WO2021220697A1 - 荷電粒子ビーム描画方法及び荷電粒子ビーム描画装置 - Google Patents
荷電粒子ビーム描画方法及び荷電粒子ビーム描画装置 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/147—Arrangements for directing or deflecting the discharge along a desired path
- H01J37/1471—Arrangements for directing or deflecting the discharge along a desired path for centering, aligning or positioning of ray or beam
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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
- G03F7/20—Exposure; Apparatus therefor
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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
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2059—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a scanning corpuscular radiation beam, e.g. an electron beam
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/302—Controlling tubes by external information, e.g. programme control
- H01J37/3023—Programme control
- H01J37/3026—Patterning strategy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/305—Electron-beam or ion-beam tubes for localised treatment of objects for casting, melting, evaporating or etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/317—Electron-beam or ion-beam tubes for localised treatment of objects for changing properties of the objects or for applying thin layers thereon, e.g. for ion implantation
- H01J37/3174—Particle-beam lithography, e.g. electron beam lithography
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/30—Electron or ion beam tubes for processing objects
- H01J2237/304—Controlling tubes
- H01J2237/30433—System calibration
- H01J2237/3045—Deflection calibration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/30—Electron or ion beam tubes for processing objects
- H01J2237/304—Controlling tubes
- H01J2237/30455—Correction during exposure
- H01J2237/30461—Correction during exposure pre-calculated
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/30—Electron or ion beam tubes for processing objects
- H01J2237/317—Processing objects on a microscale
- H01J2237/3175—Lithography
- H01J2237/31776—Shaped beam
Definitions
- the present invention relates to a charged particle beam drawing method and a charged particle beam drawing device.
- a high-precision original image pattern formed on quartz using a reduction projection exposure device (a mask, or one used especially in a stepper or scanner is also called a reticle). ) Is reduced and transferred onto the wafer.
- the high-precision original image pattern is drawn by an electron beam drawing apparatus, and so-called electron beam lithography technology is used.
- the beam irradiation amount dependence of the charge amount was obtained from the drawing evaluation for each substrate. Therefore, every time the resist film thickness is changed or the concentration of the acid generator or the like contained in the resist is changed, it is necessary to draw an evaluation pattern and evaluate the drawing result in order to estimate the charge amount of the substrate. There was a lot of work. In addition, the downtime of the device has been prolonged.
- An object of the present invention is to provide a charged particle beam drawing method and a charged particle beam drawing device capable of quickly and accurately calculating the charge amount of a substrate.
- the charged particle beam drawing method is a charged particle beam drawing method in which a charged particle beam is deflected by a deflector and the substrate on which a resist film is formed is irradiated with the charged particle beam to draw a pattern.
- the electric charge is charged from the film thickness of the resist film formed on the substrate and the calculated dose amount.
- It includes a step of calculating the amount, a step of calculating the amount of misalignment of the drawing position from the calculated amount of charge, and a step of correcting the irradiation position of the charged particle beam using the amount of misalignment.
- the charged particle beam drawing device is a charged particle beam drawing device that deflects a charged particle beam with a deflector and irradiates the substrate on which a resist film is formed with the charged particle beam to draw a pattern.
- the emission unit that emits the charged particle beam
- the pattern density calculation unit that virtually divides the drawing area of the substrate into a mesh shape, and calculates the pattern density indicating the arrangement ratio of the pattern for each mesh area, and the pattern.
- a dose amount calculation unit that calculates the dose amount indicating the dose amount for each mesh region using the density
- a storage unit that stores a function for calculating the charge amount with the film thickness and the dose amount of the resist film as variables, and a storage unit.
- a position shift amount calculation unit that calculates the position shift amount of the drawing position from the charge amount, a correction unit that corrects the irradiation position of the charged particle beam using the position shift amount, and the corrected irradiation position. It includes a drawing unit that irradiates the charged particle beam.
- the charge amount of the substrate can be calculated quickly and accurately.
- FIG. 3a is a schematic diagram showing ionization in the resist layer
- FIG. 3b is a diagram showing an equivalent circuit simulating a resist film
- FIG. 4a is a diagram showing a test layout used for measuring the resist charging effect
- FIG. 4b is a schematic diagram of a box array.
