This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 2 4. The bonding model for GaAs is pictured in Figure 1. (a) Draw the bonding model for GaAs depicting the removal of the shaded Ga and As atoms in Figure 1 . HINT: Ga and As take their bonding electrons with them when they are removed from the lattice. Also see Figure 2 showing the results of removing an atom from the Si lattice. (b) Redraw the bonding model for GaAs showing the insertion of Si atoms into the missing Ga and As atom sites. (c) Is the GaAs doped p-type or n-type when Si atoms replace Ga atoms? Explain. (d) Is the GaAs doped p-type or n-type when Si atoms replace As atoms? Explain. (e) Draw the energy band diagram for GaAs when GaAs is doped with Si on (i) Ga sites and (ii) on As sites. Include Fermi, intrinsic, conduction and valence energy levels. Figure 1: Bonding Model for GaAs lattice. (Shaded atoms are to be removed). Figure 2: Result of removing an Si atom from the Si lattice structure....
View Full Document
This note was uploaded on 07/27/2011 for the course ECE 340 taught by Professor Leburton during the Spring '11 term at University of Illinois, Urbana Champaign.
- Spring '11