Methods and systems for determining a critical dimension and overlay of a specimen
Methods and systems for monitoring semiconductor fabrication processes are provided. A system may include a stage configured to support a specimen and coupled to a measurement device. The measurement device may include an illumination system and a detection system. The illumination system and the detection system may be configured such that the system may be configured to determine multiple properties of the specimen. For example, the system may be configured to determine multiple properties of a specimen including: but not limited to, critical dimension and overlay misregistration; defects and thin film characteristics; critical dimension and defects; critical dimension and thin film characteristics; critical dimension, thin film characteristics and defects; macro defects and micro defects; flatness, thin film characteristics and defects; overlay misregistration and flatness; an implant characteristic and defects; and adhesion and thickness. In this manner, a measurement device may perform multiple optical and/or non-optical metrology and/or inspection techniques.
1. A system configured to determine at least two properties of a specimen, comprising:
a measurement device coupled to a stage configured to support the specimen, wherein the measurement device is configured as a spectroscopic scatterometer and a spectroscopic ellipsometer;
wherein the spectroscopic scatterometer is configured to direct light toward repeatable pattern features on a surface of the specimen, wherein the spectroscopic scatterometer comprises a spectrometer configured to measure diffraction order intensities of different wavelengths of light diffracted from the repeatable pattern features, and wherein the diffraction order intensities comprise diffraction order intensities higher than the zeroth diffraction order intensity; and
a processor coupled to the spectroscopic spectrometer and the spectroscopic ellipsometer and configured to determine at least a first property of the repeatable pattern features using output of the spectrometer responsive to the measured diffraction order intensities and to determine overlay misregistration of the specimen using the output of the spectrometer or output of the spectroscopic ellipsometer, wherein the at least the first property comprises a grating shape parameter of the repeatable pattern features.
2. The system of claim 1 , wherein the at least the first property of the repeatable pattern features further comprises a period, a width, a step height, a sidewall angle, a thickness of underlying layers, and a profile of the features on the specimen.
3. The system of claim 1 , wherein the measured diffraction order intensities further comprise the zeroth diffraction order intensity.
4. The system of claim 1 , wherein the spectroscopic scatterometer is further configured as an x-ray measurement device, and wherein the at least the first property of the repeatable pattern features further comprises a composition of material of the repeatable pattern features.
5. The system of claim 1 , wherein the spectroscopic scatterometer is further configured as an x-ray measurement device and is further configured to direct the light toward an unpatterned thin film on a surface of a specimen, wherein the processor is further configured to determine a property of the unpatterned thin film using the output of the spectroscopic spectrometer responsive to the measured diffraction order intensities, and wherein the property of the unpatterned thin film comprises a composition of material of the unpatterned thin film.
6. The system of claim 1 , wherein the spectroscopic scatterometer is further configured to direct the light toward an unpatterned thin film on a surface of a specimen, and wherein the processor is further configured to determine a property of the unpatterned thin film using the output of the spectroscopic spectrometer responsive to the measured diffraction order intensities.
7. A system configured to determine at least two properties of a specimen, comprising:
a stage configured to support the specimen;
a first measurement device coupled to the stage and configured as an optical, measurement device, wherein the first measurement device is further configured to direct light toward a surface of the specimen, to detect light propagating from the surface of the specimen, and to generate output responsive to the detected light, and wherein the first measurement device is further configured as a spectroscopic scatterometer and a spectroscopic ellipsometer:
a second measurement device coupled to the stage and configured as an x-ray measurement device, wherein the second measurement device is further configured to direct x-rays toward the surface of the specimen, to detect energy propagating from the surface of the specimen, and to generate output responsive to the detected energy; and
a processor coupled to the first and second measurement devices and configured to determine a first property and a second property of the specimen using the output of the first and second measurement devices, wherein the first property comprises a critical dimension of the specimen, wherein the second property comprises a thin film property of the specimen, wherein the specimen comprises at least one diffracting structure and one or more films underneath the at least one diffracting structure, and wherein the processor is further configured to determine at least a grating shape parameter of the at least one diffracting structure and overlay misregistration of the specimen from the output generated by the first measurement device.
8. The system of claim 7 , wherein the second measurement device is further configured as an X-ray reflectometer, an X-ray fluorescence device, a grazing X-ray reflectometer, or an X-ray diffractometer.