The Crystalline Solid State

Goals: Crystal Structures

7.1-7.1.3 Interpreting simple crystal structures

• Recognize/identify/describe simple cubic, face-centered cubic, and body-centered cubic unit cells
• Determine formulas for solids based on the unit cell of the crystalline solid
• Describe what it means to occupy a tetrahedral or octahedral hole of a given cubic cell

Goals: Molecular Orbitals and Conductivity

7.3-7.3.2 Explaining conductors, semiconductors, and insulators using molecular orbital ideas

• Describe how molecular orbitals can create bands in solids with infinite lattices
• Describe the basis for conductivity
• Identify conductors, semiconductors, and insulators based on MO/band diagrams
• Describe the effect of temperature on a semiconductor
• Describe how doping can modify the behavior of a semi conductor
• Draw and interpret MO/band diagrams for doped materials
• Describe how band gaps change when bulk solids are reduced to nanometer sized particles