- It is a figure which shows the example of the displacement amount distribution obtained from the evaluation of a test layout.
- It is a figure which shows the example of the displacement amount distribution obtained from the calculation formula.
- 7a and 7b are graphs showing the correlation of the displacement amount distribution.
- 8a to 8d are graphs for comparing the drawing evaluation result and the function calculation result. It is a flowchart explaining the drawing method which concerns on this embodiment.
- the charged particle beam is not limited to the electron beam, and may be an ion beam or the like.
- FIG. 1 is a schematic configuration diagram of a drawing device according to an embodiment.
- the drawing device 100 shown in FIG. 1 includes a drawing unit W and a control unit C.
- the drawing device 100 is an example of an electron beam drawing device.
- the drawing unit W has an electronic lens barrel 1 and a drawing chamber 14. Inside the electron barrel 1, an electron gun 5, an illumination lens 7, a first aperture plate 8, a projection lens 9, a molding deflector 10, a second aperture plate 11, an objective lens 12, an objective deflector 13, and an electrostatic lens are included. 15 is arranged.
- the XY stage 3 is arranged in the drawing room 14.
- a substrate 2 to be drawn is arranged on the XY stage 3.
- the substrate 2 includes a photomask used for exposure in semiconductor manufacturing, a semiconductor wafer on which a semiconductor device is formed, and the like.
- the photomasks that are drawn include mask blanks that have not yet been drawn.
- the substrate 2 has quartz, a chromium film provided on the quartz, and a resist layer provided on the chromium film.
- a mirror 4 for measuring the stage position is arranged on the XY stage 3 at a position different from the position where the substrate 2 is arranged.
- a calibration mark M is provided on the XY stage 3 at a position different from the position where the substrate 2 is arranged.
- the mark M is a metal cross shape
- the mark M is scanned with an electron beam
- the reflected electrons from the mark M are detected by a detector (not shown), and the focus adjustment, the position adjustment, and the deflection shape correction coefficient are detected.
- the control unit C has control computers 110 and 120, a stage position detection unit 45, a stage control unit 46, a deflection control circuit 130, a memory 142, storage devices 21 and 140 such as a magnetic disk device, and the like.
- the deflection control circuit 130 is connected to the molding deflector 10 and the objective deflector 13.
- the control computer 110 has the functions of a drawing control unit 30, a pattern density distribution calculation unit 32, a dose amount distribution calculation unit 34, a charge amount distribution calculation unit 36, and a misalignment amount distribution calculation unit 38 that control the entire device.
- Each part of the control computer 110 may be composed of hardware including an electric circuit, a computer, a processor, a circuit board, a quantum circuit, a semiconductor device, or the like, or may be composed of software.
- the input data and the calculation result of each part of the control computer 110 are stored in the memory 142.
- the control computer 120 has the functions of the shot data generation unit 41 and the misalignment correction unit 42.
- the shot data generation unit 41 and the misalignment correction unit 42 may be configured by software or hardware.
- the deflection control circuit 130 has the functions of the molding deflector control unit 43 and the objective deflector control unit 44.
- the molding deflector control unit 43 and the objective deflector control unit 44 may be configured by software or hardware.
- the storage device 140 stores drawing data (layout data) in which a plurality of graphic patterns to be drawn are defined.
- the electron beam 6 emitted from the electron gun 5 illuminates the entire first aperture plate 8 having a rectangular hole by the illumination lens 7.
- the electron beam 6 is first formed into a rectangle.
- the electron beam 6 of the first aperture image that has passed through the first aperture plate 8 is projected onto the second aperture plate 11 by the projection lens 9.
- the position of the first aperture image on the second aperture plate 11 is deflected by the forming deflector 10 controlled by the forming deflector control unit 43, and the beam shape and dimensions can be changed (variable forming).
- the electron beam 6 of the second aperture image that has passed through the second aperture plate 11 is focused by the objective lens 12 and is controlled by the objective deflector control unit 44, for example, by an electrostatic deflector (objective deflector 13).
- the desired position of the substrate 2 on the deflected and movably arranged XY stage 3 is irradiated.
