Qhov sib txawv ntawm polysilicon thiab monocrystalline silicon

Cov khoom siv silicon yog cov khoom siv yooj yim tshaj plaws thiab tseem ceeb tshaj plaws hauv kev lag luam semiconductor. Cov txheej txheem tsim khoom nyuaj ntawm cov saw hlau kev lag luam semiconductor kuj yuav tsum pib los ntawm kev tsim cov khoom siv silicon yooj yim.

Monocrystalline silicon hnub ci vaj teeb

Monocrystalline silicon yog ib hom ntawm cov elemental silicon. Thaum cov elemental silicon khov, cov silicon atoms raug teeb tsa hauv cov pob zeb diamond lattice ua ntau lub nuclei siv lead ua ke. Yog tias cov crystal nuclei no loj hlob mus ua cov noob nrog tib qho kev taw qhia ntawm lub dav hlau siv lead ua ke, cov noob no yuav raug sib xyaw ua ke kom crystallize mus ua monocrystalline silicon.

Monocrystalline silicon muaj cov khoom siv lub cev zoo li cov hlau quasi thiab muaj hluav taws xob tsis muaj zog, uas nce nrog qhov kub nce. Tib lub sijhawm, monocrystalline silicon kuj muaj hluav taws xob semi-conductivity tseem ceeb. Ultra-pure monocrystalline silicon yog ib qho semiconductor intrinsic. Lub conductivity ntawm ultra-pure monocrystalline silicon tuaj yeem txhim kho los ntawm kev ntxiv cov ntsiab lus trace ⅢA (xws li boron), thiab P-hom silicon semiconductor tuaj yeem tsim. Xws li kev ntxiv cov ntsiab lus trace ⅤA (xws li phosphorus lossis arsenic) kuj tuaj yeem txhim kho qib ntawm conductivity, tsim N-hom silicon semiconductor.

polysiliconlub teeb hnub ci

Polysilicon yog ib hom ntawm cov silicon elemental. Thaum cov silicon elemental molten khov kho nyob rau hauv qhov xwm txheej ntawm supercooling, silicon atoms raug teeb tsa rau hauv ntau lub nuclei siv lead ua ke hauv daim ntawv ntawm pob zeb diamond lattice. Yog tias cov nuclei siv lead ua ke no loj hlob mus rau hauv cov noob nrog cov kev taw qhia siv lead sib txawv, cov noob no sib xyaw ua ke thiab crystallize rau hauv polysilicon. Nws txawv ntawm monocrystalline silicon, uas yog siv rau hauv cov khoom siv hluav taws xob thiab lub hnub ci hlwb, thiab los ntawm amorphous silicon, uas yog siv rau hauv cov khoom siv nyias-zaj duab xis thiablub hnub ci vaj teeb

Qhov sib txawv thiab kev sib txuas ntawm ob qho tib si

Hauv monocrystalline silicon, cov qauv siv lead ua ke yog sib xws thiab tuaj yeem txheeb xyuas los ntawm cov tsos sab nraud sib xws. Hauv monocrystalline silicon, lub lattice siv lead ua ke ntawm tag nrho cov qauv yog txuas ntxiv mus thiab tsis muaj ciam teb noob. Cov siv lead ua ke loj yog qhov tsis tshua muaj nyob rau hauv qhov xwm txheej thiab nyuaj rau ua hauv chav kuaj (saib recrystallization). Qhov sib txawv, qhov chaw ntawm cov atoms hauv cov qauv amorphous yog txwv rau kev txiav txim luv luv.

Cov theem polycrystalline thiab subcrystalline muaj ntau cov siv lead ua me me lossis microcrystals. Polysilicon yog ib yam khoom siv uas ua los ntawm ntau cov siv lead ua silicon me me. Cov hlwb polycrystalline tuaj yeem paub txog cov qauv los ntawm cov hlau pom. Cov qib semiconductor suav nrog lub hnub ci qib polysilicon raug hloov mus rau monocrystalline silicon, txhais tau tias cov siv lead ua sib txuas hauv polysilicon raug hloov mus rau hauv ib lub siv lead ua loj. Monocrystalline silicon yog siv los ua feem ntau cov khoom siv microelectronic raws li silicon. Polysilicon tuaj yeem ua tiav 99.9999% kev ntshiab. Ultra-pure polysilicon kuj tseem siv rau hauv kev lag luam semiconductor, xws li 2 - txog 3-meter ntev polysilicon rods. Hauv kev lag luam microelectronics, polysilicon muaj daim ntawv thov ntawm ob qho tib si macro thiab micro nplai. Cov txheej txheem tsim khoom ntawm monocrystalline silicon suav nrog Czeckorasky txheej txheem, thaj chaw yaj thiab Bridgman txheej txheem.

Qhov sib txawv ntawm polysilicon thiab monocrystalline silicon feem ntau yog pom tseeb hauv cov khoom siv lub cev. Hauv cov nqe lus ntawm cov khoom siv kho tshuab thiab hluav taws xob, polysilicon qis dua monocrystalline silicon. Polysilicon tuaj yeem siv ua cov khoom siv raw rau kev kos duab monocrystalline silicon.

1. Hais txog anisotropy ntawm cov khoom siv kho tshuab, cov khoom siv kho qhov muag thiab cov khoom siv thermal, nws tsis pom tseeb dua li monocrystalline silicon

2. Hais txog cov khoom siv hluav taws xob, qhov hluav taws xob conductivity ntawm polycrystalline silicon tsis tseem ceeb npaum li ntawm monocrystalline silicon, lossis txawm tias yuav luag tsis muaj hluav taws xob conductivity

3, hais txog kev ua haujlwm tshuaj lom neeg, qhov sib txawv ntawm ob yog me me heev, feem ntau siv polysilicon ntau dua