Dab tsi yog txwv tsis pub muaj zog sib txawv?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Kev sib cais ntawm valence band thiab kev coj ua band yog lub npe hu ua txwv tsis pub lub zog sib txawv . Ifan electron yuav tsum tau hloov los ntawm valence band toconduction band , sab nraud zog yuav tsum tau, uas yog sib npaug rau cov txwv tsis pub lub zog sib txawv.

Ib yam li ntawd, tej zaum koj yuav nug, dab tsi yog qhov txwv tsis pub?

Kev cais ob pawg no yog lub zog qhov sib txawv , npe txwv tsis pub kis , nyob rau hauv uas electrons tsis tuaj yeem ib txwm muaj. Lub zog yuav tsum tau hloov lub electron ntawm valenceband mus rau conduction band, lub zog sab nraud uas yuav tsum tau sib npaug rau txwv tsis pub zog qhov sib txawv.

Tsis tas li ntawd, vim li cas thiaj hu ua txwv tsis pub muaj zog sib txawv? Kev faib cov ntaub ntawv raws li txwv . Cov ntaub ntawv uas tsis tso cai rau ntws ntawm hluav taws xob los ntawm lawv yog hu ua raws li insulators. Cov zog gap ntawm insulator yog kwv yees li ntawm 15 electron volts (eV). Cov electrons hauv valence band txav tsis tau vim lawv raug kaw ntawm cov atoms.

Kuj nug, dab tsi yog txwv tsis pub lub zog sib txawv hauv cov khib nyiab?

Feem ntau khov kho cov khoom yog insulators, thiab interms ntawm cov band txoj kev xav ntawm cov khoom khib nyiab qhov no txhais tau hais tias muaj qhov loj txwv tsis pub kis nruab nrab ntawm lub zog ntawm thevalence electrons thiab cov zog ntawm qhov uas cov electrons tuaj yeem txav mus los ntawm cov khoom siv (cov conduction band ).

Lub zog band sib txawv yog dab tsi?

A band sib yog qhov kev ncua deb ntawm valence band ntawm electrons thiab conduction band . Qhov tseem ceeb, cov band sib sawv cev qhov tsawg kawg nkaus zog uas yuav tsum tau excite ib tug electron mus rau ib tug statein conduction band qhov twg nws tuaj yeem koom nrog inconduction.