半导体元件classbfs120911205413713.pdf

半導體元件 Semiconductor Devices 1947 1st transistor invented 半導體元件( Semiconductor Devices ) • 電子元件( electronic devices ) 二極體( diode ) 雙極電晶體( bipolar junction transistor, BJT ) 場效電晶體( field effect transistor, FET ) • 光電元件( opto-electronic devices ) 通電發光: 發光二極體( light emitting diode, LED ) 雷射二極體( laser diode ) 吸光發電: 光檢測器( photo-detector ) 太陽電池( solar cell ) Metal-Metal Junction : The Contact Potential 光電效應( Photoelectric Effect ) : 單頻光 C : metal plate , cathode ( 陰極) ( monochromatic light ) , u A : anode ( 陽極) , collector ( 真空管) V : retarding voltage A: C: Ammeter : to measure photoelectron current ( with the same light Intensity ) V  u o V stopping potential, Cs Cu V o Frequency, u hu = Ek + Eb , Ek : K.E. of the ejected electron Eb : binding energy of the electron with fixed u, if Eb   Ek   Ek,max = hu – F