SOLA2060: INTRODUCTION TO ELECTRONIC DEVICES
INTRODUCTION TO ELECTRONIC DEVICES
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SOLA2060: INTRODUCTION TO ELECTRONIC DEVICES
DURATION: 50 minutes, including reading time
Exam has 6 pages in total
Part A is 5 questions worth total of 10 marks
Part B is 2 questions worth total of 40 marks. They are NOT of equal value.
Answer ALL of the questions.
Written answers must be in ink. Pencils may only be used for drawing, sketching
or graphical work. Make sure your images are clear when you upload them.
Do Not Forget Units in Your Answers. No units, no marks!
Information Sheet
Planck’s constant: ℎ = 6.63 × 10−34 J.s
Reduced Planck constant: ħ = ℎ
2 = 1.055 × 10−34 J.s
Boltzmann’s constant: = 1.38 × 10−23J/K
Electronic charge: = 1.6 × 10−19 C
Mass of electron: 0 = 9.1 × 10−31kg
Relative permittivity (dielectric constant) of Si = 11.9
Relative permittivity of SiO2 = 3.9
Permittivity of vacuum = 8.85 × 10−14 F/cm
Bulk Si electron mobility = 1350 cm2/V.s
Bulk Si hole mobility = 480 cm2/V.s
Thermal energy of electron at 300 K = 25.8 meV
Speed of Light: = 2.98 × 1010 cm/s
For silicon at room temperature (300° K) use the following ‘typical’ values:
= 1 × 1010cm−3, = 1.12 eV, = 0.5 μs, = 0.2 μs
For GaAs at room temperature (300° K) use the following ‘typical’ values:
= 1.42 eV and the refractive index (n) = 3.66 for wavelengths above 600 nm