- the XY stage 3 is driven and controlled by the stage control unit 46.
- the position of the XY stage 3 is detected by the stage position detection unit 45.
- the stage position detection unit 45 includes, for example, a laser length measuring device that irradiates the mirror 4 with a laser and measures the position based on the interference between the incident light and the reflected light.
- the electrostatic lens 15 dynamically corrects the focal position of the electron beam 6 in response to the unevenness of the two surfaces of the substrate (dynamic focus).
- FIG. 2 is a diagram for explaining the state of stage movement.
- the XY stage 3 is continuously moved in, for example, the X direction.
- the drawing area is virtually divided into a plurality of strip-shaped stripe areas (SR) with a deflectable width of the electron beam 6.
- the drawing process is performed in units of stripe areas.
- the movement of the XY stage 3 in the X direction is, for example, continuous movement, and at the same time, the shot position of the electron beam 6 is also made to follow the stage movement.
- the drawing time can be shortened by continuously moving the drawing.
- the XY stage 3 is stepped in the Y direction to perform the drawing operation of the next stripe area in the X direction (reverse direction).
- the movement time of the XY stage 3 can be shortened by advancing the drawing operation of each stripe area in a meandering manner.
- the drawing area when processing layout data (drawing data), the drawing area is virtually divided into a plurality of strip-shaped frame areas, and data processing is performed for each frame area.
- the frame area and the stripe area are usually the same area.
- the frame area and the stripe area are displaced according to the multiplicity. In this way, the drawing area of the substrate 2 is virtually divided into frame areas (striped areas) that are a plurality of drawing unit areas, and the drawing unit W draws each frame area (striped area).
- a function ⁇ (d, D exp ) determined from a group of parameters representing the characteristics is obtained in advance and stored in the storage device 21.
- the amount of misalignment of the electron beam on the substrate 2 is calculated based on the amount of charge calculated from this function ⁇ (d, Exp), and the beam irradiation position is corrected.
- the number n p of electrons incident on the resist of a unit area is expressed by the following equation (2) using the elementary charge e.
- the energy of the incident electron beam is high (for example, 50 keV), as shown in FIG. 3a, almost all the incident electrons themselves penetrate the resist layer and the light-shielding film layer (for example, Cr) and are accumulated in the glass layer. ..
- the light-shielding film layer is usually maintained at the ground potential (0 V)
- the electric field generated by the incident electrons is shielded by the light-shielding film layer and does not contribute to the charging effect of the resist.
- the incident electrons pass through the resist layer, they interact with the substances constituting the resist, and ionization occurs in the resist layer.
- the resist layer can be regarded as an equivalent circuit (RC circuit) as shown in FIG. 3b, and the amount of charge accumulated in the capacitor of the equivalent circuit. Is the amount of charge accumulated on the surface of the resist.
- This amount of charge Q (t) can be expressed by the charging formula (4) of a general RC circuit.
- t is the irradiation time of the electron beam
- C is the capacitance per unit area of the resist
- R is the conductivity that appears only when the beam is irradiated due to the EBIC effect.
- I is an electric charge supplied per unit time, and is considered to be a hole supplied by secondary electron withdrawal from the resist.
- the charge I can be replaced by the following equation (5) by using the current density J of the incident electron beam when considered per unit area.
- the secondary electrons generated by the irradiation of the electron beam the secondary electrons having an energy equal to or lower than the surface potential Vs of the resist are attracted back to the resist and contribute to charging. Therefore, it is necessary to consider the number of secondary electrons n rSE accumulated on the resist surface.
- the increase number of secondary electrons dn r SE accumulated in the resist is represented by the following equation (9).
- P (E) of the formula (9) is the generation probability (spectrum) of the secondary electrons of the energy E, and is as shown in the following formula (10).
- the surface potential Vs of the resist can be expressed by the following equation (11) using the amount of charge on the resist surface and the capacitance of the resist.
- the secondary electrons are not attenuated because they are accumulated on the resist surface and are far from the chromium film.
