WO2006054496A1 - 同期精度検出方法およびシステム、収差検出方法およびシステム、ならびにコンピュータプログラム - Google Patents
同期精度検出方法およびシステム、収差検出方法およびシステム、ならびにコンピュータプログラム Download PDFInfo
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- WO2006054496A1 WO2006054496A1 PCT/JP2005/020740 JP2005020740W WO2006054496A1 WO 2006054496 A1 WO2006054496 A1 WO 2006054496A1 JP 2005020740 W JP2005020740 W JP 2005020740W WO 2006054496 A1 WO2006054496 A1 WO 2006054496A1
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- pattern
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- aberration
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70605—Workpiece metrology
- G03F7/70653—Metrology techniques
- G03F7/70675—Latent image, i.e. measuring the image of the exposed resist prior to development
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70491—Information management, e.g. software; Active and passive control, e.g. details of controlling exposure processes or exposure tool monitoring processes
- G03F7/70525—Controlling normal operating mode, e.g. matching different apparatus, remote control or prediction of failure
Definitions
- the present invention relates to a method and system for detecting synchronization accuracy of an exposure apparatus used in a photolithography process for a semiconductor wafer or a flat panel display (FPD) substrate, an aberration detection method and system for the exposure apparatus, and a computer program.
- FPD flat panel display
- a resist solution is applied to the wafer surface to form a resist film, and the resist film is exposed to a predetermined pattern and developed. Thus, a pattern is formed on the resist film.
- the resist pattern line width, hole diameter, and LER Line Edge Roughness
- the resist pattern is deformed when the relative moving speed of the wafer stage and the reticle stage provided in the exposure apparatus is not constant, that is, when the synchronization accuracy is not good. It has been. If a deformed pattern is formed due to poor synchronization accuracy, the product may not perform as desired or may malfunction. Therefore, it is important to maintain high synchronization accuracy.
- the LER of the resist pattern has a great influence on the product characteristics. Specifically, in a contact pattern with a diameter of 160 nm or less, the occurrence of LER cannot be ignored!
- field aberration field curvature
- this field aberration is evaluated by, for example, a photomask (reticle) on which a pattern in which transmission areas and non-transmission areas are alternately arranged with a constant line width is formed.
- the exposure value is constant
- the focus value is changed
- different areas of the resist film are sequentially exposed and developed
- the line width of the resulting resist pattern is set for each shot area of each exposure. Measure with a length measuring SEM at multiple points in the area (for example, 5 points at the center and four corners of each area).
- Patent Document 1 Japanese Unexamined Patent Publication No. 2003-197503
- An object of the present invention is to provide a synchronization accuracy detection method and system for an exposure apparatus for increasing the synchronization accuracy when exposing a resist film.
- Another object of the present invention is to provide an aberration detection method and system of an exposure apparatus for improving the aberration accuracy when exposing a resist film.
- Still another object of the present invention is to provide a computer program for carrying out the synchronization accuracy detection method and the aberration detection method.
- a resist film is formed on a substrate, the resist film is exposed to light using a photomask on which a test pattern is formed, and the substrate is By developing, measuring the shape of the resist pattern formed by using the test pattern by a ski terometry technique, and comparing the measured shape of the resist pattern with the shape of the test pattern.
- a synchronization accuracy detection method comprising grasping a degree of deformation of a resist pattern and detecting presence / absence of synchronization failure of an exposure apparatus based on the grasped degree of deformation of the resist pattern.
- a synchronization accuracy detection system for detecting synchronization accuracy in an exposure apparatus that forms an exposure pattern by exposing a resist film formed on a substrate with a predetermined pattern.
- a pattern shape measuring device that measures the shape of the resist pattern obtained by exposing and developing the resist film formed on the resist film using a photomask on which a test pattern is formed and developing the pattern, and a measurement Means for grasping the degree of deformation of the resist pattern by comparing the shape of the resist pattern with the shape of the test pattern, and based on the grasped degree of deformation of the resist pattern,
- a synchronization accuracy detection system having means for detecting presence or absence.
