Piv txwv rau cov khoom siv tsis ncaj band sib txawv yog silicon (Si), germanium (Ge), aluminium arsenide (AlAs) thiab gallium phosphide (GaP).
Yuav ua li cas piv txwv ntawm indirect band gap?
Piv txwv ntawm cov ntaub ntawv ncaj qha muaj xws li amorphous silicon thiab qee cov khoom siv III-V xws li InAs thiab GaAs. Indirect bandgap cov ntaub ntawv suav nrog crystalline silicon thiab Ge. Qee cov ntaub ntawv III-V yog qhov tsis ncaj qha bandgap ib yam nkaus, piv txwv li AlSb.
Dab tsi yog qhov sib txawv ntawm qhov sib txawv ntawm cov semiconductor?
Nyob rau hauv ib qho kev sib txawv ntawm qhov sib txawv ntawm ib qho semiconductor, lub zog siab tshaj plaws ntawm qhov valence band tshwm sim ntawm tus nqi sib txawv ntawm lub zog mus rau qhov tsawg kawg nkaus hauv kev coj ua band zog: Qhov txawv ntawm ob yog qhov tseem ceeb tshaj plaws hauv cov khoom siv kho qhov muag.
Is coj indirect band gap semiconductor?
Tab sis yog tias koj muaj qhov sib txawv ntawm qhov sib txawv ntawm cov hluav taws xob thiab qhov muaj qhov sib txawv ��⃗ vector, thiab yog li lub sijhawm yuav tsum tau hloov pauv → koj yuav tau txais lub lattice vibriation, uas txhais tau tias koj yuav tau txais lub zog hauv daim ntawv. ntawm ib tug phonon ntawm lub recombination. Vim hais tias ntawm qhov LED muaj a semiconductor nrog qhov sib txawv ncaj qha.
Puas yog Silicon yog ib qho ncaj qha lossis tsis ncaj nraim ntawm qhov sib txawv semiconductor?
Nws paub zoo tias Si yog indirect band gap semiconductor nrog lub zog loj sib txawv ntawm qhov sib txawv ncaj qha (3.5 eV) thiab qhov sib txawv tsis ncaj (1.1 eV).
