The base region is doped with \({{\rm{N}}_{\rm{D}}}{\rm{}} = {\rm{}}{10^{16}}{\rm{c}}{{\rm{m}}^{ - 3}}\). The ratio of minority holes in base to majority holes in emitter at the edge of space charge region is \(\frac{{{{\rm{p}}_{{\rm{nB}}}}}}{{{{\rm{p}}_{{\rm{pE}}}}}} = 1.83 \times {10^{ - 12}}\). Then, the concentration of minority carrier electrons in emitter \({{\rm{n}}_{{\rm{pE}}}} = {\rm{}}\)______ \(\rm \times{10^3}{\rm{c}}{{\rm{m}}^{ - 3}}.\)
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