WO2025157014A1 - 晶圆刻蚀或沉积及模型获取方法、半导体工艺设备 - Google Patents
晶圆刻蚀或沉积及模型获取方法、半导体工艺设备Info
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- WO2025157014A1 WO2025157014A1 PCT/CN2025/071453 CN2025071453W WO2025157014A1 WO 2025157014 A1 WO2025157014 A1 WO 2025157014A1 CN 2025071453 W CN2025071453 W CN 2025071453W WO 2025157014 A1 WO2025157014 A1 WO 2025157014A1
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- etching
- temperature control
- deposition rate
- distribution data
- temperature
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/06—Apparatus for monitoring, sorting, marking, testing or measuring
- H10P72/0602—Temperature monitoring
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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
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32715—Workpiece holder
- H01J37/32724—Temperature
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/04—Apparatus for manufacture or treatment
- H10P72/0402—Apparatus for fluid treatment
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/04—Apparatus for manufacture or treatment
- H10P72/0402—Apparatus for fluid treatment
- H10P72/0418—Apparatus for fluid treatment for etching
- H10P72/0421—Apparatus for fluid treatment for etching for drying etching
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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
- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/332—Coating
-
- 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
- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/334—Etching
Definitions
- the present application belongs to the field of semiconductor technology, specifically to the field of temperature control technology of multi-temperature zone electrostatic chucks or heating bases, and more specifically to a wafer etching or deposition method, a method for obtaining an etching or deposition rate prediction model, and semiconductor process equipment.
- Advanced integrated circuit manufacturing processes typically consist of thousands of steps, including etching, deposition, and cleaning.
- Etching as a critical step, determines the critical dimensions of semiconductor devices and ultimately impacts their performance.
- Etch rate and etch uniformity are key parameters of concern in semiconductor processing.
- the etch rate is typically adjusted by adjusting the temperature of each temperature control zone on the wafer carrier to ensure uniform etching across the wafer.
- the changed etching rate is predicted based on the temperature sensitivity and the temperature difference before and after the change.
- the etching rate distribution data predicted by this method there is a large deviation between the etching rate distribution data predicted by this method and the actually measured etching rate distribution data.
- Embodiments of the present application disclose a wafer etching or deposition method, a method for obtaining an etching or deposition rate prediction model, and semiconductor process equipment to solve the problem of large deviation between the predicted value and the measured value of etching or deposition rate distribution data in related technologies.
- an embodiment of the present application discloses a wafer etching or deposition method, which is applied to a process chamber having a wafer carrier, wherein the wafer carrier surface of the wafer carrier has multiple main temperature control zones and multiple auxiliary temperature control zones, the multiple main temperature control zones are arranged in sequence in the radial direction of the wafer carrier surface, the main temperature control zones located on the outside in the radial direction are arranged around the main temperature control zones located on the inside in the radial direction, and the multiple auxiliary temperature control zones are arranged along the angular direction of the wafer carrier, and the method includes:
- the target temperature control value of each main temperature control zone is obtained according to the first target etching or deposition rate distribution data, the first basic etching or deposition rate distribution data and the temperature sensitivity value; wherein the first etching or deposition rate prediction model is associated with the diffusion of radial etching by-products or deposits generated during the etching or deposition process, and the first etching or deposition rate prediction model is used to characterize the correspondence between the etching or deposition rate of each position in the radial direction on the wafer carrying surface and the associated position, and the first target etching or deposition rate distribution data includes multiple target etching or deposition rate values associated with the radial positions on the wafer carrying surface.
- an embodiment of the present application discloses a wafer etching or deposition method, the method being applied to a process chamber having a wafer carrier, wherein a wafer carrier surface of the wafer carrier has multiple temperature control zones, the method comprising:
- the basic etching or deposition rate distribution data includes a plurality of etching or deposition rate values associated with positions on the wafer supporting surface, and the temperature sensitivity value is used to characterize the rate of change of the etching or deposition rate with temperature;
- target temperature control values for each of the temperature control zones are obtained based on target etching or deposition rate distribution data, the basic etching or deposition rate distribution data, and the temperature sensitivity value; wherein the etching or deposition rate prediction model is associated with the diffusion of etching byproducts or deposits generated during the etching or deposition process, and the etching or deposition rate prediction model is used to characterize the correspondence between the etching or deposition rate of each position on the wafer carrying surface and the associated position, and the target etching or deposition rate distribution data includes a plurality of target etching or deposition rate values associated with positions on the wafer carrying surface.
- an embodiment of the present application discloses a wafer etching or deposition method, the method being applied to a process chamber having a wafer carrier, wherein a wafer carrier surface of the wafer carrier has multiple temperature control zones, the method comprising:
- the basic etching or deposition rate distribution data includes a plurality of etching or deposition rate values associated with positions on the wafer supporting surface, and the temperature sensitivity value is used to characterize the rate of change of the etching or deposition rate with temperature;
- a preset etching or deposition rate prediction model is used to obtain a target temperature control value for each of the temperature control zones based on the target etching or deposition rate distribution data, the basic etching or deposition rate distribution data, and the temperature sensitivity distribution data; wherein the etching or deposition rate prediction model is used to characterize that when the temperature control value of any of the temperature control zones changes, all positions on the wafer carrying surface are affected by the changed temperature control zone, and the corresponding relationship between the etching or deposition rate of each position after the change and the corresponding position; the target etching or deposition rate distribution data includes multiple target etching or deposition rate values associated with positions on the wafer carrying surface.
- an embodiment of the present application discloses a method for obtaining an etching or deposition rate prediction model, the method being applied to a process chamber having a wafer carrier, wherein a wafer carrier surface of the wafer carrier has multiple temperature control zones, the method comprising:
- the basic etching or deposition rate distribution data includes a plurality of etching or deposition rate values associated with positions on the wafer supporting surface, and the temperature sensitivity value is used to characterize the rate of change of the etching or deposition rate with temperature;
- etching or deposition rate prediction sub-model for the changed temperature control zone, wherein the etching or deposition rate prediction sub-model is related to the basic etching or deposition rate distribution data, the changed etching or deposition rate distribution data, the basic temperature, the temperature control value of the changed temperature control zone, and the temperature sensitivity value;
- the etching or deposition rate prediction model is obtained according to the etching or deposition rate prediction sub-models of each of the temperature control zones.
- an embodiment of the present application discloses a wafer etching or deposition method, the method being applied to a process chamber having a wafer carrier, wherein a wafer carrier surface of the wafer carrier has multiple temperature control zones, the method comprising:
- the basic etching or deposition rate distribution data includes a plurality of etching or deposition rate values associated with positions on the wafer supporting surface, and the temperature sensitivity value is used to characterize the rate of change of the etching or deposition rate with temperature;
- the target temperature control value of each temperature control zone is obtained based on the target etching or deposition rate distribution data, the basic etching or deposition rate distribution data, and the temperature sensitivity value; wherein the target etching or deposition rate distribution data includes a plurality of target etching or deposition rate values associated with positions on the wafer carrying surface.
- an embodiment of the present application discloses a wafer etching or deposition method, the method being applied to a process chamber having a wafer carrier, wherein a wafer carrier surface of the wafer carrier has a plurality of main temperature control zones and a plurality of auxiliary temperature control zones, wherein the plurality of main temperature control zones are sequentially arranged in a radial direction of the wafer carrier surface, the main temperature control zones located on the outside in the radial direction are arranged around the main temperature control zones located on the inside in the radial direction, and the plurality of auxiliary temperature control zones are arranged along the angular direction of the wafer carrier, the method comprising:
- the target temperature control value of each main temperature control zone is obtained according to the first target etching or deposition rate distribution data, the first basic etching or deposition rate distribution data and the temperature sensitivity value; wherein the first target etching or deposition rate distribution data includes multiple target etching or deposition rate values associated with the radial position on the wafer carrying surface.
- an embodiment of the present application discloses a semiconductor process equipment, including:
- a wafer carrying device is arranged in the process chamber, and a wafer carrying surface of the wafer carrying device has multiple temperature control zones;
- the control device includes at least one processor and at least one memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the method described in any one of the first to sixth aspects above is implemented.
- an embodiment of the present application discloses a semiconductor process equipment, including:
- a wafer carrying device is arranged in the process chamber, and a wafer carrying surface of the wafer carrying device has multiple temperature control zones;
- the control device includes at least one processor and at least one memory, wherein the memory stores the etching or deposition rate prediction model obtained by the method described in the fourth aspect.
- the wafer etching or deposition method of the embodiment of the present application by adopting an etching or deposition rate prediction model associated with the diffusion of etching by-products or deposits generated during the etching or deposition process, compared with the etching rate prediction model in the related art that is only associated with temperature sensitivity, it is possible to compensate for the influence of the diffusion of etching by-products or deposits on the etching or deposition rate distribution, so that the etching or deposition rate distribution data of each position on the wafer at any target temperature in each temperature control zone can be more accurately predicted, or the target temperature control value of each temperature control zone can be more accurately calculated based on the target etching or deposition rate distribution data.
- the uniformity of wafer etching or deposition can be improved, or the desired morphology can be obtained on the wafer surface.
- FIG. 1 and 2 are schematic top views of a wafer carrier according to an embodiment of the present application.
- 3A and 3B respectively show a cross-sectional view and a top view of a wafer carrier according to another embodiment of the present application
- FIG4 shows the etching rate distribution data predicted by the related technology and the etching rate distribution data actually measured
- FIG5 is a schematic diagram showing the diffusion mechanism of etching byproducts according to an embodiment of the present application.
- FIG6 shows a flow chart of a wafer etching method according to an embodiment of the present application
- FIG7 shows a flow chart of a method for obtaining an etching rate prediction model according to an embodiment of the present application
- FIG8 shows an etch rate prediction sub-model using smooth curve fitting in the first temperature control zone
- FIG9 shows the etching rate distribution data predicted by the etching rate prediction model according to an embodiment of the present application and the actually measured etching rate distribution data
- FIG10 shows a flow chart of a wafer etching method according to another embodiment of the present application.
- FIG11 shows a flow chart of a method for obtaining an etching rate prediction model according to another embodiment of the present application.
- FIG12 shows a schematic diagram of a semiconductor process equipment according to an embodiment of the present application.
- the terms “upper,” “right,” “left,” “vertical,” “horizontal,” “top,” “bottom,” and their derivatives shall relate to the orientation of the structures and methods disclosed in the drawings of the specification. It will be understood that when an element as a layer, region, or substrate is referred to as being “on” another element, the element can be directly on the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements between the two. It will also be understood that when an element is referred to as being “under” another element, the element can be directly under the other element or intervening elements may be present. Conversely, when an element is referred to as being “directly under” another element, there are no intervening elements between the two.
- FIGS 1 and 2 respectively show a top schematic diagram of a wafer carrying device according to an embodiment of the present application.
- the wafer carrying device may be, for example, a multi-zone electrostatic chuck or a heating base, and its wafer carrying surface may have multiple temperature control zones.
- the wafer carrying device has four temperature control zones, namely, a first temperature control zone 11, a second temperature control zone 12, a third temperature control zone 13 and a fourth temperature control zone 14 arranged in sequence from the inside to the outside in the radial direction.
- the first temperature control zone 11 is a circular area located at the center of the wafer carrying surface, and the second temperature control zone 12, the third temperature control zone 13 and the fourth temperature control zone 14 are annular areas arranged sequentially around the first temperature control zone 11 from the inside to the outside, that is, the second temperature control zone 12 is arranged around the first temperature control zone 11, the third temperature control zone 13 is arranged around the second temperature control zone 12, and the fourth temperature control zone 14 is arranged around the third temperature control zone 13.
- the wafer carrying device has 9 temperature control zones, namely, a first temperature control zone 21 located at the center of the wafer carrying surface, a second temperature control zone 22, a third temperature control zone 23, a fourth temperature control zone 24 and a fifth temperature control zone 25 distributed around the first temperature control zone 21, and a sixth temperature control zone 26, a seventh temperature control zone 27, an eighth temperature control zone 28 and a ninth temperature control zone 29 distributed around the second to fourth temperature control zones.
- 3A and 3B show schematic diagrams of a wafer carrier device according to another embodiment of the present application, which wafer carrier device may include, for example, a base 31, a heating layer 32, and an electrostatic chuck 33.
- the heating layer 32 includes a plurality of main heaters corresponding to the main temperature control zones 34 and a plurality of auxiliary heaters corresponding to the auxiliary temperature control zones 35.
- the plurality of main temperature control zones 34 are arranged in sequence in the radial direction.
- the main temperature control zones 34 located on the outer side of the radial direction are arranged around the main temperature control zones 34 located on the inner side of the radial direction.
- the plurality of auxiliary temperature control zones 35 are arranged along the angular direction of the wafer carrier device to locally adjust the temperature on the wafer carrier surface, for example, to adjust the uniformity of the wafer carrier surface in the angular direction.
