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Programme & Unit Catalogues

## PH20015: Semiconductor physics

Owning Department/School: Department of Physics
Credits: 3
Level: Intermediate (FHEQ level 5)
Period: Semester 2
Assessment: EX 100%
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
Description: Aims:
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.

Learning Outcomes:
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.

Skills:
Numeracy T/F A, Problem Solving T/F A.

Content:
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.
Programme availability:

#### PH20015 is Compulsory on the following programmes:

Department of Physics
• USPH-AFB01 : BSc (hons) Physics (Full-time) - Year 2
• USPH-AFB05 : BSc (hons) Physics with Computing (Full-time) - Year 2
• USPH-AKB06 : BSc (hons) Physics with Computing (with Placement) (Full-time with Thick Sandwich Placement) - Year 2
• USPH-AAB06 : BSc (hons) Physics with Computing with Year Abroad (Full-time with Study Year Abroad) - Year 2
• USPH-AKB02 : BSc (hons) Physics (with Placement) (Full-time with Thick Sandwich Placement) - Year 2
• USPH-AAB02 : BSc (hons) Physics with Year Abroad (Full-time with Study Year Abroad) - Year 2
• USPH-AFM02 : MPhys Physics (Full-time) - Year 2
• USPH-AFM04 : MPhys Physics with Research Placement (Full-time) - Year 2
• USPH-AAM03 : MPhys Physics with Year Abroad (Full-time with Study Year Abroad) - Year 2

#### PH20015 is Optional on the following programmes:

Department of Physics
• USPH-AFB09 : BSc Physics (Full-time) - Year 3
• USPH-AKB09 : BSc Physics (with Placement) (Full-time with Thick Sandwich Placement) - Year 4

Notes:
* This unit catalogue is applicable for the 2012/13 academic year only. Students continuing their studies into 2013/14 and beyond should not assume that this unit will be available in future years in the format displayed here for 2012/13.
* Programmes and units are subject to change at any time, in accordance with normal University procedures.
* Availability of units will be subject to constraints such as staff availability, minimum and maximum group sizes, and timetabling factors as well as a student's ability to meet any pre-requisite rules.