Three-dimensional shape measuring unit, processing unit, and semiconductor device manufacturing method
A semiconductor device manufacturing technique measures simultaneously a plurality of points on a sample to realize a high-speed three-dimensional shape measurement and reflects it to setting of a processing condition in a semiconductor device process, thereby making it possible to realize stable device manufacture with high precision. A three-dimensional shape measuring apparatus loaded on a processing apparatus such as an etcher, a coater-developer, a baking machine, or a lithography machine measures a plurality of points ( 500 ) on a sample ( 300 ) at high speed by arranging a plurality of measurement heads ( 100 ) for measuring a three-dimensional shape of the sample and by combining it with movement of an loader/stage ( 200 ) loading the sample ( 300 ). By using this measurement result, feeding back for correcting a processing condition with respect to the subsequent sample ( 300 ) and feeding forward for correcting a processing condition in the next step are realized.
1. A three-dimensional shape measuring apparatus comprising:
a measurement head for measuring a three-dimensional shape of a sample;
a stage holding the sample thereon; and
a relative position measurer using at least one of electrostatic capacity, air pressure, and light to measure a relative position between the sample and the measurement head,
wherein the relative position measurer includes at least two measurement members disposed so as to sandwich the measurement head therebetween; and
wherein while the measurement head measures the three-dimensional shape of the sample, the relative position measurer obtains a weighted average of outputs of the at least two measurement members so as to acquire a change in the relative position between the sample and the measurement head, the sample being disposed at a position to be measured by the measurement head.
2. The three-dimensional shape measuring apparatus according to claim 1 ,
wherein the measurement head uses at least one of:
(1) a method of irradiating light on the sample, measuring at least one of an angle distribution or wavelength distribution of scattered light, and thereby measuring a three-dimensional shape of the sample in an irradiated area of the light;
(2) a method of making a probe contact with the sample and measuring a three-dimensional shape of the sample by making the probe and the sample relatively scanned;
(3) a method of irradiating a charged particle beam onto the sample, detecting a secondary electron or reflected electron from the sample, and thereby measuring a three-dimensional shape of the sample;
(4) a method of irradiating a charged particle beam onto the sample, changing an angle of irradiation of the charged particle beam to form a plurality of images, and measuring a three-dimensional shape of the sample from a positional relation between the plurality of images acquired;
(5) a method of irradiating a charged particle beam onto the sample, detecting a hologram image of the charged particle beam, and measuring a three-dimensional shape of the sample;
(6) a method of using a change in a light intensity or a level of sharpness due to a variation of a focus position of an light image under a microscope to measure a three-dimensional shape of the sample;
(7) a method of interfering detection light and reference light under a microscope to measure a three-dimensional shape of the sample; and
(8) a method of irradiating a laser beam onto the sample under a microscope, scanning the laser beam, and thereby measuring a three-dimensional shape of the sample.
3. The three-dimensional shape measuring apparatus according to claim 1 ,
wherein information on the relative position obtained by the relative position measurer is used to control a position of at least one of the measurement head and the stage.
4. The three-dimensional shape measuring apparatus according to claim 1 ,
wherein the relative position measurer is used to record a change in the relative position between the measurement head and the sample, and information on the recorded change is used to correct a measurement result of the three-dimensional shape of the sample obtained by the measurement head.