Hauv kev tsim cov microchips, silicon wafer tau muab tso rau hauv ib lub da dej hydrofluoric acid kom tshem tawm cov txheej txheem oxide thiab npaj rau saum npoo rau cov txheej txheem tom ntej los yog qauv. Ib qho kab ntawm cov hlau tawg los ntawm lub tshuab cua sov rau hauv qhov chaw tshuaj lom neeg tuaj yeem koom ua ke rau hauv silicon lattice, hloov cov cwj pwm hluav taws xob thiab txo cov khoom tawm los. Lub immersion rhaub yuav tsum yog li ntawd ua hauj lwm raws li ib tug chemically inert qhov chaw ntawm tshav kub es ib tug contributor ntawm paug.
Hauv cov txheej txheem ntub dej semiconductor, kev sib raug zoo ntawm cov khoom siv purity thiab tshuaj tiv thaiv yog qhov tseem ceeb. Qhov no yog vim li cas PTFE immersion heaters tau dhau los ua tus qauv hauv cov khoom siv hydrofluoric acid.
Lub luag haujlwm ntawm Hydrofluoric Acid hauv Silicon Wafer Processing
Hydrofluoric acid (HF) yog siv dav hauv kev tsim khoom semiconductor vim nws lub peev xwm tshwj xeeb los yaj silicon dioxide thaum tawm hauv cov txheej txheem silicon kuj tsis cuam tshuam rau hauv kev tswj xyuas.
HF etch da dej feem ntau yog siv rau:
Native oxide tshem tawm
Ua ntej- ntxuav ua ntej nyias - zaj duab xis deposition
Deg txias ua ntej diffusion txheej txheem
Kev kho mob oxidation
MEMS fabrication cov kauj ruam
Wafer rov ua haujlwm
Hom hydrofluoric acid ntau npaum li cas ntawm 1% mus rau 49%, nyob ntawm qhov etch profile thiab txheej txheem chemistry. Kev khiav hauj lwm kub yog feem ntau tswj los ntawm chav tsev kub txog li 50℃kom ruaj khov etch tus nqi thiab tswj cov tshuaj tiv thaiv kinetics.
Txawm hais tias qhov ntsuas kub ua haujlwm yog qhov nruab nrab, cov tshuaj aggressiveness ntawm HF yog qhov phem heev. Hydrofluoric acid tawm tsam iav, yaj ntau cov hlau oxides, thiab leaches ions los ntawm cov hlau alloys feem ntau.
Nyob rau hauv cov xwm txheej no, cov pa hluav taws xob tso cua sov ua tsis tau rau siab -purity semiconductor applications.
Vim li cas PTFE siv hauv HF Ech Baths
PTFE yog ib qho ntawm ob peb yam khoom siv engineering uas nthuav tawm ua tiav kev tiv thaiv rau hydrofluoric acid thoob plaws txhua qhov tseem ceeb thiab kev ua haujlwm kub tau ntsib hauv kev ua wafer.
Lub fluorinated molecular qauv ntawm PTFE tsim tshwj xeeb tshuaj inertness. Vim tias cov pa roj carbon-fluorine daim ntawv cog lus ruaj khov heev, hydrofluoric acid tsis tuaj yeem muaj txiaj ntsig los tawm tsam lossis degrade lub polymer nto nyob rau hauv cov txheej txheem ib txwm muaj.
Qhov tshuaj tiv thaiv kab mob no ua rau covPTFE rhaub hydrofluoric acid silicon wafer etchingkev sib xyaw ua ke tseem ceeb tshwj xeeb hauv kev tsim khoom semiconductor.
Hlau -Tshav Kub Dawb rau Ultra-High Purity
Nyob rau hauv ib lub wafer fab, lub rhaub yuav tsum yog ib lub thawv tsis pom ntawm cov cua sov, tsis yog qhov chaw ntawm cov kab mob. Txawm tias qhov ntau npaum li cas ntawm cov nickel yaj, chromium, hlau, lossis tooj liab tuaj yeem ua rau cov cuab yeej ua tau zoo ntawm nanometer - nplai geometries.
