1. LECTURE 10.2

2. OUTLINE Electronic Properties 2 Electronic Properties 2

3. ELECTRONIC PROPERTIES II Free Electrons, and Electron Holes in Covalently Bonded Materials Free Electrons, and Electron Holes in Covalently Bonded Materials Motion of Free Electrons and Electron Holes Motion of Free Electrons and Electron Holes The Photoresistor The Photoresistor n-Type and p-Type Extrinsic Semiconductors n-Type and p-Type Extrinsic Semiconductors The Solid-State Rectifier or Diode The Solid-State Rectifier or Diode The Solar Cell The Solar Cell

4. COVALENT BONDING AND FREE ELECTRON/ ELECTRON HOLE PAIRS

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

6. IONIZATION ENERGIES AND BAND-GAP ENERGIES

7. MOTION OF A FREE ELECTRON AND AN ELECTRON HOLE

8. THE PHOTORESISTOR, OR THE LIGHT METER

9. N-TYPE AND P-TYPE DONOR IMPURITIES p-Type (Group III) p-Type (Group III) B Al Al Ga Ga In In Tl Tl n-Type (Group V) n-Type (Group V) N P As Sb Bi

10. A FREE ELECTRON IN AN n- TYPE SEMICONDUCTOR

11. AN ELECTRON HOLE IN A p- TYPE SEMICONDUCTOR

12. MOTION OF AN ELECTRON HOLE

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

14. CURRENT/VOLTAGE CHARACTERISTICS OF A SOLID- STATE “DIODE”

15. THE SOLAR CELL