Ukadaulo watsopano wa thin silicon photodetector

Ukadaulo watsopano wawoonda silicon photodetector
Zojambulajambula za Photon zimagwiritsidwa ntchito kupititsa patsogolo kuyamwa kwa kuwala muzochepasilicon photodetectors
Makina opanga mafoto akuyamba kukopa chidwi pamapulogalamu ambiri omwe akubwera, kuphatikiza kulumikizana ndi kuwala, kuzindikira kwa liDAR, ndi kujambula kwachipatala. Komabe, kufalikira kwa ma photonics pamayankho aukadaulo amtsogolo kumadalira mtengo wopangirama photodetectors, zomwenso zimadalira kwambiri mtundu wa semiconductor womwe umagwiritsidwa ntchito kutero.
Mwachizoloŵezi, silicon (Si) yakhala ikugwiritsidwa ntchito kwambiri popanga zida zamagetsi, kotero kuti mafakitale ambiri akhwima mozungulira nkhaniyi. Tsoka ilo, Si ili ndi mphamvu yoyamwitsa yopepuka yocheperako mu sipekitiramu yapafupi ya infrared (NIR) poyerekeza ndi ma semiconductors ena monga gallium arsenide (GaAs). Chifukwa cha izi, ma GaAs ndi ma alloys ogwirizana nawo akuyenda bwino muzojambula zazithunzi koma sagwirizana ndi njira zachikhalidwe zopangira zitsulo zachitsulo-oxyde semiconductor (CMOS) zomwe zimagwiritsidwa ntchito popanga zida zambiri zamagetsi. Izi zinapangitsa kuti ndalama zawo zopangira ziwonjezeke kwambiri.
Ochita kafukufuku apanga njira yowonjezera kwambiri kuyamwa kwa infrared mu silicon, zomwe zingapangitse kuchepetsa mtengo wa zipangizo zamakono zopanga zithunzi, ndipo gulu lofufuza la UC Davis likuchita upainiya wa njira yatsopano yopititsira patsogolo kuyamwa kwa kuwala mu mafilimu a silicon woonda. M'mapepala awo aposachedwa ku Advanced Photonics Nexus, akuwonetsa kwa nthawi yoyamba chiwonetsero choyesera cha silicon-based photodetector yokhala ndi mawonekedwe opepuka ang'onoang'ono - ndi mawonekedwe a nano-surface, kukwaniritsa kusintha kosayerekezeka kofanana ndi GaAs ndi ma semiconductors ena a gulu la III-V. . Photodetector imakhala ndi mbale ya silicon yokhuthala yaying'ono yomwe imayikidwa pagawo lotsekereza, "zala" zachitsulo zomwe zimatuluka ngati mphanda kuchokera kuchitsulo cholumikizana pamwamba pa mbaleyo. Chofunika kwambiri, silicon ya lumpy imadzazidwa ndi mabowo ozungulira omwe amakonzedwa mwanjira ya periodic yomwe imakhala ngati malo ojambulidwa ndi photon. Kapangidwe kake kachipangizo kamapangitsa kuti kuwala kochitika kawirikawiri kupindike pafupifupi 90 ° ikagunda pamwamba, ndikupangitsa kuti ifalikire motsatana ndi ndege ya Si. Njira zofalitsira zam'mbalizi zimawonjezera kutalika kwa kuyenda kwa kuwala ndikuchepetsako bwino, zomwe zimapangitsa kuti pakhale kuyanjana kokulirapo komanso kuyamwa.
Ofufuzawo adachitanso zoyeserera zowunikira komanso kusanthula kwamalingaliro kuti amvetsetse bwino zomwe zimachitika pamapangidwe amtundu wa Photon, ndipo adayesa kangapo kuyerekeza ma photodetectors ndi opanda iwo. Iwo adapeza kuti kujambula kwa photon kunapangitsa kusintha kwakukulu kwa mayamwidwe a Broadband mu mawonekedwe a NIR, kukhala pamwamba pa 68% ndi chiwongoladzanja cha 86%. Ndikoyenera kudziwa kuti pafupi ndi bandi ya infuraredi, mphamvu yoyamwa ya Photon Capture Photodetector ndiyokwera kangapo kuposa ya silicon wamba, kupitilira gallium arsenide. Kuphatikiza apo, ngakhale kapangidwe kameneka ndi ka 1μm wandiweyani wa silicon mbale, zofananira za 30 nm ndi 100 nm silicon mafilimu ogwirizana ndi CMOS zamagetsi amawonetsa magwiridwe antchito ofanana.
Ponseponse, zotsatira za kafukufukuyu zikuwonetsa njira yodalirika yopititsira patsogolo magwiridwe antchito a silicon-based photodetectors pamapulogalamu omwe akubwera. Mayamwidwe apamwamba amatha kupezeka ngakhale mu zigawo zowonda kwambiri za silicon, ndipo mphamvu ya parasitic ya dera imatha kukhala yotsika, yomwe ndi yofunika kwambiri pamakina othamanga kwambiri. Kuphatikiza apo, njira yomwe yaperekedwayi ikugwirizana ndi njira zamakono zopangira CMOS motero ili ndi kuthekera kosintha momwe ma optoelectronics amaphatikizidwira m'mabwalo achikhalidwe. Izi, zitha kuyambitsa njira yodumphadumpha pamakompyuta otsika mtengo kwambiri komanso ukadaulo wojambula.