Intrinsic and Extrinsic Semi-conduction (n-type and p-type semi-conductance)

Intrinsic and Extrinsic Semi-conduction (n-type and p-type semi-conductance) : Silicon and Germanium are the most important commercial examples of semiconductors. The crystal structure of both silicon and germanium are similar to that of diamond.

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Defect in Non-Stoichiometric Crystals (Metal Excess Defect and Metal Deficient Defect)

Defect in Non-Stoichiometric Crystals (Metal Excess Defect and Metal Deficient Defect) : Non-stoichiometric compounds are those in which the numbers of positive and negative ions are different in the ratios as indicated by their chemical formulae but crystal remains neutral.

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Square Close Packing and Hexagonal Close Packing in Two Dimension

The spheres in second row are exactly above those of the first row. The second row is exactly same as the first one. If we label the first row as ‘A’ type, the second row is also ‘A’ type.

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