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billano786
Joined: 26 Apr 2001
Posts: 396
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 30 Sep 2004 19:36 Boltzmann constant from diode characteristics |
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| Does any one know how to get Boltzmann constant from diode characteristics in lab??
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Fom
Joined: 10 Mar 2004
Posts: 731
Helped: 54
Location: Taiwan
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| 01 Oct 2004 15:24 Re: Boltzmann constant from diode characteristics |
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Vd=(kT/q)*ln(Id/Io) or Vd1-Vd2 = (kT/q)*(ln(Id1)-ln(Id2))
Plot IV curve of the diode. X axis is ln(Id). Y axis is Vd. Find slope of this plot where the plot is most linear. It will be equal kT/q. T - temperature in Kelvin, q is electron charge. So you can find k - Boltzman constant.
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flatulent
Joined: 19 Jul 2002
Posts: 4850
Helped: 285
Location: Middle Earth
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| 01 Oct 2004 17:14 Re: Boltzmann constant from diode characteristics |
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| When doing the above, plot the current over a very wide range and take your two points over the middle current range that avoids the effects of leakage current at low current values and high level injection effects at high currents.
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