- the function ⁇ (d, D exp ) is expressed by the following equation (15). This utilizes the above equations (2), (8), (12), (13), and (14), and as a group of parameters representing the physical characteristics of the resist, the secondary electron emission probability ⁇ and the resist
- ⁇ dielectric constant
- ⁇ of the resist the resistance
- W of the resist the work function W of the resist
- ⁇ of the holes after attenuation it is a function with the film thickness d of the resist and the dose amount Dexp as variables.
- the secondary electron emission probability ⁇ , the dielectric constant ⁇ , the resistance ⁇ , the work function W, and the residual ratio ⁇ are the irradiation amounts per unit obtained in advance by drawing evaluation on a substrate having at least one type of film thickness. It can be determined by fitting the function ⁇ (d, Dexp ) to the experimental result of the charge amount relationship.
- Substrates provided with the following four types of resists A to D having different film thicknesses or dose sensitivities were prepared, and the relationship between the dose amount and the charge amount was obtained by drawing evaluation and the function ⁇ (d). , Dexp ) was compared with the calculation result.
- Resist A Film thickness 300 nm, dose sensitivity ⁇ 7 ⁇ C / cm 2
- Resist B Film thickness 165 nm, dose sensitivity ⁇ 23 ⁇ C / cm 2
- Resist C Film thickness 80 nm, dose sensitivity ⁇ 60 ⁇ C / cm 2
- Resist D film thickness 80 nm, dose sensitivity ⁇ 100 ⁇ C / cm 2
- FIG. 4a is a diagram showing a test layout used for measuring the resist charging effect.
- the scale is changed in order to make the contents of each part easier to understand.
- an irradiation pad having a pattern density p having a side length L3 of 10 mm is drawn in the center of the layout TL with a dose amount Exp , and the pitch L1 is 200 ⁇ m immediately after drawing the irradiation pad.
- the first box array After drawing the first box array on a grid (81 ⁇ 81 grid) having a side length L2 of 20 mm, and after a sufficient time has elapsed from the drawing of the irradiation pad (for example, 10 minutes later). It is obtained by drawing the second box array on the same grid as the first box array.
- the first box array is, for example, a square pattern having a side length L4 of 4 ⁇ m.
- the second box array is, for example, a frame-shaped pattern having a side length L5 of 14 ⁇ m, which is larger in size than the first box array and has a hollowed out center.
- the displacement distributions P 1 and P 2 from the design position due to the charging effect of the irradiation pad can be obtained. Since P 1 is drawn immediately after the irradiation pad is charged, it is used for evaluation of the charge amount immediately after irradiation, and P 2 is used for evaluation of the charge amount after attenuation because it is drawn after a sufficient time after the irradiation pad is charged. be able to.
- FIG. 5 is an example of the displacement amount distribution obtained by evaluating such a test layout.
- the charge amount can be obtained from the misalignment amount distribution as follows.
- FIG. 6 shows the distribution of the misalignment amount P 0 obtained by the above equation.
- the charge amount of the irradiation amount pad can be obtained from the inclination when P 0 is correlated with P 1 and P 2 which are the measurement results, respectively.
- Figure 7a, Figure 7b is a graph showing the correlation between P 1 and P 2 and P 0 at the time of irradiation with the irradiation pad pattern density of 25% at a dose of 23 ⁇ C / cm 2.
- the slopes are obtained as 1.57 and 0.75, respectively.
- the misalignment of P 1 and P 2 is equivalent to the misalignment of the model when the irradiation pad is charged at 1 nC / cm 2 by 1.57 times and 0.75 times, respectively. It can be seen that the irradiation pad is charged with 1.57 nC / cm 2 and 0.75 nC / cm 2.
- FIGS. 8a to 8d The comparison result between the result obtained by the drawing evaluation and the calculation result by the function ⁇ (d, Exp ) is shown in FIGS. 8a to 8d.
- the horizontal axis of the graph in each figure shows the dose amount, and the vertical axis shows the charge amount.
- the markers in the graphs of each figure show the results obtained by drawing evaluation, and the solid lines show the calculated values by the function ⁇ (d, Exp).
- the charge amount indicated by the marker is a value obtained by the above drawing evaluation by variously changing the pattern density p and the dose amount D exp on each substrate, and the horizontal axis is D exp * p. It is plotted as.
