. The Bell System technical journal . interest found in the present potential diagrams for n-type and p-type are drawn with the Fermilevels aligned, to show the relation between the property (F — In X) =const, and the frequently observed smallness of the contact potentialdifference between n and p-type germanium. As to the reproducibility and accuracy of the work presented here,the following points may be of interest: (i) The measurements were re-peated on another n-type sample of nearly the same resistivity as theone reported here, but cut from a different crystal. The results on
. The Bell System technical journal . interest found in the present potential diagrams for n-type and p-type are drawn with the Fermilevels aligned, to show the relation between the property (F — In X) =const, and the frequently observed smallness of the contact potentialdifference between n and p-type germanium. As to the reproducibility and accuracy of the work presented here,the following points may be of interest: (i) The measurements were re-peated on another n-type sample of nearly the same resistivity as theone reported here, but cut from a different crystal. The results on thissample were indistinguishable, within the experimental error, from thosefound on the first n-type sample, (ii) If the sample was re-etched in pre-cisely the same way as before, and the experiments repeated, the re-sults were in good agreement with those obtained before. However,variations in the etching procedure sometimes gave quite different re- X MAXIMUM IN S o ZERO OF dv/dcT □ INVERSION POINT p-TYPE SAMPLE n-TYPE SAMPLE. Fig. 10 — The shapes of the surface space-charge regions for the p-type and/i-type samples in the extremes of gaseous environment. The two surfaces are tothe center of the figure. The solid curves show the center of the gap (intrinsicFermi level) plotted against distance, in units of an intrinsic Debj-e length. Alsoshown are the positions of the zeros of (dY/dS), the maxima of s, and the minimaof surface conductivitj. 1040 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1956 suits. Wc hope to discuss this at a future date, (iii) The accuracy of themeasurements is not high. Some of the more directly-derivable quanti-ties, such as s, should be known to 5 per cent, but a quantitylike (d2s/d8)/(dZs/dY), which is only obtained after a long and elabo-rate calculation involving a number of corrections, is perhaps uncertainto 30 per cent. ^ VII. CONCLUSIONS This paper has presented results of combined measurements of fieldeffect, photoconductivity, change o
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