DEPOSITION METHOD AND DEPOSITION APPARATUS

A deposition method performed using a deposition apparatus is provided. The deposition apparatus includes: a source line configured to supply Ru3(CO)12 contained in a raw material container into a chamber; a CO gas line configured to supply a CO gas into the raw material container; a bypass line connecting the source line and the CO gas line, and forming a line that does not pass through the raw material container; and a first valve connected to the source line. The deposition method includes: opening the first valve to supply Ru3(CO)12 and the CO gas from the raw material container through the source line; and controlling a pressure in the source line such that the pressure in the source line is a predetermined first pressure or more, and closing the first valve to stop supplying of Ru3(CO)12 and the CO gas to the chamber.

TECHNICAL FIELD

The present invention relates to a deposition method and a deposition apparatus.

BACKGROUND ART

For example, PTL 1 discloses that Ru3(CO)12tends to decompose relatively easily and precipitate ruthenium (Ru), and that decomposition of Ru3(CO)12is accelerated when the partial pressure of CO, which is a reactant in the decomposition reaction of Ru3(CO)12, is low. It is proposed that the decomposition reaction of Ru3(CO)12is suppressed by adding CO to the atmosphere in which Ru3(CO)12is transported and controlling the partial pressure thereof.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

The present disclosure provides a technique for reducing particles.

Solution to Problem

One aspect of the present disclosure provides: a deposition method performed using a deposition apparatus. The deposition apparatus includes: a source line configured to supply Ru3(CO)12as a raw material contained in a raw material container into a chamber; a CO gas line configured to supply a CO gas as a carrier gas into the raw material container; a bypass line connecting the source line and the CO gas line, and forming a line that does not pass through the raw material container; and a first valve connected to the source line. The deposition method includes: (a) opening the first valve to supply Ru3(CO)12and the CO gas from the raw material container through the source line, thereby forming a ruthenium film on a substrate in the chamber; and (b) controlling, after completing (a), a pressure in the source line such that the pressure in the source line is a predetermined first pressure or more, and closing the first valve to stop supplying of Ru3(CO)12and the CO gas to the chamber.

Advantageous Effects of Invention

According to one aspect of the present disclosure, particles can be reduced.

DESCRIPTION OF EMBODIMENTS

In the following, embodiments for carrying out the present disclosure will be described with reference to the drawings. In each drawing, the same components are indicated by the same reference numerals and overlapping descriptions may be omitted.

First, a configuration example of a deposition apparatus1according to an embodiment of the present disclosure will be described with reference toFIGS.1and2.FIG.1is a schematic cross-sectional diagram illustrating the deposition apparatus1according to an embodiment at a processing position.FIG.2is a schematic cross-sectional diagram of the deposition apparatus1according to an embodiment at a transfer position, and a diagram illustrating a configuration example of a gas supply.

The deposition apparatus1is a CVD (Chemical Vapor Deposition) apparatus, and is an apparatus for depositing a ruthenium film, for example. For example, a ruthenium film is deposited on a substrate W by supplying a process gas containing a ruthenium-containing gas (a source gas, precursor) such as triruthenium dodecacarbonyl Ru3(CO)12and a carrier gas such as CO.

The deposition apparatus1has a chamber101. The chamber101is a bottomed container having an opening at the top. The inside of the chamber101is made into a vacuum atmosphere during deposition of the film. The chamber101has therein a mount105for mounting a substrate W, an example of which is a wafer, and a gas discharge mechanism103provided in the upper part of the chamber101so as to face the mount105for supplying gas to the surface of the substrate W. The gas discharge mechanism103defines a space in which gas is introduced.

A gas inlet16is provided in the center of the ceiling of the gas discharge mechanism103. The gas inlet16is connected to a gas supply40through a gas line43to introduce the process gas containing the source gas and the carrier gas into the gas discharge mechanism103. In the present embodiment, the source is Ru3(CO)12and the carrier gas is CO gas.