- an exposure apparatus that exposes a resist film formed on a substrate in a predetermined pattern to form an exposure pattern, and an exposure pattern after the resist film is applied to the substrate and exposed
- a computer program that controls a computer to detect a synchronization accuracy of an exposure apparatus, and a system having a resist coating and developing apparatus that develops the image and a pattern shape measuring apparatus that measures the shape of the resist pattern after development using a scatterometry technique Therefore, at the time of execution, a function of forming a resist film on the substrate, a function of exposing the resist film using a photomask on which a test pattern is formed, a function of developing the substrate, and the test A function to measure the shape of a resist pattern formed by using a pattern by a scan telometry technique; The function of grasping the degree of deformation of the resist pattern by comparing the determined shape of the resist pattern with the shape of the test pattern, and the synchronization of the exposure apparatus based on the grasped degree of deformation
- a resist film is formed on a substrate, and a photomask on which a test pattern for measuring aberrations of a lens of an exposure apparatus is formed is formed on the resist film.
- the exposure amount and the focus value are respectively changed to sequentially expose a plurality of parts of the resist film, the substrate is developed, and the shape of the resist pattern formed using the test pattern is changed to the part.
- an aberration detection method comprising detecting aberration of a lens of an exposure apparatus.
- an aberration detection system for detecting an aberration in an exposure apparatus that exposes a resist film formed on a substrate with a predetermined pattern to form an exposure pattern.
- a photomask on which a test pattern for measuring lens aberration is formed the exposure amount and the focus value are changed, and a plurality of portions of the resist film are sequentially exposed, exposed, and developed.
- a pattern shape measuring device for measuring the shape of the resist pattern obtained by the sky telometry technique, means for grasping the relationship between the shape of the obtained resist pattern and the focus value, and based on these relationships, the exposure device
- An aberration detection system is provided having means for detecting lens aberrations.
- an exposure apparatus that exposes a resist film formed on a substrate in a predetermined pattern to form an exposure pattern, and an exposure pattern after the resist film is applied to the substrate and exposed.
- a computer that causes a computer to control a system having a resist coating device for developing a pattern and a pattern shape measuring device for measuring the shape of a resist pattern after development using a scatterometry technique so as to detect lens aberration of the exposure device Use a photomask with a function to form a resist film on the substrate at the time of execution and a test pattern for measuring the aberration of the lens of the exposure device. And a function for sequentially exposing a plurality of portions of the resist film by changing the focus value and a machine for developing the substrate.
- the function of measuring the shape of the resist pattern formed by using the test pattern for each part and at a plurality of locations in the part by the skier telometry technique, and the obtained resist pattern The function of grasping the relationship between the shape of the image and the focus value and the exposure apparatus level based on these relationships And a computer program having a function of detecting the aberration of the lens.
- the test pattern is preferably a pattern in which transmission regions and non-transmission regions having a certain line width are alternately arranged in a line.
- the aberration is any one of image aberration, astigmatism, and spherical aberration.
- the measurement of the pattern shape is preferably performed by measuring the line width of the pattern.
- the influence of LER can be eliminated, and synchronous detection and aberration detection can be performed with high accuracy and force in a short time.
- the exposure apparatus can be adjusted appropriately and the quality of the product can be improved.
- FIG. 1 is a plan view showing a schematic configuration of a resist coating / development processing system.
- FIG. 2 is a front view showing a schematic configuration of a resist coating / development processing system.
- FIG. 3 is a rear view showing a schematic configuration of a resist coating / developing system.
- FIG. 4 is a diagram showing a control system for a resist coating / developing system and an exposure apparatus.
- FIG. 5A A diagram schematically showing the state of the pattern when the synchronization accuracy of the circular pattern is normal.
- FIG. 5B is a diagram schematically showing the state of a pattern deformed due to poor synchronization accuracy of a circular pattern.
- FIG. 5C is a diagram schematically showing the state of a pattern deformed due to poor synchronization accuracy of a circular pattern.
- FIG. 6A A diagram schematically showing an elliptical pattern without LER.
- FIG. 6B is a diagram schematically showing pattern deformation by LER of an elliptical pattern.
- FIG. 6C is a diagram schematically showing pattern deformation by LER of an elliptical pattern.
- FIG. 6D is a diagram schematically showing pattern deformation by LER of an elliptical pattern.
- FIG. 7 is a flowchart showing a synchronization accuracy detection method according to the first embodiment of the present invention.
