ECE250_F02_HW3_S

ECE250_F02_HW3_S - ECE 250 HW #2 Solution Define units and...

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The value appears O.K. V bi_GaAs 300 K ( ) 1.158V = Test the function at 300 K and compare to the value in the notes: V bi_GaAs T ( ) K B T q ln N a N d n i_GaAs T ( ) 2 = Define a function for the built-in barrier potential n i_GaAs T ( ) B GaAs T 1.5 exp E g_GaAs - 2 K B T = Define functions for the intrinsic carrier concentration N a 10 16 cm 3 - = N d 10 16 cm 3 - = Problem 1: q 1.602 10 19 - coul = B GaAs 2.1 10 14 1 cm 3 K 1.5 = E g_GaAs 1.4 eV = Specify some constants for silicon K B 86 10 6 - eV K = eV 1.602 10 19 - coul volt = Define units and constants ECE 250 HW #2 Solution
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Plot the function. Define the range of temperatures. (0 C to 70 C) T 273 K 274K , 343 K .. = 0 10 20 30 40 50 60 70 1.1 1.12 1.14 1.16 1.18 Built-in Barrier Potential Temperature (*C) Potential (Volts) V bi_GaAs T ( ) T 273 K - The y-axis need not be a log scale because the value of Vbi soes not change several orders of magnitude over the range of temperatures.
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V T 25.8mV = N 1.2 = I S 3.7 10 14 - A = R th 833 = V th 2.5 V = Initial Guesses I D 1 mA = V D 0.7 V = Given I D V th V D - R th = I D I S exp V D N V T 1 - = V
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ECE250_F02_HW3_S - ECE 250 HW #2 Solution Define units and...

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