Wafer metrology technologies
First Claim
Patent Images
1. A system for optically interrogating a surface, comprisinga pump optical source configured to emit pumping radiation, the pumping radiation having an average optical pump power;
- a probe optical source configured to emit probing radiation, the probing radiation having an average optical probe power less than the average optical pump power;
at least one optical detector configured to detect second harmonic generated light generated by at least one of the pumping radiation or the probing radiation, the second harmonic generated light being generated by a semiconductor wafer whose surface is to be interrogated;
at least one of a shutter, a modulator or a variable optical path that is configured to introduce a variable time offset between the pumping and the probing radiation; and
a processor configured to determine a characteristic of the detected second harmonic generated light,wherein the system is configured to obtain a time dependence of the detected second harmonic generated light in less than 10 seconds after applying at least one of the pumping radiation and the probing radiation.
3 Assignments
0 Petitions
Accused Products
Abstract
Various approaches can be used to interrogate a surface such as a surface of a layered semiconductor structure on a semiconductor wafer. Certain approaches employ Second Harmonic Generation and in some cases may utilize pump and probe radiation. Other approaches involve determining current flow from a sample illuminated with radiation. Decay constants can be measured to provide information regarding the sample. Additionally, electric and/or magnetic field biases can be applied to the sample to provide additional information.
78 Citations
32 Claims
-
1. A system for optically interrogating a surface, comprising
a pump optical source configured to emit pumping radiation, the pumping radiation having an average optical pump power; -
a probe optical source configured to emit probing radiation, the probing radiation having an average optical probe power less than the average optical pump power; at least one optical detector configured to detect second harmonic generated light generated by at least one of the pumping radiation or the probing radiation, the second harmonic generated light being generated by a semiconductor wafer whose surface is to be interrogated; at least one of a shutter, a modulator or a variable optical path that is configured to introduce a variable time offset between the pumping and the probing radiation; and a processor configured to determine a characteristic of the detected second harmonic generated light, wherein the system is configured to obtain a time dependence of the detected second harmonic generated light in less than 10 seconds after applying at least one of the pumping radiation and the probing radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A system for optically interrogating a surface, comprising:
-
a pump optical source configured to emit pumping radiation, the pumping radiation having an average optical pump power; a probe optical source configured to emit probing radiation, the probing radiation having an average optical probe power less than the average optical pump power; at least one optical detector configured to detect second harmonic generated light generated by at least one of the pumping radiation or the probing radiation, the second harmonic generated light being generated by a semiconductor wafer whose surface is to be interrogated; and a controller configured to obtain information regarding time dependence of the detected second harmonic generated light produced in less than 10 seconds after applying at least one of the pumping radiation and the probing radiation. - View Dependent Claims (25, 26, 27)
-
-
28. A system for optically interrogating a surface, comprising
a pump optical source configured to emit pumping radiation with variable energy, the pumping radiation having an average optical pump power; -
a probe optical source configured to emit probing radiation, the probing radiation having an average optical probe power less than the average optical pump power; an optical detector configured to detect second harmonic generated light generated by at least one of the pumping radiation or the probing radiation, the second harmonic generated light being generated by a semiconductor wafer whose surface is to be interrogated; and processing electronics configured to; obtain information regarding time dependence of the detected second harmonic generated light generated less than 10 seconds after applying at least one of the pumping radiation and the probing radiation; and detect a region of discontinuity in the second harmonic generated light to determine threshold injection carrier energy as the energy of the pumping radiation is varied. - View Dependent Claims (29, 30, 31, 32)
-
Specification