- the main heater corresponding to the main temperature control zone 34 is located above the auxiliary heater corresponding to the auxiliary temperature control zone 35.
- the main heater corresponding to the main temperature control zone 34 may also be located below the auxiliary heater corresponding to the auxiliary temperature control zone 35.
- the electrostatic chuck 33 includes an adsorption electrode 36 to provide an electrostatic adsorption force to the wafer on the wafer supporting surface.
- the adsorption electrode 36 can be set as a unipolar or bipolar electrode, or other suitable settings, and this application does not impose any limitation on this.
- Figures 1, 2, 3A, and 3B are merely examples, and more or fewer temperature control zones are feasible.
- the temperature control zones can be regularly or irregularly arranged on the wafer carrying surface, and this application does not impose any restrictions on this.
- the plasma generated by the RF source may be unevenly distributed due to various reasons. It is necessary to adjust the temperature of each temperature control zone of the wafer carrying device to compensate for the etching rate difference caused by the uneven distribution of plasma, thereby ensuring the uniformity of wafer etching.
- etching rate distribution data [ER] H and [ER] L are first obtained for each position of the etched wafer when the temperature of each temperature control zone of the wafer carrier is at a high temperature TH and a low temperature TL . It should be noted that [ER] H and [ER] L are used herein to represent the etching rate distribution data, and the brackets [] are only intended to indicate that multiple etching rate values associated with the position are included.
- [ER] H [ ER0 , ER1 , ..., ER15 ]
- ER0 represents the etching rate value at a position 0 mm from the center of the circle as the origin
- ER1 represents the etching rate value at a position 10 mm from the center of the circle as the origin
- a temperature sensitivity value [Sen] is obtained as [ER] H - [ER] L /( TH - TL ), that is, the rate of change of multiple position-associated etch rates with temperature is calculated.
- the etch rate distribution data [ER] target at any target temperature [T] target can be predicted based on the temperature sensitivity value, or the target temperature control value of each temperature control zone can be calculated based on the target etch rate distribution data according to this formula.
- [ER] target [ER] base + ([T] target - [T] base ) ⁇ [Sen]
- [ER] base is the etch rate distribution data of each position when the temperature of each temperature control zone of the wafer carrier is at the base temperature Tbase
- [T] target - [T] base represents the subtraction of the target temperature of the corresponding temperature control zone from the base temperature, such as the subtraction of the target temperature from the base temperature of each temperature control zone shown in Figures 1 or 2 or 3A and 3B. This expression will be used hereinafter.
- the inventors of this application discovered that the etch rate distribution data predicted using the aforementioned related technologies deviated significantly from the actually measured etch rate distribution data.
- the basic etch rate distribution data [ER] base in the radial direction at a base temperature [T] base [60, 60, 60, 60] was collected, along with the temperature sensitivity value of the process.
- the etch rate distribution data in the radial direction at [T] target [60, 63, 65, 58] was predicted using the etch rate prediction model of the related technology and compared with the actually measured etch rate distribution data.
- the hollow circles in FIG4 represent the predicted values, while the solid circles represent the actually measured values. There was a significant deviation between the two. Therefore, the aforementioned related technologies cannot accurately predict the etch rate distribution data, and accordingly, the target temperature control values for each temperature control zone cannot be accurately obtained based on the target etch rate distribution data.
- the inventors of this application have conducted in-depth research on the plasma etching mechanism.
- various etching by-products will be continuously produced.
- the etching by-products accumulate more, the deposition effect will be aggravated, causing the etching rate to decrease; when the etching by-products accumulate less, the deposition effect will be weakened, etching will be more likely to occur, and the etching rate will increase.
- the inventors of this application found that when the surface temperature of the wafer carrier is different, the etching by-products will diffuse from the high temperature zone to the low temperature zone along the temperature gradient, as shown in Figure 5, that is, the etching by-products accumulated in the high temperature zone will be less than the etching by-products accumulated in the low temperature zone, which will cause the overall etching rate to change.
- the above-mentioned related technologies do not take into account the influence of the diffusion of etching by-products, so the predicted etching rate distribution data will deviate from the actually measured etching rate distribution data.
- an embodiment of this application provides a wafer etching method.
- This method is applied to a process chamber having a wafer carrier, wherein the wafer carrier surface of the wafer carrier has multiple temperature control zones.
- the wafer carrier can be, for example, a multi-temperature zone electrostatic chuck or a heating pedestal.
- This method can be executed by a control device of semiconductor process equipment, such as a host computer or a slave computer of the semiconductor process equipment. As shown in Figure 6, this method can include the following steps:
- the basic etch rate distribution data includes multiple etch rate values associated with locations on the wafer support surface, and the temperature sensitivity value is used to characterize the rate of change of the etch rate with temperature.
- the basic etch rate distribution data and the temperature sensitivity value can be pre-stored in the memory of a control device of the semiconductor process equipment.
- the basic etch rate distribution data is associated with each location on the two-dimensional plane of the wafer support surface.
- Tbase When the base temperature of each temperature control zone is Tbase , multiple basic etch rates [ER]base associated with locations on the wafer support surface can be collected.
- the temperature sensitivity value can be a single value or multiple values associated with locations on the wafer support surface, as will be described in detail below.
- [ER] target represents the target etch rate distribution data
- [M] represents the etch rate prediction model
- [ER] base represents the basic etch rate distribution data
- [Sen] represents the temperature sensitivity value
- [T] target represents the target temperature control value for each temperature control zone
- T base represents the base temperature.
- [M], [ER] base , [Sen], and T base are all known values.
- [ER] target is a known value
- [T] target can be obtained based on the above functional relationship.
- the etching rate prediction model [M] is associated with the diffusion of etching by-products generated during the etching process.
- the etching rate prediction model [M] is used to characterize the correspondence between the etching rate of each position on the wafer carrier surface and the associated position.
- the target etching rate distribution data [ER] target includes multiple target etching rate values associated with the positions on the wafer carrier surface.
- the etch rate prediction model [M] can be pre-stored in the memory of the control device of the semiconductor process equipment.
- the etch rate prediction model [M] is normalized with respect to the temperature sensitivity value, thereby being universally applicable to various wafers to be etched.
- the etch rate prediction model of the embodiments of the present application is applicable to the etching of various materials such as single crystal silicon, polycrystalline silicon, and silicon oxide, without the need to change the model for different etching processes.
- the etch rate prediction model will be further described in detail below.
- the wafer etching method of the embodiment of the present application by adopting an etching rate prediction model associated with the diffusion of etching by-products generated during the etching process, compared with the etching rate prediction model associated only with temperature sensitivity in the related art, it is possible to compensate for the influence of the diffusion of etching by-products on the etching rate distribution, so that the etching rate distribution data of each position on the wafer at any target temperature of each temperature control zone can be more accurately predicted, or the target temperature control value of each temperature control zone can be more accurately calculated based on the target etching rate distribution data. That is, by using the wafer etching method of the embodiment of the present application to control the temperature of each temperature control zone of the wafer carrier device, the uniformity of wafer etching can be improved, or the desired morphology of the wafer surface can be obtained.
- the temperature control method for multiple temperature control zones in the embodiment of the present application can be applied not only to etching processes, but also to deposition processes.
- deposition processes when the surface temperature of the wafer carrier is different, the sediment will diffuse from the high temperature zone to the low temperature zone along the temperature gradient, that is, the sediment accumulated in the high temperature zone will be less than the sediment accumulated in the low temperature zone. Therefore, when the temperature of a certain temperature control zone changes, it will not only affect the deposition rate of the temperature control zone where the temperature changes, but also affect the deposition rate of all positions on the wafer carrier surface.
- the embodiment of the present application also provides a wafer deposition method, which may include the following steps:
- the wafer deposition method of the embodiment of the present application by adopting a deposition rate prediction model associated with the diffusion of sediments during the deposition process, compared with the deposition rate prediction model in the related art that is only associated with temperature sensitivity, it is possible to compensate for the impact of sediment diffusion on the deposition rate distribution. Therefore, it is possible to more accurately predict the deposition rate distribution data of each position on the wafer at any target temperature in each temperature control zone, or to more accurately calculate the target temperature control value of each temperature control zone based on the target deposition rate distribution data.
- the etch rate prediction model is associated with an etch rate prediction sub-model for each temperature control zone.
- Each etch rate prediction sub-model is used to characterize the corresponding relationship between the etch rate of each position on the wafer support surface and the associated position when the temperature control value of the corresponding temperature control zone changes.
- a method for obtaining the etching rate prediction model may include the following steps:
- the temperature control value of the innermost first temperature control zone 11 is changed to 65°C, and the temperature control value of the other temperature control zones remains at 60°C.
- the temperature of the wafer carrier is [65, 60, 60, 60].
- the etching rate distribution data of each position on the wafer carrier surface after the change is detected.
- etching rate prediction sub-model [M] sub can be expressed as follows:
- the temperature sensitivity value [Sen] can be expressed as follows:
- [ER] 2 represents the etching rate distribution data when the temperature control values of all temperature control zones of the wafer carrier are all T 2 .
- the temperature control value of the innermost first temperature control zone 11 may be changed to 65°C which is greater than the basic temperature.
- the temperature value may also be changed to a temperature control value which is less than the basic temperature, such as 55°C.
- the temperature sensitivity value can also be obtained according to the above formula (2).
- the obtained distribution data should be associated with each position on the two-dimensional plane, rather than only with the radial position.
- the radial direction data calculated according to the above formula (1) is shown as the dots in Figure 8, thereby obtaining the etching rate prediction sub-model [M] 1 of the innermost first temperature control zone 11.
- the etching rate prediction sub-model is used to characterize the corresponding relationship between the etching rate of each position on the wafer support surface and the associated position when the temperature control value of the corresponding first temperature control zone 11 changes.
- a smooth curve can be used to fit the data calculated by the above formula (1) as shown in Figure 8, so that the etching rate corresponding to any position can be obtained based on the smooth curve.
- the etching rate of each position in the radial direction will change due to the influence of the diffusion of etching by-products.
- a piecewise function can be further used to characterize the above-mentioned smooth curve, so that the control device of the semiconductor device can conveniently obtain the etching rate corresponding to any position based on the piecewise function.
- a neural network model can also be obtained by training the data calculated by the above formula (1), so that the control device of the semiconductor device can conveniently obtain the etching rate corresponding to any position based on the neural network model.
- step S24 Determine whether the etching rate prediction sub-models of all temperature control zones have been obtained. When the etching rate prediction sub-models of all temperature control zones have not been obtained, return to step S22 to obtain the etching rate prediction sub-model of the next temperature control zone; when the etching rate prediction sub-models of all temperature control zones have been obtained, execute step S25.
- the etching rate prediction sub-model of all temperature control areas can be obtained.
- the etching rate prediction model can be expressed by the following formula:
- [ER] target represents the target etch rate distribution data when each temperature control zone of the wafer carrier is at the corresponding target temperature control value
- [ER] base represents the basic etch rate distribution data when the temperature control value of all temperature control zones of the wafer carrier is T base
- [Sen] represents the temperature sensitivity value
- T target1 represents the target temperature control value of the first temperature control zone
- T target2 represents the target temperature control value of the second temperature control zone
- T targetn represents the target temperature control value of the nth temperature control zone
- [M] 1 represents the etch rate prediction submodel of the first temperature control zone
- [M] 2 represents the etch rate prediction submodel of the second temperature control zone
- [M] n represents the etch rate prediction submodel of the nth temperature control zone.
- [Sen], [M] 1 , [M] 2 , [M] 3 , [M] 4 , and T base are all known data and can be pre-stored in the memory of the control device of the semiconductor process equipment.
- T target1 , T target2 , T target3 , and T target4 are all known values.
- Substituting these known values into formula (4) can obtain the value of [ER] target , that is, the target etching rate distribution data of each temperature control zone at the target temperature control value.
- [ER] target is known data.
- Substituting [ER] target into formula (4) can calculate the values of T target1 , T target2 , T target3 , and T target4 , that is, the target temperature control value of each temperature control zone.
- the basic etching rate distribution data [ER] base in the radial direction of the process at the basic temperature [T] base [60,60,60,60] is collected, and the temperature sensitivity value [Sen] is collected at the same time.
- the hollow circles in the figure represent the predicted values, and the solid circles represent the measured values. It can be seen that the two basically coincide, and the predicted deviation is within 2%, which is much better than the related technology shown in Figure 4.
- the etching rate prediction sub-models of the 9 temperature control zones can also be obtained, so that when it is necessary to predict the etching rate distribution data at any target temperature of each temperature control zone, the etching rate distribution data at the predetermined target temperature of each temperature control zone can be obtained; when it is necessary to calculate the target temperature control value of each temperature control zone based on the target etching rate distribution data, the target temperature control value of each temperature control zone can be obtained to improve the uniformity of wafer etching or obtain the desired morphology.
- the deposition rate prediction model of the embodiment of the present application is associated with a deposition rate prediction sub-model for each temperature control zone.
