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SSPD_Chapter 6_Part 9_Figure IX of the Appendix on Device Physics
Section III.3. Polysilicon emitter BJT (PEBJT)
Figure IX. Linear Gradient is a strong function of surface condition. Metal contact gives a large gradient and Poly Silicon contact to Emitter gives a much lower linear gradient on the emitter side thereby improving I Dn /I D (Injection Efficiency) by several orders of magnitude.
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