JP2009076542A - Method and apparatus for forming film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a film wherein oxygen shortage scarcely occurs when an oxide film is formed by an ALD method. <P>SOLUTION: When a workpiece is inserted into a treatment container which can be held vacuum, the inside of the treatment container is held in a vacuum state, and the step of supplying film forming raw material therein (step S1) and the step of supplying oxidant therein (step S2) are repeated two or more times to form an oxide film on a substrate, the step of supplying oxidant (step S2) repeats the supply of the oxidant two or more times with the vacuum suction being interposed between the successive supplies. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a film forming method and a film forming apparatus for forming an oxide film such as a ZrO ₂ film on a substrate to be processed such as a semiconductor wafer.

  In recent years, design rules for semiconductor elements constituting an LSI have been increasingly miniaturized due to demands for higher integration and higher speed of the LSI. Accordingly, in the CMOS device, a further reduction in the thickness of the gate insulating film is required, and accordingly, a higher dielectric constant of the gate insulating film material is aimed at. In addition, an increase in capacitance of a capacitor used in a DRAM or the like is also demanded, and a dielectric film having a high dielectric constant is demanded.

  On the other hand, the flash memory is required to further improve the reliability, and therefore, a high dielectric constant of the insulating film between the control gate and the floating gate is required.

As a high dielectric constant material applicable to these uses, an oxide material such as a zirconium oxide (ZrO ₂ ) film has been studied (for example, Patent Document 1). Conventionally, a zirconium oxide film has been formed by CVD (MOCVD) using an organic metal raw material, for example, tetrakisethylmethylaminozirconium (TEMAZ) is used as a raw material gas (precursor), and, for example, O ₃ gas is used as an oxidizing agent. An ALD process for alternately supplying these using a laser is proposed (for example, Patent Document 2).

In the above method, in the step of supplying O ₃ gas as an oxidizing agent, a large amount of TEMAZ groups and reaction product gas of them and O ₃ gas are released. For this reason, oxidizing species such as O ₃ molecules or O radicals that contribute to the formation of the ZrO ₂ film need to reach the reaction surface while scavenging these large amounts of released gas. In particular, DRAM capacitors have narrow holes with a large aspect ratio, and it is not easy for sufficient oxidizing species to reach the bottom of such holes. Therefore, oxidation tends to be insufficient at the center of the wafer and at the bottom of the DRAM capacitor.
JP 2001-152339 A JP 2006-310754 A

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a film forming method and a film forming apparatus in which oxidation deficiency hardly occurs when an oxide film is formed by an ALD technique.
Furthermore, it aims at providing the storage medium with which the program which performs such a film-forming method was stored.

  In order to solve the above-described problem, in the first aspect of the present invention, an object to be processed is inserted into a processing container that can be held in a vacuum, and the processing container is held in a vacuum, and a film forming raw material is placed therein. The step of supplying and the step of supplying the oxidant therein are repeated a plurality of times to form an oxide film on the substrate, wherein the step of supplying the oxidant includes supplying the oxidant and vacuuming There is provided a film forming method characterized by alternately repeating pulling.

  In the first aspect, it is preferable to include a step of discharging the gas in the processing container between the step of supplying the film forming raw material and the step of supplying the oxidizing agent. In this case, it is preferable that the step of discharging the gas repeats the evacuation in the processing container and the purge with the purge gas a plurality of times. Moreover, it is preferable that the number of times of supplying the oxidizing agent is 2 to 10 times.

Further, the oxidant includes at least one selected from radicals of O ₃ gas, H ₂ O gas, O ₂ gas, NO ₂ gas, NO gas, N ₂ O gas, O ₂ gas and H ₂ gas. Can be used. An organometallic compound can be used as the film forming material. A suitable example of the oxide film is a ZrO ₂ film.

  According to a second aspect of the present invention, there is provided a film forming apparatus for forming a metal oxide film on an object to be processed, the processing container having a vertical cylindrical shape that can be held in vacuum, and the object to be processed. A holding member that is held in the processing container in a state of being held in a plurality of stages, a heating device provided on an outer periphery of the processing container, a film forming raw material supply mechanism that supplies a film forming raw material into the processing container, An oxidant supply mechanism for supplying an oxidant into the processing vessel; and a control mechanism for controlling the supply of the film forming raw material and the oxidant. The control mechanism is in a state where the inside of the processing vessel is maintained in a vacuum state. The step of supplying the film forming raw material therein and the step of supplying the oxidant therein are repeated a plurality of times, and when the oxide film is formed on the substrate, the step of supplying the oxidant includes vacuum drawing. To supply the oxidant repeatedly several times To provide a film forming apparatus characterized.

