Nzira itsva yekubatanidza zvikamu zvemasemiconductors matete sema nanometers mashoma haina kungoburitsa kuwanikwa kwesainzi chete asiwo mhando itsva yetransistor yemidziyo yemagetsi ine simba guru. Mhedzisiro yacho, yakaburitswa muApplied Physics Letters, yakamutsa kufarira kukuru.
Kubudirira uku kwakakonzerwa nekushanda pamwe chete kwevasayendisiti vepaLinköping University neSweGaN, kambani yakabatana neLiU, kambani inotsvaga zvinhu zvitsva. Kambani iyi inogadzira zvinhu zvemagetsi zvakagadzirwa negallium nitride.
Gallium nitride, GaN, imhando ye semiconductor inoshandiswa pakugadzira ma diode anoshanda zvakanaka emagetsi. Zvisinei, inogonawo kubatsira mune mamwe mashandisirwo, akadai se transistors, sezvo ichigona kutsungirira tembiricha yakakwira uye simba remagetsi kupfuura mamwe ma semiconductor akawanda. Aya ndiwo maficha akakosha ezvikamu zvemagetsi zvemangwana, kunyanya kune izvo zvinoshandiswa mumotokari dzemagetsi.
Gallium nitride vapour inobvumirwa kuungana pawafer yesilicon carbide, zvichiita kuti pave nejira rakatetepa. Nzira iyo imwe crystalline stuff inorimwa pane substrate yeimwe inozivikanwa se "epitaxy." Nzira iyi inowanzoshandiswa muindasitiri yesemiconductor sezvo ichipa rusununguko rukuru mukusarudza chimiro chekristaro uye kuumbwa kwemakemikari efirimu renanometer rakagadzirwa.
Kusanganiswa kwe gallium nitride, GaN, uye silicon carbide, SiC (zvose zvinogona kumira nesimba remagetsi), kunoita kuti macircuit acho akwane kushandiswa uko kunodiwa simba guru.
Kukwana kwechinhu pakati pezvinhu zviviri zve crystalline, gallium nitride nesilicon carbide, zvisinei, hakuna kunaka. Maatomu acho anopedzisira asisawirirane, izvo zvinoita kuti transistor isashande zvakanaka. Izvi zvakagadziriswa nekutsvaga, uko kwakazoita kuti pave nemhinduro yekutengeserana, umo jira rakatetepa realuminium nitride rakaiswa pakati pezvikamu zviviri.
Mainjiniya eSweGaN vakaona netsaona kuti ma transistors avo aigona kushanda nesimba guru kupfuura zvavaitarisira, uye pakutanga havana kunzwisisa chikonzero. Mhinduro yacho inowanikwa padanho reatomu - munzvimbo mbiri dzepakati dzakakosha mukati mezvikamu.
Vaongorori vekuLiU neSweGaN, vachitungamirwa naLars Hultman naJun Lu veLiU, vanopa muApplied Physics Letters tsananguro yechiitiko ichi, uye vanotsanangura nzira yekugadzira ma transistors ane kugona kukuru kwekutsungirira voltage yakakwira.
Masayendisiti akawana nzira yekukura kwe epitaxial yaisazivikanwa yavakatumidza kuti "transmorphic epitaxial growth." Inokonzera kuti kusvutana pakati pezvikamu zvakasiyana-siyana kunyudzwe zvishoma nezvishoma mumaatomu maviri. Izvi zvinoreva kuti vanogona kukura zvikamu zviviri, gallium nitride nealuminium nitride, pasilicon carbide nenzira yekudzora padanho reatomu kuti zvikamu zvakabatana sei mune chimwe chinhu. Murabhoritari vakaratidza kuti chinhu ichi chinotsungirira voltages yakakwira, kusvika ku1800 V. Kana voltage yakadaro ikaiswa pane chimwe chinhu chakagadzirwa nesilicon, masparks aizotanga kubhururuka uye transistor yaizoparadzwa.
"Tinokorokotedza SweGaN sezvo vatanga kushambadzira chigadzirwa ichi. Izvi zvinoratidza kushanda pamwe chete kwakanaka uye kushandiswa kwemhedzisiro yekutsvagisa munharaunda. Nekuda kwehukama hwepedyo hwatinahwo nevamwe vedu vekare vari kushandira kambani iyi, kutsvagisa kwedu kwakakurumidza kuva nemigumisiro kunze kwenyika yedzidzo," anodaro Lars Hultman.
Zvinyorwa zvakapihwa neYunivhesiti yeLinköping. Zvakanyorwa pakutanga naMonica Westman Svenselius. Cherechedza: Zviri mukati zvinogona kugadziriswa zvichienderana nemaitiro uye urefu.
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Nguva yekutumira: Chivabvu-11-2020