The present disclosure relates to a substrate processing apparatus and a substrate processing method. The substrate processing apparatus according to the exemplary embodiment of the present disclosure may include: a processing liquid supply tube; a nozzle unit which is supplied with a processing liquid from the processing liquid supply tube and discharges the processing liquid to the substrate; and a light source unit which is provided to irradiate the processing liquid discharged from the nozzle unit with ultraviolet rays. According to the present disclosure, the processing liquid, which is electrified while passing the processing liquid supply tube, is irradiated with ultraviolet rays, such that electricity is eliminated from the electrified processing liquid, and as a result, it is possible to minimize a problem that the substrate is contaminated by peripheral particles or arcing occurs on the substrate.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2017-0098782, filed on Aug. 4, 2017 in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

The present disclosure relates to a substrate processing apparatus and a substrate processing method which performs liquid processing on a substrate.

BACKGROUND

In a process of manufacturing a semiconductor or a display, an apparatus is used which performs liquid processing on a substrate to be processed, such as a semiconductor wafer or a glass substrate, by supplying a processing liquid onto the substrate. Examples of this apparatus include a cleaning device that removes particles or contaminants attached to a surface of the substrate.

The cleaning device includes a nozzle for supplying the processing liquid onto the substrate, the nozzle is connected to a processing liquid storage tank through a processing liquid supply tube, and the processing liquid storage tank stores the processing liquid. Typically, the processing liquid supply tube is made of an insulating material such as perfluoroalkoxy (PFA).

Meanwhile, the processing liquid is electrified while the processing liquid flows in the processing liquid supply tube. For example, when deionized water flows in the PFA tube, the PFA tube is negatively electrified, and the deionized water is positively electrified.

When the electrified processing liquid is supplied onto the surface of the substrate, electrically charged particles existing at the periphery of the substrate are moved to the surface of the substrate by attractive force, which causes a problem that the substrate is contaminated by the electrically charged particles or arcing occurs due to static electricity.

SUMMARY

The present disclosure has been made in an effort to provide a substrate processing apparatus and a substrate processing method which are capable of eliminating electricity from the electrified processing liquid.

The present disclosure has also been made in an effort to provide a substrate processing apparatus and a substrate processing method which are capable of minimizing a problem that a substrate is contaminated by particles existing at the periphery of the substrate or arcing occurs on the substrate due to an electrified processing liquid.

An exemplary embodiment of the present disclosure provides a substrate processing apparatus including: a processing liquid supply tube; a nozzle unit which is supplied with a processing liquid from the processing liquid supply tube and discharges the processing liquid to the substrate; and a light source unit which is provided to irradiate the processing liquid discharged from the nozzle unit with ultraviolet rays.

The light source unit may have an ultraviolet ray emission range in which the ultraviolet rays are emitted to the processing liquid supplied onto an upper surface of the substrate, or the light source unit may have an ultraviolet ray emission range in which the ultraviolet rays are emitted to the processing liquid before the processing liquid discharged from the nozzle unit reaches the substrate. Alternatively, the light source unit may have an ultraviolet ray emission range in which the ultraviolet rays are emitted to both of the processing liquid before the processing liquid discharged from the nozzle unit reaches the substrate and the processing liquid supplied onto the upper surface of substrate.

The light source unit may include a housing, and an ultraviolet lamp which is installed in the housing and emits the ultraviolet rays, a reflective surface for reflecting the ultraviolet rays may be installed in the housing, and a range in which the ultraviolet rays are emitted from the light source unit may be determined by the reflective surface. In this state, the multiple reflective surfaces having different angles may be provided and configured to have emission angles of light that vary depending on directions.

In addition, the substrate processing apparatus may include a drive unit which moves the nozzle unit from a standby position to a process position, in which the light source unit may be configured to be moved by the drive unit or moved by a separate drive unit provided separately from the drive unit.

The light source unit may include: an ultraviolet lamp which emits ultraviolet rays; a light guide unit which is connected to the ultraviolet lamp and transmits the ultraviolet rays; and a light irradiation unit which irradiates the processing liquid with the ultraviolet rays transmitted through the light guide unit. Here, the multiple light guide units may be provided, and the multiple light guide units may be connected to the single ultraviolet lamp.

The substrate processing apparatus may further include: an emission range adjusting unit which adjusts an emission range of the ultraviolet rays emitted from the light source unit, in which the emission range adjusting unit may be a rotating shaft.

The ultraviolet ray may have a wavelength range of ultraviolet ray C.

The processing liquid supply tube may be made of an insulating material, and the processing liquid may be positively electrified while passing through the processing liquid supply tube.

