Raws li cov lus ceeb toom, pawg neeg tshawb fawb ntawm Wuhan University tsis ntev los no tau tshaj tawm txog kev siv PSSA (qauv sapphire nrog silica array) txheej txheem qis kom txo tau cov teeb meem ntawm gallium nitride hlws ciam av tsis sib xws. Nws tau thov tias PSSA substrate tuaj yeem txhim kho indium gallium nitride thiab gallium nitride (InGaN / GaN) flip-chip pom lub teeb pom kev zoo LED ntau.
PSSA yog qauv txheej txheem sapphire txheej nrog silicon dioxide array. Nyuam qhuav pib lub xyoo no, xibfwb Zhou Shengjun, tus thawj coj ntawm pawg kws tshawb fawb, tau thov tias PSSA substrate tuaj yeem txhim kho kom muaj txiaj ntsig ntawm indium gallium nitride thiab aluminium gallium nitride (InGaN / AlGaN) UV LEDs.
Txoj kev tshawb no piav qhia txog lub peev xwm zoo ntawm PSSA substrates hauv kev txhim kho kev ua tau zoo ntawm Group III gallium nitride LEDs. Piv nrog rau cov ncab raug cai, ntxeev chip LED tuaj yeem daws cov teeb meem ntawm cov cua sov tawm thiab tsis txaus ntseeg ntawm kev faib tawm tam sim no. Hauv cov qauv ntxeev hauv lub teeb, lub teeb ci tsuas yog tsim tawm los ntawm cov pob tshab pob tshab dawb.
Professor Zhou tau taw qhia tias kev siv cov txheej txheem sapphire substrate (PSS) kom loj tuaj ntawm gallium nitride, vim tias gallium nitride yog ua rau ntawm cov ntug txheej txheem, yuav muaj qhov teeb meem, thiab txo cov xov ntawm qhov tsis haum ntawm gallium nitride films tau ib txwm muaj kev sib tw loj. , uas lom zem ntau txwv qhov kev txhim kho ntxiv ntawm kev ua kom zoo dua qub ntawm quantum efficiency.
Nyob rau tib lub sijhawm, nws yog qhov nyuaj kom ua tiav kev sib txig sib luag hauv lub teeb hluav taws xob ua kom zoo rau flip-chip LEDs ntawm PSS substrates, vim tias qhov loj refractive index nyob ntawm qhov sib cuam tshuam ntawm sapphire thiab huab cua yog qhov kev txiav txim siab.
Hauv kev sib piv rau PSSA substrate, txij li sab ntug dej ntawm cov roj silicon dioxide array cones tsis tsim gallium nitride Islands tuaj, LED loj hlob ntawm PSSA substrate tuaj yeem txo qis kev sib tiv tauj ntawm thaj chaw sidewall thiab gallium nitride ntawm thaj chaw C-dav hlau ntawm lub substrate. Qhov teeb meem tsis zoo uas tshwm sim nyob rau ntawm ob qho chaw ntawm ob leeg.
Professor Zhou tau hais tias piv rau cov txheej txheem ib txwm muaj PSS substrate solution, cov roj silicon array hauv flip-chip LED ntawm PSSA substrate muaj qhov ntsuas me me ntawm qhov sib txawv ntawm qhov sib txawv ntawm silicon array thiab huab cua, yog li ntau lub teeb yog refracted los ntawm silicon array mus rau huab cua. Txhawm rau txhawm rau txhim kho lub teeb extraction efficiency.
Ib qho ntxiv, raws li kev txhim kho ntawm cov siv lead ua zoo thiab lub teeb pom kev zoo, sab nraud quantum efficiency ntawm flip-chip LED ntawm PSSA substrate kuj tseem siab dua qhov ntawm flip-chip LED ntawm PSS substrate.
Ob txoj kev tshawb fawb los ntawm Wuhan University tau qhia tias PSSA substrates tuaj yeem ua qhov zoo dua ntawm qhov cuam tshuam thiab cuam tshuam zoo dua li PSS substrates. Kev siv PSSA substrate txo cov xov kab tsis ua haujlwm thiab kom lub teeb txuag hluav taws xob ntau dua, thiaj li txhim kho qhov ua kom zoo ntawm InGaN / AlGaN UV LED thiab InGaN / GaN flip chip LEDs.
