Txoj kev tshiab muab cov transistors muaj zog: Kev loj hlob ntawm Transmorphic epitaxial ntawm AlN nucleation txheej ntawm SiC substrates rau cov transistors GaN nyias nyias - ScienceDaily

Ib txoj kev tshiab los sib dhos ua ke cov txheej semiconductors uas nyias li ob peb nanometers tau ua rau tsis yog tsuas yog kev tshawb pom xwb tab sis kuj yog ib hom transistor tshiab rau cov khoom siv hluav taws xob muaj zog heev. Qhov tshwm sim, luam tawm hauv Applied Physics Letters, tau ua rau muaj kev txaus siab heev.

Qhov kev ua tiav no yog qhov tshwm sim ntawm kev koom tes ze ntawm cov kws tshawb fawb ntawm Linköping University thiab SweGaN, ib lub tuam txhab spin-off los ntawm kev tshawb fawb txog cov ntaub ntawv ntawm LiU. Lub tuam txhab tsim cov khoom siv hluav taws xob uas ua los ntawm gallium nitride.

Gallium nitride, GaN, yog ib qho semiconductor siv rau cov diodes uas ua haujlwm tau 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 siab dua thiab lub zog tam sim no ntau dua li ntau lwm cov semiconductors. Cov no yog cov khoom tseem ceeb rau cov khoom siv hluav taws xob yav tom ntej, tsis yog rau cov uas siv hauv tsheb fais fab.

Cov pa roj gallium nitride raug tso cai kom sib sau ua ke rau ntawm lub wafer ntawm silicon carbide, tsim ib txheej nyias nyias. Txoj kev uas ib yam khoom siv crystalline raug loj hlob ntawm ib qho substrate ntawm lwm qhov hu ua "epitaxy." Txoj kev no feem ntau siv hauv kev lag luam semiconductor vim nws muab kev ywj pheej zoo hauv kev txiav txim siab ob qho tib si cov qauv siv lead ua thiab cov tshuaj lom neeg ntawm cov zaj duab xis nanometre tsim.

Kev sib xyaw ua ke ntawm gallium nitride, GaN, thiab silicon carbide, SiC (ob qho tib si tuaj yeem tiv taus cov teb hluav taws xob muaj zog), ua kom ntseeg tau tias cov circuits tsim nyog rau cov ntawv thov uas xav tau lub zog siab.

Txawm li cas los xij, qhov sib haum ntawm qhov chaw ntawm ob lub khoom siv crystalline, gallium nitride thiab silicon carbide, tsis zoo. Cov atoms xaus rau qhov tsis sib xws nrog ib leeg, uas ua rau lub transistor tsis ua haujlwm. Qhov no tau raug daws los ntawm kev tshawb fawb, uas tom qab ntawd ua rau muaj kev daws teeb meem lag luam, uas ib txheej nyias dua ntawm aluminium nitride tau muab tso rau ntawm ob txheej.

Cov engineers ntawm SweGaN tau pom los ntawm txoj hmoo tias lawv cov transistors tuaj yeem tiv taus cov zog teb siab dua li lawv xav tau, thiab lawv tsis tuaj yeem nkag siab tias yog 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, nthuav qhia hauv Applied Physics Letters ib qho kev piav qhia txog qhov xwm txheej, thiab piav qhia txog ib txoj hauv kev los tsim cov transistors nrog lub peev xwm zoo dua los tiv taus cov hluav taws xob siab.

Cov kws tshawb fawb tau tshawb pom ib txoj kev loj hlob epitaxial uas lawv tsis tau paub ua ntej uas lawv tau hu ua "transmorphic epitaxial growth." Nws ua rau qhov kev ntxhov siab ntawm cov khaubncaws sab nraud povtseg sib txawv maj mam nqus mus rau ob peb txheej ntawm cov atoms. Qhov no txhais tau tias lawv tuaj yeem loj hlob ob txheej, gallium nitride thiab aluminium nitride, ntawm silicon carbide kom tswj tau ntawm qib atomic li cas cov khaubncaws sab nraud povtseg sib raug zoo rau ib leeg hauv cov khoom siv. Hauv chav kuaj lawv tau qhia tias cov khoom siv tiv taus cov hluav taws xob siab, txog li 1800 V. Yog tias qhov hluav taws xob zoo li no tau muab tso rau ntawm cov khoom siv silicon, cov hluav taws xob yuav pib ya thiab lub transistor yuav raug rhuav tshem.

"Peb zoo siab rau SweGaN thaum lawv pib ua lag luam qhov kev tsim kho tshiab. Nws qhia txog kev koom tes zoo thiab kev siv cov txiaj ntsig tshawb fawb hauv zej zog. Vim yog qhov kev sib cuag ze uas peb muaj nrog peb cov npoj yaig yav dhau los uas tam sim no ua haujlwm rau lub tuam txhab, peb txoj kev tshawb fawb sai sai muaj kev cuam tshuam sab nraud ntawm lub ntiaj teb kev kawm, "Lars Hultman hais.

Cov ntaub ntawv muab los ntawm Linköping University. Thawj sau los ntawm Monica Westman Svenselius. Lus Cim: Cov ntsiab lus yuav raug hloov kho rau cov qauv thiab qhov ntev.

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