- FIG. 8 is a schematic diagram showing a pattern with good synchronization accuracy.
- FIG. 9 is a schematic diagram showing a pattern in which the synchronization accuracy is poor.
- FIG. 11 is a flowchart showing a method for detecting field aberration (field curvature) according to the first method of the second embodiment of the present invention.
- FIG. 12 is a diagram showing a pattern of a photomask used for detection of image surface aberration.
- FIG. 13 is a diagram showing the setting of a plurality of exposure areas, focus values, and exposure order.
- FIG. 14 is a diagram showing a setting example of line width measurement points in an exposure area.
- FIG. 15 is a graph showing the relationship between the line width of a resist pattern at each measurement point and the focus value used for detecting image plane aberration.
- FIG. 16 is a flowchart showing an astigmatism detection method according to a second method of the second embodiment of the present invention.
- FIG. 17 is a diagram showing a pattern of a photomask used for detecting astigmatism.
- FIG. 18 is a graph showing the relationship between the line width of each resist pattern in the X and Y directions and the focus value used to detect astigmatism.
- FIG. 19 is a graph showing the relationship between the line width (CD) measured by a length measurement SEM and the focus value for investigating astigmatism.
- FIG. 20 is a flowchart showing a spherical aberration detection method according to a third method in the second embodiment of the present invention.
- FIG. 21 is a diagram showing a pattern of a photomask used for detecting spherical aberration.
- FIG. 22 is a graph showing the relationship between the resist pattern line width and the focus value for each photomask pattern line width used to detect spherical aberration.
- FIG. 23 is a graph showing the relationship between the line width (CD) measured by a length measurement SEM and the focus value for examining spherical aberration.
- FIG. 1 is a plan view showing a schematic configuration of a resist coating and development processing system for forming a resist film and developing a substrate after exposure
- FIG. 2 is a front view thereof
- FIG. 3 is a rear view thereof. is there. 1 to 3 are shown in a state where the exposure apparatus 14 is connected to the resist coating / development processing system 1.
- the resist coating / development processing system 1 includes a cassette station 11 as a transfer station, a processing station 12 having a plurality of processing units, an exposure apparatus 14 and a processing station 12 provided adjacent to the processing station 12. And an interface station 13 for transferring the wafer W to and from the terminal.
- a wafer cassette (CR) containing a plurality of (for example, 25) wafers W is loaded and unloaded.
- a plurality (five in FIG. 1) of positioning protrusions 20a for mounting a wafer cassette (CR) are provided in one row along the X direction.
- the wafer cassette (CR) is placed with the wafer loading / unloading port facing the processing station 12 side.
- the cassette station 11 includes a wafer transfer mechanism 21 having a wafer transfer pick 21a.
- the pick 21a for wafer transfer can selectively access any one of the wafer cassettes (CR), and a transition unit (TRS-G) provided in the third processing unit group G of the processing station 12 described later. ) Can be accessed.
- CR wafer cassettes
- TRS-G transition unit
- the processing station 12 has a third processing unit group G, a fourth processing unit group G, and a fifth processing unit group G in order from the cassette station 11 side on the rear side of the system (upper side in FIG. 1).
- the first main transport unit is disposed between the third processing unit group G and the fourth processing unit group G.
- the second main transport unit is disposed between the fourth processing unit group G and the fifth processing unit group G.
- the first processing unit group G and the second processing unit group G are also provided in order.
- a high-temperature heat treatment unit (BA
- CPL-G high-precision temperature control unit
- a transition unit (TRS-G) serving as a wafer W transfer unit between the cassette station 11 and the first main transfer unit A1 is stacked in, for example, 10 stages.
- the fourth processing unit group G for example, a heat treatment is performed on the wafer W after resist coating.
- a pre-beta unit (PAB), a post-bake unit (POST) that heat-processes the developed wafer W, and a high-precision temperature control unit (CPL-G), for example, are stacked in 10 steps.
- heat treatment is performed on the wafer W after exposure and before development.
- PEB Post-exposure bake unit
- CPL-G high-precision temperature control unit
- a sixth processing unit group G having an adhesion unit (AD) and a heating unit (HP) for heating the wafer W is provided on the back side of the first main transfer unit 8e. .