  In the second aspect, the control mechanism remains in the processing container between the step of supplying the film forming raw material into the processing container and the step of supplying the oxidizing agent into the processing container. It is preferable to control so as to insert a step of removing the gas. In this case, it is preferable that the control mechanism performs control so that the step of removing the gas is performed by repeating evacuation in the processing container and purging with a purge gas a plurality of times. Moreover, it is preferable that the said control mechanism controls so that the repetition frequency of supply of an oxidizing agent may be 2-10 times.

  According to a third aspect of the present invention, there is provided a storage medium that stores a program that operates on a computer and controls a film forming apparatus, and the program performs the method according to the first aspect at the time of execution. In addition, a storage medium characterized by causing a computer to control the film forming apparatus is provided.

  According to the present invention, when the oxide film is formed by repeating the step of supplying the film forming material and the step of supplying the oxidant a plurality of times, the step of supplying the oxidant is performed by supplying the oxidant and the vacuum. Since it is performed by alternately repeating the pulling, the oxidant can be supplied after the gas generated by the supply of the oxidant is discharged halfway, and the oxidant easily reaches the reaction surface. Accordingly, it is possible to make it difficult to cause insufficient oxidation when forming the oxide film.

  Furthermore, the present invention is a storage medium that stores a program that operates on a computer and controls a film forming apparatus, and the program is stored in the computer so that the film forming method is performed at the time of execution. A storage medium characterized by controlling a film formation apparatus is provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a longitudinal sectional view showing an example of a film forming apparatus for carrying out the film forming method of the present invention, FIG. 2 is a transverse sectional view showing the film forming apparatus of FIG. 1, and FIG. It is a timing chart which shows the timing of supply of the gas in an example. In FIG. 2, the heating device is omitted.

  The film forming apparatus 100 includes a cylindrical processing container 1 having a ceiling with a lower end opened. The entire processing container 1 is made of, for example, quartz, and a ceiling plate 2 made of quartz is provided on the ceiling in the processing container 1 and sealed. In addition, a manifold 3 formed in a cylindrical shape from, for example, stainless steel is connected to the lower end opening of the processing container 1 via a seal member 4 such as an O-ring.

  The manifold 3 supports the lower end of the processing container 1, and a large number of, for example, 50 to 100 semiconductor wafers (hereinafter simply referred to as wafers) W can be mounted in multiple stages as objects to be processed from below the manifold 3. A quartz wafer boat 5 made of quartz can be inserted into the processing container 1. The wafer boat 5 has three columns 6 (see FIG. 2), and a large number of wafers W are supported by grooves formed in the columns 6.

  The wafer boat 5 is placed on a table 8 via a quartz heat insulating cylinder 7, and the table 8 passes through a lid 9 made of, for example, stainless steel that opens and closes the lower end opening of the manifold 3. It is supported on the rotating shaft 10.

  And the magnetic fluid seal | sticker 11 is provided in the penetration part of this rotating shaft 10, for example, and the rotating shaft 10 is supported rotatably, sealing airtightly. Further, a sealing member 12 made of, for example, an O-ring is interposed between the peripheral portion of the lid portion 9 and the lower end portion of the manifold 3, thereby maintaining the sealing performance in the processing container 1.

  The rotary shaft 10 is attached to the tip of an arm 13 supported by an elevating mechanism (not shown) such as a boat elevator, for example, and moves up and down the wafer boat 5 and the lid 9 etc. integrally. 1 is inserted into and removed from the inside. The table 8 may be fixedly provided on the lid 9 side, and the wafer W may be processed without rotating the wafer boat 5.

Further, the film forming apparatus 100 includes an oxidizing agent supply mechanism 14 that supplies a gaseous oxidant, for example, O ₃ gas, into the processing container 1, and a Zr source gas supply mechanism 15 that supplies a Zr source gas into the processing container 1. And a purge gas supply mechanism 16 for supplying an inert gas such as N ₂ gas as a purge gas into the processing container 1.

