MIT6_012F09_lec01

MIT6_012F09_lec01 - 6.012 - Electronic Devices and Circuits...

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6.012 - Electronic Devices and Circuits Lecture 1 - Introduction to Semiconductors - Outline Introductions/Announcements Handouts: 1. General information, reading assignments (4 pages) 2. Syllabus 3. Student info sheet (for tutorials, do/due in recitation tomorrow!) 4. Diagnostic exam (try it on-line) 5. Lecture 1 Rules and regulations (next foil) Why semiconductors, devices, circuits? Mobile charge carriers in semiconductors Crystal structures, bonding Mobile holes and electrons Dopants and doping Silicon in thermal equilibrium Generation/recombination; n o p o product n o , p o given N d , N a ; n- and p-types Drift Mobility Conductivity and resistivity Resistors (our first device) Clif Fonstad, 9/10/09 Lecture 1 - Slide 1
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Comments/Rules and expectations Recitations: They re-enforce lecture. They present new material. They are very important. Tutorials: They begin Monday, September 14. Assignments will be posted on website. Homework: Very important for learning; do it!! Cheating: What you turn in must be your own work. While it is OK to discuss problems with others, you should work alone when preparing your solution. Reading assignment (Lec. 1) Chapter 1 in text* Chapter 2 in text * "Microelectronic Devices and Circuits" by Clifton Fonstad http://dspace.mit.edu/handle/1721.1/34219 Clif Fonstad, 9/10/09 Lecture 1 - Slide 2
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SEMICONDUCTORS: Here, there, and everywhere! Computers, PDAs, laptops, Silicon (Si) MOSFETs, Integrated Circuits (ICs), anything “intelligent” CMOS, RAM, DRAM, flash memory cells Cell phones, pagers, WiFi Si ICs, GaAs FETs, BJTs CD players, iPods AlGaAs and InGaP laser diodes, Si photodiodes TV remotes, mobile terminals Light emitting diodes Satellite dishes InGaAs MMICs Optical fiber networks InGaAsP laser diodes, pin photodiodes Traffic signals, car GaN LEDs ( green , blue ) taillights, dashboards InGaAsP LEDs ( red , amber ) Air bags Si MEMs, Si ICs They are very important, especially to EECS types!! They also provide: a good intellectual framework and foundation, and a good vehicle and context with which to learn about modeling physical processes, and to begin to understand electronic circuit analysis and design. Clif Fonstad, 9/10/09 Lecture 1 - Slide 3
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Silicon: our default example and our main focus Atomic no. 14 14 electrons in three shells: 2 ) 8 ) 4 i.e., 4 electrons in the outer "bonding" shell Silicon forms strong covalent bonds with 4 neighbors Si bonding configuration Silicon crystal ("diamond" lattice) Figure by MIT OpenCourseWare. Silicon crystal ("diamond" lattice) Clif Fonstad, 9/10/09 Lecture 1 - Slide 4
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Intrinsic silicon - pure, perfect, R.T.: Electron • All bonds filled at 0 K, p o = n o = 0 energy Si - + Conducting states E g E 1.1 eV g Bonding states • At R. T., p o = n o = n i = 10 10 cm -3 Density of electron energy states • Mobile holes (+) and mobile electrons (-) • Compare to 5 x 10 22 Si atoms/cm 3 Clif Fonstad, 9/10/09 Lecture 1 - Slide 5
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MIT6_012F09_lec01 - 6.012 - Electronic Devices and Circuits...

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