Concentration of minority carriers in a pn junction

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SUMMARY

The discussion focuses on calculating the majority and minority carrier concentrations in a semiconductor p-n junction with doping concentrations of Na=1E18 cm-3 and Nd=1E16 cm-3, and intrinsic carrier concentration ni=1.18E10 cm-3 at T=300K. The calculations yield minority carrier concentrations of npo=139.24 cm-3 and pno=13924 cm-3. The results are confirmed through Google searches, affirming the correctness of the setup despite the low values, which are expected for minority carriers.

PREREQUISITES
  • Understanding of semiconductor physics, specifically p-n junctions
  • Familiarity with carrier concentration equations in semiconductors
  • Knowledge of intrinsic carrier concentration (ni) and its significance
  • Basic proficiency in using scientific calculators or computational tools for verification
NEXT STEPS
  • Study the effects of temperature on carrier concentrations in semiconductors
  • Learn about the impact of varying doping concentrations on p-n junction behavior
  • Explore advanced semiconductor models, such as the Shockley diode equation
  • Investigate the role of minority carriers in electronic device performance
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Students and professionals in electrical engineering, semiconductor physics, and anyone involved in the design and analysis of electronic devices utilizing p-n junctions.

jeffy
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Homework Statement




A semiconductor p-n junction is fabricated where the doping concentration on the p and n sides of the junction is Na=1E18cm^-3 and Nd=1E16cm^-3 respectively. Given that ni=1.18E10cm^-3, T=300k calculate:

a) The majority and minority carrier concentrations in the neutral bulk regions on either side of the junction.

Homework Equations


ni^2=(npo)(Na) and ni^2=(Pno)Nd
where npo is the concentration of electrons in the p doped region and pno is the concentration of holes in the n region

The Attempt at a Solution


using the above equations i got npo=139.24 cm^-3 and 13924cm^-3 for the minority concentrations. I want to ask if i did this right because i think these concentrations are kinda low


thanks for reading
 
Physics news on Phys.org
ya but is the set up correct, because 139.24cm^-3 is low comaring to 1.18E18cm^-3, but then again they are minority carriers
 

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