Another exemplary embodiment of the present disclosure provides a substrate processing apparatus which performs a liquid processing process by supplying a processing liquid onto a substrate, the substrate processing apparatus including: a processing liquid storage unit; a nozzle unit which discharges the processing liquid to the substrate; a processing liquid supply tube which delivers the processing liquid from the processing liquid storage unit to the nozzle unit; a processing liquid supply valve which is installed in the processing liquid supply tube and operates to open or close; a light source unit which includes an ultraviolet lamp that emits ultraviolet rays to the processing liquid discharged from the nozzle unit; a switch which turns on or off the ultraviolet lamp; and a control unit which controls an operation of opening and closing the processing liquid supply valve and an operation of turning on and off the ultraviolet lamp, in which the control unit controls the operation of opening and closing the processing liquid supply valve in conjunction with the operation of turning on and off the ultraviolet lamp.

The control unit may operate the switch so that the ultraviolet lamp is turned on when a predetermined delay time has elapsed after opening the processing liquid supply valve.

Still another exemplary embodiment of the present disclosure provides a substrate processing method using the substrate processing apparatus, the substrate processing method including: opening the processing liquid supply valve; and turning on the ultraviolet lamp when a predetermined delay time has elapsed after the opening of the processing liquid supply valve.

The predetermined delay time may be set to the amount of time equal to or larger than the amount of time it takes for the processing liquid discharged from the nozzle unit to be supplied onto an upper surface of the substrate after the processing liquid supply valve is opened.

Alternatively, the predetermined delay time may be set to the amount of time equal to or smaller than the amount of time it takes until the processing liquid begins to be discharged from the nozzle unit after the processing liquid supply valve is opened.

According to the exemplary embodiment of the present disclosure, the processing liquid, which is electrified while passing through the processing liquid supply tube, is irradiated with ultraviolet rays, such that electricity may be eliminated from the electrified processing liquid.

In addition, according to the exemplary embodiment of the present disclosure, it is possible to minimize a problem that because the electrified processing liquid is supplied, the substrate is contaminated by peripheral particles or arcing occurs on the substrate.

DESCRIPTION OF EMBODIMENT

Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. The following description includes specific exemplary embodiments, but the present disclosure is not limited or restricted by the described exemplary embodiments. In the description of the present disclosure, the specific descriptions of publicly known related technologies will be omitted when it is determined that the specific descriptions may obscure the subject matter of the present disclosure.

FIG. 1is a cross-sectional view of a substrate processing apparatus according to an exemplary embodiment of the present disclosure. The present disclosure will be described with reference toFIG. 1illustrating a cleaning device as an example of the substrate processing apparatus according to the present disclosure, but the substrate processing apparatus according to the present disclosure is not limited to the cleaning device.

Referring toFIG. 1, a substrate processing apparatus1includes a chamber10, a cup unit20, a support unit40, a lifting unit60, a processing liquid supply unit80, and a light source unit100.

The chamber10defines an internal space in which a liquid processing process is performed on a substrate W. The liquid processing process may be performed at a normal pressure or under a vacuum, such that a vacuum pump (not illustrated) for forming a vacuum may be connected to the chamber10.

The cup unit20is positioned in a space in the chamber10, and the cup unit20may include a first cup member22, a second cup member24, and a third cup member26. The cup unit20serves to define a substrate processing space and recover a used processing liquid, and each of the cup members22,24, and26may have an annular shape, in a plan view, that surrounds the substrate W. In this case, the first cup member22may be provided at an innermost side, the second cup member24may be provided to surround the first cup member22, and the third cup member26may be provided at an outermost side to surround the second cup member26. First to third openings22a,24a, and26a, which are formed by the cup members22,24, and26, respectively, serve as inlet ports for recovering the processing liquids radially discharged from the rotating substrate W, and the first to third openings22a,24a, and26amay be used to recover the different processing liquids. Recovery tubes22b,24b, and26b, which extend downward, are connected to bottom surfaces of the cup members22,24, and26, respectively. The respective recovery tubes22b,24b, and26bdischarge the processing liquid introduced through the respective openings22a,24a, and26a. The discharged processing liquids may be reused after being regenerated by an external processing liquid regenerating device (not illustrated).

The support unit40supports the substrate and rotates the substrate while the process is in progress. The support unit40includes a spin head42, support pins44, chuck pins46, a driving shaft48, and a support unit drive unit49. The spin head42has an upper surface having an approximately circular shape when viewed from the top side. The driving shaft48, which is rotatable by the support unit drive unit49, is coupled to a bottom surface of the spin head42. When the driving shaft48rotates, the spin head42rotates, and thus the substrate W is rotated together with the spin head42. The spin head42includes the support pin44and the chuck pin46to support the substrate. The multiple support pins44protrude from the upper surface of the spin head42and serve to support a rear surface of the substrate W. The multiple chuck pins46are positioned farther from a center of the spin head42than are the support pins44. The chuck pins46are provided to support a lateral surface of the substrate W to prevent the substrate W from deviating from an exact position when the spin head42and the substrate W rotate. The chuck pins46may be configured to be movable rectilinearly in a radial direction of the spin head42between a standby position and a support position. The standby position is a position that is farther from the center of the spin head42than is the support position. The chuck pins46are positioned at the standby position when the substrate is loaded onto or unloaded from the support unit40, and the chuck pins46are positioned at the support position when the process is performed on the substrate. At the support position, the chuck pins46are in contact with a lateral portion of the substrate.

