1) An abrupt Si p-n* junction of cross sectional area 10 cm² is operated at 300K and has the following properties: p-side: N, =10'" cm³, Tm = 10 µs; n-side: N, »N,. a) Calculate the built-in potential. Hint: use half the band gap energy for the Fermi level shift for the n-side. b) Calculate the junction width at a reverse bias of 20 V. c) Calculate the peak electric field at a reverse bias of 20 V.

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1) An abrupt Si p-n" junction of cross sectional area 10 cm' is operated at 300K and has the
following properties: p-side: N. = 10" cm ', T, = 10 us; n-side: N, » N,. a) Calculate the built-in
potential. Hint: use half the band gap energy for the Fermi level shift for the n-side. b) Calculate the
junction width at a reverse bias of 20 V. c) Calculate the peak electric field at a reverse bias of 20 V.
d) Calculate the junction capacitance at a reverse bias of 20 V. e) Calculate the excess electron
concentration on the p-side of the depletion zone An = npo (ext – 1) at a forward bias of 0.7643 V.
) Calculate the stored electron charge due to the electron diffusion current on the p side of the junction
at the forward bias of part e (forward current 20 mA). The calculation of part (f) can be done by
integrating the minority charge density on the p-side, Q = -qA S" An e-x/hn dx.
Transcribed Image Text:1) An abrupt Si p-n" junction of cross sectional area 10 cm' is operated at 300K and has the following properties: p-side: N. = 10" cm ', T, = 10 us; n-side: N, » N,. a) Calculate the built-in potential. Hint: use half the band gap energy for the Fermi level shift for the n-side. b) Calculate the junction width at a reverse bias of 20 V. c) Calculate the peak electric field at a reverse bias of 20 V. d) Calculate the junction capacitance at a reverse bias of 20 V. e) Calculate the excess electron concentration on the p-side of the depletion zone An = npo (ext – 1) at a forward bias of 0.7643 V. ) Calculate the stored electron charge due to the electron diffusion current on the p side of the junction at the forward bias of part e (forward current 20 mA). The calculation of part (f) can be done by integrating the minority charge density on the p-side, Q = -qA S" An e-x/hn dx.
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