- a square marker indicates immediately after drawing, and a triangular marker indicates after attenuation. From this result, it can be confirmed that if the physical characteristics of the resist do not change, the charge amount can be calculated accurately by the function ⁇ (d, Exp ) determined by the same parameter group even if the film thickness and sensitivity of the resist change. rice field.
- the resist is composed of a base polymer and a small amount of a dissolution inhibitor / acid generator, and most of the volume of the resist is occupied by the base polymer. It is considered that the physical characteristics of the resist are determined only by the characteristics of the polymer. Therefore, the charge amount could be calculated by a function determined by the same parameter for four types of substrates having different sensitivities. That is, in the present embodiment, unless there is a significant change in the polymer composition such as the secondary electron emission probability ⁇ , the dielectric constant ⁇ , and the work function W that change the physical characteristics of the resist, the film thickness of the resist is changed or the acid is used. For various substrates whose sensitivity is changed by changing the concentration of additives such as generators, the amount of charge can be calculated quickly and accurately using the function ⁇ (d, Exp) using the same parameters.
- the storage device 21 of the drawing device 100 shown in FIG. 1 stores in advance a function ⁇ (d, Exp ) and a parameter group indicating the physical characteristics of the resist formed on the substrate 2.
- FIG. 9 is a flowchart illustrating a drawing method according to the present embodiment.
- This method includes a pattern density distribution calculation step (step S100), a dose amount distribution calculation step (step S102), a charge amount distribution calculation step (step S104), a misalignment amount distribution calculation step (step S106), and a deflection. It has a position correction step (step S108) and a drawing step (step S110).
- the pattern density distribution calculation unit 32 reads drawing data from the storage device 140, virtually divides the drawing area (or frame area) into mesh shapes with predetermined dimensions (grid dimensions), and then virtually divides the drawing area (or frame area) into meshes. For each mesh area, the pattern density indicating the arrangement ratio of the graphic pattern defined in the drawing data is calculated. Then, the distribution of the pattern density for each mesh region is created.
- the dose amount distribution calculation unit 34 calculates the distribution of the dose amount Dexp for each mesh region using the pattern density distribution.
- the dose amount D exp can be calculated by the above formula (1).
- step S104 Charge amount distribution calculating step in (step S104), and the charge amount distribution calculation unit 36, a function sigma (d, D exp) from the storage device 21 and reads the parameter group, the function sigma set the parameter group (d, D exp) By substituting the film thickness d of the resist formed on the substrate 2 and the dose amount Function calculated in step S102, the distribution of the charge amount for each mesh region is calculated.
- the misalignment amount distribution calculation unit 38 calculates the misalignment amount based on the charge amount distribution. Specifically, the misalignment amount distribution calculation unit 38 convolves and integrates the response function r (x, y) with the charge amount distribution calculated in step S104, resulting in the charge amount at each position of the charge amount distribution. Calculate the amount of misalignment of the drawing position.
- a response function r (x, y) that converts this charge amount distribution into a misalignment amount distribution.
- the charging position indicated by each position of the charging amount distribution is represented by (x', y')
- the beam irradiation position of the corresponding frame region currently undergoing data processing is represented by (x, y).
- the response function is r (xx', y'). It can be described as -y').
- the response function r (xx', y-y') may be obtained by conducting an experiment in advance and obtaining it in advance so as to match the experimental result, or by numerical calculation.
- (x, y) indicates the beam irradiation position of the corresponding frame region in which data processing is currently being performed.
- the misalignment amount distribution calculation unit 38 creates a misalignment amount distribution from the misalignment amount of each position (x, y) to be drawn in the corresponding frame area.
- the created misalignment amount distribution is stored in the storage device 21 and output to the control computer 120.
- the shot data generation unit 41 reads the drawing data from the storage device 140, performs a plurality of stages of data conversion processing, and generates shot data in a format unique to the drawing device 100.
- the size of the graphic pattern defined in the drawing data is usually larger than the shot size that the drawing apparatus 100 can form in one shot. Therefore, in the drawing device 100, each figure pattern is divided into a plurality of shot figures so that the drawing device 100 has a size that can be formed by one shot (shot division). Then, for each shot figure, data such as a figure code indicating a figure type, coordinates, and size are defined as shot data.