- a peripheral exposure device that selectively exposes the edge of the wafer W (
- WEE line width measuring device
- ODP line width measuring device
- FTI film thickness measuring device
- the sky telometry technique used in the line width measuring device is to calculate the diffracted light intensity distribution for a plurality of pattern shapes, for example, by creating a library in advance and measuring The light is incident on the pattern, the angular direction distribution of the diffracted light intensity is detected, the detection result is compared with the above library, and the width and height of the pattern to be measured are estimated by pattern matching. For example, it is described in JP-A-2002-260994.
- first processing unit group G three resist coating units (COT) for forming a resist film and a bottom coating unit (BARC) for forming an antireflection film are stacked in a total of five stages.
- COT resist coating units
- BARC bottom coating unit
- CP indicates a coater cup
- SP spin chuck
- DEV development units
- a first main wafer transfer unit 16 is provided in the first main transfer unit A.
- the first main wafer transfer device 16 includes three arms for holding the wafer W. These arms rotate integrally around the Z axis, move up and down in the Z axis direction, and separately in the horizontal direction. Stretchable (in the XY plane). As a result, the first main wafer transfer device 16 is selective to each of the first processing unit group G, the third processing unit group G, the fourth processing unit group G, and the sixth processing unit group G.
- the second main transfer unit A has the same configuration as the first main wafer transfer unit 16.
- a second main wafer transfer device 17 having a structure is provided.
- the second main wafer transfer device 17 includes a second processing unit group G, a fourth processing unit group G, a fifth processing unit group G, and a seventh processing unit.
- Each unit of the knit group G can be selectively accessed.
- the first and second processing unit groups G 1 and G 2 Liquid temperature control pumps 24 and 25 that supply processing liquid to the
- a first control unit 31 that controls the resist coating / development processing system 1 as a whole is provided below the cassette station 11.
- the rear panel and the first processing unit group G to the seventh processing unit group G of the processing station 12 can be removed for maintenance.
- the interface station 13 includes a first interface station 13a on the processing station 12 side and a second interface station 13b on the exposure apparatus 14 side.
- the first interface station 13a has an opening for the fifth processing unit group G.
- a first wafer carrier 18 is arranged so as to face 5, and a second wafer carrier 19 which is movable in the X direction is arranged at the second interface station 13 b.
- the upper force is also in order, with a transition unit (TRS-G) and two stages of high-precision temperature control
- a ninth processing unit group G is provided, in which stacks (CPL-G) are stacked.
- the first wafer transfer body 18 has a fork 18a for wafer transfer. This fork 18a is divided into the fifth processing unit group G, the eighth processing unit group G, and the ninth processing unit group G.
- the second wafer transport body 19 has a fork 19a for wafer transfer.
- the fork 19a includes the units of the ninth processing unit group G, the in-stage 14a and the out-stay of the exposure apparatus 14.
- the wafer W can be loaded into the in-stage 14a of the exposure apparatus 14 and the lamp has a constant force indicating that Z cannot be carried out.
- the second interface station 13b is provided with a sensor for recognizing the display state of these lamps, and the fork 19a holding the wafer W attaches the wafer W to the in-stage 14a according to the recognition result of this sensor.
- the loaded fork 19a is configured to access the outstage 14b and unload the wafer W according to the recognition result of the sensor.
- One wafer W taken out from (CR) is transferred to, for example, the transition unit (TRS-G) of the processing station 12, and temperature control and adhesion control in the temperature control unit (TCP) are performed.
- TRS-G transition unit
- TCP temperature control unit
- Adhesion treatment in knit formation of anti-reflection film in bottom coating unit (BARC), heat treatment in heating unit (HP), beta treatment in high temperature heat treatment unit (BAKE), high precision temperature control unit ( Temperature control with CPL-G), resist coating tool
- the resist solution is applied to the exposure apparatus 14 after undergoing a resist solution coating process at the COT, a pre-beta process at the pre-beta unit (PAB), and a peripheral exposure process at the peripheral exposure apparatus (WEE). Then, the wafer W is exposed to the transition unit (TRS-G) after exposure by the exposure apparatus 14.
