ch02 - Fundamentals of Microelectronics CH1 CH2 CH3 CH4 CH5...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Fundamentals of Microelectronics CH1 Why Microelectronics? CH2 Basic Physics of Semiconductors CH3 Diode Circuits CH4 Physics of Bipolar Transistors CH5 Bipolar Amplifiers CH6 Physics of MOS Transistors CH7 CMOS Amplifiers CH8 Operational Amplifier As A Black Box
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Chapter 2 Basic Physics of Semiconductors 2.1 Semiconductor materials and their properties 2.2 PN-junction diodes 2.3 Reverse Breakdown
Background image of page 2
CH2 Basic Physics of Semiconductors 3 Semiconductor Physics Semiconductor devices serve as heart of microelectronics. PN junction is the most fundamental semiconductor device.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CH2 Basic Physics of Semiconductors 4 Charge Carriers in Semiconductor To understand PN junction’s IV characteristics, it is important to understand charge carriers’ behavior in solids, how to modify carrier densities, and different mechanisms of charge flow.
Background image of page 4
CH2 Basic Physics of Semiconductors 5 Periodic Table This abridged table contains elements with three to five valence electrons, with Si being the most important.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CH2 Basic Physics of Semiconductors 6 Silicon Si has four valence electrons. Therefore, it can form covalent bonds with four of its neighbors. When temperature goes up, electrons in the covalent bond can become free.
Background image of page 6
CH2 Basic Physics of Semiconductors 7 Electron-Hole Pair Interaction With free electrons breaking off covalent bonds, holes are generated. Holes can be filled by absorbing other free electrons, so effectively there is a flow of charge carriers.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CH2 Basic Physics of Semiconductors 8 Free Electron Density at a Given Temperature E g , or bandgap energy determines how much effort is needed to break off an electron from its covalent bond. There exists an exponential relationship between the free- electron density and bandgap energy. 3 15 0 3 10 0 3 2 / 3 15 / 10 54 . 1 ) 600 ( / 10 08 . 1 ) 300 ( / 2 exp 10 2 . 5 cm electrons K T n cm electrons K T n cm electrons kT E T n i i g i × = = × = = - × =
Background image of page 8
CH2 Basic Physics of Semiconductors 9 Doping (N type) Pure Si can be doped with other elements to change its electrical properties. For example, if Si is doped with P (phosphorous), then it has more electrons, or becomes type N (electron).
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CH2 Basic Physics of Semiconductors 10 Doping (P type) If Si is doped with B (boron), then it has more holes, or becomes type P.
Background image of page 10
CH2 Basic Physics of Semiconductors 11 Summary of Charge Carriers
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Basic Physics of Semiconductors 12 Electron and Hole Densities The product of electron and hole densities is ALWAYS equal to the square of intrinsic electron density regardless of doping levels. 2
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/05/2010 for the course EE EE taught by Professor Ee during the Spring '10 term at Korea Advanced Institute of Science and Technology.

Page1 / 42

ch02 - Fundamentals of Microelectronics CH1 CH2 CH3 CH4 CH5...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online