ze rau ntawm valence electron band saum toj no, nws yooj yim rau txais electrons, thiab yog li hu ua txais.

Lub zog tseem ceeb, uas tawm hauv qhov chaw tsis muaj nyob hauv valence band uas yuav ua tau cov khoom siv hluav taws xob vim tias qhov chaw tsis muaj chaw ua haujlwm zoo ib yam li cov cab kuj zoo, hu ua P-hom semiconductor lossis qhov semiconductor (H. Sarman, 1989).