In analytical calculations we assume the following empirical expression for the band-gap narrowing:
This model is in very good agreement with quite scattered experimental data from
literature [505][470][327][307][110]. We have recalculated those
original data from the cited papers, which have been obtained by measuring the
product, assuming the same values for the density of states 
,
and the band gap 
- those used
in MINIMOS [417][160] - for all data.
After the recalculation, no better agreement between the data from different
sources has been achieved. Recently, however, D.Klaassen has recalculated the
data from different sources employing a quite improved model for the low-field
mobility of minority carriers, which is developed by the same author. Compared
to these data for the total electrical band-gap narrowing [252],
expression A.25 agrees fairly good for 
,
while it overestimates the new data at higher 
.