Inside the gas discharge mechanism103, a first plate member10, a second plate member11, and a shower plate12are provided in this order from the top. The first plate member10, the second plate member11, and the shower plate12are all disc-like members, and are provided in the gas discharge mechanism103so as to face the mount105, and be substantially parallel to each other and separated in the horizontal direction. The process gas introduced from the gas inlet16flows to the outer peripheral side of the first plate member10, passes through an opening11ain the center of the second plate member11, and is supplied into a processing chamber101cthrough a plurality of gas holes12aprovided in the shower plate12.

The support member102supports the gas discharge mechanism103. When the support member102blocks the opening at the top of the chamber101, the chamber101is sealed and the processing chamber101cis formed.

The mount105includes a plate105aformed into a flat disc shape using, for example, aluminum nitride, quartz, and the like as a material. Inside the mount105, a heater106is embedded as an example of a heating means for heating the substrate W. The heater106is composed of, for example, a sheet-like resistance heating element. The heater106is supplied with power from a power supply126provided outside the chamber101to generate heat, and heats the mounting surface of the mount105, thereby raising the substrate W to a predetermined process temperature suitable for deposition. The heater106heats the substrate W mounted on the mount105to, for example, 130° C. to 300° C.

The mount105has a support member105bthat extends downward from the center of the lower surface of the mount105and penetrates the bottom of the chamber101. One end of the support member105bis supported by a lifting mechanism110via a lifting plate109.

A temperature control jacket108is provided as a temperature control member at the lower part of the mount105. The temperature control jacket108includes a plate108ahaving approximately the same size as the mount105on its upper portion, and a shaft108bhaving a larger diameter than the support member105bon its lower portion. The temperature control jacket108is formed with a hole108cextending vertically in the center through the plate108aand the shaft108b. The temperature control jacket108houses the support member105bin the hole108c.

In the temperature control jacket108, a refrigerant passage108dis formed inside the plate108a, and two refrigerant lines115aand115bare provided inside the shaft108b. The refrigerant passage108dhas one end connected to the refrigerant line115aand the other end connected to the refrigerant line115b. The refrigerant lines115aand115bare connected to a refrigerant unit115.

The refrigerant unit115is, for example, a chiller unit. The refrigerant unit115supplies refrigerant at a predetermined temperature from the refrigerant line115ato the refrigerant passage108d. The refrigerant supplied to the refrigerant passage108dreturns to the refrigerant unit115through the refrigerant line115b. The temperature control jacket108is capable of temperature control by circulating a refrigerant, such as cooling water, in the refrigerant passage108d.

A heat insulating ring107is disposed, as an insulation member, between the mount105and the temperature control jacket108. The heat insulating ring107is made of, for example, SUS 316, A5052, Ti (titanium), ceramics, or the like and formed into a disk shape.

The shaft108bof the temperature control jacket108penetrates the bottom of the chamber101. The lower end of the temperature control jacket108is supported by the lifting mechanism110via the lifting plate109located below the chamber101. A bellows111is provided between the bottom of the chamber101and the lifting plate109, so that the chamber101is kept airtight even when the lifting plate109moves up and down.

The lifting mechanism110raises and lowers the lifting plate109to control the distance between the shower plate12and the mount105. The side wall of the chamber101is provided with a transfer port101afor carrying in and out the substrate W, and a gate valve118for opening and closing the transfer port101a. InFIG.1, the mount105is at a transfer position where the substrate W is transferred to and from an external transfer mechanism through the transfer port101a. InFIG.2, the mount105is at a processing position where processing of the substrate W is performed.

A lifting pin112supports the substrate W from the lower surface and lifts the substrate W from the mounting surface of the mount105when the substrate W is transferred to and from the external transfer mechanism. The mount105and the temperature control jacket108are formed with a through hole through which a shaft of the lifting pin112is inserted. An abutting member113is disposed below the lifting pin112.