- Each deposition rate prediction sub-model is used to represent the corresponding relationship between the deposition rate at each location on the wafer support surface and the associated location when the temperature control value of the corresponding temperature control zone changes. Further details can be found in the relevant description above and will not be repeated here.
- a wafer etching method which is applied to a process chamber having a wafer carrier, wherein the wafer carrier surface of the wafer carrier has multiple temperature control zones.
- the wafer carrier may be, for example, a multi-temperature zone electrostatic chuck or a heated pedestal.
- the method may be executed by a control device of semiconductor process equipment, such as a host computer or a slave computer of the semiconductor process equipment. The method may include the following steps:
- the etching rate prediction model is used to characterize that when the temperature control value of any temperature control zone changes, the etching rates of all positions on the wafer carrying surface are affected by the changed temperature control zone, and the corresponding relationship between the etching rate of each position after the change and the corresponding position.
- the etching rate prediction model used is used to characterize that when the temperature control value of any temperature control zone changes, the etching rate of all positions on the wafer carrier surface is affected by the changed temperature control zone, and the corresponding relationship between the etching rate of each position after the change and the corresponding position, that is, when the temperature control value of one or several temperature control zones in the etching rate prediction model of the embodiment of the present application changes, it will not only affect the etching rate value of the changed temperature control zone, but also affect the etching rate values of other temperature control zones.
- the etching rate prediction model associated only with temperature sensitivity in the related art only considers the influence of temperature. For the temperature control zone where the temperature does not change, since the temperature does not change, it is considered that its etching rate does not change.
- the etching rate prediction model adopted by the wafer etching method of the embodiment of the present application takes into account that when the temperature control value of one or several temperature control zones changes, it will also affect the etching rate values of various positions in other temperature control zones, and can compensate for the influence of the diffusion of etching by-products on the etching rate distribution. Therefore, it can more accurately predict the etching rate distribution data of various positions on the wafer at any target temperature in each temperature control zone, or can more accurately calculate the target temperature control value of each temperature control zone based on the target etching rate distribution data.
- the etching rate prediction model can be associated with each position on the two-dimensional plane of the wafer carrying surface, but such an etching rate prediction model is relatively complex, which is not conducive to quickly predicting the etching rate distribution data of each position on the wafer, or calculating the target temperature control value of each temperature control zone.
- the embodiment of the present application also provides a wafer etching method, which is applied to a process chamber with a wafer carrying device, as shown in Figures 3A and 3B, the wafer carrying surface of the wafer carrying device has a plurality of main temperature control zones 34 and a plurality of auxiliary temperature control zones 35, and the plurality of main temperature control zones 34 are arranged in sequence in the radial direction of the wafer carrying surface, and the main temperature control zone 34 located on the outside of the radial direction is arranged around the main temperature control zone 34 located on the inside of the radial direction, and the plurality of auxiliary temperature control zones 35 are arranged along the angular direction of the wafer carrying device, and the wafer carrying device can be, for example, a multi-temperature zone electrostatic chuck or a heating base.
- the method can be executed by a control device of a semiconductor process equipment, and the control device can be, for example, a host computer or a slave computer of a semiconductor process equipment
- the first basic etching rate distribution data includes multiple etching rate values associated with radial positions on the wafer support surface, and the temperature sensitivity value is used to characterize the rate of change of the etching rate with temperature.
- the temperature sensitivity value is used to characterize the rate of change of the etching rate with temperature.
- the first etch rate prediction model is associated with the radial diffusion of etching byproducts generated during the etching process.
- the first etch rate prediction model is used to characterize the correspondence between the etch rate of each radial position on the wafer support surface and the associated position.
- the first target etch rate distribution data includes multiple target etch rate values associated with radial positions on the wafer support surface. For further details, refer to the corresponding description of step S12.
- the first etching rate prediction model is only associated with each position in the radial direction on the wafer supporting surface.
- the model is relatively simple and can quickly predict the etching rate distribution data of each position in the radial direction of the wafer, or calculate the target temperature control value of each main temperature control zone to achieve etching uniformity in the radial direction of the wafer, or obtain the desired morphology in the radial direction.
- the second basic etching rate distribution data includes a plurality of etching rate values associated with positions in an angular direction on the wafer carrying surface.
- This step is used to adjust the etching uniformity in the angular direction of the wafer.
- the second etching rate prediction models corresponding to the 4 auxiliary temperature control zones in the inner area are used to adjust the angular etching uniformity of the inner area
- the second etching rate prediction models corresponding to the 8 auxiliary temperature control zones in the middle area are used to adjust the angular etching uniformity of the middle area
- the second etching rate prediction models corresponding to the 16 auxiliary temperature control zones in the outer area are used to adjust the angular etching uniformity of the outer area.
- the second etching rate prediction model is associated with the diffusion of etching by-products in the angular direction generated during the etching process.
- the second etching rate prediction model is used to characterize the correspondence between the etching rate of each position in the angular direction on the wafer carrier surface and the associated position.
- the second target etching rate distribution data includes multiple target etching product rate values associated with the positions in the angular direction on the wafer carrier surface.
- the second etching rate prediction model is only associated with each position in the angular direction of the wafer carrying surface.
- the model is relatively simple and can quickly predict the etching rate distribution data of each position in the angular direction of the wafer, or calculate the target temperature control value of each auxiliary temperature control zone to achieve etching uniformity in the angular direction of the wafer, or obtain the desired morphology in the angular direction.
- the target temperature control value of each main temperature control zone is obtained through the first stage, i.e., steps S31 and S32, so that the etching uniformity in the radial direction of the wafer can be adjusted or the desired morphology in the radial direction can be obtained.
- the target temperature control value of each auxiliary temperature control zone is obtained through the second stage, i.e., steps S33 and S34, so that the etching uniformity in the angular direction of the wafer can be adjusted or the desired morphology in the angular direction can be obtained.
- the above-mentioned wafer etching method achieves etching uniformity across the entire wafer plane or obtains the desired morphology across the entire wafer plane through these two stages.
- the first and second etching rate prediction models used in these two stages are only associated with each position in one direction on the wafer support surface. Compared with the etching rate prediction model associated with each position on the two-dimensional plane of the wafer support surface, the model used in this embodiment is simpler, thereby enabling rapid temperature control.
- Another embodiment of the present application also discloses a method for obtaining an etching rate prediction model.
- This method can be applied, for example, to a process chamber having a wafer carrier as shown in Figures 3A and 3B.
- the wafer carrier surface of the wafer carrier has multiple main temperature control zones 34 and multiple auxiliary temperature control zones 35.
- the multiple main temperature control zones 34 are arranged in sequence in the radial direction of the wafer carrier surface.
- the main temperature control zones 34 located on the outer side of the radial direction are arranged around the main temperature control zone 34 located on the inner side of the radial direction.
- the multiple auxiliary temperature control zones 35 are arranged along the angular direction of the wafer carrier.
- the method may include the following steps:
- the first basic etch rate distribution data includes a plurality of etch rate values associated with radial positions on the wafer support surface. For further details, refer to the corresponding description of step S21.
- step S42 Change the temperature control value of one of the main temperature control zones, and keep the other main temperature control zones at the basic temperature, and obtain the changed etching rate distribution data in the radial direction.
- step S22 Change the temperature control value of one of the main temperature control zones, and keep the other main temperature control zones at the basic temperature, and obtain the changed etching rate distribution data in the radial direction.
- step S43 Obtain a first etch rate prediction sub-model for the changed main temperature control zone.
- the first etch rate prediction sub-model is associated with the first basic etch rate distribution data, the changed etch rate distribution data, the basic temperature, the changed temperature control value of the main temperature control zone, and the temperature sensitivity value.
- step S23 Obtain a first etch rate prediction sub-model for the changed main temperature control zone.
- the first etch rate prediction sub-model is associated with the first basic etch rate distribution data, the changed etch rate distribution data, the basic temperature, the changed temperature control value of the main temperature control zone, and the temperature sensitivity value.
- the second etch rate prediction sub-models of the 28 auxiliary temperature control zones can, for example, obtain three second etch rate prediction models.
- the second etch rate prediction models corresponding to the four auxiliary temperature control zones in the inner region are used to adjust the angular etching uniformity of the inner region
- the second etch rate prediction models corresponding to the eight auxiliary temperature control zones in the middle region are used to adjust the angular etching uniformity of the middle region
- the second etch rate prediction models corresponding to the 16 auxiliary temperature control zones in the outer region are used to adjust the angular etching uniformity of the outer region.
- Another embodiment of the present application further provides a wafer etching or deposition method, which is applied to a process chamber having a wafer carrier, wherein the wafer carrier has a wafer carrier surface with multiple temperature control zones, and the wafer carrier may be, for example, a multi-temperature zone electrostatic chuck or a heating pedestal.
- the method may be executed by a control device of semiconductor process equipment, and the control device may be, for example, a host computer or a slave computer of the semiconductor process equipment.
- the method may include the following steps:
- the etching or deposition rate prediction model obtained by the method described in the above method embodiment for obtaining an etching or deposition rate prediction model, and obtain the target temperature control value of each temperature control zone according to the target etching or deposition rate distribution data, the basic etching or deposition rate distribution data, and the temperature sensitivity value; wherein the target etching or deposition rate distribution data includes a plurality of target etching rate values associated with positions on the wafer carrying surface.
- the semiconductor process equipment may include: a process chamber 41, a wafer carrier 42 and a control device 43.
- the wafer carrier 42 may be, for example, a multi-temperature zone electrostatic chuck or a heating base, which is arranged in the process chamber 41, and the wafer carrying surface of the wafer carrier 42 has multiple temperature control zones;
- the control device 43 includes at least one processor and at least one memory, and the memory stores a computer program, and when the computer program is executed by the processor, it implements the methods described in the various embodiments above.
- the memory stores the etching or deposition rate prediction model obtained in the embodiment of the method for obtaining the etching or deposition rate prediction model described above.
- control device 43 can be either a host computer or a slave computer. In addition to controlling the target control temperatures of each temperature control zone on the wafer support surface, the control device 43 can also control the opening of the valve of the semiconductor process equipment's inlet assembly to introduce the corresponding process gas into the process chamber 41. The control device 43 can also control the opening and closing of the valve of the inlet assembly to control the flow rate of the process gas. The control device 43 can also control the exhaust assembly to exhaust the interior of the process chamber, for example, by controlling the valve opening of the exhaust assembly or the speed of the exhaust pump, thereby controlling the pressure within the process chamber 41 and removing reaction byproducts.
- the semiconductor process equipment may also include a radio frequency coil.
- the control device 43 is further configured to control the radio frequency power supply to provide radio frequency power to the radio frequency coil to excite the process gas within the process chamber 41 to generate plasma.
- the control device 43 is also configured to control the radio frequency power supply to provide radio frequency power to the wafer support assembly 42 to provide an radio frequency bias voltage.
- the semiconductor process equipment can process wafers on the wafer support assembly 42.
