From the following  curve of energy  of band gap (in eV)  versus temperature (in K) Identify  the semi conductors

The  energy  band gap of semi conductors decreases  as temperature increases                                  At T=300K  energy band gap of                                  Germanium = 0.66 eV,                                   Silicon  = 1.12eV,                                  Gallium Arsenide  =  1.42eV