| 21. | As a result, there tend to be large band gaps between the core bands.
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| 22. | Note that the undoped narrow band gap material now has excess majority charge carriers.
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| 23. | The subwavelength periodicity distinguishes photonic metamaterials from photonic band gap or photonic crystal structures.
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| 24. | Each semiconductor has different electron affinity and band gap values.
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| 25. | The materials in these are semiconductors with narrow band gaps.
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| 26. | It is simply a wide band gap, highly doped diode.
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| 27. | Basically it is possible to gain any band gap between those of the three materials.
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| 28. | Molecular solids are typically insulators with large band gaps.
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| 29. | :Classification as metal / semiconductor / insulator is based on band gap and valence band.
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| 30. | The band gap of valence and conduction bands overlap.
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