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Abstract
本申请实施例公开了一种晶圆刻蚀或沉积及模型获取方法、半导体工艺设备,具体涉及用于多温区静电卡盘或加热基座的各个温度控制区的控温方法,该控温方法结合了温度敏感度和刻蚀副产物或沉积物随温度梯度的扩散分布对于刻蚀或沉积速率的影响,能够更加准确地预测在各个温度控制区的任意目标温度下,晶圆上的各个位置的刻蚀或沉积速率分布数据,或是根据目标刻蚀或沉积速率分布数据,通过调节各个温度控制区的目标温度控制值,以提升晶圆刻蚀或沉积的均一性,或是使晶圆表面得到期望的形貌。
Description
本申请属于半导体技术领域,具体属于多温区静电卡盘或加热基座的温度控制技术领域,更具体地涉及一种晶圆刻蚀或沉积方法、用于获取刻蚀或沉积速率预测模型的方法及半导体工艺设备。
集成电路先进工艺制程一般由上千道工艺程序组成,包括:刻蚀、沉积、清洗等环节。其中刻蚀作为关键环节,决定了半导体器件的关键尺寸,最终影响半导体器件性能。刻蚀速率和刻蚀均一性是半导体工艺的重点关注参数,当前通常通过调整晶圆承载装置的各个温度控制区的温度值来调节刻蚀速率,以保障晶圆的刻蚀均一性。
在相关技术中,当晶圆承载装置的某个温度控制区的温度值发生改变时,根据温度敏感度和改变前后的温度差值来预测改变后的刻蚀速率,然而该方法预测得到的刻蚀速率分布数据与实际测量的刻蚀速率分布数据存在较大偏差。
本申请实施例公开了一种晶圆刻蚀或沉积方法、用于获取刻蚀或沉积速率预测模型的方法及半导体工艺设备,以解决相关技术中刻蚀或沉积速率分布数据的预测值与实测值存在较大偏差的问题。
为了解决上述技术问题,根据第一方面,本申请实施例公开了一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个主温度控制区和多个辅温度控制区,多个所述主温度控制区在所述晶圆承载面的径向方向上依次设置,位于径向方向外侧的所述主温度控制区环绕位于径向方向内侧的所述主温度控制区设置,多个所述辅温度控制区沿所述晶圆承载装置的角向设置,所述方法包括:
获取待刻蚀或沉积晶圆在各个所述主温度控制区的基本温度下,沿径向方向的第一基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述第一基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;
利用预设的第一刻蚀或沉积速率预测模型,根据第一目标刻蚀或沉积速率分布数据、所述第一基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述主温度控制区的目标温度控制值;其中,所述第一刻蚀或沉积速率预测模型与刻蚀或沉积工艺过程中产生的径向方向的刻蚀副产物或沉积物扩散相关联,所述第一刻蚀或沉积速率预测模型用于表征所述晶圆承载面上径向方向的各个位置的刻蚀或沉积速率与相关联位置的对应关系,所述第一目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的目标刻蚀或沉积速率值。
根据第二方面,本申请实施例公开了一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,所述方法包括:
获取待刻蚀或沉积晶圆在各个所述温度控制区的基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;
利用预设的刻蚀或沉积速率预测模型,根据目标刻蚀或沉积速率分布数据、所述基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述温度控制区的目标温度控制值;其中,所述刻蚀或沉积速率预测模型与刻蚀或沉积工艺过程中产生的刻蚀副产物或沉积物扩散相关联,所述刻蚀或沉积速率预测模型用于表征所述晶圆承载面上的各个位置的刻蚀或沉积速率与相关联位置的对应关系,所述目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的目标刻蚀或沉积速率值。
根据第三方面,本申请实施例公开了一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,所述方法包括:
获取待刻蚀或沉积晶圆在各个所述温度控制区的基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;
利用预设的刻蚀或沉积速率预测模型,根据目标刻蚀或沉积速率分布数据、所述基本刻蚀或沉积速率分布数据以及所述温度敏感度分布数据,获取各个所述温度控制区的目标温度控制值;其中,所述刻蚀或沉积速率预测模型用于表征任意所述温度控制区的温度控制值发生改变时,所述晶圆承载面上的所有位置均受所改变的温度控制区的影响,各个位置改变后的刻蚀或沉积速率与相应位置的对应关系,所述目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的目标刻蚀或沉积速率值。
根据第四方面,本申请实施例公开了一种用于获取刻蚀或沉积速率预测模型的方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,所述方法包括:
获取待刻蚀或沉积晶圆在各个所述温度控制区均处于基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;
改变所述温度控制区中的一个温度控制区的温度控制值,并保持其余温度控制区仍为所述基本温度,获取改变后的刻蚀或沉积速率分布数据;
获取所改变的温度控制区的刻蚀或沉积速率预测子模型,所述刻蚀或沉积速率预测子模型与所述基本刻蚀或沉积速率分布数据、所述改变后的刻蚀或沉积速率分布数据、所述基本温度、所改变的温度控制区的温度控制值以及所述温度敏感度值相关;
重复改变所述温度控制区中的另一个温度控制区的温度控制值,并保持其余温度控制区仍为基本温度,获取改变后的刻蚀或沉积速率分布数据,并获取所改变的温度控制区的刻蚀或沉积速率预测子模型,直至获取全部所述温度控制区的刻蚀或沉积速率预测子模型;
根据各个所述温度控制区的刻蚀或沉积速率预测子模型得到所述刻蚀或沉积速率预测模型。
根据第五方面,本申请实施例公开了一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,所述方法包括:
获取待刻蚀或沉积晶圆在各个所述温度控制区的基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;
利用根据上述第四方面所述的方法得到的刻蚀或沉积速率预测模型,根据目标刻蚀或沉积速率分布数据、所述基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述温度控制区的目标温度控制值;其中,所述目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的目标刻蚀或沉积速率值。
根据第六方面,本申请实施例公开了一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个主温度控制区和多个辅温度控制区,多个所述主温度控制区在所述晶圆承载面的径向方向上依次设置,位于径向方向外侧的所述主温度控制区环绕位于径向方向内侧的所述主温度控制区设置,多个所述辅温度控制区沿所述晶圆承载装置的角向设置,所述方法包括:
获取待刻蚀或沉积晶圆在各个所述主温度控制区的基本温度下,沿径向方向的第一基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述第一基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;
利用根据上述第四方面所述的方法得到的第一刻蚀或沉积速率预测模型,根据第一目标刻蚀或沉积速率分布数据、所述第一基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述主温度控制区的目标温度控制值;其中,所述第一目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的目标刻蚀或沉积速率值。
根据第七方面,本申请实施例公开了一种半导体工艺设备,包括:
工艺腔室;
晶圆承载装置,设置在所述工艺腔室内,所述晶圆承载装置的晶圆承载面具有多个温度控制区;
控制装置,包括至少一个处理器和至少一个存储器,所述存储器中存储有计算机程序,所述计算机程序被所述处理器执行时实现上述第一至第六方面任一项所述的方法。
根据第八方面,本申请实施例公开了一种半导体工艺设备,包括:
工艺腔室;
晶圆承载装置,设置在所述工艺腔室内,所述晶圆承载装置的晶圆承载面具有多个温度控制区;
控制装置,包括至少一个处理器和至少一个存储器,所述存储器中存储有上述第四方面所述的方法得到的刻蚀或沉积速率预测模型。
在本申请实施例的晶圆刻蚀或沉积方法中,通过采用与刻蚀或沉积工艺过程中产生的刻蚀副产物或沉积物扩散相关联的刻蚀或沉积速率预测模型,与相关技术中仅与温度敏感度相关联的刻蚀速率预测模型相比,能够补偿刻蚀副产物或沉积物扩散对于刻蚀或沉积速率分布所造成的影响,因此能够更加精确地预测在各个温度控制区的任意目标温度下,晶圆上的各个位置的刻蚀或沉积速率分布数据,或者是能够根据目标刻蚀或沉积速率分布数据来更加精确地计算各个温度控制区的目标温度控制值。也即,采用本申请实施例的晶圆刻蚀或沉积方法对晶圆承载装置的各个温度控制区的温度进行控制,能够提升晶圆刻蚀或沉积的均一性,或是使晶圆表面得到期望的形貌。
图1和图2分别示出了本申请实施例的晶圆承载装置的俯视示意图;
图3A和图3B分别示出了本申请另一实施例的晶圆承载装置的截面和俯视示意图;
图4示出了通过相关技术预测得到的刻蚀速率分布数据与实际测量的刻蚀速率分布数据;
图5示出了本申请实施例的刻蚀副产物扩散机理示意图;
图6示出了本申请实施例的晶圆刻蚀方法的流程图;
图7示出了本申请实施例的用于获取刻蚀速率预测模型的方法的流程图;
图8示出了第一温度控制区的采用平滑曲线拟合的刻蚀速率预测子模型;
图9示出了通过本申请实施例的刻蚀速率预测模型预测得到的刻蚀速率分布数据与实际测量的刻蚀速率分布数据;
图10示出了本申请另一实施例的晶圆刻蚀方法的流程图;
图11示出了本申请另一实施例的用于获取刻蚀速率预测模型的方法的流程图;
图12示出了本申请实施例的半导体工艺设备的示意图。
为使本申请的目的、技术方案和优点更加清楚,下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。
本领域技术人员应当理解,本申请实施例仅是对可以以各种形式来实施本申请所请求保护的结构和方法的说明。此外,结合各种实施例给出的每个示例旨在是说明性的,而不是限制性的。此外,附图不一定按比例绘制,一些特征可能被夸大以显示特定组件的细节。因此,本申请实施例中的具体结构和功能细节不应被解释为限制性的,而仅仅是作为教导本领域技术人员以不同方式采用本申请实施例的方法和结构的代表性基础。还应注意,相同和对应的元素由相同的附图标记表示。
在下文的描述中,阐述了许多具体细节,例如特定结构、组件、材料、尺寸、处理步骤和技术,以便提供对本申请的各种实施例的理解。然而,本领域技术人员应当理解,可以在没有这些具体细节的情况下实践本申请的各种实施例。在其他情况下,未详细描述众所周知的结构或处理步骤,以避免混淆本申请。
出于下文描述的目的,术语“上”、“右”、“左”、“垂直”、“水平”、“顶部”、“底部”及其派生词应与说明书附图所公开的结构和方法中的定向有关。应当理解,当作为层、区域或衬底的元素被称为在另一元素上时,该元素可以直接在另一元素上,或者也可以存在中间元素。相反,当一个元素被称为直接在另一元素上时,两者之间不存在中间元素。还应当理解,当一个元素被称为在另一元素下时,该元素可以直接在另一元素下,或者可以存在中间元素。相反。当一个元素被称为直接在另一元素下时,两者之间不存在中间元素。
图1和图2分别示出了本申请实施例的晶圆承载装置的俯视示意图,该晶圆承载装置例如可以是多区静电卡盘或加热基座,其晶圆承载面可以具有多个温度控制区,在图1的示例中,该晶圆承载装置具有4个温度控制区,即径向方向上从内到外依次设置的第一温度控制区11、第二温度控制区12、第三温度控制区13和第四温度控制区14,第一温度控制区11为位于晶圆承载面中心的圆形区域,第二温度控制区12、第三温度控制区13和第四温度控制区14为由内至外顺次环绕第一温度控制区11设置的环形区域,即第二温度控制区12环绕第一温度控制区11设置,第三温度控制区13环绕第二温度控制区12设置,第四温度控制区14环绕第三温度控制区13设置。在图2的示例中,该晶圆承载装置具有9个温度控制区,即位于晶圆承载面中心的第一温度控制区21,环绕第一温度控制区21分布的第二温度控制区22、第三温度控制区23、第四温度控制区24和第五温度控制区25,以及环绕第二至第四温度控制区分布的第六温度控制区26、第七温度控制区27、第八温度控制区28和第九温度控制区29。