The oxidant supply mechanism 14 is connected to the oxidant supply source 17, an oxidant pipe 18 that guides the oxidant from the oxidant supply source 17, and the oxidant pipe 18. And an oxidant dispersion nozzle 19 made of a quartz tube bent in the direction and extending vertically. A plurality of gas discharge holes 19a are formed at a predetermined interval in the vertical portion of the oxidant dispersion nozzle 19, and the oxidant is substantially uniformly directed from the gas discharge holes 19a toward the processing container 1 in the horizontal direction. For example, O ₃ gas can be discharged.

The Zr source gas supply mechanism 15 includes a Zr source reservoir 20 in which a liquid Zr source L that is a film forming raw material is stored, and a Zr source pipe 21 that guides a liquid Zr source from the Zr source reservoir 20. The vaporizer 22 is connected to the Zr source pipe 21 and vaporizes the Zr source, the Zr source gas pipe 23 that guides the Zr source gas generated by the vaporizer 22, and the Zr source gas pipe 23 is connected to the manifold 3 And a Zr source gas dispersion nozzle 24 made of a quartz tube bent upward and penetrating inwardly. The vaporizer 22 is connected to a carrier gas pipe 22a that supplies N ₂ gas as a carrier gas. Here, two Zr source gas dispersion nozzles 24 are provided so as to sandwich the oxygen-containing gas dispersion nozzle 19 (see FIG. 2), and each Zr source gas dispersion nozzle 24 includes a plurality of Zr source gas dispersion nozzles 24 along its length direction. The gas discharge holes 24a are formed at predetermined intervals so that the Zr source gas can be discharged from the gas discharge holes 24a into the processing container 1 in a horizontal direction substantially uniformly. Note that only one Zr source gas dispersion nozzle 24 may be provided.

Further, the purge gas supply mechanism 16 includes a purge gas supply source 25, a purge gas pipe 26 that guides the purge gas from the purge gas supply source 25, and a purge gas nozzle 27 that is connected to the purge gas pipe 26 and provided through the side wall of the manifold 3. have. As the purge gas, an inert gas such as N ₂ gas can be preferably used.

  The oxidant pipe 18 is provided with an on-off valve 18a and a flow rate controller 18b such as a mass flow controller so that a gaseous oxidant can be supplied while controlling the flow rate. The purge gas pipe 26 is also provided with an on-off valve 26a and a flow rate controller 26b such as a mass flow controller so that the purge gas can be supplied while controlling the flow rate.

  A Zr source pumping pipe 20a is inserted into the Zr source reservoir 20, and a Zr source of liquid is supplied to the Zr source pipe 21 by supplying a pumping gas such as He gas from the Zr source pumping pipe 20a. Is done. The Zr source pipe 21 is provided with a flow rate controller 21a such as a liquid mass flow controller, and the Zr source gas pipe 23 is provided with a valve 23a.

  As the Zr source, an organic metal compound that is liquid at room temperature, for example, tetrakisethylmethylaminozirconium (TEMAZ) can be suitably used. In addition, tetrakisdiethylaminozirconium (TDEAZ) can also be used as the organometallic compound that is liquid at room temperature. Of course, a solid material can be used at room temperature, but in this case, a mechanism for evaporating the raw material, a mechanism for heating the piping, and the like are required.

  An exhaust port 37 for evacuating the inside of the processing container 1 is provided in a portion of the processing container 1 opposite to the oxidant dispersion nozzle 19 and the Zr source gas dispersion nozzle 24. The exhaust port 37 is formed in an elongated shape by scraping the side wall of the processing container 1 in the vertical direction. An exhaust port cover member 38 having a U-shaped cross section so as to cover the exhaust port 37 is attached to a portion corresponding to the exhaust port 37 of the processing container 1 by welding. The exhaust port cover member 38 extends upward along the side wall of the processing container 1, and defines a gas outlet 39 above the processing container 1. The gas outlet 39 is evacuated by a vacuum exhaust mechanism including a vacuum pump (not shown). A cylindrical heating device 40 for heating the processing container 1 and the wafer W inside the processing container 1 is provided so as to surround the outer periphery of the processing container 1.

  Control of each component of the film forming apparatus 100, for example, supply / stop of each gas by opening / closing valves 18a, 23a, 26a, control of the flow rate of gas and liquid source by the flow rate controllers 18b, 21a, 26b, The control and the like are performed by a controller 50 composed of, for example, a microprocessor (computer). Connected to the controller 50 is a user interface 51 including a keyboard for an operator to input commands for managing the film forming apparatus 100, a display for visualizing and displaying the operating status of the film forming apparatus 100, and the like. Yes.

