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I have a plot log (I) = f(U) for a few diodes: Silicon diode, Germanium diode, some LED and a Zener diode. I need to determine the material, from which the Zener diode is made based on the positioning of its characteristics. What parameter should I look for to determine it? I thought about checking the band gap somehow, but I am not sure whether it can be determined by just having a plot log(I) = f(U).

And if I know the difference between voltages (for specified current) of two diodes , let's call them A and B, and I have some information about diode A (including its band gap), can I calculate the band gap of the B diode?

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  • \$\begingroup\$ The material is Silicon not silicone \$\endgroup\$ Nov 18 '13 at 16:30
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I'm not sure if I understand your problem, but if you want to determine which of the four types of diodes you have you can look at the forward voltage (V_f) and reverse voltage when diode starts to conduct at reverse polarity (V_r) and maybe reverse leakage current (I_rl) before that point:

  • Si-Diode: V_f ca. 0.6 V, large V_r, low Irl
  • Ge-Diode: V_f ca. 0.3V, relative large I_rl
  • LED: relative large V_f (> 1V, e.g. 1.4 V, depending on material)
  • Si-Zener-Diode: V_f ca. 0.6V, V_r = V_zener
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  • \$\begingroup\$ Would Germanium Zener Diode have V_f ca. 0.3 V or have I misunderstood your answer? \$\endgroup\$
    – 3yakuya
    Nov 20 '13 at 0:16
  • \$\begingroup\$ @Byakuya: Yes, I guess a Ge Zener-diode would have V_f ca. 0.3V. I have, however, never ever met a Ge-Zener diode (or a Zener diode made of anything else but Si). \$\endgroup\$
    – Curd
    Nov 29 '13 at 10:18

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