When the mount105is moved to the processing position (seeFIG.2) of the substrate W, the head of the lifting pin112is housed in the mount105, and the substrate W is mounted on the mounting surface of the mount105.

An annular member114is positioned above the mount105. As illustrated inFIG.2, when the mount105is moved to the processing position of the substrate W, the annular member114contacts the outer periphery of the upper surface of the substrate W and presses the substrate W against the mounting surface of the mount105by the self-weight of the annular member114. When the mount105is moved to the transfer position (seeFIG.1) of the substrate W, the annular member114is locked by a locking portion (not illustrated) above the transfer port101a, so that the transfer of the substrate W by the transfer mechanism is not hindered.

A heat transfer gas supply116inFIG.1supplies a heat transfer gas, such as, for example, He gas, between the rear surface of the substrate W mounted on the mount105and the mounting surface of the mount105, through a line116aand flow passages (not illustrated) formed in the temperature control jacket108and in the mount105.

A purge gas supply117passes through a gap formed between a line117a, the support member105bof the mount105, and the hole108cof the temperature control jacket108, to supply a purge gas such as CO gas, between the lower surface of the annular member114and the upper surface of the mount105. That is, the purge gas passed through the gap is supplied between the lower surface of the annular member114and the upper surface of the mount105through a flow passage formed between the mount105and the heat insulating ring107and extending radially outwardly and through a vertical flow passage formed on the outer periphery of the mount105. This prevents the process gas from flowing into the space between the lower surface of the annular member114and the upper surface of the mount105and prevents the formation of a film on the lower surface of the annular member114or the upper surface of the outer periphery of the mount105.

An exhaust section119including a turbomolecular pump (TMP) and a dry pump is connected to the lower side wall of the chamber101through an exhaust pipe101b. The inside of the chamber101is evacuated by the exhaust section119, and the inside of the processing chamber101cis set and maintained at a predetermined vacuum atmosphere. A pressure gauge CM1is provided on the chamber101to measure the pressure in the chamber101(seeFIG.2). The exhaust pipe101band the exhaust section119are located below the mount105.

As illustrated inFIG.2, an exhaust port13is formed outside the mount105in the radial direction for evacuating the processing chamber101c. The mount105is engaged with a covering104on its outer periphery, and the annular member114positioned on the covering104presses the peripheral edge of the substrate W. Thus, the process gas is evacuated radially outwardly by the exhaust port13formed between the upper surface of the annular member114that presses the peripheral edge of the substrate W, and the lower surface of the shower plate12. The exhaust port13is an opening provided between the upper surface of the annular member114and the lower surface of a protrusion provided on the outer periphery of the shower plate12.

The deposition apparatus1may further include a controller120. The controller120may be a computer including a processor, a storage unit such as a memory, an input device, a display device, an input/output interface of signals, and the like. The controller120controls each part of the deposition apparatus1. For example, the controller120controls the operation of the deposition apparatus1by controlling the gas supply40, the heater106, the lifting mechanism110, the refrigerant unit115, the heat transfer gas supply116, the purge gas supply117, the gate valve118, the exhaust section119, and the like.

In the controller120, the operator can use the input device to input commands and the like to manage the deposition apparatus1. The controller120can visualize and display the operation status of the deposition apparatus1using the display device. The storage unit stores control programs and recipe data. The control program is executed by the processor in order to perform the deposition process in the deposition apparatus1. The processor executes control programs and controls each part of the deposition apparatus1according to the recipe data.

Gas Supply

Next, the configuration of the gas supply40will be described with reference toFIG.2.FIG.2is a diagram illustrating a configuration example of the gas supply40provided in the deposition apparatus1according to an embodiment. The gas supply40includes a raw material container41, a CO gas source42, a gas line43, source lines44and45, CO gas lines46and47, a bypass line49, and valves VA, VB, VC, and VD.