图3A和图3B示出了本申请另一实施例的晶圆承载装置的示意图,该晶圆承载装置例如可以包括基座31、加热层32和静电卡盘33。其中,加热层32包括多个主温度控制区34对应的主加热器和多个辅温度控制区35对应的辅加热器,多个主温度控制区34在径向方向上依次设置,位于径向方向外侧的主温度控制区34环绕位于径向方向内侧的主温度控制区34设置,多个辅温度控制区35沿晶圆承载装置的角向设置,以对晶圆承载面上的温度进行局部调整,例如用于调节晶圆承载面角向上的均一性。在图3A和图3B的示例中,主温度控制区34所对应的主加热器位于辅温度控制区35所对应的辅加热器上方,然而本申请并不限于此,主温度控制区34所对应的主加热器也可以位于辅温度控制区35所对应的辅加热器下方。静电卡盘33包括吸附电极36,以对晶圆承载面上的晶圆提供静电吸附力,吸附电极36可以设置为单极性或双极性电极,或者其他合适的设置,本申请对此不做任何限定。
本领域技术人员应当理解,图1、图2、图3A和图3B仅仅只是作为示例,更多或更少的温度控制区都是可行的,温度控制区可以规则地布设在晶圆承载面上,也可以不规则地布设在晶圆承载面上,本申请对此不做任何限定。对于温度敏感的刻蚀工艺,由于种种原因可能导致射频源激发产生的等离子体分布不均匀,需要调节晶圆承载装置的各个温度控制区的温度,以补偿由于等离子体分布的不均匀所带来的刻蚀速率差异,从而保障晶圆刻蚀的均一性。
在相关技术中,首先分别获取晶圆承载装置的各个温度控制区的温度处于高温TH和低温TL下,所刻蚀的晶圆的各个位置的刻蚀速率分布数据[ER]H和[ER]L,需要说明的是,本文中采用[ER]H和[ER]L来表征刻蚀速率分布数据,其中的括号[]仅意在表明包括多个与位置相关联的刻蚀速率值,例如对于半径为150mm的晶圆,如果在径向方向上每间隔10mm采集一个点,则可以得到16个与径向位置相对应的刻蚀速率值,例如[ER]H=[ER0,ER1,…,ER15],其中ER0表示自圆心为原点的位置0mm处的刻蚀速率值,ER1表示自圆心为原点的位置10mm处的刻蚀速率值,以此类推,在下文中将会沿用这种表述方式。本领域技术人员应当理解,所采集的点并不限于径向方向,而可以是晶圆上的任意点。
然后,获取温度敏感度值[Sen]=([ER]H-[ER]L)/(TH-TL),也即计算多个与位置相关联的刻蚀速率随温度的变化率。最后,可以根据该温度敏感度值预测任意目标温度[T]target下的刻蚀速率分布数据[ER]target,或者是根据该公式,根据目标刻蚀速率分布数据来计算各个温度控制区的目标温度控制值。其中,[ER]target=[ER]base+([T]target-[T]base)·[Sen],[ER]base为在晶圆承载装置的各个温度控制区的温度均处于基本温度Tbase下各个位置的刻蚀速率分布数据,[T]target-[T]base表示对应的温度控制区的目标温度与基本温度相减,例如图1或图2或图3A和图3B中所示的各个温度控制区的目标温度与基本温度相减,在下文中将会沿用这种表述方式。
本申请的发明人在实施上述相关技术的过程中发现,通过上述相关技术预测得到的刻蚀速率分布数据与实际测量的刻蚀速率分布数据存在较大偏差,如图4所示,为简化起见,以晶圆径向方向上的分布数据为例,收取工艺在基本温度[T]base=[60,60,60,60]下径向方向上的基本刻蚀速率分布数据[ER]base,同时收取工艺的温度敏感度值,采用相关技术的刻蚀速率预测模型预测[T]target=[60,63,65,58]下径向方向上的刻蚀速率分布数据与实测的刻蚀速率分布数据相对比,图4中的空心圆点表示预测值,实心圆点表示实测值,两者之间存在较大偏差。因此,采用上述相关技术不能准确预测刻蚀速率分布数据,相应地,也不能根据目标刻蚀速率分布数据来准确得到各个温度控制区的目标温度控制值。
为解决上述技术问题,本申请的发明人对于等离子体刻蚀机理进行了深入研究,在等离子体刻蚀过程中,会不断产生各种刻蚀副产物,当刻蚀副产物堆积较多时,会加重沉积效果,使得刻蚀速率降低;当刻蚀副产物堆积较少时,沉积效果减弱,更容易产生刻蚀,增加刻蚀速率。本申请的发明人发现,当晶圆承载装置表面温度不同时,刻蚀副产物会随着温度梯度由高温区向低温区扩散,如图5所示,即高温区堆积的刻蚀副产物会少于低温区堆积的刻蚀副产物,这样会使得整体的刻蚀速率发生变化。上述相关技术并未考虑到刻蚀副产物扩散的影响,因此预测得到的刻蚀速率分布数据会与实际测量的刻蚀速率分布数据存在偏差。
基于本申请的发明人的上述研究工作,本申请实施例提供了一种晶圆刻蚀方法,该方法应用于具有晶圆承载装置的工艺腔室,该晶圆承载装置的晶圆承载面具有多个温度控制区,该晶圆承载装置例如可以是多温区静电卡盘或加热基座,该方法可以由半导体工艺设备的控制装置来执行,该控制装置例如可以是半导体工艺设备的上位机或下位机。如图6所示,该方法可以包括如下步骤:
S11.获取待刻蚀晶圆在各个温度控制区的基本温度下的基本刻蚀速率分布数据以及温度敏感度值。
在本实施例中,该基本刻蚀速率分布数据包括多个与晶圆承载面上的位置相关联的刻蚀速率值,该温度敏感度值用于表征刻蚀速率随温度的变化率。在本实施例中,基本刻蚀速率分布数据以及温度敏感度值可以预先保存在半导体工艺设备的控制装置的存储器内,基本刻蚀速率分布数据与晶圆承载面的二维平面上的各个位置相关联,当各个温度控制区的基本温度为Tbase时,可以收取到多个与晶圆承载面上的位置相关联的基本刻蚀速率[ER]base;温度敏感度值可以是单个数值,也可以是多个与晶圆承载面上的位置相关联的值,下文中还将对此进行详细说明。
S12.利用预设的刻蚀速率预测模型,根据目标刻蚀速率分布数据、基本刻蚀速率分布数据以及温度敏感度值,获取各个温度控制区的目标温度控制值。
可以采用如下函数来表征上述关系:
[ER]tar get=f([M],[ER]base,[Sen],[T]tar get,Tbase)
其中,[ER]target表示目标刻蚀速率分布数据,[M]表示刻蚀速率预测模型,[ER]base表示基本刻蚀速率分布数据,[Sen]表示温度敏感度值,[T]target表示各个温度控制区的目标温度控制值,Tbase表示基本温度。在上述函数关系中,[M]、[ER]base、[Sen]、Tbase均为已知值,当需要预测在各个温度控制区的任意目标温度下,晶圆上的各个位置的刻蚀速率分布数据时,[T]target为已知值,根据上述函数关系可以得到[ER]target;当需要根据目标刻蚀速率分布数据计算各个温度控制区的目标温度控制值,以实现刻蚀均一性或者使晶圆表面得到期望的形貌时,[ER]target为已知值,根据上述函数关系可以得到[T]target。
在本实施例中,刻蚀速率预测模型[M]与刻蚀工艺过程中产生的刻蚀副产物扩散相关联,刻蚀速率预测模型[M]用于表征晶圆承载面上的各个位置的刻蚀速率与相关联位置的对应关系,目标刻蚀速率分布数据[ER]target包括多个与晶圆承载面上的位置相关联的目标刻蚀速率值。
同样地,刻蚀速率预测模型[M]可以预先保存在半导体工艺设备的控制装置的存储器内。在一些实施例中,刻蚀速率预测模型[M]相对于温度敏感度值进行归一化处理,从而可以对各种待刻蚀晶圆具有通用性,也就是说,本申请实施例的刻蚀速率预测模型可以适用于单晶硅、多晶硅、氧化硅等各种材料的刻蚀,对于不同的刻蚀工艺,无需更换模型。下文中还将对刻蚀速率预测模型进行详细说明。
如上文所述,相关技术中的晶圆承载装置的温度控制方法中,当某一个温度控制区的温度发生变化时,仅考虑到该温度控制区的刻蚀速率变化,而并未意识到该温度控制区的温度发生变化时,刻蚀过程中产生的刻蚀副产物会随温度梯度由高温区向低温区扩散,从而会影响晶圆承载面上的所有位置的刻蚀速率。在本申请实施例的晶圆刻蚀方法中,通过采用与刻蚀工艺过程中产生的刻蚀副产物扩散相关联的刻蚀速率预测模型,与相关技术中仅与温度敏感度相关联的刻蚀速率预测模型相比,能够补偿刻蚀副产物扩散对于刻蚀速率分布所造成的影响,因此能够更加精确地预测在各个温度控制区的任意目标温度下,晶圆上的各个位置的刻蚀速率分布数据,或者是能够根据目标刻蚀速率分布数据更加精确地计算各个温度控制区的目标温度控制值。也即,采用本申请实施例的晶圆刻蚀方法对晶圆承载装置的各个温度控制区的温度进行控制,能够提升晶圆刻蚀的均一性,或是使晶圆表面得到期望的形貌。
本申请的发明人进一步发现,本申请实施例的多个温度控制区的温度控制方法不仅可以适用于刻蚀工艺,还可以适用于沉积工艺。对于温度敏感的沉积工艺而言,当晶圆承载装置表面温度不同时,沉积物会随着温度梯度由高温区向低温区扩散,即高温区堆积的沉积物会少于低温区堆积的沉积物,因而当某一个温度控制区的温度发生变化时,不仅会影响到温度改变的温度控制区的沉积速率,还会影响晶圆承载面上的所有位置的沉积速率。与上文所述的晶圆刻蚀方法相对应,本申请实施例还提供了一种晶圆沉积方法,可以包括如下步骤:
S11’.获取待沉积晶圆在各个温度控制区的基本温度下的基本沉积速率分布数据以及温度敏感度值,该基本沉积速率分布数据包括多个与晶圆承载面上的位置相关联的沉积速率值,该温度敏感度值用于表征沉积速率随温度的变化率。
S12’.利用预设的沉积速率预测模型,根据目标沉积速率分布数据、基本沉积速率分布数据以及温度敏感度值,获取各个温度控制区的目标温度控制值;其中,该沉积速率预测模型与沉积工艺过程中产生的沉积物扩散相关联,该沉积速率预测模型用于表征晶圆承载面上的各个位置的沉积速率与相关联位置的对应关系,该目标沉积速率分布数据包括多个与晶圆承载面上的位置相关联的目标沉积速率值。
在本申请实施例的晶圆沉积方法中,通过采用与沉积工艺过程中沉积物扩散相关联的沉积速率预测模型,与相关技术中仅与温度敏感度相关联的沉积速率预测模型相比,能够补偿沉积物扩散对于沉积速率分布所造成的影响,因此能够更加精确地预测在各个温度控制区的任意目标温度下,晶圆上的各个位置的沉积速率分布数据,或者是能够根据目标沉积速率分布数据更加精确地计算各个温度控制区的目标温度控制值。
在下文中,将详细描述本申请实施例的刻蚀速率预测模型。该刻蚀速率预测模型与各个温度控制区的刻蚀速率预测子模型相关联,各个刻蚀速率预测子模型分别用于表征对应的各个温度控制区的温度控制值发生改变时,晶圆承载面上的各个位置的刻蚀速率与相关联位置的对应关系。
如图7所示,本申请实施例提供的一种用于获取该刻蚀速率预测模型的方法可以包括如下步骤:
S21.获取待刻蚀晶圆在各个温度控制区均处于基本温度Tbase下的基本刻蚀速率分布数据[ER]base以及温度敏感度值。
本领域技术人员应当理解,为了得到更为全面的刻蚀速率预测模型,以便能够提升整个晶圆平面上的刻蚀均一性,需要收取整个晶圆平面上的各个位置的分布数据,所获取的分布数据可以与二维平面上的各个位置相关联。
在晶圆承载装置具有如图1所示的4个温度控制区的情况下,当基本温度Tbase为60℃时,晶圆承载装置的各个温度控制区的温度从内至外顺序可以采用[T]base=[60,60,60,60]来表征,当然,在晶圆承载装置具有如图2所示的9个温度控制区的情况下,各个温度控制区的温度依序可以采用[T]base=[T1,T2,T3,T4,T5,T6,T7,T8,T9]来表征,在下文中将会沿用这种表述方式。
S22.改变温度控制区中的一个温度控制区的温度控制值为T1,并保持其余温度控制区仍为基本温度Tbase,获取改变后的刻蚀速率分布数据[ER]1。
例如,将最内侧的第一温度控制区11的温度控制值改变为65℃,其余温度控制区仍为60℃,此时的晶圆承载装置的温度为[65,60,60,60],在此情况下检测得到晶圆承载面上的各个位置改变后的刻蚀速率分布数据。
S23.获取所改变的温度控制区的刻蚀速率预测子模型[M]1,该刻蚀速率预测子模型[M]1与基本刻蚀速率分布数据[ER]base、改变后的刻蚀速率分布数据[ER]1、基本温度Tbase、所改变的温度控制区的温度控制值T1以及温度敏感度值[Sen]相关。
更具体地,刻蚀速率预测子模型[M]sub可以由下式表示:
温度敏感度值[Sen]可以由下式表示:
其中,[ER]2表示晶圆承载装置的全部温度控制区的温度控制值均为T2时的刻蚀速率分布数据。
例如,可以将最内侧的第一温度控制区11的温度控制值改变为大于基本温度的65℃,在其他示例中,也可以将温度值改变为小于基本温度的温度控制值,例如为55℃。
为了得到温度敏感度值,例如可以将晶圆承载装置的温度控制区的温度控制值全部设置为T2=65℃,在此状态下检测出刻蚀速率分布数据[ER]2,同样也将刻蚀速率分布数据[ER]2进行归一化处理,以得到[Sen]。同样地,在其他示例中,可以将晶圆承载装置的温度控制区的温度控制值全部设置为低于60℃的温度控制值,例如为55℃,同样也可以依据上式(2)得到温度敏感度值。
