University of Illinois ntawm cov neeg tshawb fawb Urbana-Champaign tau tsim ib txoj kev tshiab los txhim kho cov ntsuab LED ci thiab txhim kho nws txoj kev ua haujlwm.
Xib fwb Txais Bayram, tus pab cuam xib fwb ntawm hluav taws xob thiab computer engineering hauv University of Illinois, tau tsim ib txoj kev tshiab los txhim kho qhov ci thiab kev ua haujlwm ntawm ntsuab LEDs. (Tag Nrho Source: University of Illinois)
Kev siv cov txuj ci nruab nrab ntawm cov khoom siv hluav taws xob (semiconductor long crystal technology), cov neeg soj ntsuam cov ntaub ntawv tsim cov roj ntsha roj (GaN) ntawm silicon substrates uas tsim hluav taws xob loj rau cov teeb pom kev zoo-lub xeev.
"Qhov no yog qhov kev tshawb nrhiav cov neeg tshawb fawb ua tau los ua cov khoom tshiab raw ntawm cov txheej txheem kho kom raug CMOS silicon, uas yog cov roj carbon nitrate (cubic nitride)," said Can Bayram, tus pab xibfwb ntawm hluav taws xob thiab computer engineering hauv University of Illinois . ), Cov khoom siv no tsuas yog siv rau ntsuab wavelength emitter.
Kev siv cov semiconductors rau kev nkag siab thiab kev sib txuas lus los qhib kev pom kev sib txuas ntawm lub teeb sib txuas, thiab kev sib txuas lus kho qhov muag yog kev siv tshuab kom hloov tau lub teeb daim ntawv thov. LEDs uas txhawb CMOS kev ua tau zoo sai, txuag, qis zog, thiab daim ntawv thov ntsuab LEDs thaum xa cov nqi ntawm ntau cov txheej txheem.
Feem ntau GaN tsim ib lossis ob txoj siv lead ua, hexagonal lossis lub voos xwmfab. Hexagonal GaN yog thev ruaj khov thiab yog ib daim ntawv thov siv ua cov ntawv nrab semiconductor. Txawm li cas los xij, hexagonal GaN yog qhov tshwm sim rau qhov tshwm sim txawv zog, lub sab hauv hluav taws xob yuav tsis pom zoo electrons thiab positrons sib cais los tiv thaiv lawv ntawm tsevneeg, uas ua rau lub teeb tawm ntawm cov hluav taws xob.
Kom deb li deb, cov neeg tshawb xyuas tsuas siv tau cov roj ntsha molecular nyom epitaxy (Molecular beam epitaxy) los tsim cov xwm txheej GaN, cov txheej txheem no yog kim heev thiab piv nrog cov txheej txheem MOCVD yog siv sij hawm heev.
Cov kws tshawb fawb tau ua tiav hauv cov khoom ua tau los ntawm cov khoom siv raw khoom ntawm CMOS silicon, uas yog square gallium nitride, uas yog siv rau ntsuab wavelength emitter.
Bayram hais tias: "Lithography thiab isotropic etching cov tswv yim tsim U-uake grooves rau silicon Lub txheej txheem ntawm cov tsis muaj kev tiv thaiv tsis yog lub luag hauj lwm tseem ceeb hauv kev sib sau rau daim square. ua teeb meem ntawm overlapping, electrons thiab qhov muaj ntau nrawm dua thiab ua ntawm lub teeb.
Bayram thiab Liu ntseeg tias lawv cov xwmfab GaN muaj peev xwm ua tiav rau qhov uas cia LED kom ncav tus xoom poob (droop). Rau ntsuab, xiav, lossis UV LEDs, qhov kev ua haujlwm zoo ntawm cov LEDs no yuav maj mam poob nrog cov tswv yim ntawm qhov tam sim no, lub npe hu ua lub teeb tsis ua hauj lwm.
Txoj kev tshawb no qhia tias polarization plays lub luag hauj lwm tseem ceeb hauv qhov teeb meem ntawm lub teeb tsis ua hauj lwm, thawb cov electrons tawm ntawm grooves, tshwj xeeb tshaj yog nyob rau hauv cov voj uas tsis muaj tswv yim. Thaum xoom polarization, cov xwmfab LED tuaj yeem ua kom pom ib txheej dim-emitting txheej thiab daws qhov txo electron thiab groove sib tshooj thiab tam sim no muaj tshaj.
Zoo ntsuab LED yuav ntse qhib tshiab cov ntaub ntawv los ntawm cov qauv teeb pom kev zoo-lub xeev. Piv txwv li, cov LEDs yuav tawm tau lub teeb dawb los ntawm tov thiab ua kom muaj kev txuag hluav taws xob. Lwm cov ntawv tshaj tawm kuj muaj xws li siv cov non-fluorescent ntsuab LED manufacturing super-parallel LED daim ntaub ntawv, kev sib txuas lus dej thiab, piv txwv li, kev pom kev ua noob caj noob ces thiab migraine thiab lwm yam kev siv biotechnology.
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