Njira yatsopano yolumikizira pamodzi zigawo za semiconductors zoonda ngati ma nanometers ochepa sizinangowonjezera kutulukira kwa sayansi komanso mtundu watsopano wa transistor wa zipangizo zamagetsi zamagetsi. Zotsatira zake, zofalitsidwa mu Applied Physics Letters, zadzutsa chidwi chachikulu.
Kupambanaku kudachitika chifukwa cha mgwirizano wapakati pakati pa asayansi a ku Linköping University ndi SweGaN, kampani yomwe imachokera ku kafukufuku wa sayansi ku LiU. Kampaniyo imapanga zida zamagetsi zamagetsi kuchokera ku gallium nitride.
Gallium nitride, GaN, ndi semiconductor yomwe imagwiritsidwa ntchito popanga ma diode otulutsa bwino. Itha kukhalanso yothandiza pamapulogalamu ena, monga ma transistors, chifukwa imatha kupirira kutentha kwambiri komanso mphamvu zapano kuposa ma semiconductors ena ambiri. Izi ndizofunika kwambiri pazinthu zamagetsi zam'tsogolo, osati zomwe zimagwiritsidwa ntchito pamagetsi amagetsi.
Mpweya wa Gallium nitride umaloledwa kukhazikika pamtengo wophikira wa silicon carbide, kupanga zokutira zopyapyala. Njira yomwe kristalo umodzi umamera pa gawo lapansi la wina imadziwika kuti "epitaxy." Njirayi imagwiritsidwa ntchito nthawi zambiri m'makampani opanga ma semiconductor popeza imapereka ufulu waukulu pakuzindikira mawonekedwe a kristalo komanso kapangidwe kake ka filimu ya nanometer.
Kuphatikiza kwa gallium nitride, GaN, ndi silicon carbide, SiC (zonse zomwe zimatha kupirira minda yamagetsi yamphamvu), zimatsimikizira kuti mabwalowa ndi oyenera kugwiritsa ntchito momwe mphamvu zazikulu zimafunikira.
Kukwanira pamtunda pakati pa zida ziwiri za crystalline, gallium nitride ndi silicon carbide, komabe, ndizosauka. Ma atomu amatha kukhala osagwirizana wina ndi mnzake, zomwe zimatsogolera ku kulephera kwa transistor. Izi zayankhidwa ndi kafukufuku, zomwe pambuyo pake zinayambitsa njira yothetsera malonda, momwe gawo lochepa kwambiri la aluminium nitride linayikidwa pakati pa zigawo ziwirizo.
Akatswiri a ku SweGaN adazindikira mwangozi kuti ma transistors awo amatha kuthana ndi mphamvu zakumunda kuposa momwe amayembekezera, ndipo poyamba sanathe kumvetsetsa chifukwa chake. Yankho likhoza kupezeka pamlingo wa atomiki - m'malo angapo ofunikira apakati mkati mwa zigawozo.
Ofufuza a ku LiU ndi SweGaN, motsogozedwa ndi a Lars Hultman ndi Jun Lu a LiU, omwe ali mu Applied Physics Letters kufotokozera za chochitikachi, ndikufotokozera njira yopangira ma transistors omwe ali ndi luso lopambana kwambiri lotha kupirira ma voltages apamwamba.
Asayansi apeza njira yakukula kwa epitaxial yomwe kale idadziwika kuti "transmorphic epitaxial growth." Zimapangitsa kuti kupsyinjika pakati pa zigawo zosiyanasiyana kulowetsedwe pang'onopang'ono kudutsa zigawo zingapo za maatomu. Izi zikutanthauza kuti amatha kukulitsa zigawo ziwiri, gallium nitride ndi aluminium nitride, pa silicon carbide m'njira kuti athe kuwongolera pamlingo wa atomiki momwe zigawozo zimagwirizanirana wina ndi mnzake muzinthuzo. Mu labotale awonetsa kuti zinthuzo zimalimbana ndi ma voltages apamwamba, mpaka 1800 V. Ngati magetsi oterowo atayikidwa pagawo lakale la silicon-based, zipsera zimayamba kuwuluka ndipo transistor idzawonongedwa.
"Tikuthokoza SweGaN pomwe ayamba kugulitsa zomwe zidapangidwa. Zikuwonetsa mgwirizano wothandiza komanso kugwiritsa ntchito zotsatira za kafukufuku pagulu. Chifukwa cholumikizana kwambiri ndi anzathu am'mbuyomu omwe tsopano akugwira ntchito kukampaniyi, kafukufuku wathu wakhudzanso kwambiri maphunziro, "akutero Lars Hultman.
Zida zoperekedwa ndi Yunivesite ya Linköping. Choyambirira cholembedwa ndi Monica Westman Svenselius. Zindikirani: Zomwe zili mkati zitha kusinthidwa malinga ndi kalembedwe ndi kutalika.
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Nthawi yotumiza: May-11-2020