1. 
   Band Gap
   In a semiconductor, the energy difference between the highest valence band and the lowest conduction band.
   Found op http://www.encyclo.co.uk/local/21690
   
   
2. 
   band gap
   (from the article `superconductivity`) As stated above, the thermal properties of superconductors indicate that there is a gap in the distribution of energy levels available to the ... ...approaches infinity. The molecular orbitals then form a band of energies. Another similar band can be formed by ...
   Found op http://www.britannica.com/eb/a-z/b/15
   
   
3. 
   Band gap
   In solid state physics, a band gap, also called an energy gap or bandgap, is an energy range in a solid where no electron states can exist. In graphs of the electronic band structure of solids, the band gap generally refers to the energy difference (in electron volts) between the top of the valence...
   Found op http://en.wikipedia.org/wiki/Band_gap
   
   
4. 
   band gap
   Different photovoltaic materials have different energy band gaps. Photons with energy equal to the band gap energy are absorbed to create free electrons. Photons with less energy than the band gap energy pass through the material In a semiconductor, such as silicon, the energy difference betwee...
   Found op http://www.daviddarling.info/encyclopedia/B/AE_band_gap.html
   
   
5. 
   Bandgap
   For semiconductors and insulators, this is the range of energies between existing energy bands where no energy levels exist. For intrinsic materials, electrons are forbidden to have energies within this range.
   Found op http://www.diracdelta.co.uk/science/source/b/a/bandgap/source.html
   
   

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