METHOD FOR MEASURING SURFACE AREA CHANGE RATIO OF POLYSILICON THIN FILM HAVING HEMISPHERICAL GRAIN, AND METHOD AND DEVICE FOR MEASURING CAPACITANCE USING THE SAME

PROBLEM TO BE SOLVED: To accurately acquire a surface area change ratio, by a method wherein a polysilicon thin film having a hemispherical grain is formed, and an area change ratio is calculated by measuring a height and a porosity of the hemispherical grain. SOLUTION: A polysilicon thin film havin...

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Hauptverfasser: SHIN SHIYOUYU, GO DOSEI, YANA KOUZEN, WOO SANG H, KAN ITSUKON
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GO DOSEI
YANA KOUZEN
WOO SANG H
KAN ITSUKON
description PROBLEM TO BE SOLVED: To accurately acquire a surface area change ratio, by a method wherein a polysilicon thin film having a hemispherical grain is formed, and an area change ratio is calculated by measuring a height and a porosity of the hemispherical grain. SOLUTION: A polysilicon thin film having a hemispherical grain is formed, and a height (t) and a porosity (fν) of the hemispherical grain of the polysilicon thin film are measured, and these are substituted for formula I to calculate an area change ratio CE. And, a thickness (d) of a dielectric film as a capacitor, a dielectric constant ( ) and an area change ratio CE are substituted for formula II, to calculate a capacitance change ratio Cr. Thus, prior to completion of the capacitor, a change of capacitance can accurately be known. Incidentally, the area change ratio is monitored near to an actual value at a stage of forming the hemispherical grain on a surface of the polysilicon thin film, whereby it is possible to enhance reliability and a manufacturing yield of the capacitor.
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subjects BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
PHYSICS
SEMICONDUCTOR DEVICES
TESTING
title METHOD FOR MEASURING SURFACE AREA CHANGE RATIO OF POLYSILICON THIN FILM HAVING HEMISPHERICAL GRAIN, AND METHOD AND DEVICE FOR MEASURING CAPACITANCE USING THE SAME
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