- PEB post-exposure bake processing in post-exposure beta unit
- DEV development processing in development unit
- POST post-beta processing in post-beta unit
- CR wafer cassette
- the resist coating / development processing system 1 is controlled by the first control unit 31, and the exposure apparatus 14 is controlled by the second control unit 32.
- the first control unit 31 includes a first process controller (CPU) 35, and an operator applies resist.
- CPU process controller
- FIG. 4 some processing units and the like controlled by the first control unit 31 are illustrated, and not all the control targets are illustrated.
- the second control unit 32 visualizes and displays the operating status of the second process controller (CPU) 41 and the keyboard and the exposure apparatus 14 on which the operator performs command input operations in order to manage the exposure apparatus 14
- a second data input / output unit 42 having a display and a control program 44a and a recipe 44b for executing each processing condition executed by the exposure apparatus 14 under the control of a second process controller (CPU) 35 are recorded.
- a second recording unit 43 From the second process controller (CPU) 41 to a drive unit in the exposure apparatus 14 (for example, a mechanism for adjusting the position of the wafer W or the lens position for adjusting the focus or a lens position, a mechanism for adjusting the amount of light, etc.) A control signal is sent.
- the data relating to the exposure processing of the wafer W, the data for adjusting the exposure apparatus 14 and the like can be bidirectionally communicated.
- One face 33 is provided!
- FIGS. 5B and 5C show SEM photographs showing pattern deformation due to poor synchronization accuracy of the pattern for forming a substantially circular contact hole, for example.
- FIG. 5A shows a state in which a substantially circular pattern is formed when the synchronization accuracy is good.
- FIG. 5B shows a state in which the state force synchronization accuracy shown in FIG. 5A is deviated, and an inclined elliptic pattern is formed.
- FIG. 5C shows a state in which the synchronization accuracy is further deviated from the state shown in FIG. 5B, and shows a state in which adjacent elliptical patterns are connected in a daisy chain. If the patterns shown in FIGS. 5B and 5C are formed, the product may not perform as desired or may malfunction.
- FIGS. 6A to 6D schematically showing an elliptical pattern.
- Fig. 6A shows a state where no LER occurs and is observed as a good elliptic pattern 105
- Fig. 6B shows FIG. 6C shows a pattern 107 in which it can be determined that the ellipse has extended to the major axis side by LER
- FIG. 6C shows a pattern 107 in which it can be determined that the ellipse has extended to the minor axis side.
- FIG. 6D shows a pattern 108 that can be judged as if the ellipse was tilted by LER! /.
- FIG. 7 is a flowchart showing the synchronization accuracy detection method according to this embodiment.
- a resist film is formed on the surface of the dummy wafer W (Step 1).
- the dummy wafer W a wafer having a uniform thickness and a high flatness as much as possible is used. This is because if the surface of the dummy wafer W itself is uneven, or if the thickness is uneven and the surface is inclined, the resist pattern that is formed is distorted and the detection accuracy of the synchronization accuracy is lowered. This is to avoid it.
- the resist film formed on the dummy wafer W is used with a photomask (reticle) in which a circular pattern is formed at a predetermined pitch, and the detection of synchronization accuracy currently performed, for example, is completed.
- the exposure is applied with the exposure amount and focus value that are applied to product production (step 2).
- the circular pattern at this time later becomes a non-transmissive region (light-shielding region), and a portion of the resist film that has not been irradiated with light is dissolved by development, so that a circular hole is formed in the resist film.
- the wafer W that has been exposed is developed (step 3).
- a hole derived from the circular pattern of the photomask is formed in the resist film, and the shape of this hole is measured using the above-mentioned line width measuring device (ODP) by the skier telometry technique (Step 4).
- ODP line width measuring device
- the measurement of the hole shape in the line width measuring device (ODP) for example, light of a predetermined wavelength is incident on a portion of several tens / zm and the spectral reflection spectrum is measured. The measured spectral reflection spectrum is sent to the first control unit 31, where the spectral reflection spectrum is analyzed. (Step 5).
- the first control unit 31 executes the analysis program 39a, collates the obtained spectral reflection vector with the library 39b, and has an average shape of holes, for example, a circle having a diameter X.
