LECTURE 10.2LECTURE 10.2

OUTLINEOUTLINE

Electronic Properties 2Electronic Properties 2

ELECTRONIC PROPERTIES IIELECTRONIC PROPERTIES II

Free Electrons, and Electron Holes in Covalently Bonded Free Electrons, and Electron Holes in Covalently Bonded MaterialsMaterials

Motion of Free Electrons and Electron HolesMotion of Free Electrons and Electron Holes The PhotoresistorThe Photoresistor n-Type and p-Type Extrinsic Semiconductorsn-Type and p-Type Extrinsic Semiconductors The Solid-State Rectifier or DiodeThe Solid-State Rectifier or Diode The Solar CellThe Solar Cell

COVALENT BONDING AND FREE COVALENT BONDING AND FREE ELECTRON/ ELECTRON HOLE PAIRSELECTRON/ ELECTRON HOLE PAIRS

CREATION OF ELECTRON/HOLE PAIRS BY CREATION OF ELECTRON/HOLE PAIRS BY LIGHT PHOTONS AND THERMAL VIBRATIONSLIGHT PHOTONS AND THERMAL VIBRATIONS

IONIZATION ENERGIES AND IONIZATION ENERGIES AND BAND-GAP ENERGIESBAND-GAP ENERGIES

MOTION OF A FREE ELECTRON AND MOTION OF A FREE ELECTRON AND AN ELECTRON HOLEAN ELECTRON HOLE

THE PHOTORESISTOR, OR THE PHOTORESISTOR, OR THE LIGHT METERTHE LIGHT METER

N-TYPE AND P-TYPE DONOR N-TYPE AND P-TYPE DONOR IMPURITIESIMPURITIES

p-Type (Group p-Type (Group III)III)BBAlAlGaGaInInTlTl

n-Type (Group V)n-Type (Group V)NNPPAsAsSbSbBiBi

A FREE ELECTRON IN AN n-A FREE ELECTRON IN AN n-TYPE SEMICONDUCTORTYPE SEMICONDUCTOR

AN ELECTRON HOLE IN A p-AN ELECTRON HOLE IN A p-TYPE SEMICONDUCTORTYPE SEMICONDUCTOR

MOTION OF AN ELECTRON MOTION OF AN ELECTRON HOLEHOLE

FREE ELECTRON/ELECTRON HOLE FREE ELECTRON/ELECTRON HOLE MOTION IN A “DIODE”MOTION IN A “DIODE”

CURRENT/VOLTAGE CURRENT/VOLTAGE CHARACTERISTICS OF A SOLID-CHARACTERISTICS OF A SOLID-

STATE “DIODE”STATE “DIODE”

THE SOLAR CELLTHE SOLAR CELL