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Low voltage Zener diode

  1. Oct 15, 2015 #1
    Hello
    I must complete my research before Saturday...
    my problem is: how can we fabricate a zener diode with lower than 5.6v zener voltage?
    a curve in my reference book determine how much doping need to manufacture desirable zener voltage. but the minimum voltage we can achieve is about 2.5v in silicon.
    how can we fabricate a zener diode with 1v breakdown??
    http://s6.picofile.com/file/8217451034/Untitled.jpg
     
  2. jcsd
  3. Oct 15, 2015 #2

    berkeman

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    Staff: Mentor

    Welcome to the PF.

    Just use an NPN transistor with a Vbe multiplier...
     
  4. Oct 15, 2015 #3
    My question was about manufacture a semiconductor! Not about a circuit!
     
  5. Oct 16, 2015 #4
  6. Oct 16, 2015 #5

    Baluncore

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    Given that information you cannot. So you must make a component that has the same characteristic as a 1V zenner.
    That device is a BJT with a forward biassed diode connected between the base and collector.
    Alternatively look at a band gap voltage references. https://en.wikipedia.org/wiki/Bandgap_voltage_reference
     
  7. Oct 18, 2015 #6
    Thaks for your answer
    I can't say "perhaps" to Perofessor!
    With Germanium in high doping impurity can achive 2v zener breakdown.
    Please help me to find the material and impurity to fabricate a 1v zener diode...
     
  8. Oct 18, 2015 #7

    meBigGuy

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    I wonder what this means (from http://www.microsemi.com/product-directory/zener-diodes/3385-low-voltage-ultra-sharp-knee ):

    "This multi-layer pn junction Zener design for ultra-sharp knee characteristics is used for low-voltage regulation and very low leakage currents. The new design offers significantly improved voltage regulation and lower dynamic impedance and capacitance compared to conventional Zeners".

    ? http://www.google.com/patents/US5677562
    ? http://www.researchgate.net/publication/3397509_New_technique_for_fabrication_of_low_voltage_Si_Zener_diodes [Broken]

    Hopefully the OP will get back with the answer
     
    Last edited by a moderator: May 7, 2017
  9. Oct 18, 2015 #8

    Baluncore

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    Why must it be a Zenner ? What is the application ? Will you use it as a clamp to prevent over-voltage ?

    A Si Zenner has minimum temp-co near 6V. If you want a voltage reference, then for 1.0V, you are better using a bandgap.
     
  10. Oct 18, 2015 #9

    meBigGuy

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    I think this is like homework. How does one create low voltage zeners.
     
  11. Oct 19, 2015 #10

    berkeman

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    I agree. Poster receives an infraction, and is advised to post in the Homework Help forums, and to show their work.
     
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