  Further, the controller 50 causes each component of the film forming apparatus 100 to execute processes according to a control program for realizing various processes executed by the film forming apparatus 100 under the control of the controller 50 and processing conditions. A storage unit 52 that stores a program for storing the recipe, that is, a recipe, is connected. The recipe is stored in a storage medium in the storage unit 52. The storage medium may be a fixed medium such as a hard disk or a portable medium such as a CDROM, DVD, or flash memory. Moreover, you may make it transmit a recipe suitably from another apparatus via a dedicated line, for example.

  Then, if necessary, an arbitrary recipe is called from the storage unit 52 by an instruction from the user interface 51 and is executed by the controller 50, so that a desired process in the film forming apparatus 100 is performed under the control of the controller 50. Is done.

  Next, a film forming method according to this embodiment performed using the film forming apparatus configured as described above will be described with reference to FIG.

  First, at normal temperature, for example, a wafer boat 5 loaded with 50 to 100 wafers W is loaded into the processing container 1 controlled in advance at a predetermined temperature by raising it from below, and the lid 9 By closing the lower end opening of the manifold 3, the inside of the processing container 1 is made a sealed space. An example of the wafer W is 300 mm in diameter.

  Then, the inside of the processing vessel 1 is evacuated to maintain a predetermined process pressure, and the power supplied to the heating device 40 is controlled to increase the wafer temperature to maintain the process temperature, and the wafer boat 5 is rotated. The film forming process is started in this state.

As shown in FIG. 3 (see also FIG. 4 showing a specific time schedule to be described later), the film forming process at this time includes, for example, a step S1 for supplying and adsorbing a Zr source gas and a gaseous oxidant, for example. Step S2 in which O ₃ gas is supplied to the processing container 1 to oxidize the Zr source gas is alternately repeated, and a process S3 for removing gas remaining in the processing container 1 from the processing container 1 between these processes is performed. carry out. The process temperature at this time is set to 200 to 250 ° C. Note that the evacuation in FIG. 3 is different from the exhaust when the gas is flowing, and means the exhaust state for discharging the gas component from the processing container 1 without supplying the gas.

  Specifically, in step S1, for example, TEMAZ is supplied as a Zr source from the Zr source reservoir 20 of the Zr source gas supply mechanism 15, and the Zr source gas generated by vaporizing the vaporizer 22 is supplied to the Zr source gas pipe 23. Then, the gas is supplied from the gas discharge hole 24a into the processing container 1 through the Zr source gas dispersion nozzle 24 during the period T1. Thereby, the Zr source is adsorbed on the wafer. The period T1 at this time is exemplified by 1 to 120 seconds. The flow rate of the Zr source gas is exemplified by 0.2 to 0.5 mL / min (ccm). Moreover, 10-100 Pa is illustrated for the pressure in the processing container 1 in this case.

In the step of supplying the oxidant in step S2, for example, O ₃ gas is supplied as an oxidant from the oxidant supply source 17 of the oxidant supply mechanism 14 from the gas discharge hole 19a through the oxidant pipe 18 and the oxidant dispersion nozzle 19. Discharge. Thereby, the Zr source adsorbed on the wafer W is oxidized to form ZrO ₂ .

  Conventionally, the oxidant supply process has merely flowed the oxidant for a predetermined period. In this case, however, an organic group such as a TEMAZ group desorbed from the Zr source gas and the oxidant react with it. As a result, a large amount of the generated gas is generated, and the oxidant hardly reaches the reaction surface.

Therefore, in this embodiment, in the step of supplying the oxidant in step S2, the supply of the oxidant is repeated a plurality of times with vacuuming interposed therebetween. As a result, the gas component generated by supplying the oxidant first is removed during evacuation, and when the next oxidant is supplied, the oxidant quickly reaches the reaction surface to ensure the oxide. Is formed. For this reason, it is difficult to cause insufficient oxidation even at the bottom of a narrow hole having a very large aspect ratio such as a capacitor of a DRAM. In the example of FIG. 3, the supply of O ₃ gas that is an oxidant is repeated three times with vacuuming in step S2.

