home - svbmt protagoras · 2018-01-22 · exercise 9: ee/au a. the type of doping that was applied...

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Exercise9:EE/AU

a. Thetypeofdopingthatwasappliedisp-typeoracceptordoping,sinceitallowsforan

electroninthevalencebandtojumpintotheenergylevelofthedoping,thuscreatingahole

inthevalenceband.Thechargetransportisthereforedominatedbyholes.

b. Attemperaturesabove0Kelvin,theFermi-Diracdistributiontellsusthatelectronsexist

withanenergylevelbeyondtheFermilevel.TheFermilevelisatthetopofthevalence

band,sincethevalencebandisfullat0Kelvinandthereisnoconduction(isolator).An

electronwithhigherenergythantheFermilevelcanjumptothedopingenergyleveland

getstrappedthereatafixedpositioninthematerial,atthepositionofanacceptoratom,

whileitleavesaholeinthevalenceband.Thisholeisnowavailableforchargetransport.

Answers

a. ; is pointing to the right; is pointing upward, and therefore should be pointing into the paper (since 0).

b. The protons gain an energy Δ Δ ⇒

The speed is not changed by the magnetic field

c. Cyclotron orbit: ⇒

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