Lub PTFE immersion rhaub tshem tawm qhov kev pheej hmoo no vim tias cov ntaub ntub dej ntub dej tsis muaj cov khoom siv hlau raug. Cov txheej txheem kev daws teeb meem tsuas yog fluoropolymer barrier, tiv thaiv cov hlau ion tso rau hauv da dej.
Cov yam ntxwv no muab ntau yam zoo:
Txo ionic paug
Txhim kho wafer nto purity
Lower defect ceev
Zoo dua txheej txheem repeatability
Nce semiconductor tawm los sib xws
Raws li kev sib xyaw ua ke txuas ntxiv mus rau cov geometries me dua thiab nruj dua, cov kev cai tswj kev sib kis tau dhau los ua qhov xav tau ntau dua. Kev coj tus cwj pwm tsis zoo ntawm PTFE yog li txhawb nqa cov txheej txheem kev ruaj ntseg thiab kev ntseeg tau ntawm cov cuab yeej.
Kub muaj peev xwm thiab txheej txheem ruaj khov
Txawm hais tias hydrofluoric acid da dej feem ntau ua haujlwm qis dua 50 degree, cov khoom siv cua sov yuav tsum ua kom siab dua qhov kub ntawm lub hauv caug thaum lub sijhawm ua haujlwm tas mus li.
PTFE raug ntsuas rau kev pabcuam txuas ntxiv mus txog kwv yees li 110 degree, muab cov txiaj ntsig zoo thermal kev nyab xeeb tshaj tus qauv HF da dej kub.
Cov npoo no pab tswj kom ntev -cov ntaub ntawv kev ncaj ncees thaum txhawb kev ruaj ntseg thermal tswj nyob rau hauv tsis tu ncua kev khiav hauj lwm ntub lub rooj ntev zaum thiab recirculation systems.
Cov yam ntxwv ntawm kev hloov pauv kub ruaj khov
PTFE immersion heaters feem ntau yog tsim los nrog conservative nto watt ntom kom txo qis sheath overheating thiab khaws cia fluoropolymer life expectancy.
Cov yam ntxwv uas tsis yog -stick ntawm PTFE kuj tseem ua rau kev ua haujlwm ruaj khov. Silica residues los yog txheej txheem byproducts uas yuav precipitate thaum lub sij hawm etching cycles muaj teeb meem adhering rau lub fluoropolymer nto.
Raws li qhov tshwm sim:
Thaum tshav kub kub hloov efficiency tseem ruaj khov dua lub sij hawm
Kev ntxuav zaus yuav raug txo
Cov chaw kub hauv cheeb tsam raug txo kom tsawg
Cua sov lifespan yog txhim kho
Cov khoom no muaj txiaj ntsig tshwj xeeb hauv cov khoom siv hluav taws xob semiconductor fabrication uas cov txheej txheem sib xws yog qhov tseem ceeb.
Tsim Kev xav rau HF Cua sov Systems
Ntau yam kev tsim vaj tsev ib txwm raug txiav txim siab thaum qhia txog cov khoom siv hluav taws xob rau cov tshuab hydrofluoric acid.
Kev tsim kho kom zoo nkauj Encapsulated
Cov cua kub feem ntau yog tag nrho encapsulated nyob rau hauv PTFE tubing los yog molded fluoropolymer sib dhos kom cais tag nrho cov conductive Cheebtsam los ntawm cov txheej txheem kua.
Tsawg Watt Density Design
Lower surface watt densities reduce sheath temperature and minimize long-term thermal stress on the fluoropolymer material.
Cleanroom Compatibility
PTFE lub tshuab cua sov feem ntau tau muab tso rau hauv chav huv huv- siv tau rau kev rov ua dua thiab pom cov tshuab tsim rau ultra- siab- purity tshuaj tuav.
