  Several amorphous silicon structures were generated using a classical
molecular dynamics (MD) protocol of melting and quenching with different
quenching rates. An analysis of the calculated electronic properties of these
structures revealed that the midgap state density of a-Si which is of interest
for solar cell and thin film transistor applications can be correlated to bond
angle standard deviation. We also found that this parameter can strongly
determine the excess energy of a-Si, which is an important criteria in
theoretically generating realistic atomic structures of a-Si.