- Information such as the major axis is Y, the minor axis is ⁇ , and the major axis is an ellipse whose angle is ⁇ deviated from the original direction, and this hole shape is compared with the circular pattern of the photomask (Ste 6). Then, as a result of the comparison, it is determined whether or not the synchronization accuracy is good (step 7).
- the hole is an ellipse that is inclined in a predetermined direction, for example.
- the process proceeds to the processing of the product wafer through one of the following processes (step 8).
- the first control unit 31 outputs an optical signal (such as a green lamp) indicating that the synchronization accuracy is good, and automatically shifts to processing of a product wafer.
- the first control unit 31 displays the result of the synchronization accuracy detection on the display of the data input / output unit 32, and after the input indicating that the result is confirmed by the operator is performed, the processing of the product wafer is performed. Start.
- Step 7 the measurement result for the hole may be displayed on the data input / output unit 32, and the operator may examine the result to determine whether the synchronization accuracy is good or bad.
- the line width measuring device for example, light having a predetermined wavelength is incident on a part of several tens / zm mouth, its spectral reflection spectrum is measured, and the obtained spectral reflection spectrum is obtained. Since the average shape of the hole is grasped by comparing with the library 39b, even if the LER is formed in the hole to be measured, the LER information is not included in the measurement principle. Therefore, it is possible to grasp the quality of synchronization accuracy without being confused by L ER in a short time with high accuracy. It is possible to take an appropriate action when the synchronization accuracy is insufficient.
- evaluation of field aberration has conventionally been performed using a photomask (reticle) in which a pattern in which transmission areas and non-transmission areas are alternately arranged with a fixed line width is formed.
- the exposure value is constant, the focus value is changed, different areas of the resist film are sequentially exposed and developed, and the line width of the resulting resist pattern is set for each exposure shot area and at multiple locations in each area. This is done by measuring with a length measuring SEM (for example, a total of 5 points at the center and four corners of each area).
- each line is represented by a broken line as the LER occurs. Therefore, it is difficult to determine at which focus value the CD value is minimized. Therefore, with the conventional method, it is extremely difficult to adjust the exposure conditions so that the curvature of field when LER occurs is corrected. Other aberrations have similar difficulties.
- FIG. 11 is a flowchart showing a method for detecting field aberration (field curvature) according to this embodiment.
- a resist film is formed on the surface of the dummy wafer W (Step 101). Subsequently, as shown in FIG. 12, transmissive regions 91 and non-transmissive regions 92 having a certain line width are alternately arranged in a line. Using a photomask having the test pattern, the exposure is kept constant, the focus value is changed, and exposure is performed sequentially (step 102). By exposing in this way, a portion of the resist film that has not been irradiated with light afterward due to the light-impermeable region 92 is dissolved by development, whereby a linear pattern with a constant width is fixed on the resist film. Formed at intervals.
- the exposure amount in this step 102 can be fixed to a value that is normally used at the product production site or a value that has the least manufacturing margin.
- the focus value is centered on the focus value set for product production (hereinafter referred to as “focus value F”).
- the area of the exposure area S is preferably matched to the maximum field size of the exposure apparatus 14.
- step 103 the wafer W that has been exposed is developed (step 103).
- step 104 a plurality of measurement points, for example, a total of 5 points (P
- the first control unit 31 obtains the line width of the resist pattern at the point P by searching the spectrum having the closest shape to the obtained spectral reflection spectrum from the spectral reflection spectrum of the library 39b. Do the same for point P.
- the line width of the resist pattern is obtained for each point. Further, the measurement of the spectral reflection spectrum and the determination of the line width are performed for each exposure area s.
- the first control unit 31 is used when the line width of the resist pattern of the points P to P set in each exposure area S and each exposure area S is exposed using the analysis program 39a.
- step 105 The relationship with the single value is obtained (step 105).
- step 105 the calculation is performed by being sent from the second control unit 32 of the exposure apparatus 14 to the first control unit 31 via the exposure condition force interface 33 in each exposure area S.
- the graph shown in FIG. 13 is obtained.
- the point P pattern line obtained in step 105 is obtained.
- the resist is a negative resist that is irradiated with light and the portion is dissolved, if the focus value is not appropriate, the region irradiated with light is expanded, and thereby the line width is increased. As shown in Figure 15, the point P-track value is set appropriately by step 105.
- a curve with a minimum line width is obtained at this portion.
