Allis, W. P.

Brown, S. C.

Harvey, George G.

Newburgh, R. G.

Thomas, J. B.

Tisza, Laszlo

DSpace@MIT

III. SOLID STATE PHYSICSProf. W. P. AllisProf. S. C. BrownProf. G. G. HarveyProf. L. TiszaR. G. NewburghJ. B. ThomasA. ELECTRICAL BREAKDOWN IN GERMANIUM AT MICROWAVE FREQUENCIESMeasurements of electrical breakdown in germanium are being continued on samplesthat have different impurity concentrations. Figure III-1 is a typical curve that showsthe variation in conductivity as the electric field is changed.An attempt is being made to correlate a theory with the experimental data. A dis-tribution function of the density of electrons as a function of energy is being derived onthe basis of the Boltzmann transport equation, which includes ionization and volumerecombination as the only inelastic processes that occur. Then the equilibrium numberof electrons will be determined by the condition that the ionization rate of neutralimpurities equals the recombination rate of electrons.J. B. Thomas0.0090.0080.0070.0060.0050.0040.0030.0020.001T = 4.2°KCONDUCTIVITYAT ROOMTEMPERATURE0.45 (OHM-CM)I I I I 13.0 4.0 5.0E(VOLTS/CM)6.0 7.0Variation in conductivity ofFig. III-1n-type germanium with change in electric field.-13-1-b

Solid State Physics

http://dspace.mit.edu/bitstream/1721.1/51268/1/RLE_QPR_037_III.pdf

Solid State Physics

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