Russian Physics Journal

, Volume 41, Issue 11, pp 1103–1106 | Cite as

Approximate equations for space-charge limited currents

  • S. Ya. Belomyttsev
Physics of Semiconductors and Insulators


We derive approximate equations for space-charge limited currents for planar, cylindrical, and spherical diodes, and in transfer tubes. The accuracy of the equations for the planar diode is about 1% for all voltages considered. We conclude that these currents can be described by simple equations to within a few percent for a broad class of space-charge limited currents and for nearly all practical voltages.


Approximate Equation Radius Ratio Transfer Tube Current Density Beam Planar Diode 
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Copyright information

© Kluwer Academic/Plenum Publishers 1999

Authors and Affiliations

  • S. Ya. Belomyttsev

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