Question $\backslash$# $4/6$: npn HBT $(17$ Points$)$

$($a$)$ Connect two batteries between E$,$ B $\backslash$& C to bias the transistor in normal mode.

$($b$)$ Label the fluxes $(1,2$ or $3)$ associated with

$-$ electrons injected by the emitter in the base and collected by the collector:

$-$ electrons injected by the emitter in the base and recombinating with holes:

$-$ holes injected by the base in the emitter and recombining with electrons:

$($c$)$ Circle the band diagram feature which is critical in making flux $(1)$ smaller than flux