- step S108 position shift correction step
- the position shift correction unit 42 corrects the irradiation position using the position shift amount calculated in step S106.
- the shot data at each position is corrected.
- a correction value for correcting the misalignment amount indicated by the misalignment amount distribution is added to each position (x, y) of the shot data.
- the correction value for example, it is preferable to use a value obtained by reversing the positive and negative signs of the misalignment amount indicated by the misalignment amount distribution.
- Shot data is defined in the data file so that it is arranged in shot order.
- the forming deflector control unit 43 variably forms the electron beam 6 from the figure type and size defined in the shot data for each shot figure in the shot order.
- the amount of deflection of the molding deflector 10 of the above is calculated.
- the objective deflector control unit 44 calculates the amount of deflection of the objective deflector 13 for deflecting to a position on the substrate 2 to irradiate the shot figure. In other words, the objective deflector control unit 44 (deflection amount calculation unit) calculates the deflection amount that deflects the electron beam to the corrected irradiation position.
- the objective deflector 13 arranged in the electron barrel 1 deflects the electron beam according to the calculated deflection amount, so that the electron beam is irradiated to the corrected irradiation position.
- the drawing unit W draws the pattern at the charge-corrected position of the substrate 2.
- the film thickness of the resist can be changed, or additives such as an acid generator and a photodegradable base can be added.
- the charge amount can be calculated quickly and accurately using the same function ⁇ (d, Dexp ) for a substrate whose sensitivity is changed by changing the concentration. As a result, the downtime of the device due to the board change can be shortened.
- the changed resist film thickness may be substituted into the function ⁇ (d, Exp).
- the resist film thickness is measured periodically, and the resist film of the currently used substrate is based on the change in the resist film thickness of the substrate used in the past.
- the thickness may be predicted and the predicted value may be substituted into the function ⁇ (d, Dexp).
- the film thickness distribution is measured in advance, and the film thickness at the position where the charge amount is calculated is substituted into the function ⁇ (d, Exp). May be good.
- the drawing device may be provided with a measuring device for measuring the thickness of the resist.
- the deviation of the irradiation position due to the charging phenomenon is not limited to the electron beam drawing device.
