Patent ID: 8215175
Filing Date: 2012-07-10
Classification: G01N,H01L

Abstract:
1. A quantitative evaluation device for an atomic vacancy existing in a silicon wafer, comprising: a silicon sample formed with an ultrasonic generator and an ultrasonic receiver on a silicon wafer, a magnetic force generator for applying an external magnetic field to the said silicon sample, a cooler capable of cooling the said silicon sample to a range of temperatures lower than or equal to 50 k, a detector for detecting a phase difference between an ultrasonic pulse generated from the said ultrasonic generator and a measured wave pulse created by allowing the said ultrasonic pulse to propagate within the said silicon wafer to be received in the said ultrasonic receiver, wherein the said ultrasonic generator and the said ultrasonic receiver are each equipped with a transducer including: a thin film oscillator with a physical property capable of following an expanding action of a silicon wafer in association with a temperature drop in the said range of temperatures and is made up of a high-polymer material having the nature of generating orientations of molecular axes in any one of cases where the said thin film oscillator is solidified, where after being solidified, the said thin film oscillator is heated, and where after being solidified, the said thin film oscillator is heated and then is cooled; and electrodes for applying an electric field to the said thin film oscillator.