Summary
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1.1 Semiconductor devices are at the heart of information technology. Elemental semiconductors such as Si appear in column IV of the periodic table, while compound semiconductors such as GaAs consist of elements symmetrically around column IV. More complicated alloy semiconductors are used to optimize optoelectronic properties.
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1.2 These devices are generally made in single-crystal material for best performance. Single crystals have long-range order, while polycrystalline and amorphous materials have short-range and no order, respectively.
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1.3 Lattices are determined by symmetry. In 3-D, these are called Bravais lattices. When we put a basis of atom(s) on the lattice sites, we get a crystal. Common semiconductors have an fcc symmetry ...
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