semiconductor physics review – bonds, bands
TRANSCRIPT
.... energizing Ohio for the 21st Century
February 21, 2012The University of Toledo, Department of Physics and Astronomy
SSARE, PVIC
Principles and Varieties of Solar Energy (PHYS 4400)and
Fundamentals of Solar Cells (PHYS 6980)
SEMICONDUCTOR PHYSICS REVIEW –
BONDS, BANDS, EFFECTIVE MASS
.... energizing Ohio for the 21st Century
On today’s menu
• Review of semiconductor physics‐ bonds and bands in crystals‐ electrons and holes‐ valence/conduction bands, ‐HOMO‐LUMO concepts
• drift and diffusion• photogenerated carriers‐Absorption coefficient, depth dependence‐ direct vs. indirect gap
• recombination mechanisms
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
LUMO
HOMO
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st Centuryhttp://www.haverford.edu/physics/songs/livingston/energybandslecture.pdf
Charge carriers increasingly “feel” the crystal potential
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
At the Brillouin boundary
Transport and Nearly‐Free‐Electron Model
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
cosine
sine
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st Centuryhttp://www.mse.ncsu.edu/WideBandgaps/classes/MSE%20704/Handouts/BZs&Bands.pdf
.... energizing Ohio for the 21st Centuryhttp://www.mse.ncsu.edu/WideBandgaps/classes/MSE%20704/Handouts/BZs&Bands.pdf
.... energizing Ohio for the 21st Centuryhttp://www.mse.ncsu.edu/WideBandgaps/classes/MSE%20704/Handouts/BZs&Bands.pdf
.... energizing Ohio for the 21st Centuryhttp://www.mse.ncsu.edu/WideBandgaps/classes/MSE%20704/Handouts/BZs&Bands.pdf
Indirect Gap
.... energizing Ohio for the 21st Centuryhttp://www.mse.ncsu.edu/WideBandgaps/classes/MSE%20704/Handouts/BZs&Bands.pdf
Direct Gap
.... energizing Ohio for the 21st Centuryhttp://www.mse.ncsu.edu/WideBandgaps/classes/MSE%20704/Handouts/BZs&Bands.pdf
.... energizing Ohio for the 21st Centuryhttp://www.mse.ncsu.edu/WideBandgaps/classes/MSE%20704/Handouts/BZs&Bands.pdf
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT
.... energizing Ohio for the 21st CenturyFrom Semiconductors I, by R.W. Collins, UT