Determine the drift velocity of electrons in a solid if the average kinetic energy of the electrons (over and above the
thermal energy) is 10 meV. Assume me*=m0.
m/s=0.59 x 105 m/s.
The drift velocity Vd
1. What is the physical significance of the built-in voltage Vbi? Compute its value when NA = N 0 = 10 x n; (n; is the
intrinsic carrier density). T = 300 K. Is it possible for the built-in voltage of a p-n junction to be larger than the e
ELEC412 HW#1 (2017)
Due in 2 weeks (Jan 18)
Make any reasonable assumptions. Assume T = 300K unless otherwise specified.
1. Determine the drift velocity of electrons in a solid if the average kinetic energy of the electrons (over and
above the thermal ene
Temperature gradient generating charge
Thermoelectric cooling in p-n junction
Thermoelectric power n = V/T = k/q (ln(NC/n) + A), where A is the thermoelectric constant.
iii:ramwe Devices , I u l
Briey explain how the impact ionization avalanche transit time :titme't_l}i§l;tl l ,i WUA'KS.
Explain the physicat origin of [he itcgatisve differential mohiiity' etlcct in traits. r '
;¥~Using the Ceniinuity equat
Q I. a) This electric field distribution ofan MOS structure is constant If: 30 kvmn} inside the
oxide layer which has a thickness ol'0.2 gun. I! then drops ahmptly to a value of if? Id/v'cm at ilw
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