Ib txoj kev tshiab kom haum ua ke cov khaubncaws sab nraud povtseg ntawm semiconductors nyias raws li ob peb nanometers tau ua rau tsis yog kev tshawb pom nkaus xwb tab sis kuj yog hom tshiab ntawm transistor rau cov khoom siv hluav taws xob muaj zog. Qhov tshwm sim, luam tawm hauv Applied Physics Letters, tau ua rau muaj kev txaus siab loj heev.
Qhov kev ua tiav yog tshwm sim los ntawm kev sib koom tes zoo ntawm cov kws tshawb fawb ntawm Linköping University thiab SweGaN, lub tuam txhab sib tw los ntawm cov ntaub ntawv tshawb fawb ntawm LiU. Lub tuam txhab tsim cov khoom siv hluav taws xob tsim los ntawm gallium nitride.
Gallium nitride, GaN, yog ib qho khoom siv hluav taws xob siv rau kev siv lub teeb pom kev zoo. Txawm li cas los xij, nws kuj tseem yuav pab tau rau lwm yam kev siv, xws li transistors, vim nws tuaj yeem tiv taus qhov kub thiab txias tam sim no ntau dua li ntau lwm cov khoom siv semiconductors. Cov no yog cov khoom tseem ceeb rau cov khoom siv hluav taws xob yav tom ntej, tsis yog tsawg kawg rau cov siv hauv tsheb fais fab.
Gallium nitride vapor yog tso cai rau condense mus rau lub wafer ntawm silicon carbide, tsim ib txheej nyias. Txoj kev uas ib qho khoom siv crystalline yog cog rau ntawm lub substrate ntawm lwm lub npe hu ua "epitaxy." Txoj kev no feem ntau siv nyob rau hauv kev lag luam semiconductor vim nws muab kev ywj pheej zoo hauv kev txiav txim siab ntawm cov qauv siv lead ua thiab cov tshuaj muaj pes tsawg leeg ntawm nanometer zaj duab xis tsim.
Kev sib xyaw ua ke ntawm gallium nitride, GaN, thiab silicon carbide, SiC (ob qho tib si tuaj yeem tiv taus hluav taws xob muaj zog), ua kom cov circuits tsim nyog rau cov ntawv thov uas xav tau lub zog siab.
Qhov haum ntawm qhov chaw nruab nrab ntawm ob cov ntaub ntawv crystalline, gallium nitride thiab silicon carbide, txawm li cas los xij, tsis zoo. Cov atoms xaus tsis sib haum nrog ib leeg, uas ua rau tsis ua haujlwm ntawm transistor. Qhov no tau hais los ntawm kev tshawb fawb, uas tom qab ntawd coj mus rau kev lag luam kev daws teeb meem, nyob rau hauv uas ib txheej txawm thinner ntawm aluminium nitride tau muab tso rau ntawm ob txheej.
Cov engineers ntawm SweGaN tau pom los ntawm lub caij nyoog tias lawv cov transistors tuaj yeem tiv nrog qhov muaj zog ntau dua li qhov lawv xav tau, thiab lawv tsis tuaj yeem nkag siab vim li cas. Cov lus teb tuaj yeem pom ntawm qib atomic - hauv ob peb qhov chaw nruab nrab tseem ceeb hauv cov khoom.
Cov kws tshawb fawb ntawm LiU thiab SweGaN, coj los ntawm LiU's Lars Hultman thiab Jun Lu, tam sim no nyob rau hauv Applied Physics Letters piav qhia txog qhov tshwm sim, thiab piav qhia txog ib txoj hauv kev los tsim cov transistors nrog lub peev xwm ntau dua los tiv thaiv cov hluav taws xob siab.
Cov kws tshawb fawb tau tshawb pom yav dhau los tsis paub txog kev loj hlob epitaxial uas lawv tau hu ua "transmorphic epitaxial kev loj hlob." Nws ua rau qhov sib txawv ntawm cov khaubncaws sab nraud povtseg yuav maj mam absorbed hla ob peb txheej ntawm atoms. Qhov no txhais tau hais tias lawv tuaj yeem loj hlob ob txheej, gallium nitride thiab aluminium nitride, ntawm silicon carbide raws li kev tswj hwm ntawm qib atomic li cas cov khaubncaws sab nraud povtseg cuam tshuam rau ib leeg hauv cov khoom. Nyob rau hauv lub chaw soj nstuam lawv tau pom tias cov khoom tiv taus high voltages, mus txog rau 1800 V. Yog hais tias xws li ib tug voltage tau muab tso rau ib tug classic silicon-raws li tivthaiv, sparks yuav pib ya thiab lub transistor yuav puas.
"Peb ua kev zoo siab rau SweGaN thaum lawv pib ua lag luam cov khoom tsim. Nws qhia txog kev sib koom tes zoo thiab kev siv cov txiaj ntsig tshawb fawb hauv zej zog. Vim tias peb muaj kev sib raug zoo nrog peb cov npoj yaig yav dhau los uas tam sim no ua haujlwm rau lub tuam txhab, peb cov kev tshawb fawb tau muaj kev cuam tshuam rau sab nraud ntawm lub ntiaj teb kev kawm, "hais tias Lars Hultman.
Cov ntaub ntawv muab los ntawm Linköping University. Thawj sau los ntawm Monica Westman Svenselius. Nco tseg: Cov ntsiab lus tuaj yeem hloov kho rau style thiab ntev.
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Post lub sij hawm: May-11-2020