Semiconductor Crystals - Physics Department - University College ...

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CRYSTAL LATTICEWhat is crystal (space) lattice?In crystallography, only the geometrical properties of the crystalare of interest, therefore one replaces each atom by ageometrical point located at the equilibrium position of that atom.Platinum Platinum surface Crystal lattice andstructure of Platinum(scanning tunneling microscope)Crystal Structure 31Crystal Lattice An infinite array ofpoints in space,Each point has identicalsurroundings to allothers.yBbOCαaADxE Arrays are arrangedexactly in a periodicmanner.Crystal Structure 3216
Crystal StructureCrystal structure can be obtained by attaching atoms, groupsof atoms or molecules which are called basis (motif) to thelattice sides of the lattice point.Crystal Structure = Crystal Lattice + BasisCrystal Structure 33A two-dimensional Bravais lattice withdifferent choices for the basis17
Page 1 and 2: Physics PY4118Physics of Semiconduc
Page 3 and 4: Hybrid Orbitals Types of Hybrid Orb
Page 5 and 6: “sp 2 ” HybridizationBF 3Hybrid
Page 7 and 8: Oxygen Atom Bonding in H 2 O2p4 sp
Page 9 and 10: Physics PY4118Physics of Semiconduc
Page 11 and 12: III-V Semiconductors3 sp 3 orbitals
Page 13 and 14: Wurtzite LatticeView of tetrahedral
Page 15: Polycrystalline SolidPolycrystal is
Page 19 and 20: Crystal LatticeBravais Lattice (BL)
Page 21 and 22: Unit Cell in 2DThe smallest compone
Page 23 and 24: This is also a unit cell -it doesn
Page 25 and 26: Three common Unit Cell in 3DCrystal
Page 27 and 28: Primitive and conventional cells-hc

Semiconductor Crystals - Physics Department - University College ...

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