Kodi anChip cha LED? Ndiye makhalidwe ake ndi otani?Kupanga chip cha LEDmakamaka kupanga ogwira ndi odalirika otsika ohm kukhudzana elekitirodi, kukumana ndi yaing'ono voteji dontho pakati pa zinthu contactable, kupereka kuthamanga PAD kwa waya wowotcherera, ndipo nthawi yomweyo, kuwala kwambiri mmene ndingathere. Njira yosinthira filimu nthawi zambiri imagwiritsa ntchito njira ya vacuum evaporation. Pansi pa vacuum yayikulu ya 4Pa, zidazo zimasungunuka ndi kutentha kwamphamvu kapena kutentha kwa electron mtengo bombardment, ndipo BZX79C18 imasinthidwa kukhala nthunzi yachitsulo kuti isungidwe pamwamba pa zida za semiconductor pansi pamavuto otsika.

Zitsulo zamtundu wa P zomwe zimagwiritsidwa ntchito kwambiri ndi AuBe, AuZn ndi ma aloyi ena, ndipo zitsulo zolumikizana kumbali ya N nthawi zambiri zimakhala ma alloys a AuGeNi. The aloyi wosanjikiza anapanga pambuyo ❖ kuyanika ayeneranso kuvumbulutsa dera lowala mmene tingathere kudzera photolithography, kuti otsala wosanjikiza aloyi akhoza kukwaniritsa zofunika ndi odalirika otsika ohm kukhudzana elekitirodi ndi kuwotcherera mzere PAD. Pambuyo pa ndondomeko ya photolithography ikamalizidwa, ndondomeko yowonongeka idzachitidwa pansi pa chitetezo cha H2 kapena N2. Nthawi ndi kutentha kwa alloying nthawi zambiri zimatsimikiziridwa molingana ndi mawonekedwe a zida za semiconductor ndi mawonekedwe a ng'anjo ya alloy. Zoonadi, ngati njira ya chip electrode monga buluu-wobiriwira ndi yovuta kwambiri, kukula kwa filimuyi ndi plasma etching process iyenera kuwonjezeredwa.

Mukupanga chip cha LED, ndi njira ziti zomwe zimakhudza kwambiri magwiridwe ake azithunzi?

Nthawi zambiri, akamaliza kupanga LED epitaxial, ntchito yake yayikulu yamagetsi yatha. Kupanga tchipisi sikungasinthe chikhalidwe chake chopangira, koma zosayenera pakupaka ndi kuphatikizika kumapangitsa kuti magawo ena amagetsi akhale osauka. Mwachitsanzo, kutentha kwapansi kapena kutsika kwa alloying kumayambitsa kukhudzana koyipa kwa ohmic, chomwe ndi chifukwa chachikulu chakutsika kwa VF pakupanga chip. Pambuyo kudula, ngati njira ina etching ikuchitika pa chip m'mphepete, zingakhale zothandiza kusintha kutayikira kumbuyo kwa chip. Izi zili choncho chifukwa mutatha kudula ndi tsamba la diamondi, padzakhala ufa wambiri wotsalira pamphepete mwa chip. Ngati tinthu tating'ono ting'onoting'ono timamatira ku mphambano ya PN ya chip ya LED, izi zipangitsa kuti magetsi azituluka, kapena kusweka. Komanso, ngati photoresist pa Chip pamwamba si peeled bwinobwino, zingachititse mavuto kutsogolo waya kugwirizana ndi soldering zabodza. Ngati ili kumbuyo, imayambitsanso kutsika kwamphamvu. Popanga chip, kulimba kwa kuwala kumatha kupitilizidwa ndi kukhwimitsa pamwamba ndikudula mu mawonekedwe opindika a trapezoid.

Chifukwa chiyani tchipisi ta LED tagawika makulidwe osiyanasiyana? Kodi zotsatira za kukula ndi chiyaniChithunzi cha LEDntchito?