为了简化起见,仅以晶圆径向方向上的分布数据为例,实际上,所获取的分布数据应与二维平面上的各个位置相关联,而并非仅与径向位置相关联。根据上述公式(1)计算得到的径向方向的数据如图8中的圆点所示,从而得到了最内侧的第一温度控制区11的刻蚀速率预测子模型[M]1,该刻蚀速率预测子模型用于表征对应的第一温度控制区11的温度控制值发生改变时,晶圆承载面上的各个位置的刻蚀速率与相关联位置的对应关系。为了得到任意位置对应的刻蚀速率,可以如图8所示采用平滑曲线来拟合上述公式(1)计算得到的数据,从而可以根据该平滑曲线得到任意位置对应的刻蚀速率。如图8所示,当最内侧的第一温度控制区11的温度值发生改变时,由于刻蚀副产物扩散的影响,径向方向上的各个位置的刻蚀速率都会发生改变。
需要说明的是,若将最内侧的第一温度控制区11的温度控制值改变为低于基本温度的温度值,则所得到的曲线会是相对于横轴对称的曲线。为了便于计算机处理,进一步地可以采用分段函数来表征上述平滑曲线,从而半导体设备的控制装置可以根据该分段函数便利地得到任意位置对应的刻蚀速率。在其他的一些实施方式中,还可以通过上述公式(1)计算得到的数据来训练得到神经网络模型,从而半导体设备的控制装置可以根据该神经网络模型便利地得到任意位置对应的刻蚀速率。
S24.判断是否已经获取全部温度控制区的刻蚀速率预测子模型,当未获取全部温度控制区的刻蚀速率预测子模型时,返回至步骤S22,以获取下一温度控制区的刻蚀速率预测子模型;当已获取全部温度控制区的刻蚀速率预测子模型时,执行步骤S25。
按照同样的方法,可以得到全部温度控制区的刻蚀速率预测子模型。
S25.根据各个温度控制区的刻蚀速率预测子模型得到刻蚀速率预测模型。
具体而言,当晶圆承载装置包括n个温度控制区,n为大于或等于2的整数,该刻蚀速率预测模型可以由下式表示:
其中,[ER]target表示晶圆承载装置的各个温度控制区处于相应的目标温度控制值时的目标刻蚀速率分布数据,[ER]base表示晶圆承载装置的全部温度控制区的温度控制值均为Tbase时的基本刻蚀速率分布数据,[Sen]表示温度敏感度值;
Ttarget1表示第一温度控制区的目标温度控制值,Ttarget2表示第二温度控制区的目标温度控制值,直至Ttargetn表示第n温度控制区的目标温度控制值,[M]1表示第一温度控制区的刻蚀速率预测子模型,[M]2表示第二温度控制区的刻蚀速率预测子模型,直至[M]n表示第n温度控制区的刻蚀速率预测子模型。
更具体地,对于图1所示的晶圆承载装置包括4个温度控制区的示例来说,上述公式(3)可以表示为:
在上述公式(4)中,[Sen]、[M]1、[M]2、[M]3、[M]4、Tbase均为已知数据,可以预先存储在半导体工艺设备的控制装置中的存储器内。当需要预测在各个温度控制区的任意目标温度下的刻蚀速率分布数据时,Ttarget1、Ttarget2、Ttarget3、Ttarget4均为已知值,将这些已知值代入到公式(4)中就可以得到[ER]target的值,也即得到各个温度控制区处于目标温度控制值下的目标刻蚀速率分布数据。当需要根据目标刻蚀速率分布数据来计算各个温度控制区的目标温度控制值时,[ER]target为已知数据,将[ER]target代入到公式(4)中就可以计算得到Ttarget1、Ttarget2、Ttarget3、Ttarget4的值,也即得到各个温度控制区的目标温度控制值。
以图1所示的晶圆承载装置包括4个温度控制区的情况为例,收取工艺在基本温度[T]base=[60,60,60,60]下径向方向上的基本刻蚀速率分布数据[ER]base,同时收取温度敏感度值[Sen],采用本申请实施例的刻蚀速率预测模型预测[T]target=[60,63,65,58]下径向方向上的刻蚀速率分布数据与实测的刻蚀速率分布数据相对比,如图9所示,图中的空心圆点表示预测值,实心圆点表示实测值,可见两者基本重合,预测的偏差度在2%以内,远优于图4所示的相关技术。
相应地,对于图2所示的包括9个温度控制区的晶圆承载装置而言,同样可以得到9个温度控制区的刻蚀速率预测子模型,从而当需要预测在各个温度控制区的任意目标温度下的刻蚀速率分布数据时,可以得到各个温度控制区的预定目标温度下的刻蚀速率分布数据;当需要根据目标刻蚀速率分布数据来计算各个温度控制区的目标温度控制值时,可以得到各个温度控制区的目标温度控制值,以提高晶圆刻蚀的均一性或是得到期望的形貌。
对应地,本申请实施例的沉积速率预测模型与各个温度控制区的沉积速率预测子模型相关联,各个沉积速率预测子模型分别用于表征对应的温度控制区的温度控制值发生改变时,晶圆承载面上的各个位置的沉积速率与相关联位置的对应关系。进一步的细节可以对应参阅上文中的相关描述,此处不再赘述。
本申请另一实施例公开了一种晶圆刻蚀方法,该方法应用于具有晶圆承载装置的工艺腔室,该晶圆承载装置的晶圆承载面具有多个温度控制区,该晶圆承载装置例如可以是多温区静电卡盘或加热基座,该方法可以由半导体工艺设备的控制装置来执行,该控制装置例如可以是半导体工艺设备的上位机或下位机。该方法可以包括如下步骤:
S31.获取待刻蚀晶圆在各个温度控制区的基本温度下的基本刻蚀速率分布数据以及温度敏感度值。
S32.利用预设的刻蚀速率预测模型,根据目标刻蚀速率分布数据、基本刻蚀速率分布数据以及温度敏感度值,获取各个温度控制区的目标温度控制值。
在本实施例中,刻蚀速率预测模型用于表征任意温度控制区的温度控制值发生改变时,晶圆承载面上的所有位置的刻蚀速率均受所改变的温度控制区的影响,各个位置改变后的刻蚀速率与相应位置的对应关系。
在本申请实施例的晶圆刻蚀方法中,所采用的刻蚀速率预测模型用于表征任意温度控制区的温度控制值发生改变时,晶圆承载面上的所有位置的刻蚀速率均受所改变的温度控制区的影响,各个位置改变后的刻蚀速率与相应位置的对应关系,也就是说,本申请实施例的刻蚀速率预测模型中的某一个或者某几个温度控制区的温度控制值发生改变时,不仅会影响到所改变的温度控制区的刻蚀速率值,还会影响到其他温度控制区的刻蚀速率值。这正是基于本申请的发明人发现当晶圆承载装置表面温度不同时,刻蚀副产物会随着温度梯度由高温区向低温区扩散,高温区堆积的刻蚀副产物会少于低温区堆积的刻蚀副产物,使得整个晶圆的刻蚀速率发生变化。而相关技术中仅与温度敏感度相关联的刻蚀速率预测模型则只考虑到温度的影响,对于温度未发生改变的温度控制区,由于温度未变,会认为其刻蚀速率也不变。由于相关技术中的刻蚀速率预测模型未考虑到刻蚀副产物扩散的影响,因此预测得到的刻蚀速率分布数据会与实际测量的刻蚀速率分布数据存在偏差。本申请实施例的晶圆刻蚀方法所采用的刻蚀速率预测模型考虑到某一个或者某几个温度控制区的温度控制值发生改变时还会影响到其他温度控制区的各个位置的刻蚀速率值,能够补偿刻蚀副产物扩散对于刻蚀速率分布所造成的影响,因此能够更加精确地预测在各个温度控制区的任意目标温度下,晶圆上的各个位置的刻蚀速率分布数据,或者是能够根据目标刻蚀速率分布数据来更加精确地计算各个温度控制区的目标温度控制值。
有关本实施例的进一步的详细内容,可以对应参考上一实施例中的相应描述,在此不再赘述。对应地,本实施例中的温度控制方法也可以适用于沉积工艺,具体细节可以对应参考上文中的相应描述,此处亦不再赘述。
在上文的实施例中,刻蚀速率预测模型可以与晶圆承载面的二维平面上的各个位置相关联,然而这样的刻蚀速率预测模型较为复杂,不利于快速预测晶圆上的各个位置的刻蚀速率分布数据,或是计算各个温度控制区的目标温度控制值。为了简化刻蚀速率预测模型,本申请实施例还提供了一种晶圆刻蚀方法,该方法应用于具有晶圆承载装置的工艺腔室,如图3A和图3B所示,该晶圆承载装置的晶圆承载面具有多个主温度控制区34和多个辅温度控制区35,多个主温度控制区34在晶圆承载面的径向方向上依次设置,位于径向方向外侧的主温度控制区34环绕位于径向方向内侧的主温度控制区34设置,多个辅温度控制区35沿晶圆承载装置的角向设置,该晶圆承载装置例如可以是多温区静电卡盘或加热基座,该方法可以由半导体工艺设备的控制装置来执行,该控制装置例如可以是半导体工艺设备的上位机或下位机。如图10所示,该方法可以包括如下步骤:
S31.获取待刻蚀晶圆在各个主温度控制区的基本温度下,沿径向方向的第一基本刻蚀速率分布数据以及温度敏感度值。
在本实施例中,第一基本刻蚀速率分布数据包括多个与晶圆承载面上径向方向的位置相关联的刻蚀速率值,温度敏感度值用于表征刻蚀速率随温度的变化率。进一步细节可以参考步骤S11中的相应描述。
S32.利用预设的第一刻蚀速率预测模型,根据第一目标刻蚀速率分布数据、第一基本刻蚀速率分布数据以及温度敏感度值,获取各个主温度控制区的目标温度控制值。
在本实施例中,第一刻蚀速率预测模型与刻蚀工艺过程中产生的径向方向的刻蚀副产物扩散相关联,第一刻蚀速率预测模型用于表征晶圆承载面上径向方向的各个位置的刻蚀速率与相关联位置的对应关系,第一目标刻蚀速率分布数据包括多个与晶圆承载面上径向方向的位置相关联的目标刻蚀速率值。进一步细节可以参考步骤S12中的相应描述。
在本实施例中,第一刻蚀速率预测模型仅与晶圆承载面上径向方向的各个位置相关联,模型较为简单,能够快速预测晶圆径向方向上的各个位置的刻蚀速率分布数据,或是计算各个主温度控制区的目标温度控制值,以实现晶圆径向方向上的刻蚀均一性,或是得到径向方向上的期望形貌。
S33.获取待刻蚀晶圆在各个辅温度控制区的基本温度下,沿角向方向的第二基本刻蚀速率分布数据以及温度敏感度值。
在本实施例中,第二基本刻蚀速率分布数据包括多个与晶圆承载面上角向方向的位置相关联的刻蚀速率值。
S34.利用预设的第二刻蚀速率预测模型,根据第二目标刻蚀速率分布数据、第二基本刻蚀速率分布数据以及温度敏感度值,获取各个辅温度控制区的目标温度控制值。
在本步骤中用于调整晶圆角向方向上的刻蚀均一性,在图3B的示例中有3个主温度控制区,每个主温度控制区均有多个辅温度控制区,因此需要3个第二刻蚀速率预测模型,对应于内侧区域中的4个辅温度控制区的第二刻蚀速率预测模型用于调节内侧区域的角向刻蚀均一性,对应于中间区域中的8个辅温度控制区的第二刻蚀速率预测模型用于调节中间区域的角向刻蚀均一性,对应于外侧区域中的16个辅温度控制区的第二刻蚀速率预测模型用于调节外侧区域的角向刻蚀均一性。
在本实施例中,第二刻蚀速率预测模型与刻蚀工艺过程中产生的角向方向的刻蚀副产物扩散相关联,第二刻蚀速率预测模型用于表征晶圆承载面上角向方向的各个位置的刻蚀速率与相关联位置的对应关系,第二目标刻蚀速率分布数据包括多个与晶圆承载面上角向方向的位置相关联的目标刻蚀积速率值。
在本实施例中,第二刻蚀速率预测模型仅与晶圆承载面上角向方向的各个位置相关联,模型较为简单,能够快速预测晶圆角向方向上的各个位置的刻蚀速率分布数据,或是计算各个辅温度控制区的目标温度控制值,以实现晶圆角向方向上的刻蚀均一性,或是得到角向方向上的期望形貌。
在图10所示的实施例的晶圆刻蚀方法中,通过第一阶段,即步骤S31和S32,获取各个主温度控制区的目标温度控制值,从而能够调节晶圆径向方向上的刻蚀均一性,或是得到径向方向上的期望形貌;然后通过第二阶段,即步骤S33和S34,获取各个辅温度控制区的目标温度控制值,从而能够调节晶圆角向方向上的刻蚀均一性,或是得到角向方向上的期望形貌。上述晶圆刻蚀方法通过这两个阶段实现了整个晶圆平面上的刻蚀均一性,或是得到整个晶圆平面上的期望形貌,这两个阶段所采用的第一和第二刻蚀速率预测模型仅与晶圆承载面上一个方向的各个位置相关联,相较于与晶圆承载面的二维平面上的各个位置相关联刻蚀速率预测模型,本实施例所采用的模型较为简单,从而能够实现快速温度控制。
本申请实施例的进一步细节可以对应参阅上文中的相关描述,此处不再赘述。本领域技术人员应当理解,本实施例中的温度控制方法也可以适用于沉积工艺,具体细节可以对应参考上文中的相应描述,此处亦不再赘述。
本申请另一实施例还公开了一种用于获取刻蚀速率预测模型的方法,该方法例如可以应用于具有如图3A和图3B所示的晶圆承载装置的工艺腔室,该晶圆承载装置的晶圆承载面具有多个主温度控制区34和多个辅温度控制区35,多个主温度控制区34在晶圆承载面的径向方向上依次设置,位于径向方向外侧的主温度控制区34环绕位于径向方向内侧的主温度控制区34设置,多个辅温度控制区35沿晶圆承载装置的角向设置。如图11所示,该方法可以包括如下步骤:
S41.获取待刻蚀晶圆在各个主温度控制区均处于基本温度下,沿径向方向的第一基本刻蚀速率分布数据,其中,第一基本刻蚀速率分布数据包括多个与晶圆承载面上径向方向的位置相关联的刻蚀速率值。进一步细节可以参考步骤S21中的相应描述。
