Extraction of the emitter related space charge weighting factor parameters of HICUM L2.30 using the Lambert W function

The base-emitter (BE) depletion charge weighting factor h_jei accounts for the variation of the BE space charge region (SCR) with bias. In former HICUM model releases this weighting factor was a fixed model parameter value independent of device bias or temperature. With recent technology advancements and aggressively scaled vertical profiles incorporating significant germanium fractions a new model formulation was introduced. However the increased model complexity calls for a more sophisticated parameter extraction strategy. A novel extraction method is presented that is based on the solution of the new HICUM L2.30 formulation with the help of the Lambert W function. The extraction flow is presented and validated using a mature BiCMOS process technology available for mass-production.