Noncontact evaluation for interface states by photocarrier counting

Abstract

We have developed a noncontact measurement method that enables in-line measurement and does not have any test element group (TEG) formation. In this method, the number of photocarriers excited from the interface states are counted which is called "photocarrier counting", and then the energy distribution of the interface states density (D it ) is evaluated by spectral light excitation. In our previous experiment, the method used was a preliminary contact measurement method at the oxide on top of the Si wafer. We developed, at this time, a D it measurement method as a noncontact measurement with a gap between the probes and the wafer. The shallow trench isolation (STI) sidewall has more localized interface states than the region under the gate electrode. We demonstrate the noncontact measurement of trapped carriers from interface states using wafers of three different crystal plane orientations. The demonstration will pave the way for evaluating STI sidewall interface states in future studies.

PDC: Pearl Detection with a Counter Based on Deep Learning

“…Automatic counting systems [1,2] for pearls reduce the human working time significantly, compared with traditional manual counting methods. A noncontact counting system for pearls is recommended to achieve clean and precise measurements [3]. In general, the computer vision-based noncontact counting system consists of two stages, object detection [4], and object counting [5].…”

“…The detection of pearl precision is the ratio of relevant examples (true positives) among all the examples, which are defined by the following equation: true positives precision= true positives+false positives(3) On the other hand, the recall is the ratio of examples, which implicates how well we find positives.…”