Question

What is the crystal lattice of semiconductors Si and GaAs? Draw the crystal structures and write down the similarities (2) and differences (2)

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Answer 1

Explanation:

.1 Primitive lattice Cell

An ideal crystal is constructed by the infinite repetition of identical structural units in space. In the simplest crystals the structural unit is a single atom, as in copper, silver, gold, iron, aluminium, and the alkali metals.

The structure of all crystals can be described in terms of a lattice, with a group of atoms attached to every lattice point. The group of atoms is called the basis; when repeated in space it forms the crystal structure. The basis consists of a primitive cell, containing one single lattice point. Arranging one cell at each lattice point will fill up the entire crystal. 

  

 

1.2 Simple Crystal Structures

There are several types of crystal structures. The simplest one is the simple cubic lattice (sc). Two other cubic lattices are the body-centered (bcc) and the face-centered (fcc) cubic lattice.

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