S42.改变主温度控制区中的一个主温度控制区的温度控制值,并保持其余主温度控制区仍为基本温度,获取径向方向的改变后的刻蚀速率分布数据。进一步细节可以参考步骤S22中的相应描述。
S43.获取所改变的主温度控制区的第一刻蚀速率预测子模型,第一刻蚀速率预测子模型与第一基本刻蚀速率分布数据、改变后的刻蚀速率分布数据、基本温度、所改变的主温度控制区的温度控制值以及温度敏感度值相关。进一步细节可以参考步骤S23中的相应描述。
S44.重复改变主温度控制区中的另一个主温度控制区的温度控制值,并保持其余主温度控制区仍为基本温度,获取径向方向的改变后的刻蚀速率分布数据,并获取所改变的主温度控制区的刻蚀速率预测子模型,直至获取全部主温度控制区的刻蚀速率预测子模型。
S45.获取待刻蚀晶圆在各个辅温度控制区均处于基本温度下,沿角向方向的第二基本刻蚀速率分布数据,其中,第二基本刻蚀速率分布数据包括多个与晶圆承载面上角向方向的位置相关联的刻蚀速率值。
S46.改变辅温度控制区中的一个辅温度控制区的温度控制值,并保持其余辅温度控制区仍为基本温度,获取角向方向的改变后的刻蚀速率分布数据。
S47.获取所改变的辅温度控制区的第二刻蚀速率预测子模型,第二刻蚀速率预测子模型与第二基本刻蚀速率分布数据、改变后的刻蚀速率分布数据、基本温度、所改变的辅温度控制区的温度控制值以及温度敏感度值相关。
S48.重复改变辅温度控制区中的另一个辅温度控制区的温度控制值,并保持其余主温度控制区仍为基本温度,获取径向方向的改变后的刻蚀速率分布数据,并获取所改变的主温度控制区的刻蚀速率预测子模型,直至获取全部主温度控制区的刻蚀速率预测子模型。
S49.根据各个主温度控制区的第一刻蚀速率预测子模型得到第一刻蚀速率预测模型,根据各个辅温度控制区的第二刻蚀速率预测子模型得到第二刻蚀速率预测模型。
在图3B的示例中,有3个主温度控制区和28个辅温度控制区,每个主温度控制区均有多个辅温度控制区,这28个辅温度控制区的第二刻蚀速率预测子模型例如可以得到3个第二刻蚀速率预测模型,对应于内侧区域中的4个辅温度控制区的第二刻蚀速率预测模型用于调节内侧区域的角向刻蚀均一性,对应于中间区域中的8个辅温度控制区的第二刻蚀速率预测模型用于调节中间区域的角向刻蚀均一性,对应于外侧区域中的16个辅温度控制区的第二刻蚀速率预测模型用于调节外侧区域的角向刻蚀均一性。进一步细节可以参考步骤S25中的相应描述。
本实施例的进一步细节可以对应参阅上文中的相关描述,此处不再赘述。本领域技术人员应当理解,本实施例中的用于获取刻蚀速率预测模型的方法也可以适用于沉积工艺,具体细节可以对应参考上文中的相应描述,此处亦不再赘述。
本申请另一实施例还提供了一种晶圆刻蚀或沉积方法,该方法应用于具有晶圆承载装置的工艺腔室,该晶圆承载装置具有的晶圆承载面具有多个温度控制区,该晶圆承载装置例如可以是多温区静电卡盘或加热基座,该方法可以由半导体工艺设备的控制装置来执行,该控制装置例如可以是半导体工艺设备的上位机或下位机,该方法可以包括如下步骤:
S51.获取待刻蚀或沉积晶圆在各个温度控制区的基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,基本刻蚀或沉积速率分布数据包括多个与晶圆承载面上的位置相关联的刻蚀或沉积速率值,温度敏感度值包括多个与晶圆承载面上的位置相关联的温度敏感度值;
S52.利用上文用于获取刻蚀或沉积速率预测模型的方法实施例所述的方法得到的刻蚀或沉积速率预测模型,根据目标刻蚀或沉积速率分布数据、基本刻蚀或沉积速率分布数据以及温度敏感度值,获取各个温度控制区的目标温度控制值;其中,目标刻蚀或沉积速率分布数据包括多个与晶圆承载面上的位置相关联的目标刻蚀速率值。
有关本实施例的进一步的具体描述可以对应参考上文中的相关内容,在此不再赘述。
本申请另一实施例还公开了一种半导体工艺设备,如图12所示,该半导体工艺设备可以包括:工艺腔室41、晶圆承载装置42和控制装置43。晶圆承载装置42例如可以是多温区静电卡盘或加热基座,设置在工艺腔室41内,晶圆承载装置42的晶圆承载面具有多个温度控制区;控制装置43包括至少一个处理器和至少一个存储器,存储器中存储有计算机程序,计算机程序被处理器执行时实现如上文各个实施例所述的方法。在其他实施例中,存储器中存储有上文中用于获取刻蚀或沉积速率预测模型的方法的实施例所得到的刻蚀或沉积速率预测模型。
示例性地,控制装置43可以是上位机,也可以是下位机。其中,控制装置43除了可以用于控制晶圆承载面的各个温度控制区的目标控制温度之外,还可以通过控制半导体工艺设备的进气组件的阀门开启,以向工艺腔室41内通入相应的工艺气体;控制装置43还可以控制进气组件的阀门的开合度来控制工艺气体的流量。控制装置43还可以通过控制抽气组件对工艺腔室的内部进行抽气,例如控制抽气组件的阀门开度或抽气泵转速等,实现控制工艺腔室41内部的压强,排出反应副产物等。该半导体工艺设备还可以包括射频线圈,控制装置43还用于控制射频电源向射频线圈提供射频功率,激发工艺腔室41内部的工艺气体产生等离子体。控制装置43还用于控制射频电源向晶圆承载装置42提供射频功率,以提供射频偏压。由此,半导体工艺设备可以实现对晶圆承载装置42上的晶圆进行加工。
本申请上文实施例中重点描述的是各个实施例之间的不同,各个实施例之间不同的优化特征只要不矛盾,均可以组合形成更优的实施例,考虑到行文简洁,在此则不再赘述。
以上所述仅为本申请的实施例而已,并不用于限制本申请。对于本领域技术人员来说,本申请可以有各种更改和变化。凡在本申请的精神和原理之内所作的任何修改、等同替换、改进等,均应包含在本申请的权利要求范围之内。
Claims (24)
- 一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个主温度控制区和多个辅温度控制区,多个所述主温度控制区在所述晶圆承载面的径向方向上依次设置,位于径向方向外侧的所述主温度控制区环绕位于径向方向内侧的所述主温度控制区设置,多个所述辅温度控制区沿所述晶圆承载装置的角向设置,其特征在于,所述方法包括:获取待刻蚀或沉积晶圆在各个所述主温度控制区的基本温度下,沿径向方向的第一基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述第一基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;利用预设的第一刻蚀或沉积速率预测模型,根据第一目标刻蚀或沉积速率分布数据、所述第一基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述主温度控制区的目标温度控制值;其中,所述第一刻蚀或沉积速率预测模型与刻蚀或沉积工艺过程中产生的径向方向的刻蚀副产物或沉积物扩散相关联,所述第一刻蚀或沉积速率预测模型用于表征所述晶圆承载面上径向方向的各个位置的刻蚀或沉积速率与相关联位置的对应关系,所述第一目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的目标刻蚀或沉积速率值。
- 根据权利要求1所述的晶圆刻蚀或沉积方法,其特征在于,所述方法还包括:获取待刻蚀或沉积晶圆在各个所述辅温度控制区的基本温度下,沿角向方向的第二基本刻蚀或沉积速率分布数据以及所述温度敏感度值;其中,所述第二基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上角向方向的位置相关联的刻蚀或沉积速率值;利用预设的第二刻蚀或沉积速率预测模型,根据第二目标刻蚀或沉积速率分布数据、所述第二基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述辅温度控制区的目标温度控制值;其中,所述第二刻蚀或沉积速率预测模型与刻蚀或沉积工艺过程中产生的角向方向的刻蚀副产物或沉积物扩散相关联,所述第二刻蚀或沉积速率预测模型用于表征所述晶圆承载面上角向方向的各个位置的刻蚀或沉积速率与相关联位置的对应关系,所述第二目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上角向方向的位置相关联的目标刻蚀或沉积速率值。
- 根据权利要求2所述的晶圆刻蚀或沉积方法,其特征在于,所述第一刻蚀或沉积速率预测模型与各个所述主温度控制区的第一刻蚀或沉积速率预测子模型相关联,各个第一刻蚀或沉积速率预测子模型分别用于表征对应的所述主温度控制区的温度控制值发生改变时,所述晶圆承载面上径向方向的各个位置的刻蚀或沉积速率与相关联位置的对应关系;或者所述第二刻蚀或沉积速率预测模型与各个所述辅温度控制区的第二刻蚀或沉积速率预测子模型相关联,各个第二刻蚀或沉积速率预测子模型分别用于表征对应的所述辅温度控制区的温度控制值发生改变时,所述晶圆承载面上角向方向的各个位置的刻蚀或沉积速率与相关联位置的对应关系。
- 根据权利要求3所述的晶圆刻蚀或沉积方法,其特征在于,获取所述第一刻蚀或沉积速率预测子模型的步骤包括:获取待刻蚀或沉积晶圆的所述第一基本刻蚀或沉积速率分布数据以及所述温度敏感度值;改变所述主温度控制区中的一个主温度控制区的温度控制值,并保持其余主温度控制区仍为所述基本温度,获取沿径向方向的改变后的刻蚀或沉积速率分布数据;获取所改变的主温度控制区的第一刻蚀或沉积速率预测子模型,所述第一刻蚀或沉积速率预测子模型与所述第一基本刻蚀或沉积速率分布数据、所述改变后的刻蚀或沉积速率分布数据、所述基本温度、所改变的主温度控制区的温度控制值以及所述温度敏感度值相关。
- 根据权利要求3所述的晶圆刻蚀或沉积方法,其特征在于,获取所述第二刻蚀或沉积速率预测子模型的步骤包括:获取待刻蚀或沉积晶圆的所述第二基本刻蚀或沉积速率分布数据以及所述温度敏感度值;改变所述辅温度控制区中的一个辅温度控制区的温度控制值,并保持其余辅温度控制区仍为所述基本温度,获取沿角向方向的改变后的刻蚀或沉积速率分布数据;获取所改变的辅温度控制区的第二刻蚀或沉积速率预测子模型,所述第二刻蚀或沉积速率预测子模型与所述第二基本刻蚀或沉积速率分布数据、所述改变后的刻蚀或沉积速率分布数据、所述基本温度、所改变的辅温度控制区的温度控制值以及所述温度敏感度值相关。
- 一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,其特征在于,所述方法包括:获取待刻蚀或沉积晶圆在各个所述温度控制区的基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;利用预设的刻蚀或沉积速率预测模型,根据目标刻蚀或沉积速率分布数据、所述基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述温度控制区的目标温度控制值;其中,所述刻蚀或沉积速率预测模型与刻蚀或沉积工艺过程中产生的刻蚀副产物或沉积物扩散相关联,所述刻蚀或沉积速率预测模型用于表征所述晶圆承载面上的各个位置的刻蚀或沉积速率与相关联位置的对应关系,所述目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的目标刻蚀或沉积速率值。
- 一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,其特征在于,所述方法包括:获取待刻蚀或沉积晶圆在各个所述温度控制区的基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;利用预设的刻蚀或沉积速率预测模型,根据目标刻蚀或沉积速率分布数据、所述基本刻蚀或沉积速率分布数据以及所述温度敏感度分布数据,获取各个所述温度控制区的目标温度控制值;其中,所述刻蚀或沉积速率预测模型用于表征任意所述温度控制区的温度控制值发生改变时,所述晶圆承载面上的所有位置均受所改变的温度控制区的影响,各个位置改变后的刻蚀或沉积速率与相应位置的对应关系,所述目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的目标刻蚀或沉积速率值。
- 根据权利要求6或7所述的晶圆刻蚀或沉积方法,其特征在于,所述刻蚀或沉积速率预测模型与各个所述温度控制区的刻蚀或沉积速率预测子模型相关联,各个刻蚀或沉积速率预测子模型分别用于表征对应的所述温度控制区的温度控制值发生改变时,所述晶圆承载面上的各个位置的刻蚀或沉积速率与相关联位置的对应关系。
- 根据权利要求6或7所述的晶圆刻蚀或沉积方法,其特征在于,获取所述刻蚀或沉积速率预测子模型的步骤包括:获取待刻蚀或沉积晶圆在各个所述温度控制区均处于基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;改变所述温度控制区中的一个温度控制区的温度控制值,并保持其余温度控制区仍为所述基本温度,获取改变后的刻蚀或沉积速率分布数据;获取所改变的温度控制区的刻蚀或沉积速率预测子模型,所述刻蚀或沉积速率预测子模型与所述基本刻蚀或沉积速率分布数据、所述改变后的刻蚀或沉积速率分布数据、所述基本温度、所改变的温度控制区的温度控制值以及所述温度敏感度值相关。
