BandGap:

------------------------------------------------------------------------
   Photodiode bandgap.
   This is the efficiency when exposed to monochromatic light in the
   bandgap. At 0 deg-K the efficiency will be 1. Works for GaAs and Si.
------------------------------------------------------------------------
   Form:
   eG = BandGap( T, s )
------------------------------------------------------------------------

   ------
   Inputs
   ------
   T          (1,:) Temperature (deg-K)
   s          (1,:) Either 'silicon' or 'gallium arsenide' or
                    the data structure
                    .eG0   (1,1) Band gap at 0 deg-K (eV)
                    .alpha (1,1) Temperature coefficient (meV)
                    .beta  (1,1) Coefficent (deg-K}

   -------
   Outputs
   -------
   eG         (1,:) Bandgap (eV)
   

------------------------------------------------------------------------
   Reference: B. Van Zeghbroeck, "Chapter 4: P-N Junctions
                 http://ece-www.colorado.edu/~bart/book/book/
                 chapter2/pdf/ex2_2.pdf
------------------------------------------------------------------------

Children:

Common: Graphics/Plot2D