- the line width measuring device (ODP) force is not affected by LER, and the average value of the line width is detected. For this reason, a smooth curve is obtained which is not the case with the line graph with severe irregularities as shown in Fig. 10.
- the field aberration field curvature is given by the difference between the minimum value F and the maximum value F of the focus value that gives the minimum value of the line width (CD) in the five straight lines in FIG. Smooth like this
- field aberration field curvature
- Step 107 it is determined whether or not the field aberration (field curvature) thus determined is equal to or less than a predetermined value. If it is determined in step 107 that the field aberration is equal to or smaller than the predetermined value, the product wafer is processed (step 108). If the difference exceeds the predetermined value, this field aberration (field curvature) is determined. ) Is adjusted so that the optical system of the exposure apparatus 14 becomes smaller (step 109).
- the focus value of the exposure device 14 is set to this optimum focus value F.
- FIG. 16 is a flowchart showing an astigmatism detection method according to this embodiment.
- a resist film is formed on the surface of the dummy wafer W in the same manner as in the above step 101 (step 201).
- the exposure amount is constant, the focus value is changed, and exposure is performed sequentially (step 202).
- the exposure amount and focus value in this exposure process The setting is the same as step 102 described above.
- step 103 the exposed wafer W is developed (step 203), and then the formed resist pattern is applied to the above-described line width measuring device (ODP).
- ODP line width measuring device
- V Measure using the scan telometry technique (step 204).
- the line width in the X direction is measured for the pattern portion derived from the region ⁇
- the line width in the Y direction is measured for the pattern portion derived from the region K.
- step 205 the relationship between the line width and the focus value used when exposing the exposure area S is obtained.
- the calculation is performed by being sent from the second control unit 32 of the exposure apparatus 14 to the first control unit 31 via the exposure condition force S interface 33 in each exposure area S, for example, as shown in FIG. A graph can be obtained.
- Astigmatism is also detected from the relationship between the line width in the X direction and Y direction obtained in step 205 and the focus value used when each exposure area S is exposed (step 206).
- the difference between the focus value that gives the minimum value of the line indicating the line width in the X direction and the focus value that gives the minimum value of the line that shows the line width in the Y direction is astigmatism. Then, it is determined whether this value is equal to or less than a predetermined value (step 207).
- the average value of the line width is detected without being affected by the LER, so that the minimum value of the line indicating the line width in the X direction is given. It is easy to detect the focus value that gives the force value and the minimum value of the line indicating the line width in the Y direction, and astigmatism expressed as the difference between these focus values can be detected easily and accurately. can do.
- step 207 If it is determined in step 207 that the astigmatism is equal to or less than the predetermined value, the product wafer is processed (step 208). If the difference exceeds the predetermined value, the astigmatism is determined. The optical system of the exposure apparatus 14 is adjusted so as to be small (step 209). As a result, the astigmatism difference can be suppressed within an allowable range.
- FIG. 19 shows the results of line width measurement by length measurement SEM as a reference example.
- the focus value and the line width in the X direction are both broken lines, and the focus value giving the minimum value of the line width in the X direction and the line width in the Y direction are It can be seen that it is difficult to determine the focus value that gives the minimum value of the line. For this reason, judgment of the astigmatism value may differ depending on the observer, and it is difficult to detect astigmatism with high accuracy.
- FIG. 20 is a flowchart showing an astigmatism detection method according to this embodiment.
- a resist film is formed on the surface of the dummy wafer W as in the above step 101 (step 301).
- a test pattern having five regions R to R with different line widths of the transmission region 95 provided in the non-transmission region 96 is used, and the exposure amount is set.
- region R has a target line width of 100 nm for the resist pattern to be formed, and region R has a target line width of 1 lOnm.
- Region R has a target line width of 120 nm, Region R has a target line width of 130 nm, and Region R has a target line width of
- step 103 the exposed wafer W is developed (step 303), and then the formed resist pattern is used using the above-described line width measuring device (ODP).
- ODP line width measuring device
- V Measure using the scan telometry technique (step 304).
- the area R is within the exposure area S of one shot (see Fig. 14).
- the line width at the center of each pattern area is measured for each exposure area S, and the relationship between these line widths and the focus value used when exposing the exposure area S is determined (step 305). ).