Kukula kwa chip cha LED kumatha kugawidwa kukhala chip chaching'ono champhamvu, chip chapakatikati ndi chip champhamvu kwambiri malinga ndi mphamvu. Malinga ndi zomwe makasitomala amafuna, zitha kugawidwa mulingo umodzi wa chubu, mulingo wa digito, mulingo wa lattice ndi kuyatsa kokongoletsa ndi magulu ena. Kukula kwenikweni kwa chip kumadalira pakupanga kwenikweni kwa opanga chip osiyanasiyana, ndipo palibe chofunikira chenicheni. Malingana ngati ndondomekoyo ili yoyenera, chip chikhoza kupititsa patsogolo kutulutsa kwa unit ndikuchepetsa mtengo, ndipo mawonekedwe a photoelectric sangasinthe kwenikweni. Zomwe zimagwiritsidwa ntchito ndi chip zimayenderana ndi kachulukidwe kameneka kakuyenda mu chip. Zomwe zimagwiritsidwa ntchito ndi chip ndizochepa ndipo zomwe zimagwiritsidwa ntchito ndi chip ndi zazikulu. Kachulukidwe kawo kagawo kawo ndi kofanana. Poganizira kuti kutentha kwa kutentha ndilo vuto lalikulu pansi pamakono apamwamba, kuwala kwake kowala kumakhala kochepa kusiyana ndi komwe kumakhala pansi pamakono. Kumbali inayi, pamene dera likuwonjezeka, kukana kwa chip kwa chip kudzachepa, kotero kuti magetsi oyendetsa kutsogolo adzachepa.

Kodi chip chamtundu wanji chomwe chip champhamvu cha LED chimatanthawuza? Chifukwa chiyani?

Tchipisi zamphamvu kwambiri za LED zomwe zimagwiritsidwa ntchito powunikira zoyera zimatha kuwoneka pamsika pafupifupi 40 mils, ndipo zomwe zimatchedwa tchipisi tamphamvu kwambiri nthawi zambiri zimatanthawuza kuti mphamvu yamagetsi ndi yopitilira 1W. Popeza kuti mphamvu ya quantum nthawi zambiri imakhala yosakwana 20%, mphamvu zambiri zamagetsi zimasinthidwa kukhala mphamvu ya kutentha, kotero kutentha kwa tchipisi tamphamvu kwambiri ndikofunikira kwambiri, komwe kumafunikira chip chachikulu.

Kodi ndi zofunikira ziti za chip process ndi zida zopangira popanga zida za GaN epitaxial poyerekeza ndi GaP, GaAs ndi InGaAlP? Chifukwa chiyani?

Magawo a tchipisi tating'ono ta LED ofiira ndi achikasu ndi tchipisi chowala cha quaternary chofiira ndi chachikasu amapangidwa ndi GaP, GaAs ndi zida zina za semiconductor, zomwe zimatha kupangidwa kukhala magawo amtundu wa N. Njira yonyowa imagwiritsidwa ntchito pojambula zithunzi, ndipo kenako tsamba la gudumu la diamondi limagwiritsidwa ntchito podula tchipisi. Chip chobiriwira chobiriwira cha zinthu za GaN ndi gawo lapansi la safiro. Chifukwa gawo lapansi la safiro ndi insulated, silingagwiritsidwe ntchito ngati mtengo wa LED. Ma elekitirodi a P/N ayenera kupangidwa pamtunda wa epitaxial nthawi imodzi kudzera munjira yowuma komanso kudzera munjira zina. Chifukwa chakuti safiro ndi olimba kwambiri, ndizovuta kudula tchipisi ndi magudumu a diamondi. Njira yake nthawi zambiri imakhala yovuta kuposa ya GaP ndi GaAs ma LED.

Kodi kapangidwe ndi mawonekedwe a "transparent electrode" chip ndi chiyani?

Chomwe chimatchedwa transparent electrode chiyenera kuyendetsa magetsi ndi kuwala. Nkhaniyi tsopano imagwiritsidwa ntchito kwambiri pakupanga makristasi amadzimadzi. Dzina lake ndi Indium Tin Oxide (ITO), koma silingagwiritsidwe ntchito ngati chowotcherera. Pakupanga, ohmic electrode iyenera kupangidwa pa chip pamwamba, ndiyeno wosanjikiza wa ITO adzakutidwa pamwamba, ndiyeno wosanjikiza wowotcherera pad adzakutidwa pamwamba pa ITO. Mwanjira iyi, zomwe zikuchitika kuchokera kutsogolo zimagawidwa mofanana kwa ohmic contact electrode kupyolera mu ITO wosanjikiza. Pa nthawi yomweyi, popeza ITO refractive index ili pakati pa mpweya ndi refractive index of epitaxial material, kuwala kowala kumatha kuwonjezeka, ndipo kuwala kowala kungathenso kuwonjezeka.

