|Owning Department/School:||Department of Physics|
|Level:||Intermediate (FHEQ level 5)|
|Supplementary Assessment:||PH20015 - Mandatory Extra Work (where allowed by programme regulations)|
|Requisites:||Before taking this unit you must take PH10007 and take PH10008 and take PH20029 and while taking this unit you must take PH20017|
The aims of this unit are to explore some of the physics underlying the behaviour of electrons in semiconductor materials and the operation of simple semiconductor devices.
After taking this unit the student should be able to:
* discuss the basic concepts of semiconductor physics;
* calculate carrier concentrations and effective masses;
* outline the basic principles of semiconductor device operation;
* describe the interactions between electrons and photons such as absorption, spontaneous emission and stimulated emission;
* give examples of common optoelectronic devices for emitting, detecting and modulating light, and explain their physical principles of operation.
Numeracy T/F A, Problem Solving T/F A.
Basic properties of semiconductors (4 hours): Electrons and holes and their effective masses. Extrinsic and intrinsic semiconductors; donors and acceptors. Electron and hole concentrations, semiconductor statistics.
Transport properties (2 hours): Electrical conduction and scattering of electrons and holes in solids. Drift velocity, resistivity, diffusion, electron-hole recombination, recombination length. The Hall effect.
The p-n junction (2 hours): The unbiased p-n junction; junction formation, depletion layer width. Biased p-n junctions; band profiles, depletion region width, junction capacitance. Balance of drift and diffusion currents. Qualitatitive introduction to the ideal diode equation, reverse bias breakdown.
Electron-photon interaction in semiconductors (3 hours): Optical absorption in bulk semiconductors; spectral dependence, photocurrent, P-I-N photodiodes. Optical emission in semiconductors; radiative and non-radiative transitions, light-emitting diodes.
PH20015 is Compulsory on the following programmes:Department of Physics
PH20015 is Optional on the following programmes:Department of Physics