Compact Geometry
Wafer ua cov tso tsheb hlau luam feem ntau xav tau cov khoom siv hluav taws xob sib xyaw ua ke uas haum rau hauv cov khoom siv tshuaj lom neeg nqaim thaum tuav cov khoom siv thermal faib.
Qhov tshwm sim ntawm qhov system architecture txhawb ob qho tib si kev tswj qhov kub thiab txias thiab cov qauv tswj kev sib kis nruj heev.
Ceeb toom kev nyab xeeb
Hydrofluoric acid yog ib qho ntawm cov tshuaj phem tshaj plaws uas siv hauv kev lag luam. Kev kub nyhiab heev, kev mob toxicity, thiab ncua cov ntaub so ntswg puas tuaj yeem tshwm sim txawm tias me me.
Vim li no, HF cua sov tshuab feem ntau yog tsim los nrog ntau txheej tiv thaiv, suav nrog:
Secondary containers structures
Kev saib xyuas tsis tu ncua
Tshuaj- tiv taus cua tshuab
Tsis siv neeg kaw tswj
Kev tshuaj xyuas tsis tu ncua thiab xau -cov txheej txheem kuaj xyuas
nruj tiv thaiv cov sij hawm saib xyuas
Cov ntaub ntawv sib raug zoo thoob plaws hauv tag nrho cov kab ke yog qhov tseem ceeb vim hais tias txawm tias me me degradation tuaj yeem tsim kev nyab xeeb loj thiab muaj kev phom sij.
Qhov tseem ceeb ntawm Kev Tiv Thaiv Kab Mob hauv Wafer Fabrication
Niaj hnub nimno semiconductor manufacturing ua hauj lwm nyob rau hauv atomic thiab molecular precision theem. Cov kab mob microscopic tau qhia thaum lub sijhawm ua haujlwm ntub dej tuaj yeem cuam tshuam rau kev ncaj ncees ntawm dielectric, tus cwj pwm transistor, lossis nyias - zaj duab xis adhesion.
Lub purity yuav tsum tau ntawm advanced wafer fabrication yog li ntawd ntev tshaj li cov tshuaj lawv tus kheej mus rau txhua txhua wetted nto nyob rau hauv cov txheej txheem khoom.
CovPTFE rhaub hydrofluoric acid silicon wafer etchingdaim ntawv thov qhia tias cov ntaub ntawv tshawb fawb ncaj qha cuam tshuam rau cov khoom siv hluav taws xob thiab kev ntseeg tau li cas.
Los ntawm cov chemically inert nyob rau hauv ib qho ntawm cov kev lag luam cov txheej txheem nruj tshaj plaws chemistry, PTFE cov cua sov pab khaws cia cov xwm txheej ntawm silicon nto thoob plaws hauv kev ua haujlwm tseem ceeb.
Xaus
PTFE immersion rhaub tau dhau los ua tus qauv kub rau hydrofluoric acid etch da dej siv hauv semiconductor wafer ua. Lawv ua tiav kev tiv thaiv HF, hlau-dawb wetted nto, tsis yog - cov yam ntxwv ntawm cov nplaum, thiab cov thermal ua haujlwm ruaj khov ua rau lawv tshwj xeeb haum rau ultra- siab- purity chemical ib puag ncig.
Nyob rau hauv silicon wafer fabrication, kev tiv thaiv kab mob yog inseparable los ntawm txoj kev vam meej. PTFE heaters txhawb lub hom phiaj los ntawm kev saib xyuas lub atomic purity ntawm wafer nto thaum xa cov thermal tswj kev ruaj ntseg nyob rau hauv cov mob corrosive heev.
Daim ntawv thov thaum kawg qhia txog lub hauv paus ntsiab lus ntawm kev tsim vaj tsev: cov thev naus laus zis ntawm kev tsim khoom zoo tshaj plaws feem ntau nyob ntawm cov khoom siv yooj yim tshaj plaws ua tau - xaiv cov khoom uas tsis kam ua.
