22.02.25Lub Quantum Efficiency (QE) ntawm ib lub sensor hais txog qhov tshwm sim ntawm photons tsoo lub sensor raug kuaj pom hauv %. QE siab ua rau lub koob yees duab rhiab dua, muaj peev xwm ua haujlwm hauv cov teeb pom kev qis. QE kuj tseem nyob ntawm wavelength, nrog QE qhia raws li ib tus lej feem ntau xa mus rau tus nqi siab tshaj.
Thaum photons tawm tsam lub koob yees duab pixel, feem ntau yuav mus txog thaj chaw teeb pom kev zoo, thiab raug kuaj pom los ntawm kev tso cov hluav taws xob hauv silicon sensor. Txawm li cas los xij, qee qhov photons yuav raug absorbed, xav txog, los yog tawg los ntawm cov ntaub ntawv ntawm lub koob yees duab sensor ua ntej nrhiav tau qhov chaw. Kev sib cuam tshuam ntawm cov photons thiab cov ntaub ntawv ntawm lub koob yees duab sensor nyob ntawm qhov photon wavelength, yog li qhov tshwm sim ntawm kev kuaj pom yog nyob ntawm wavelength. Qhov kev vam khom no tau pom hauv lub koob yees duab Quantum Efficiency Curve.
Piv txwv ntawm Quantum Efficiency nkhaus. Liab: Back-sab-illuminated CMOS. Xiav: Advanced Front-sab-illuminated CMOS
Cov koob yees duab sib txawv tuaj yeem muaj QE sib txawv nyob ntawm lawv cov qauv tsim thiab cov khoom siv. Qhov kev cuam tshuam loj tshaj plaws ntawm QE yog seb lub koob yees duab lub sensor yog rov qab- lossis sab pem hauv ntej illuminated. Nyob rau hauv pem hauv ntej-sab illuminated koob yees duab, photons los ntawm qhov kev kawm yuav tsum xub hla ib daim phiaj ntawm thaiv ua ntej yuav raug kuaj. Keeb kwm, cov koob yees duab no tau txwv rau quantum efficiency ntawm ib ncig ntawm 30-40%. Kev taw qhia ntawm microlenses kom pom lub teeb dhau los ntawm cov xov hlau mus rau hauv lub teeb-sensitive silicon tsa qhov no mus txog 70%. Cov koob yees duab pem hauv ntej-illuminated niaj hnub tuaj yeem ncav cuag QEs ntawm thaj tsam 84%. Back-illuminated koob yees duab thim rov qab no sensor tsim, nrog photons ncaj qha mus tsoo lub thinned lub teeb-nrhiav txheej ntawm silicon, tsis dhau los ntawm thaiv. Cov koob yees duab sensors muaj ntau dua quantum efficiencies nyob ib ncig ntawm 95% ncov, ntawm tus nqi ntawm ib tug ntau intensive thiab kim txheej txheem.
Quantum Efficiency yuav tsis yog ib qho tseem ceeb hauv koj daim ntawv thov kev yees duab. Rau cov ntawv thov nrog cov teeb pom kev siab, nce QE thiab rhiab heev muaj qhov zoo me ntsis. Txawm li cas los xij, hauv kev pom lub teeb qis, QE siab tuaj yeem ua kom zoo dua cov teeb liab-rau-suab nrov-sib piv thiab cov duab zoo, lossis txo lub sij hawm raug rau cov duab nrawm dua. Tab sis qhov zoo ntawm ntau dua quantum efficiency yuav tsum tau hnyav tiv thaiv 30-40% nce nqi ntawm back-illuminated sensors.
