ECE344 Semiconductor Materials and Devices (Fall 2008)

Professor Eric Polizzi


    Class Hours: M,W,F 11:15-12:05am in ELAB 304

    Office Hours (Eric Polizzi): M,W,F 1:15pm-2:15pm in Marcus 201C
    Office Hours (TA: Sudarshan Narayanan): Tue, Thu 11:30am-12:30am in Marcus 214

Syllabus


EXAMS
Mid-term/SOLUTIONS

FINAL EXAM
ELAB 303 on Thursday 12/18 at 8:00 a.m.


HOMEWORK
HW1
solution
HW2 solution
HW3 solution
HW4 solution
HW5 solution
Mosfet exercises


QUIZ
QUIZ1
QUIZ2
QUIZ3
QUIZ4
QUIZ5


Class Notes
Part I- From Atoms to Semiconductors (NOTES 1) (NOTES 2) (NOTES 3) (NOTES 4)

I- Introduction
1- Light
a- Blackbody radiation, b- Photoelectric effect
2- Electron
a- The Bohr atom, b- De-Broglie hypothesis, c- Consequences of duality wave-particle, d- Quantum effects

II- Semiconductor: Definitions

1- From One to Many Atoms
a- One electron system (H atom) , b- Many electrons system (Si atom), c- Two-atoms system, d- Many-atoms system
2- Energy Band Model
a- Valence band and Conduction band , b- Metal, Insulator or Semiconductor, c- Electrons and Holes in Semiconductors,
d- Intrinsic Semiconductors, e- Extrinsic Semiconductors
3- Bandstructures (Notions of)
a- Crystal structure , b- Effective mass approximation
II- Semiconductor: Fundamentals
1- Carrier Densities: Basics
a- Definition , b- Density of states, c- Distribution function d- Non-Degenerate semiconductors, e- carrier density calculations

1- Carrier Densities: Complement
a- Other expressions for n and p, b- How to calculate ni ?, c- Doped SC,  d- N-type and P-type SC, e- Where is Ei ?
f- Where is Ef ?, g- temperature dependence, h- Band bending


Part II- Theory of the Electrical Conduction (NOTES 1-2)

I- Introduction to Transport Models
1- Hierarchy of Transport Models
2- Carrier Transport: Basics

II- Drift-Diffusion Equations
1- Drift
a- Carrier Drift, b- Drift Current, c- Mobility, d- Resistivity, e- Band Bending
2- Diffusion
a- Carrier Diffusion, b- Diffusion Current
3- Total Current
4- Einstein Relationships


Part III- Device Operations

 I- P-N junctions (NOTES-1) (NOTES-2)
1- Introduction
2- Built-in potential
a- Basic, b- Energy band diagram
3- Unbiased junction
a- Depletion approximation, b- Solution for electric field, c- Solution for the potential,
d- Dimension of the depletion region, e- Summary

4- Biased junction
a- Definition, b-Forward bias, c- Reverse bias
5- I-V Characteristics
a- General Considerations, b-Ideal diode, c- Deviation from ideality, d- Zener diodes, e- Narrow-based diodes
5- P-N junctions capacitance
a- Depletion capacitance, b-Diffusion capacitance

 II- MOS capacitor (NOTES)
1- Structure and Principle of Operations
a- Unbiased junction, b- Biased junction
2- Accumulation
3- Depletion
4- Inversion
5- Charges in the MOS structure
6- Threshold Voltage


III- MOSFET (NOTES)
1- Introduction
a- The role of the gate electrode, b- The role of the Drain electrode, c- MOSFET operations
2- MOSFET analysis
a- The linear model, b- The quadratic model, c- The bulk charge model, d- Conductance and Transconductance
3- Subthreshold current