Kodi ukadaulo wa chip wowunikira semiconductor ndi chiyani?

Ndi chitukuko cha ukadaulo wa semiconductor LED, ntchito zake pakuwunikira zikuchulukirachulukira, makamaka kuwonekera kwa LED yoyera, yomwe yakhala cholinga cha kuyatsa kwa semiconductor. Komabe, ukadaulo wa chip ndi ma CD ofunikira uyenera kukonzedwanso, ndipo chip chiyenera kupangidwa kuti chikhale champhamvu kwambiri, kuwala kowala kwambiri komanso kutsika kwamafuta. Kuchulukitsa mphamvu kumatanthauza kukulitsa zomwe zimagwiritsidwa ntchito ndi chip. Njira yolunjika ndikuwonjezera kukula kwa chip. Masiku ano, tchipisi tamphamvu kwambiri zonse ndi 1mm × 1mm, ndipo zapano ndi 350mA Chifukwa cha kuchuluka kwa kugwiritsidwa ntchito pakali pano, vuto la kutulutsa kutentha kwakhala vuto lalikulu. Tsopano vutoli lathetsedwa ndi chip flip. Ndi chitukuko cha ukadaulo wa LED, kugwiritsa ntchito kwake pakuwunikira kudzakumana ndi mwayi ndi zovuta zomwe sizinachitikepo.

Kodi Flip Chip ndi chiyani? Mapangidwe ake ndi otani? Kodi ubwino wake ndi wotani?

Blue LED nthawi zambiri imagwiritsa ntchito gawo lapansi la Al2O3. Gawo laling'ono la Al2O3 lili ndi kuuma kwakukulu, kutsika kwamafuta otsika komanso kuwongolera. Ngati dongosolo labwino likugwiritsidwa ntchito, kumbali imodzi, lidzayambitsa mavuto odana ndi static, kumbali ina, kutentha kwa kutentha kudzakhalanso vuto lalikulu pansi pa zochitika zamakono. Panthawi imodzimodziyo, chifukwa electrode yakutsogolo ikuyang'ana mmwamba, gawo la kuwala lidzatsekedwa, ndipo kuwala kowala kudzachepetsedwa. Kuwala kwamtundu wa buluu wokwera kwambiri kumatha kutulutsa bwino kwambiri kuposa ukadaulo wamapaketi achikhalidwe kudzera muukadaulo wa chip flip chip.

Njira yamakono yosinthira mawonekedwe ndi: choyamba, konzani chipangizo chachikulu cha buluu cha LED chokhala ndi electrode yowotcherera ya eutectic, nthawi yomweyo, konzani gawo lapansi la silicon lalikulu pang'ono kuposa chipangizo cha buluu la LED, ndikupanga wosanjikiza wa golide ndi waya wotsogolera. wosanjikiza (akupanga golide waya mpira solder olowa) kwa eutectic kuwotcherera. Kenako, chip champhamvu champhamvu chabuluu cha LED ndi gawo lapansi la silicon zimalumikizidwa pamodzi pogwiritsa ntchito zida zowotcherera za eutectic.

Kapangidwe kameneka kamadziwika ndi kuti epitaxial wosanjikiza imalumikizana mwachindunji ndi gawo lapansi la silicon, ndipo kukana kwamafuta kwa gawo lapansi la silicon kumakhala kotsika kwambiri kuposa gawo la safiro, kotero vuto la kutentha kwapakati limathetsedwa bwino. Popeza gawo lapansi la safiro likuyang'ana m'mwamba pambuyo pa kutembenuka, limakhala malo otulutsa kuwala. Sapphire ndi yowonekera, kotero vuto lotulutsa kuwala limathetsedwanso. Zomwe zili pamwambazi ndi chidziwitso choyenera cha teknoloji ya LED. Ndikukhulupirira kuti ndi chitukuko cha sayansi ndi zamakono, nyali za LED m'tsogolomu zidzakhala zowonjezereka, ndipo moyo wawo wautumiki udzakhala wabwino kwambiri, kutibweretsera ife kumasuka.