The CO gas source42is connected to the CO gas lines46and47. The CO gas source42includes a mass flow controller or a pressure-controlled flow controller, and supplies the CO gas at a predetermined flow rate to the raw material container41through the CO gas lines46and47.

The raw material container41houses Ru3(CO)12as a raw material for the ruthenium film.

The raw material container41includes a heating means such as a heater to heat and vaporize the solid raw material Ru3(CO)12. The raw material container41is connected to the source lines44and45and is connected to the chamber101through the gas line43. The gas line43is part of a source line that supplies the source gas from the raw material container41to the chamber101. Hereinafter, the lines including the gas line43are also referred to as the source lines43to45.

The source gas of Ru3(CO)12vaporized in the raw material container41is transported by the CO gas of the carrier gas to the source lines43to45and supplied onto the substrate W in the chamber101. The deposition apparatus1may further supply a rare gas. The substrate W on the mount105is controlled to a predetermined temperature by the heater106, and the Ru3(CO)12supplied at a predetermined flow rate is thermally decomposed, thereby forming a ruthenium film.

The bypass line49connects the source lines43to45and the CO gas lines46and47to form a line for supplying the CO gas into the chamber101without passing through the raw material container41. The valve VA is connected to the source line45on a position closer to the raw material container41than to a connection position B1between the bypass line49and the source lines43to45. The valve VA is an example of a first valve. The valve VD is connected to the bypass line49. The valve VD is an example of a second valve.

The valve VB is connected to the source line44on a position closer to the chamber101than to the connection position B1between the bypass line49and the source lines43to45. The valve VB is an example of a third valve. The valve VC is connected to the CO gas line46on a position closer to the raw material container41than to a connection position B2of the bypass line49and the CO gas lines46and47.

An infrared monitor48is connected to the source lines44and45between the valve VA and the valve VB to monitor Ru3(CO)12in the source lines44and45. The infrared monitor48detects Ru3(CO)12from the wavelength of Ru3(CO)12by irradiating the source line44with infrared rays from the window48amade of alumina, monitors the amount (flow rate) of Ru3(CO)12, and controls the partial pressure of the CO gas in the source line (hereinafter, referred to as “the partial pressure of CO”) using the amount.

A pressure gauge CM2is provided on the source lines44and45between the valve VA and the valve VB to measure the pressure inside the source lines44and45. In the present embodiment, the pressure gauge CM2is connected to the source line44and the pressure inside the source line44is measured by the pressure gauge CM2.

The amount of ruthenium relative to the CO gas in the source lines44and45is very small. Therefore, the pressure measured by the pressure gauge CM2may be considered to be almost the partial pressure of CO. Accordingly, the controller120can control the partial pressure of CO in the source lines44and45by controlling the pressure inside the source lines44and45measured by the pressure gauge CM2to be the predetermined first pressure or more. The controller120can also monitor the amount of the source gas of Ru3(CO)12in the source lines44and45by the infrared monitor48.

Control of Partial Pressure of CO

Next, control of the partial pressure of CO in the gas supply40will be described. Preferably, Ru3(CO)12is present in a gaseous state in the raw material container41and in the source lines43to45. However, Ru3(CO)12decomposes relatively easily from the left to the right in a reaction formula (1) below, resulting in deposition of ruthenium (Ru) as indicated by the right of the reaction formula.

A low partial pressure of CO accelerates the decomposition of Ru3(CO)12. When the chemical reaction proceeds from the left to the right of the reaction formula (1), fibrous ruthenium is deposited inside the raw material container41and inside the source lines43to45, for example, and is transported through the source lines43to45to the chamber101, and flies onto the substrate W to become a particle.

FIG.3illustrates an example of the measurement results of the pressure in the source lines43to45after the deposition process. InFIG.3, time “0” on the horizontal axis indicates the end of the deposition process of the ruthenium film, and the vertical axis indicates the partial pressure of CO in the source lines43to45. The partial pressure of CO in the source lines43to45is the pressure inside the source lines43to45measured by the pressure gauge CM2.

