Exam questions







PHT.301 Physics of Semiconductor Devices

Electrons in crystals

Intrinsic Semiconductors

Extrinsic Semiconductors

Bipolar transistors

Opto-electronics

Exam questions

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Electrons in crystals Calculate the Fermi energy - Exam April 2008 The hkl plane The distance between nearest neighbor atoms Arrangement of atoms on the surface of a crystal Silicon 100 surface Exam January 2010	Electron microscope Wavelengths The probability that an electron state is occupied The Fermi energy of a metal Average electron energy in a metal
Bandstructure of semiconductors Effective mass - Exam October 2011 Hole concentration in intrinsic silicon ≈ Exam April 2008 Fermi energies in intrinsic semiconductors ≈ Exam May 2011 Band structure - Exam March 2007 Electron bands - Exam April 2009	Band structure - Exam July 2012 Band structure - Exam March 2012 Effective mass Conduction band electron energy Band structure - Exam February 2009 Band structure - Exam January 2012 Metal, insulator, semiconductor - Exam April 2012
Doped semiconductors Exponential doping - Exam January 2011 Doping - Exam October 2011 Temperature dependence of silicon - Exam January 2010 Dopant separation Carriers in a doped semiconductor Carrier generation Ionized donors	Temperature dependence of a doped semiconductor
Carrier transport Conductivity of doped silicon Carrier drift Diffusion current Diffusion current - Exam July 2010 Minority carrier generation by light Haynes-Shockley experiment ≈ Exam - February 2009 Impact ionization Impurity scattering Hall effect Sze problem 2.11 MIT 6.012, problem 1.3	Mobility - Exam July 2012
p-n junctions pn junction, Exam April 2010 Maximum field strength in a pn junction Capacitance - Voltage Characteristics pn junction - Exam March 2007 A silicon pn junction - Exam October 2011 Diode current Capacitance of a pn junction - Exam February 2009 ≈ Varactor - Exam January 2012	pn junction Depletion width in reverse bias Sze problem 4.4
Metal-semiconductor contacts Ohmic contacts - Exam April 2008 Schottky diode - Exam January 2011 Schottky diode Schottky diode / p⁺n diode Diffusion, Drift, Tunneling, Thermionic emission - Exam April 2010 Schottky contact - Exam October 2011	Sze problem 7.1 Sze problem 7.4 Sze problem 7.6 Current mechanisms - Exam January 2012
JFETs/MESFETs/MODFETs Exam March 2007, problem 3 JFET pinch-off voltage p-channel MESFET - Exam January 2011 FET noise How does a JFET work? How does a MODFET work?	MESFET - Exam April 2012
MOS devices MOS capacitor Flatband voltage MOS capacitor - Exam May 2011 MOSFET terminology - Exam April 2008 Sze problems 6.1 - 6.4, Exam February 24, 2009, Exam April 2009 Subthreshold current - Exam April 2009 How does a MOSFET work? Memories - Exam May 2011	MOSFET - Exam July 2012 MOS capacitor - Exam July 2010 Depletion width in a MOS capacitor MOSFET - Exam April 2012
Bipolar transistors Minority charge distribution in a BJT pnp transistor in the reverse active mode - Exam January 2010 Common base configuration - Exam March 2007 How does a bipolar transistor work? Ebers-Moll model - Exam July 2010 Thyristor - Exam March 2012 How does a heterojunction bipolar transistor work?	Bipolar transistor - Exam July 2012 pnp transistor Sze problems 5.3, 5.4, and 5.5 Bipolar transistors - Exam April 2012
Optoelectronics Light emitting diode - Exam January 2011 Semiconductor laser diode - Exam July 2010 Optical communications - Exam May 2011 How does a light emitting diode work? How does a solar cell work? -Exam January 2012

Exams
2017: 3 March 2017, 30 June 2017, 30 November 2017
2016: 29 January 2016, 29 February 2016, 11 April 2016, 30 June 2016, 7 October 2016, 25 November 2016
2015: 6 March 2015, 24 April 2015, 3 July 2015, 9 October 2015, 4 December 2015
2014: 9 May 2014, 2 July 2014, 3 October 2014, 5 December 2014