Lub Diode yog tsim los ntawm PN kev sib tshuam, thiab lub photodiode tuaj yeem hloov cov teeb liab kho qhov muag rau hauv cov teeb liab hluav taws xob, raws li qhia hauv qab no:
Feem ntau, covalent daim ntawv cog lus yog ionized thaum lub PN hlws ris yog illuminated nrog lub teeb. Qhov no tsim lub qhov thiab electron khub. Lub photocurrent yog generated vim lub tiam ntawm electron-qhov teams. Thaum photons nrog lub zog tshaj 1.1 eV ntaus lub Diode, cov khub electron-qhov yuav raug tsim. Thaum lub photon nkag mus rau thaj tsam depleted ntawm Diode, nws tsoo lub atom nrog lub zog siab. Qhov no ua rau kev tso tawm ntawm electrons los ntawm cov qauv atomic. Tom qab cov electrons raug tso tawm, cov hluav taws xob dawb thiab qhov tau tsim tawm. Feem ntau, electrons raug them tsis zoo, thiab qhov raug them zoo. Lub zog depleted yuav muaj ib tug built-in electric teb. Vim tias qhov hluav taws xob hluav taws xob no, tus khub electron-qhov nyob deb ntawm PN kev sib tshuam. Yog li ntawd, lub qhov txav mus rau lub anode, thiab cov electrons txav mus rau cathode los tsim cov photocurrent.
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Cov khoom siv ntawm photodiode txiav txim siab ntau yam ntawm nws cov yam ntxwv. Cov yam ntxwv tseem ceeb yog nthwv dej ntawm lub teeb uas lub photodiode teb rau, thiab lwm yam yog lub suab nrov, ob qho tib si nyob ntawm cov khoom siv hauv photodiode. Cov ntaub ntawv sib txawv siv cov lus teb sib txawv rau cov wavelengths vim tias tsuas yog photons uas muaj lub zog txaus tuaj yeem ua rau cov khoom siv hluav taws xob hauv cov khoom sib txawv thiab ua kom muaj lub zog tseem ceeb los tsim tam sim no los ntawm photodiode.
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Txawm hais tias lub wavelength rhiab heev ntawm cov ntaub ntawv tseem ceeb, lwm qhov parameter uas yuav cuam tshuam rau kev ua tau zoo ntawm photodiodes yog lub suab nrov tsim. Vim tias lawv qhov sib txawv loj dua, silicon photodiodes tsim suab nrov tsawg dua germanium photodiodes. Txawm li cas los xij, nws tseem yuav tsum tau xav txog lub wavelength ntawm photodiode, thiab germanium photodiode yuav tsum tau siv rau wavelengths ntev tshaj 1000 nm.
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Cov saum toj no yog cov lus piav qhia ntawm Diode coj los ntawm Shenzhen HDV Phoelectron Technology Co., Ltd., uas yog cov chaw tsim khoom siv kho qhov muag thiab tsim cov khoom sib txuas lus. Zoo siab txais tos kojkev nug.