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EngineeringElectrical EngineeringMaterials ScienceMicroelectronicsSemiconductor DevicesSemiconductor MaterialsBipolar Junction TransistorsIntegrated Circuit DesignIntegrated Circuit DevicesSemiconductor Device MaterialsSemiconductor HeterostructuresSemiconductor PhysicsHeterojunction Bipolar TransistorsHeterojunctionsSilicon Germanium Bipolar Transistor