Qhov sib txawv tseem ceeb ntawm electron nplua nuj thiab electron tsis muaj impurities yog tias electron nplua nuj impurities yog doped nrog pawg 1s ntsiab xws li P thiab As, uas muaj 5 valence electrons, whereas electron-deficient impurities doped nrog pab pawg 13 ntsiab. xws li B thiab Al, uas ntawm 3 valence electrons.
Cov ntsiab lus electron-nplua nuj thiab electron-tsis muaj impurities tuaj nyob rau hauv semiconductor technology. Semiconductors feem ntau coj nyob rau hauv ob txoj kev: intrinsic conduction thiab extrinsic conduction. Nyob rau hauv intrinsic conduction, thaum hluav taws xob yog muab, cov electrons txav tom qab ib tug zoo xwb los yog lub qhov chaw ntawm ib tug uas ploj lawm electron vim hais tias ntshiab silicon thiab germanium yog cov neeg pluag conductors muaj ib tug network ntawm muaj zog covalent bonds. Qhov no ua rau cov khoom siv lead ua hluav taws xob. Nyob rau hauv extrinsic conduction, lub conductivity ntawm intrinsic conductors yog nce los ntawm qhov sib ntxiv ntawm ib tug tsim nyog tus nqi ntawm tsim impurity. Peb hu cov txheej txheem no "doping." Ob hom doping txoj kev yog electron-nplua nuj thiab electron-deficient doping.
Electron Rich Impurities yog dab tsi?
Electron-nplua nuj impurities yog hom atoms muaj ntau electrons uas muaj txiaj ntsig zoo hauv kev ua kom cov khoom siv hluav taws xob ntau ntxiv. Cov no yog lub npe hu ua n-hom semiconductors vim tias muaj pes tsawg tus electrons tau nce ntxiv thaum lub sijhawm siv cov txheej txheem doping.
Nyob rau hauv hom semiconductor no, atoms nrog tsib valence electrons tau ntxiv rau lub semiconductor, uas ua rau plaub tawm ntawm tsib electrons raug siv nyob rau hauv tsim ntawm plaub covalent bonds nrog plaub nyob sib ze silicon atoms. Tom qab ntawd lub thib tsib electron tshwm sim raws li ib tug ntxiv electron, thiab nws ua delocalized. Muaj ntau ntau delocalized electrons uas yuav ua rau kom cov conductivity ntawm doped silicon, yog li ua kom cov conductivity ntawm lub semiconductor.
Electron Deficient Impurities yog dab tsi?
Electron-nplua nuj impurities yog hom atoms muaj tsawg dua electrons, uas yog qhov tseem ceeb hauv kev ua kom cov khoom siv hluav taws xob ntau ntxiv. Cov no yog lub npe hu ua p-hom semiconductors vim tias muaj pes tsawg lub qhov tau nce thaum lub sij hawm doping txheej txheem.
Nyob rau hauv hom semiconductor no, ib lub atom nrog peb valence electrons ntxiv rau cov khoom siv semiconductor, hloov cov silicon lossis germanium atoms nrog impurity atom. impurity atoms muaj valence electrons uas tuaj yeem ua cov ntawv cog lus nrog peb lwm cov atoms, tab sis tom qab ntawd lub atom thib plaub tseem nyob dawb hauv cov siv lead ua silicon lossis germanium. Yog li ntawd, lub atom no tam sim no muaj rau kev siv hluav taws xob.
Qhov txawv ntawm Electron Rich thiab Electron Deficient Impurities yog dab tsi?
Qhov sib txawv tseem ceeb ntawm electron nplua nuj thiab electron tsis muaj impurities yog tias electron nplua nuj impurities yog doped nrog pawg 1s ntsiab xws li P thiab Raws li uas muaj 5 valence electrons, whereas electron deficient impurities yog doped nrog pawg 13 yam xws li B. thiab Al uas muaj 3 valence electrons. Thaum xav txog lub luag hauj lwm ntawm impurity atoms, nyob rau hauv electron nplua nuj impurities, 4 tawm ntawm 5 electrons nyob rau hauv lub impurity atom yog siv nyob rau hauv tsim covalent daim ntawv cog lus nrog 4 nyob sib ze silicon atoms, thiab lub 5th electron tseem. ntxiv thiab ua delocalized; Txawm li cas los xij, hauv electron deficient impurities, 4th electron ntawm lub lattice atom tseem tshuav ntxiv thiab cais, uas tuaj yeem tsim lub qhov hluav taws xob lossis hluav taws xob.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm electron nplua nuj thiab electron tsis muaj impurities.
Summary – Electron Rich vs Electron Deficient Impurities
Semiconductors yog cov khoom uas muaj cov khoom nruab nrab ntawm cov hlau thiab cov insulators. Cov khib nyiab no tsuas muaj qhov sib txawv me me ntawm lub zog ntawm cov valence band thiab khoob khoob khoob khoob. Electron nplua nuj impurities thiab electron tsis muaj impurities yog ob nqe lus uas peb siv los piav txog cov khoom siv semiconductor. Qhov sib txawv tseem ceeb ntawm electron nplua nuj thiab electron tsis muaj impurities yog tias electron nplua nuj impurities yog doped nrog pawg 1s ntsiab xws li P thiab Raws li uas muaj 5 valence electrons, whereas electron-deficient impurities yog doped nrog pawg 13 ntsiab xws li B thiab Al uas muaj. 3 valence electrons.
