The effect of emitter junction bias on the low dose-rate radiation response of bipolar devices

It is shown that emitter-base junction bias is significant for low dose rate irradiation response of npn and pnp bipolar transistors. The effect is more pronounced for pnp transistor. Experimental results are explained in terms of fringing electric field model. The role of fringing field is confirmed by the radiation induced charge neutralization experiment. The experimental results on the effect of emitter junction bias on the elevated temperature high dose rate irradiation of bipolar devices and its application for low dose rate response simulation are discussed.