- 根据权利要求9所述的晶圆刻蚀或沉积方法,其特征在于,所述刻蚀或沉积速率预测子模型[M]sub由下式表示:
其中,Tbase表示基本温度,T1表示所改变的温度控制区的温度控制值,[ER]1表示所述改变后的刻蚀或沉积速率分布数据,[ER]base表示所述晶圆承载装置的全部所述温度控制区的温度控制值均为Tbase时的基本刻蚀或沉积速率分布数据,[Sen]表示温度敏感度值;所述温度敏感度值[Sen]由下式表示:
其中,[ER]2表示所述晶圆承载装置的全部所述温度控制区的温度控制值均为T2时的刻蚀或沉积速率分布数据。 - 根据权利要求10所述的晶圆刻蚀或沉积方法,其特征在于,获取所述刻蚀或沉积速率预测子模型还包括:采用平滑曲线来拟合所述公式(1)计算得到的数据,并采用分段函数来表征所述平滑曲线;或者通过所述公式(1)计算得到的数据来训练得到神经网络模型。
- 根据权利要求9所述的晶圆刻蚀或沉积方法,其特征在于,所述晶圆承载装置包括n个温度控制区,n为大于或等于2的整数,所述刻蚀或沉积速率预测模型由下式表示:
其中,[ER]target表示所述晶圆承载装置的各个所述温度控制区处于相应的目标温度控制值时的目标刻蚀或沉积速率分布数据,[ER]base表示所述晶圆承载装置的全部所述温度控制区的温度控制值均为Tbase时的基本刻蚀或沉积速率分布数据,[Sen]表示温度敏感度值;Ttarget1表示第一温度控制区的目标温度控制值,Ttarget2表示第二温度控制区的目标温度控制值,直至Ttargetn表示第n温度控制区的目标温度控制值,[M]1表示第一温度控制区的刻蚀或沉积速率预测子模型,[M]2表示第二温度控制区的刻蚀或沉积速率预测子模型,直至[M]n表示第n温度控制区的刻蚀或沉积速率预测子模型。 - 根据权利要求10或11所述的晶圆刻蚀或沉积方法,其特征在于,所述晶圆承载装置包括n个温度控制区,n为大于或等于2的整数,所述刻蚀或沉积速率预测模型由下式表示:
其中,[ER]target表示所述晶圆承载装置的各个所述温度控制区处于相应的目标温度控制值时的目标刻蚀或沉积速率分布数据,[ER]base表示所述晶圆承载装置的全部所述温度控制区的温度控制值均为Tbase时的基本刻蚀或沉积速率分布数据,[Sen]表示温度敏感度值;Ttarget1表示第一温度控制区的目标温度控制值,Ttarget2表示第二温度控制区的目标温度控制值,直至Ttargetn表示第n温度控制区的目标温度控制值,[M]1表示第一温度控制区的刻蚀或沉积速率预测子模型,[M]2表示第二温度控制区的刻蚀或沉积速率预测子模型,直至[M]n表示第n温度控制区的刻蚀或沉积速率预测子模型。 - 一种用于获取刻蚀或沉积速率预测模型的方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,其特征在于,所述方法包括:获取待刻蚀或沉积晶圆在各个所述温度控制区均处于基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;改变所述温度控制区中的一个温度控制区的温度控制值,并保持其余温度控制区仍为所述基本温度,获取改变后的刻蚀或沉积速率分布数据;获取所改变的温度控制区的刻蚀或沉积速率预测子模型,所述刻蚀或沉积速率预测子模型与所述基本刻蚀或沉积速率分布数据、所述改变后的刻蚀或沉积速率分布数据、所述基本温度、所改变的温度控制区的温度控制值以及所述温度敏感度值相关;重复改变所述温度控制区中的另一个温度控制区的温度控制值,并保持其余温度控制区仍为基本温度,获取改变后的刻蚀或沉积速率分布数据,并获取所改变的温度控制区的刻蚀或沉积速率预测子模型,直至获取全部所述温度控制区的刻蚀或沉积速率预测子模型;根据各个所述温度控制区的刻蚀或沉积速率预测子模型得到所述刻蚀或沉积速率预测模型。
- 根据权利要求14所述的方法,其特征在于,所述刻蚀或沉积速率预测子模型[M]sub由下式表示:
其中,Tbase表示基本温度,T1表示所改变的温度控制区的温度控制值,[ER]1表示改变后的刻蚀或沉积速率分布数据,[ER]base表示所述晶圆承载装置的全部所述温度控制区的温度控制值均为Tbase时的基本刻蚀或沉积速率分布数据,[Sen]表示温度敏感度值;所述温度敏感度值[Sen]由下式表示:
其中,[ER]2表示所述晶圆承载装置的全部所述温度控制区的温度控制值均为T2时的刻蚀或沉积速率分布数据。 - 根据权利要求15所述的方法,其特征在于,获取所述刻蚀或沉积速率预测子模型还包括:采用平滑曲线来拟合所述公式(1)计算得到的数据,并采用分段函数来表征所述平滑曲线;或者通过所述公式(1)计算得到的数据来训练得到神经网络模型。
- 根据权利要求14所述的方法,其特征在于,所述晶圆承载装置包括n个温度控制区,n为大于或等于2的整数,所述刻蚀或沉积速率预测模型由下式表示:
其中,[ER]target表示所述晶圆承载装置的各个所述温度控制区处于相应的目标温度控制值时的目标刻蚀或沉积速率分布数据,[ER]base表示所述晶圆承载装置的全部所述温度控制区的温度控制值均为Tbase时的基本刻蚀或沉积速率分布数据,[Sen]表示温度敏感度值;Ttarget1表示第一温度控制区的目标温度控制值,Ttarget2表示第二温度控制区的目标温度控制值,直至Ttargetn表示第n温度控制区的目标温度控制值,[M]1表示第一温度控制区的刻蚀或沉积速率预测子模型,[M]2表示第二温度控制区的刻蚀或沉积速率预测子模型,直至[M]n表示第n温度控制区的刻蚀或沉积速率预测子模型。 - 根据权利要求14至17中任一项所述的方法,其特征在于,多个所述温度控制区包括多个主温度控制区和多个辅温度控制区,多个所述主温度控制区在所述晶圆承载面的径向方向上依次设置,位于径向方向外侧的所述主温度控制区环绕位于径向方向内侧的所述主温度控制区设置,多个所述辅温度控制区沿所述晶圆承载装置的角向设置;所述刻蚀或沉积速率预测模型包括第一刻蚀或沉积速率预测模型,所述第一刻蚀或沉积速率预测模型用于表征所述晶圆承载面上径向方向的各个位置的刻蚀或沉积速率与相关联位置的对应关系;所述获取待刻蚀或沉积晶圆在各个所述温度控制区均处于基本温度下的基本刻蚀或沉积速率分布数据包括:获取所述待刻蚀或沉积晶圆在各个所述主温度控制区均处于基本温度下,沿径向方向的第一基本刻蚀或沉积速率分布数据,其中,所述第一基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的刻蚀或沉积速率值;所述获取改变后的刻蚀或沉积速率分布数据包括:改变所述主温度控制区中的一个主温度控制区的温度控制值,并保持其余主温度控制区仍为所述基本温度,获取沿径向方向的改变后的刻蚀或沉积速率分布数据;所述获取所改变的温度控制区的刻蚀或沉积速率预测子模型包括:获取所改变的主温度控制区的第一刻蚀或沉积速率预测子模型,所述第一刻蚀或沉积速率预测子模型与所述第一基本刻蚀或沉积速率分布数据、所述改变后的刻蚀或沉积速率分布数据、所述基本温度、所改变的主温度控制区的温度控制值以及所述温度敏感度值相关;所述根据各个所述温度控制区的刻蚀或沉积速率预测子模型得到所述刻蚀或沉积速率预测模型包括:根据各个所述主温度控制区的第一刻蚀或沉积速率预测子模型得到所述第一刻蚀或沉积速率预测模型。
- 根据权利要求14至17中任一项所述的方法,其特征在于,多个所述温度控制区包括多个主温度控制区和多个辅温度控制区,多个所述主温度控制区在所述晶圆承载面的径向方向上依次设置,位于径向方向外侧的所述主温度控制区环绕位于径向方向内侧的所述主温度控制区设置,多个所述辅温度控制区沿所述晶圆承载装置的角向设置;所述刻蚀或沉积速率预测模型还包括第二刻蚀或沉积速率预测模型,所述第二刻蚀或沉积速率预测模型用于表征所述晶圆承载面上角向方向的各个位置的刻蚀或沉积速率与相关联位置的对应关系;所述获取待刻蚀或沉积晶圆在各个所述温度控制区均处于基本温度下的基本刻蚀或沉积速率分布数据还包括:获取所述待刻蚀或沉积晶圆在各个所述辅温度控制区均处于基本温度下,沿角向方向的第二基本刻蚀或沉积速率分布数据,其中,所述第二基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上角向方向的位置相关联的刻蚀或沉积速率值;所述获取改变后的刻蚀或沉积速率分布数据还包括:改变所述辅温度控制区中的一个辅温度控制区的温度控制值,并保持其余辅温度控制区仍为所述基本温度,获取沿角向方向的改变后的刻蚀或沉积速率分布数据;所述获取所改变的温度控制区的刻蚀或沉积速率预测子模型还包括:获取所改变的辅温度控制区的第二刻蚀或沉积速率预测子模型,所述第二刻蚀或沉积速率预测子模型与所述第二基本刻蚀或沉积速率分布数据、所述改变后的刻蚀或沉积速率分布数据、所述基本温度、所改变的辅温度控制区的温度控制值以及所述温度敏感度值相关;所述根据各个所述温度控制区的刻蚀或沉积速率预测子模型得到所述刻蚀或沉积速率预测模型包括:根据各个所述辅温度控制区的第二刻蚀或沉积速率预测子模型得到所述第二刻蚀或沉积速率预测模型。
- 一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个温度控制区,其特征在于,所述方法包括:获取待刻蚀或沉积晶圆在各个所述温度控制区的基本温度下的基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;利用根据权利要求14至19中任一项所述的方法得到的刻蚀或沉积速率预测模型,根据目标刻蚀或沉积速率分布数据、所述基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述温度控制区的目标温度控制值;其中,所述目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上的位置相关联的目标刻蚀或沉积速率值。
- 一种晶圆刻蚀或沉积方法,所述方法应用于具有晶圆承载装置的工艺腔室,所述晶圆承载装置的晶圆承载面具有多个主温度控制区和多个辅温度控制区,多个所述主温度控制区在所述晶圆承载面的径向方向上依次设置,位于径向方向外侧的所述主温度控制区环绕位于径向方向内侧的所述主温度控制区设置,多个所述辅温度控制区沿所述晶圆承载装置的角向设置,其特征在于,所述方法包括:获取待刻蚀或沉积晶圆在各个所述主温度控制区的基本温度下,沿径向方向的第一基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述第一基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;利用根据权利要求18所述的方法得到的第一刻蚀或沉积速率预测模型,根据第一目标刻蚀或沉积速率分布数据、所述第一基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述主温度控制区的目标温度控制值;其中,所述第一目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上径向方向的位置相关联的目标刻蚀或沉积速率值。
- 根据权利要求21所述的方法,其特征在于,还包括:获取待刻蚀或沉积晶圆在各个所述辅温度控制区的基本温度下,沿径向方向的第二基本刻蚀或沉积速率分布数据以及温度敏感度值;其中,所述第二基本刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上角向方向的位置相关联的刻蚀或沉积速率值,所述温度敏感度值用于表征刻蚀或沉积速率随温度的变化率;利用根据权利要求19所述的方法得到的第二刻蚀或沉积速率预测模型,根据第二目标刻蚀或沉积速率分布数据、所述第二基本刻蚀或沉积速率分布数据以及所述温度敏感度值,获取各个所述辅温度控制区的目标温度控制值;其中,所述第二目标刻蚀或沉积速率分布数据包括多个与所述晶圆承载面上角向方向的位置相关联的目标刻蚀或沉积速率值。
- 一种半导体工艺设备,其特征在于,包括:工艺腔室;晶圆承载装置,设置在所述工艺腔室内,所述晶圆承载装置的晶圆承载面具有多个温度控制区;控制装置,包括至少一个处理器和至少一个存储器,所述存储器中存储有计算机程序,所述计算机程序被所述处理器执行时实现根据权利要求1至22中任一项所述的方法。
- 一种半导体工艺设备,其特征在于,包括:工艺腔室;晶圆承载装置,设置在所述工艺腔室内,所述晶圆承载装置的晶圆承载面具有多个温度控制区;控制装置,包括至少一个处理器和至少一个存储器,所述存储器中存储有根据权利要求14至19中任一项所述的方法得到的刻蚀或沉积速率预测模型。
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