Vim li cas Silicon Wafers yuav tsum tau ntxuav nrog Hydrofluoric Acid?

Silicon wafers feem ntau yog siv los ua cov khoom siv xws li kev sib xyaw ua ke thiab lub hnub ci hlwb. Thaum lub sij hawm tsim cov txheej txheem, cov organic teeb meem, hlau impurities, oxides thiab lwm yam khoom qias neeg tej zaum yuav muaj nyob rau saum npoo ntawm silicon wafer, uas yuav cuam tshuam qhov zoo thiab kev ua tau zoo ntawm silicon wafer nto. Hydrofluoric acid tu yog ib txoj hauv kev siv tu rau cov laj thawj hauv qab no:
1. Kev tshem tawm cov organic teeb meem: feem ntau muaj cov organic paug rau ntawm qhov chaw ntawm silicon wafers, xws li roj thiab lubricants. Cov organic tshuaj no yuav ua raws li qhov chaw ntawm silicon wafer thiab cuam tshuam rau cov txheej txheem tom ntej. Hydrofluoric acid muaj corrosiveness thiab solubility zoo heev thiab tuaj yeem tshem tawm cov pa phem ntawm cov khoom siv silicon wafers.
2. Tshem tawm cov hlau impurities: tej zaum yuav muaj hlau impurities nyob rau saum npoo ntawm silicon wafer, xws li hlau, tooj liab, thiab lwm yam. Cov hlau impurities no yuav ua rau cov khoom hluav taws xob ntawm silicon wafer nto degrade, yog li cuam tshuam rau kev ua haujlwm ntawm lub cuab yeej. . Hydrofluoric acid tuaj yeem ua rau cov hlau tsis huv thiab yaj lawv kom ua tiav lub hom phiaj ntawm kev tshem tawm impurities.
3. Tshem tawm cov oxides: tej zaum yuav muaj ib txheej ntawm oxides (xws li silicon dioxide) nyob rau saum npoo ntawm silicon wafer. Cov oxides no yuav tsis muaj zog purity thiab smoothness ntawm silicon wafer nto. Hydrofluoric acid tuaj yeem hnov ​​​​mob nrog oxides, yaj cov oxide txheej, thiab ua kom lub ntsej muag ntawm silicon wafer huv si thiab du.
4. Purify saum npoo ntawm silicon wafer: Hydrofluoric acid tuaj yeem yaj cov txheej nyias nyias ntawm silicon rau ntawm qhov chaw ntawm silicon wafer nyob rau hauv tej yam kev mob, yog li ua tiav cov nyhuv ntawm purifying nto. Qhov no yog vim hydrofluoric acid reacts nrog silicon los tsim hydrogen fluoride gas (HF). Cov pa roj hydrogen fluoride tuaj yeem ua rau muaj zog ntxiv nrog silicon los tsim cov pa roj silicon hexafluoride (SiF6), uas tau ploj nrog cov pa, ua rau lub ntsej muag ntawm silicon wafer ntxuav. .
Nyob rau hauv luv luv, hydrofluoric acid tu yog ib txoj kev tu zoo rau silicon wafers. Nws tuaj yeem tshem tawm cov organic teeb meem, hlau impurities thiab oxides, purify saum npoo ntawm silicon wafer, thiab txhim kho qhov zoo thiab kev ua tau zoo ntawm silicon wafer.