After the deposition process, the valves VA, VB, and VC as illustrated inFIG.2are closed at the timing indicated by “valve full close”. When the valves VA, VB and VC are closed, the supply of the source gas and the CO gas to the chamber101are stopped.

Even after the supply of the source gas and the CO gas is stopped, the exhaust section119continues evacuating the chamber101so that the inside of the source lines43to45connected to the chamber101is also evacuated, lowering the pressure of CO in the source lines43to45. Comparative Example 1 inFIG.3illustrates the pressure of CO in the source lines43to45when using normal TMP (N-TMP) for the turbomolecular pump of the exhaust section119, and Comparative Example 2 illustrates the pressure of CO when using large TMP (L-TMP) for the turbomolecular pump of the exhaust section119. Because the large TMP has a larger exhaust capacity than the normal TMP, in Comparative Example 2, the reduction in the pressure of CO in the source lines43to45is greater than in Comparative Example 1.

The deposition apparatus1according to the present embodiment controls the partial pressure of CO in the source lines43to45after the deposition process, and prevents a decrease in the partial pressure of CO in the source lines43to45, thereby preventing the decomposition of Ru3(CO)12. This prevents the generation of ruthenium particles which are precipitated by decomposition of Ru3(CO)12.

Conventionally, the partial pressure of CO in the source lines43to45during the deposition process is controlled. In the present embodiment, in addition, the partial pressure of CO in the source lines43to45is controlled even after the deposition process. That is, after the deposition process, a pressure inside the source lines43to45is controlled such that the pressure is the first pressure or more. Specifically, in the present embodiment, the pressure inside the source lines43to45is maintained at the first pressure or more by controlling, after the deposition process, the pressure inside the chamber101to the second predetermined pressure or more. For example, the second pressure is preferably 0.0166 Torr (2.213 Pa). When the control is performed by setting the second pressure to 0.0166 T, the first pressure is set to 0.053 Torr (7.066 Pa). The first pressure may be a pressure equal to or higher than the pressure of the source lines during the deposition process before “valve full close” as illustrated inFIG.3, for example.

By controlling the partial pressure of CO in the source lines43to45, the decomposition of Ru3(CO)12inside the source lines43to45and the decomposition of Ru3(CO)12in the raw material container41are prevented, and the generation of the particles is reduced. In particular, in a case where the opening/closing operation of the valve VA and the valve VB is slower than the opening/closing operation of the valve VC, even when the controller120simultaneously closes the valve VA, the valve VB, and the valve VC at the timing indicated by “valve full close” inFIG.3, the valve VC closes first. Then, the valve VA and the valve VB are closed. Due to this timing shift, the supply of the CO gas into the raw material container41is stopped first, and then the valve VA and the valve VB are closed. In this case, the partial pressure of CO inside the raw material container41and the source lines43to45is further reduced, and the partial pressure of CO inside the raw material container41and the source lines43to45is further reduced before the subsequent deposition process begins. This further accelerates the decomposition of Ru3(CO)12in the raw material container41and the source lines43to45. Therefore, according to the deposition method according to the present embodiment, a technique for preventing the decomposition of Ru3(CO)12in the raw material container41and in the source lines43to45and reducing the particles, is provided.

