Semiconductor Crystals - Physics Department - University College ...

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The Conventional Unit Cell A unit cell just fills space whentranslated through a subset ofBravais lattice vectors. The conventional unit cell ischosen to be larger than theprimitive cell, but with the fullsymmetry of the Bravais lattice. The size of the conventional cell isgiven by the lattice constant a.Crystal Structure 51Primitive and conventional cells of FCCCrystal Structure 5226
Primitive and conventional cells-hcppoints of primitive cellHexagonal close packed cell (hcp):conventional =primitive cellcFractional coordinates:100, 010, 110, 101,011, 111,000, 001baCrystal Structure 53Primitive Unit Cell and vectorsA primitive unit cell is made of primitivetranslation vectors a 1 ,a 2 , and a 3 such thatthere is no cell of smaller volume that canbe used as a building block for crystalstructures.A primitive unit cell will fill space by repetitionof suitable crystal translation vectors. Thisdefined by the parallelpiped a 1 , a 2 and a 3 .The volume of a primitive unit cell can befound by V = a 1 .(a 2 x a 3 ) (vector products) Cubic cell volume = a 3Crystal Structure 5427
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 and 16: Polycrystalline SolidPolycrystal is
Page 17 and 18: Crystal StructureCrystal structure
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: Three common Unit Cell in 3DCrystal

Semiconductor Crystals - Physics Department - University College ...

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