Qhov sib txawv tseem ceeb ntawm tus neeg pub dawb thiab tus neeg txais khoom tsis huv yog tias cov ntsiab lus hauv pawg V ntawm lub sijhawm lub sijhawm feem ntau ua raws li tus neeg pub khoom tsis huv thaum cov ntsiab lus hauv pawg III feem ntau ua raws li kev lees txais impurities.
Doping yog txheej txheem uas ntxiv impurities rau ib lub semiconductor. Doping yog ib qho tseem ceeb hauv kev nce cov conductivity ntawm semiconductor. Muaj ob hom kev doping tseem ceeb, thiab lawv yog tus pub doping thiab txais doping. Tus neeg pub doping ntxiv impurities rau tus neeg pub dawb whereas tus txais doping ntxiv impurities rau tus txais.
Tus pub dawb yog dab tsi?
Tus pub dawb yog cov khoom ntxiv rau tus neeg pub dawb kom nce hluav taws xob conductivity ntawm tus neeg pub khoom. Cov ntsiab lus nyob rau hauv pawg V ntawm lub sij hawm lub sij hawm yog cov neeg pub dawb impurities. Tus neeg pub dawb yog ib qho atom lossis ib pawg ntawm cov atoms uas tuaj yeem tsim cov cheeb tsam n-hom thaum ntxiv rau ib lub semiconductor. Ib qho piv txwv yog silicon (Si).
Daim duab 1: Kev Pom Zoo ntawm tus neeg pub dawb hauv Silicone Lattice
Cov pab pawg V cov ntsiab lus uas feem ntau ua haujlwm pub dawb muaj xws li arsenic (As), phosphorus (P), bismuth (Bi), thiab antimony (Sb). Cov ntsiab lus no muaj tsib lub tshuab hluav taws xob hauv lawv lub plhaub sab nraud (muaj tsib lub valence electrons). Thaum ntxiv ib qho ntawm cov atoms no rau tus neeg pub khoom xws li silicon, cov impurity hloov cov silicon atom, tsim plaub covalent bonds. Tab sis, tam sim no muaj ib tug dawb electron vim muaj tsib valence electrons. Yog li ntawd, qhov no electron nyob twj ywm raws li ib tug dawb electron, uas tsub kom lub conductivity ntawm semiconductor. Tsis tas li ntawd, tus naj npawb ntawm impurity atoms txiav txim seb tus naj npawb ntawm cov electrons dawb tam sim no nyob rau hauv tus neeg pub dawb.
Dab tsi yog Txais Cov Khoom Siv Tsis Txaus?
Acceptor impurities yog cov ntsiab lus ntxiv rau tus neeg txais khoom kom nce cov hluav taws xob conductivity ntawm tus neeg txais. Cov ntsiab lus nyob rau hauv pawg III yog ib qho kev lees txais impurities. Cov ntsiab lus hauv pawg III suav nrog txhuas (Al), boron (B), thiab gallium (Ga). Tus neeg txais yuav yog ib qho dopant uas tsim cov cheeb tsam p-hom thaum ntxiv rau ib qho semiconductor. Cov atoms no muaj peb valence electrons nyob rau hauv lawv cov sab nrauv electron plhaub.
Daim duab 2: Kev Pom Zoo ntawm Tus Txais hauv Silicon Lattice
Thaum ntxiv ib qho ntawm cov impurity atoms xws li txhuas rau tus neeg txais, nws hloov cov silicon atoms hauv semiconductor. Ua ntej qhov sib ntxiv no, silicon atom muaj plaub covalent bonds nyob ib puag ncig nws. Thaum txhuas siv txoj haujlwm ntawm silicon, aluminium atom tsuas yog peb covalent daim ntawv cog lus, uas nyob rau hauv lem, ua rau tsis muaj covalent daim ntawv cog lus. Qhov no tsim ib qho chaw tsis muaj lossis lub qhov. Txawm li cas los xij, cov qhov no muaj txiaj ntsig zoo hauv kev ua hluav taws xob. Thaum tus naj npawb ntawm impurity atoms ntxiv nce, tus naj npawb ntawm qhov muaj nyob rau hauv semiconductor kuj nce. Qhov no ntxiv, nyob rau hauv lem, nce lub conductivity. Tom qab ua tiav cov txheej txheem doping, lub semiconductor dhau los ua ib qho khoom siv hluav taws xob.
Dab tsi yog qhov txawv ntawm tus pub thiab txais qhov tsis zoo?
Tus pub vs tus txais tsis raug |
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| Tus pub dawb yog cov khoom ntxiv rau tus neeg pub dawb kom nce hluav taws xob conductivity ntawm tus neeg pub dawb. | Acceptor impurities yog cov ntsiab lus ntxiv rau tus neeg lees paub kom nce cov hluav taws xob conductivity ntawm tus neeg txais. |
| Common Impurities | |
| Group V element | Group III ntsiab |
| Examples of Impurities | |
| Arsenic (As), phosphorus (P), bismuth (Bi), thiab antimony (Sb). | Aluminium (Al), boron (B), thiab gallium (Ga) |
| txheej txheem | |
| Ntawm cov electrons dawb hauv cov semiconductor. | Txhob qhov muaj nyob hauv cov khoom siv hluav taws xob. |
| Valence Electrons | |
| Atoms muaj tsib valence electrons. | Atoms muaj peb valence electrons. |
| Covalent Bonding | |
| Forms plaub covalent bonds hauv semiconductor, tawm hauv tsib lub electron ua ib tug dawb electron. | Form peb covalent bonds hauv semiconductor, tawm hauv lub qhov uas tsis muaj covalent daim ntawv cog lus. |
Summary – Pub vs Txais Tsis Muaj Cai
Semiconductors yog cov khoom siv hluav taws xob ntawm cov khoom siv hluav taws xob uas tsis yog cov khoom siv thiab cov hlau uas yog cov khoom siv hluav taws xob. Cov neeg pub dawb thiab cov neeg txais khoom yog dopants uas tsim cov cheeb tsam conductive hauv semiconductors. Lub doping ntawm pub thiab txais yog cov txheej txheem uas ua rau kom cov hluav taws xob conductivity ntawm semiconductor. Qhov sib txawv tseem ceeb ntawm tus neeg pub dawb thiab tus neeg txais cov impurities yog tias cov ntsiab lus hauv pawg III ntawm lub rooj sib tham ua raws li tus neeg pub khoom tsis huv thaum cov ntsiab lus hauv pab pawg V ua raws li kev lees txais impurities.