FIG.4is a diagram illustrating an example of the results of the control of the partial pressure of CO by the deposition method according to the present embodiment. In the deposition method according to the present embodiment, after the deposition process, “control of partial pressure of CO” was performed in which the pressure inside the source lines43to45was maintained at the first pressure or more by controlling the pressure inside the chamber101to the predetermined second pressure or more. In contrast, in Comparative Examples 1 and 2, the control of the partial pressure of CO was not performed. As a result, in Comparative Examples 1 and 2, the decomposition of Ru3(CO)12in the raw material container41and the source lines43and45was accelerated due to the decrease in the partial pressure of CO in the source lines43to45. Particularly, in Comparative Example 2, the partial pressure of CO in the source lines43to45was further reduced because the large TMP having a larger exhaust capacity than the normal TMP of Comparative Example 1 was used. This further accelerated the decomposition of Ru3(CO)12in the raw material container41and the source lines43to45. As a result, the number of particles on the substrate W was up to 74 in Comparative Example 1 and up to 137 in Comparative Example 2, when measuring the number of particles for the plurality of substrates W after the deposition process. In contrast, in the deposition method according to the present embodiment, the number of particles was reduced to43, which was the lowest, by the above-described control of the partial pressure of CO.

Operation of Deposition Apparatus1

Next, an example of operation of the deposition apparatus1will be described with reference toFIGS.5and6.FIG.5is a flow diagram illustrating an example of a deposition method MT1performed by the deposition apparatus1according to the embodiment.FIG.6Ais a diagram for explaining the state of “during process” of the deposition method MT1inFIG.5.FIG.6Bis a diagram for explaining the state of “after process” of the deposition method MT1inFIG.5. The deposition method MT1is controlled by the controller120. At the start, the inside of the chamber101is in a vacuum atmosphere by the exhaust section119. The mount105is moved at a transfer position.

When the method MT1is started, a substrate is prepared (step S1). In step S1, the gate valve118is first opened and the substrate W is placed on the lifting pin112by the external transfer mechanism. When the transfer mechanism exits the transfer port101a, the gate valve118is closed. The lifting mechanism110is controlled such that the mount105is moved to the processing position. At this time, when the mount105is raised, the substrate W mounted on the lifting pin112is mounted on the mounting surface of the mount105. Further, the annular member114contacts the outer periphery of the upper surface of the substrate W and presses the substrate W to the mounting surface of the mount105by the own weight of the annular member114. Accordingly, a process space is formed in the processing chamber101cabove the mount105.

The controller120operates the heater106and controls the gas supply40such that the valve VA, the valve VB, and the valve VC are opened, and the valve VD is closed (step S2). Thus, the CO gas is supplied from the CO gas source42through the CO gas line47into the raw material container41. Ru3(CO)12in the raw material container41is heated and vaporized, and supplied into the chamber101through the source lines43to45using the CO gas as a carrier gas (step S3). In step S4, a ruthenium film is formed on the substrate W by Ru3(CO)12and the CO gas supplied into the processing chamber101c. After the processing, the gases pass through the exhaust port13on the upper side of the annular member114from the processing chamber101c, and are exhausted through the exhaust pipe101bby the exhaust section119.

Next, in step S5, it is determined whether or not the deposition process is completed. When it is determined that the deposition process is not completed, the process returns to step S3, and the deposition process of steps S3to S5continues. In contrast, when it is determined that the deposition process is completed, the source lines43to45are maintained at the first pressure or more by controlling the pressure inside the chamber101to the predetermined second pressure or more (step S6).

Next, the amount of Ru3(CO)12in the source lines44and45is monitored using the infrared monitor48(step S7). Based on the monitoring result, the partial pressure of CO inside the source lines43to45is controlled.

Next, the valve VA, the valve VB, and the valve VC are closed (step S8) in a state where the source lines43to45are maintained at the first pressure or more. Thus, the supply of the source gas of Ru3(CO)12and the CO gas into the processing chamber101cis stopped. At this time, the partial pressure of CO inside the source lines43to45is controlled so that the decomposition of Ru3(CO)12is prevented. This prevents the decomposition of Ru3(CO)12in the source lines43to45and in the raw material container41, and reduces the particles.

Next, the valve VB and the valve VD are opened, and the CO gas is supplied into the chamber101through the CO gas line47, the bypass line49, and the source lines43to45(step S9). By supplying the CO gas into the chamber101, residual CO gas after the deposition process can be exhausted from the inside of the source lines43to45, for each deposition process of each substrate W.

