Finite element analysis of SiGe npn HBT
A two dimensional general purpose device simulator (BISOF), based on finite element method, has been developed. The various material parameters, such as dielectric constant, energy bandgap, intrinsic carrier concentration, mobilities and life time etc., which vary with position due to the spatial variation of the composition of the have been taken into account. An npn heterojunction bipolar transistor has been analysed and the dependence of the device characteristics on the various Ge mole-fraction material parameters has also been studied using the program.<<ETX>>