Intrinsic Concentrations are different in some books. Why?

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SUMMARY

The discussion centers on the discrepancies in intrinsic carrier concentration values for silicon (Si) found in various literature, specifically noting values of 1.1×1010 cm−3 and 1.5×1010 cm−3. A key reference is the paper by A. B. Sproul, M. A. Green, and J. Zhao, which presents a revised intrinsic carrier concentration of 1.01×1010 cm−3 at 300 K, suggesting that previous values may be inconsistent with experimental data. The discussion highlights the importance of accurate measurements in semiconductor physics.

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Homework Statement
Solid State Physics
Relevant Equations
Intrinsic Concentration
instinct concentration temperature relationship formula?
in some books, Si instrinct concentration(ni)=1,1x10^10cm-3, some books instrinct concentration(ni)=1,5x10^10cm-3. Why these values are different?
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Maybe, this paper might be of help:
A. B. Sproul, M. A. Green, and J. Zhao, Improved value for the silicon intrinsic carrier concentration at 300 K , Appl. Phys. Lett. 57, 255 (1990)

Abstract

A recent review suggests that the commonly cited value of 1.45×1010 cm−3 for the silicon intrinsic carrier concentration at 300 K is inconsistent with the best experimental and theoretical results. An alternative value of 1.08×1010 cm−3 was suggested. A new experimental measurement of 1.01×1010 cm−3 is reported with an estimated one standard deviation uncertainty of only 3%. This appears to be the most accurate experimental determination of this parameter at any temperature.
 

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