As described above, the deposition method MT1according to the present embodiment has been described. According to the method, the valve VA, the valve VB, and the valve VC are opened, and the valve VD is closed during the deposition process, as illustrated inFIG.6A(FIG.5: S2).

After the deposition process is completed, as illustrated inFIG.6B, the pressure in the source lines43to45are maintained at the first pressure or more by setting the pressure inside the chamber101to the second pressure or more (FIG.5: S6), before closing the valve VA, the valve VB, and the valve VC (FIG.5: S8). This prevents the decomposition of Ru3(CO)12in the source lines43to45and in the raw material container41, and reduces the particles.

After the processing in steps S6to S9is performed, the substrate W is carried out from the chamber101. When the substrate W is carried out, the lifting mechanism110is controlled such that the mount105is moved to a receiving position. When the lower end of the lifting pin112abuts against the abutting member113, the head of the lifting pin112protrudes from the mounting surface of the mount105and lifts the substrate W from the mounting surface of the mount105.

Next, the gate valve118is opened and the substrate W mounted on the lifting pin112is carried out by the external transfer mechanism. When the transfer mechanism exits the transfer port101a, the gate valve118is closed.

Other Operation of Deposition Apparatus1

Next, another operation of the deposition apparatus1will be described with reference toFIGS.7and8.FIG.7is a flow diagram illustrating an example of a deposition method MT2performed by the deposition apparatus1according to an embodiment.FIG.8Ais a diagram for explaining the state of “during process” of the deposition method MT2inFIG.5.FIG.8Bis a diagram for explaining the state of “after process” of the method MT2inFIG.5. The deposition method MT2is controlled by the controller120. The deposition method MT2ofFIG.7may be performed after executing the deposition method MT1ofFIG.5. The deposition method MT2can be performed while the deposition process is not being performed.

When the method MT2is started, the gas supply40is controlled such that the valve VA, the valve VB, and the valve VC are closed and the valve VD is opened, as illustrated inFIG.8A(step S11). Thus, the CO gas is supplied to the source lines44and45between the valve VA and the valve VB from the CO gas source42through the CO gas line47and the bypass line49(step S12).

After the CO gas is supplied to the source lines44and45, as illustrated inFIG.8B, the valve VD is closed, and the CO gas is contained inside the source lines44and45(step S13). Accordingly, the CO gas is injected into the source lines44and45, thereby preventing the decomposition of Ru3(CO)12inside the source lines44and45, and reducing the particles.

The inside of the source lines43to45is evacuated after the deposition process of each substrate W to prevent Ru3(CO)12from being left in the source lines43to45. However, it takes a considerable amount of time to sufficiently evacuate the source lines43to45, which reduces the throughput. To cope with this, by performing the deposition method MT2between the deposition processes, the CO gas is contained inside the source lines44and45, and the partial pressure of CO is increased. This prevents the decomposition of Ru3(CO)12inside the source lines44and45, and reduces the particles.

The deposition method and the deposition apparatus according to the embodiments disclosed herein should be considered as examples in all respects and not restrictive. Embodiments can be modified and improved in various ways without departing from the appended claims and spirit thereof. The items described in the above embodiments may take other configurations within a range that is not inconsistent, and may be combined within a range that is not inconsistent.

For example, the deposition apparatus of the present disclosure may be an atomic layer deposition (ALD) device, a plasma ALD device, a thermal CVD device, a plasma CVD device, and the like.

The present application claims priority to Japanese Patent Application No. 2020-114371, filed Jul. 1, 2020, with the Japanese Patent Office, the contents of which are incorporated herein by reference in their entirety.

DESCRIPTION OF THE REFERENCE NUMERAL

41Raw Material Container

42CO Gas Source

46,47CO Gas Line

W Substrate