87.0 Introduction I Some Semiconductor Physics Background A) Energy Band CB E >2ev 绝缘体 Forbid E E.≈0 金属 F g E E∈(0~2eV→半导体 VB E electrons B Electrons Energy hol 导带:Fh2k Solid state Semiconductor 2m E 价带:Eh2k2 2m k 直接禁带半导体 (Direct Gap semiconductor)§7.0 Introduction I. Some Semiconductor Physics Background A) Energy Band Eg 2eV 绝缘体 E 0 g 金属 Eg (0 ~ 2)eV 半导体 B) Electrons Energy mc k 2 E 2 2 c 导带: = mv k 2 E 2 2 v 价带: = 直接禁带半导体 (Direct Gap Semiconductor) E1 E2 En . . . Solid State EF Eg N N N Semiconductor CB VB electrons holes Forbidden Gaps Eg k E