- the present invention can be applied to a charged particle beam device that uses the result obtained by irradiating a charged particle beam at a target position, such as an inspection device that inspects a pattern with a charged particle beam such as an electron beam.
- the lower surface of the objective lens 12 (objective optical system) is covered so that the influence of the fog charge that the electrons scattered in the drawing chamber falls on the substrate is reduced and the direct charge by the irradiated electron beam becomes dominant. It is preferable to apply a positive potential so as not to return secondary electrons to the surface of the substrate.
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Abstract
Description
=αJρε{1-exp(-enp/Jρε)}/e
レジストB:膜厚165nm、ドーズ感度~ 23μC/cm2
レジストC:膜厚 80nm、ドーズ感度~ 60μC/cm2
レジストD:膜厚 80nm、ドーズ感度~100μC/cm2
α=0.036
ρ=13.6[Ωm]
β=0.65
ε=3.1*ε0(比誘電率3.1、ε0:真空の誘電率)
W=3.0[eV]
本出願は、2020年4月27日付で出願された日本特許出願2020-78344に基づいており、その全体が引用により援用される。
2 基板
3 XYステージ
4 ミラー
5 電子銃
6 電子ビーム
7 照明レンズ
8 第1アパーチャプレート
9 投影レンズ
10 偏向器
11 第2アパーチャプレート
12 対物レンズ
13 偏向器
14 描画室
15 静電レンズ
21,140 記憶装置
30 描画制御部
32 パターン密度分布算出部
34 ドーズ量分布算出部
36 帯電量分布算出部
38 位置ずれ量分布算出部
41 ショットデータ生成部
42 位置ずれ補正部
43 成形偏向器制御部
44 対物偏向器制御部
45 ステージ位置検出部
46 ステージ制御部
100 描画装置
Claims (10)
- 荷電粒子ビームを偏向器により偏向させ、レジスト膜が形成された基板に前記荷電粒子ビームを照射してパターンを描画する荷電粒子ビーム描画方法であって、
前記基板の描画領域をメッシュ状に仮想分割し、メッシュ領域毎の前記パターンの配置割合を示すパターン密度を算出する工程と、
前記パターン密度を用いてメッシュ領域毎のドーズ量を算出する工程と、
予め求められた前記レジスト膜の膜厚とドーズ量とを変数とする帯電量算出用の関数を用い、前記基板に形成された前記レジスト膜の膜厚、及び算出した前記ドーズ量より帯電量を算出する工程と、
算出した前記帯電量から描画位置の位置ずれ量を算出する工程と、
前記位置ずれ量を用いて、前記荷電粒子ビームの照射位置を補正する工程と、
を備える荷電粒子ビーム描画方法。 - 前記帯電量算出用の関数は、前記レジスト膜の物理特性を表すパラメータから決定され、物理特性は、レジストの二次電子放出確率、誘電率、ビーム照射中の抵抗率、仕事関数、及び正孔残存率の少なくともいずれかを含むことを特徴とする請求項1に記載の荷電粒子ビーム描画方法。
- 前記帯電量算出用の関数は、前記レジスト膜のドーズ感度に依存しないことを特徴とする請求項2に記載の荷電粒子ビーム描画方法。
- 前記基板に形成された前記レジスト膜の膜厚分布と前記帯電量算出用の関数とに基づき帯電量を算出することを特徴とする請求項1に記載の荷電粒子ビーム描画方法。
- レジスト膜厚を定期的に測定し、
過去にパターンを描画した基板のレジスト膜厚の変化に基づいて、描画対象の基板のレジスト膜厚を予測し、
レジスト膜厚の予測値と前記帯電量算出用の関数とに基づいて帯電量を算出することを特徴とする請求項1に記載の荷電粒子ビーム描画方法。 - 荷電粒子ビームを偏向器により偏向させ、レジスト膜が形成された基板に前記荷電粒子ビームを照射してパターンを描画する荷電粒子ビーム描画装置であって、
前記荷電粒子ビームを放出する放出部と、
前記基板の描画領域をメッシュ状に仮想分割し、メッシュ領域毎の前記パターンの配置割合を示すパターン密度を算出するパターン密度算出部と、
前記パターン密度を用いてメッシュ領域毎のドーズ量を示すドーズ量を算出するドーズ量算出部と、
前記レジスト膜の膜厚とドーズ量とを変数とする帯電量算出用の関数を記憶する記憶部と、
前記記憶部から前記関数を取り出し、前記関数を用い、前記基板に形成された前記レジスト膜の膜厚、及び前記ドーズ量算出部により算出されたドーズ量より帯電量を算出する帯電量算出部と、
前記帯電量から描画位置の位置ずれ量を算出する位置ずれ量算出部と、
前記位置ずれ量を用いて、前記荷電粒子ビームの照射位置を補正する補正部と、
前記補正された照射位置に前記荷電粒子ビームを照射する描画部と、
を備える荷電粒子ビーム描画装置。 - 前記帯電量算出用の関数は、前記レジスト膜の物理特性を表すパラメータから決定され、物理特性は、レジストの二次電子放出確率、誘電率、ビーム照射中の抵抗率、仕事関数、及び正孔残存率の少なくともいずれかを含むことを特徴とする請求項6に記載の荷電粒子ビーム描画装置。
- 前記帯電量算出用の関数は、前記レジスト膜のドーズ感度に依存しないことを特徴とする請求項7に記載の荷電粒子ビーム描画装置。
- 前記帯電量算出部は、前記基板に形成された前記レジスト膜の膜厚分布と前記帯電量算出用の関数とに基づき帯電量を算出することを特徴とする請求項6に記載の荷電粒子ビーム描画装置。
- 前記帯電量算出部は、過去にパターンを描画した基板のレジスト膜厚の変化に基づいて、描画対象の基板のレジスト膜厚を予測し、レジスト膜厚の予測値と前記帯電量算出用の関数とに基づいて帯電量を算出することを特徴とする請求項6に記載の荷電粒子ビーム描画装置。
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TWI807295B (zh) | 2023-07-01 |
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