The total period T2 of this step S2 is preferably in the range of 33 to 420 seconds. Further, the number of repetitions of supplying the oxidant is effective even twice, but if the number is too large, the total time increases, so 2 to 10 times are preferable, and more preferably 2 to 3 times. The time for supplying the oxidizing agent per time is preferably in the range of 10 to 120 seconds, and the time for vacuuming per time is preferably 1 to 20 seconds. Although the flow rate of the oxidizing agent varies depending on the number of wafers W mounted and the type of oxidizing agent, when O ₃ gas is used as the oxidizing agent and the number of wafers W mounted is about 50 to 100, 100 to 200 g / Nm ³ is obtained. Illustrated. Moreover, 10-100 Pa is illustrated for the pressure in the processing container 1 in this case.

In this case, as the oxidizing agent, H ₂ O gas, O ₂ gas, NO ₂ gas, NO gas, N ₂ O gas and the like can be used in addition to the O ₃ gas. A plasma generation mechanism may be provided to increase the reactivity by converting the oxidant into plasma. Further, radical oxidation using O ₂ gas and H ₂ gas may be used. When O ₃ gas is used, the oxidant supply source 17 is provided with an ozonizer that generates O ₃ gas.

  Further, step S3 performed between step S1 and step S2 is a step of removing a gas remaining in the processing container 1 after step S1 or after step S2 and causing a desired reaction in the next step. Yes, the evacuation of the processing container 1 and the supply of the purge gas from the purge gas supply source 25 of the purge gas supply mechanism 16 are repeated a plurality of times. The reason why the evacuation and the supply of the purge gas are repeated in this manner is to increase the removal efficiency of the remaining gas. In the example of FIG. 3, evacuation and supply of purge gas are repeated three times. However, since the last of step S2 is vacuuming, the first vacuuming is omitted after step S2.

  The total period T3 of the step 3 is exemplified by 5 to 60 sec. In addition, the number of repetitions of evacuation and supply of purge gas is effective even two times. However, if the number of times is too large, the total time increases, so two to three times are preferable. Further, the time for evacuation per time is preferably in the range of 1 to 5 seconds, and the purge time per time is preferably 1 to 15 seconds. The purge gas flow rate is exemplified by 0.5 to 20 mL / min (sccm). At this time, the step S3 after the step S1 for supplying the Zr source gas and the step S3 after the step S2 for supplying the oxidizing agent are evacuated and purged gas supply time due to the difference in the discharge of both gases. May be changed. Specifically, since it takes more time for the gas to be discharged after step S1, it is preferable to lengthen the time for step S3 performed after step S1.

Further, this step S3 may be performed by supplying the purge gas while evacuating as long as the gas remaining in the processing container 1 can be removed, or without supplying the purge gas. You may make it continue evacuation in the state which stopped supply. However, by supplying the purge gas, the residual gas in the processing container 1 can be removed in a short time, and the residual gas can be removed in a shorter time by repeating the vacuuming and the purge gas. In addition, 10-100 Pa is illustrated by the pressure in the processing container 1 in this case.

In this manner, by repeatedly supplying the Zr source gas and the oxidizing agent alternately with the step S3 of removing the gas from the processing container 1 in between, a thin film of ZrO ₂ film is repeatedly laminated one by one. It can be a predetermined thickness. The number of repetitions at this time is determined by the film thickness in one cycle and the total film thickness.

Next, an experiment for confirming the effect of the present invention will be described.
Here, TEMAZ is used as the Zr source, O ₃ is used as the oxidant, and the process shown in the timing chart of FIG. 3 and the time schedule of FIG. As shown in the time schedule of FIG. 5 for comparison with the ZrO ₂ film (Example) formed with a film thickness of 12 nm by repeating the cycle, the oxidant supply process of Step S2 is not performed during the process of evacuation. except that went 180sec for ZrO ₂ film formed substantially in the same manner (Comparative example) was measured dielectric properties.

Note that the above examples and comparative examples, the flow rate of the liquid TEMAZ 0.3 or 0.5 mL / min, _{O 3} flow rate of the gas 200g ^/ Nm 3 _{(O 2} gas flow rate = 20 slm), as a purge gas The flow rate of N ₂ gas was 1000 mL / min (sccm).

  The result is shown in FIG. FIG. 6 is a diagram showing a relationship between capacitance (linear scale) on the horizontal axis and leakage current value (Log scale) on the vertical axis. As shown in this figure, it was confirmed that the leakage current characteristics of the example were improved by about 100% compared to the comparative example. From this, it was confirmed that by adopting the present invention, an oxide film having a sufficiently oxidized film quality can be obtained.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above-described embodiment, the present invention is applied to a batch-type film forming apparatus in which a plurality of wafers are mounted and film formation is performed collectively. The present invention can also be applied to a single-wafer type film forming apparatus for forming a film.