- the calculation is sent from the second control unit 32 of the exposure apparatus 14 to the first control unit 31 via the exposure condition force interface 33 in each exposure area S, for example, as shown in FIG. Test pattern area R is drawn
- the relationship with the focus value used when the area S is exposed also detects spherical aberration (step 306).
- the focus value giving the minimum line width is the maximum.
- the difference between the small value and the maximum value is the spherical aberration. Then, it is determined whether or not this value is below a predetermined value (step 307).
- the average value of the line width is detected without being affected by the LER. It is easy to obtain the minimum value and the maximum value of the focus value that gives the spherical value, and the spherical aberration expressed as the difference between these focus values can be detected easily and with high accuracy.
- step 307 if it is determined that the spherical aberration is equal to or less than the predetermined value, the product wafer is processed (step 308). If the difference exceeds the predetermined value, astigmatism is reduced. The optical system of the exposure apparatus 14 is adjusted so as to be small (step 309). As a result, the astigmatism difference can be suppressed within an allowable range.
- FIG. 23 shows a line width measurement result by a length measurement SEM as a reference example.
- each line is a broken line, and it is difficult to determine the minimum and maximum focus values that give the minimum line width. I know that there is. For this reason, there is a possibility that the judgment of the value of the spherical aberration may differ depending on the observer, and it is difficult to detect the spherical aberration with high accuracy.
- the hole shape of the pattern may be measured with a line width measuring device (ODP).
- ODP line width measuring device
- the skier telometry technique it is possible to measure the width of the bottom of the resist pattern and the inclination angle of the side surface, which is not just the line width of the resist pattern (the line width of the upper surface of the pattern). Therefore, it is possible to obtain various aberrations based on these measured values and adjust the optical system of the exposure apparatus 14.
- the present invention is shown when the present invention is applied to a semiconductor wafer as a substrate.
- the present invention is also applied to a photolithography technique for a glass substrate for FPD (flat panel display). Can be applied.
- the arrangement position of the line width measuring device (ODP) is not limited to the position shown in the above embodiment, and for example, it may be arranged at a position where the wafer transfer mechanism 21 can access.
- the present invention is suitable for the manufacture of semiconductor devices and FPDs, and is particularly effective for adjusting an exposure apparatus for forming a fine pattern with a hole diameter of 160 nm or less.
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- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2001097279A2 (en) * | 2000-06-09 | 2001-12-20 | Advanced Micro Devices, Inc. | Method and apparatus for using scatterometry to perform feedback and feed-forward control |
JP2002158169A (ja) * | 2000-09-04 | 2002-05-31 | Infineon Technologies Sc300 Gmbh & Co Kg | リソグラフィツールの調整方法 |
WO2003001297A2 (en) * | 2001-06-26 | 2003-01-03 | Kla-Tencor Corporation | Method for determining lithographic focus and exposure |
JP2004200680A (ja) * | 2002-11-01 | 2004-07-15 | Asml Netherlands Bv | 検査方法およびデバイス製造方法 |
JP2004235460A (ja) * | 2003-01-30 | 2004-08-19 | Nikon Corp | 露光システム、走査型露光装置及び露光方法 |
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---|---|---|---|---|
WO2001097279A2 (en) * | 2000-06-09 | 2001-12-20 | Advanced Micro Devices, Inc. | Method and apparatus for using scatterometry to perform feedback and feed-forward control |
JP2002158169A (ja) * | 2000-09-04 | 2002-05-31 | Infineon Technologies Sc300 Gmbh & Co Kg | リソグラフィツールの調整方法 |
WO2003001297A2 (en) * | 2001-06-26 | 2003-01-03 | Kla-Tencor Corporation | Method for determining lithographic focus and exposure |
JP2004200680A (ja) * | 2002-11-01 | 2004-07-15 | Asml Netherlands Bv | 検査方法およびデバイス製造方法 |
JP2004235460A (ja) * | 2003-01-30 | 2004-08-19 | Nikon Corp | 露光システム、走査型露光装置及び露光方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009064857A (ja) * | 2007-09-05 | 2009-03-26 | Renesas Technology Corp | 半導体集積回路およびそのパターンレイアウト方法 |
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