How many vertex, edges, faces and centres are there in a cubic unit cell?

 In a cubic unit cell,there are 8 vertex, 12 edges, 6 faces and one body centre.
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What is Photovoltaic.

Photovoltaics (PV) is a method of generating electrical power by converting solar radiation into direct current electricity using semiconductors that exhibit the photovoltaic effect. Example-amorphous silica.
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What is meant by octahedral void in a close-packed structure?

If a triangular void pointing up in one close-packed layer is covered by a triangular void pointing down in the adjacent layer, then a void surrounded by six spheres results Such a void is called an octahedral void since the six spheres surrounding it lie at the corners of a regular octahedron.

                    octahedral void
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What is meant by tetrahedral void in a close-packed structure?


 It is the empty space between three spheres in one layer and one sphere in the layer above it or one sphere in the layer below it is called a tetrahedral void
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Although pure silicon is an insulator, then how does it behave as a semiconductor on heating.

On heating some covalent bonds among silicon atoms break on heating and electrons become free to move under applied field, hence silicon behaves like semi-conductor at high temperature.
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