In the above embodiment, the ZrO ₂ film is formed as an example. However, a HfO ₂ film that is a similar dielectric film may be used, and a TiO ₂ film, a Ta ₂ O ₅ film, a RuO film, The present invention can also be applied to other oxide films such as a SiO ₂ film. Furthermore, in the above example, an organometallic compound is used as the metal source, but the present invention is not limited to this and may be an inorganic compound. However, it is more effective when an organometallic compound that generates a large amount of gas is used as the metal source.

Furthermore, the object to be processed is not limited to a semiconductor wafer, and the present invention can be applied to other substrates such as an LCD glass substrate.
It can be widely used for applications such as an insulating film between the gate and the gate.

The longitudinal cross-sectional view which shows an example of the film-forming apparatus for enforcing the film-forming method of this invention. The cross-sectional view which shows an example of the film-forming apparatus for enforcing the film-forming method of this invention. 3 is a timing chart showing gas supply timing in the film forming method of the present invention. The figure which shows the time schedule of an Example. The figure which shows the time schedule of a comparative example. The figure which shows the relationship between a capacitance and a leakage current value in an Example and a comparative example.

Explanation of symbols

1; Processing vessel 5; Wafer boat (supply means)
14; oxidant supply mechanism 15; Zr source gas supply mechanism 16; purge gas supply mechanism 17; oxidant supply source 19; oxidant dispersion nozzle 24; Zr source gas dispersion nozzle 40; heating mechanism 100; (Processed object)

Claims (12)

Inserting an object to be processed into a vacuum-maintainable processing container, maintaining the inside of the processing container in a vacuum state, supplying a film forming raw material therein, and supplying an oxidizing agent therein A film forming method for forming an oxide film on a substrate by repeating a plurality of times,
The step of supplying the oxidant is characterized in that the supply of the oxidant is repeated a plurality of times with vacuuming interposed therebetween.   The film forming method according to claim 1, further comprising a step of discharging the gas in the processing container between the step of supplying the film forming raw material and the step of supplying the oxidizing agent.   3. The film forming method according to claim 2, wherein the step of discharging the gas repeats evacuation of the processing container and purging with a purge gas a plurality of times.   4. The film forming method according to claim 1, wherein the number of repetitions of supplying the oxidizing agent is 2 to 10 times. 5. The oxidant is at least one selected from radicals of O ₃ gas, H ₂ O gas, O ₂ gas, NO ₂ gas, NO gas, N ₂ O gas, O ₂ gas and H ₂ gas. The film forming method according to claim 1, wherein the film forming method is characterized in that:   The film forming method according to claim 1, wherein the film forming raw material is an organometallic compound. The film forming method according to claim 1, wherein the oxide film is a ZrO ₂ film. A film forming apparatus for forming a metal oxide film on an object to be processed,
A vertical processing container that can be held in a vacuum and has a cylindrical shape;
A holding member that holds the object to be processed in a plurality of stages in the processing container;
A heating device provided on the outer periphery of the processing vessel;
A film forming material supply mechanism for supplying a film forming material into the processing container;
An oxidant supply mechanism for supplying an oxidant into the processing vessel;
A control mechanism for controlling the supply of the film forming raw material and the oxidizing agent,
The control mechanism repeats a step of supplying a film forming raw material therein and a step of supplying an oxidant therein in a state where the inside of the processing container is kept in vacuum, and an oxide film is formed on the substrate. The film forming apparatus is characterized in that, when forming, the step of supplying the oxidant is controlled so that the supply of the oxidant is repeated a plurality of times with vacuuming interposed.   The control mechanism removes the gas remaining in the processing container between the step of supplying the film forming raw material into the processing container and the step of supplying the oxidizing agent into the processing container. The film forming apparatus according to claim 8, wherein the film forming apparatus is controlled to insert a process.   10. The film formation according to claim 9, wherein the control mechanism controls the step of removing the gas to be performed by repeating evacuation in the processing container and purging with a purge gas a plurality of times. apparatus.   11. The film forming apparatus according to claim 8, wherein the control mechanism controls the number of repetitions of supplying the oxidizing agent to be 2 to 10 times. 11.   A storage medium that operates on a computer and stores a program for controlling a film forming apparatus, the program being stored in a computer so that the method according to any one of claims 1 to 7 is performed at the time of execution. A storage medium that controls the film forming apparatus.

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