The lifting unit60may be configured to move the cup unit20upward or downward. The lifting unit60may be configured to simultaneously or individually move the respective cup members22,24, and26of the cup unit20. A relative height of the cup unit20to the support unit40is changed as the cup unit20is moved upward or downward. The lifting unit60has a bracket62, a lifting shaft64, and a lifting drive unit66. The bracket62is fixedly installed on an outer wall of the cup unit20, and the lifting shaft64, which is moved vertically by the lifting drive unit66, is fixedly coupled to the bracket62. The cup unit20may be moved downward to prevent the cup unit20from interfering with a substrate conveying robot (not illustrated) while the substrate W is placed on the support unit40or moved upward from the support unit40. In addition, when the substrate processing process is in progress, the height of the cup unit20may be adjusted such that the processing liquids may be introduced into the predetermined openings22a,24a, and26a, respectively, in accordance with the types of processing liquids supplied onto the substrate W. Alternatively, the spin head42may be configured to move vertically instead of the cup unit20.

The processing liquid supply unit80serves to supply the processing liquid onto the substrate W and may include a nozzle arm82, a nozzle unit84, a support86, and a drive unit88. The support86is disposed vertically, and the drive unit88is coupled to a lower end of the support86. The drive unit88may rotate and/or move the support86upward or downward. The nozzle arm82may be coupled to an upper end of the support86and may extend horizontally. The nozzle unit84is installed on a bottom surface at an end of the nozzle arm82and discharges the processing liquid to the substrate. The nozzle unit84is moved between a process position and a standby position by the drive unit88. The process position is a position at which the nozzle unit84is disposed vertically above the cup unit20to supply the processing liquid onto an upper surface of the substrate W. The standby position is a position at which the nozzle unit84deviates from the position vertically above the cup unit20. As the drive unit88rotates the support86, the nozzle unit84and the nozzle arm82coupled to the support86may be rotated between the process position and the standby position. One or multiple processing liquid supply units80may be provided. In a case in which the multiple processing liquid supply units80are provided, the respective processing liquid supply units80may supply different processing liquids.

The processing liquid may include a cleaning solution such as sulfuric acid or phosphoric acid or a rinsing liquid such as deionized water. The processing liquid flows to the nozzle unit84from a processing liquid storage unit (not illustrated) through a processing liquid supply tube90, and the processing liquid supply tube90may be inserted into the nozzle arm82. The processing liquid supply tube90may be made of an insulating material, or the processing liquid supply tube90may be a perfluoroalkoxy (PFA) tube.

The light source unit100is provided to emit ultraviolet rays UV to a processing liquid F which is discharged from the nozzle unit84and supplied onto the substrate W. The ultraviolet ray emitted by the light source unit100may be ultraviolet ray C having a wavelength of about 280 nm or less.

A configuration and an effect of the light source unit100according to the exemplary embodiment of the present disclosure will be described in detail with reference toFIGS. 2 and 3.

The light source unit100includes an ultraviolet lamp120that emits ultraviolet rays UV, and the light source unit100may have a housing110in which the ultraviolet lamp120is disposed. Reflective surfaces110amay be formed in the housing110to limit an emission angle of light from the light source unit100to a predetermined direction and a predetermined range.

FIG. 2is a view illustrating a state in which the liquid processing process is performed on the substrate W in a state in which the light source unit100is not operated and no ultraviolet ray UV is emitted. When the processing liquid F is discharged from the nozzle unit84onto the upper surface of the rotating substrate W, a film of the processing liquid F is formed on the upper surface of the substrate as illustrated in the drawing. In this case, the processing liquid F is electrified while passing through the processing liquid supply tube90, and thus the liquid film in an electrified state is also formed on the upper surface of the substrate. In a case in which the processing liquid supply tube90is made of a substance such as a substance that is easily negatively electrified like the PFA tube, the processing liquid F is positively electrified, and thus the processing liquid F attracts particles P negatively electrified among particles at the periphery of the substrate W. The particles may act as a source of contamination to the substrate W. Further, arcing may occur on the substrate W due to the electrified processing liquid F, which may cause damage to the surface of the substrate. In a case in which fine patterns are formed on the surface of the substrate, the particles or the arcing may cause a serious problem in terms of performance or yield.

In contrast, when the light source unit100operates as illustrated inFIG. 3, the ultraviolet rays UV emitted from the light source unit100may eliminate electricity from the processing liquid F. Various principles using ultraviolet rays to eliminate electricity may be applied, and for example, electricity may be eliminated as photoelectrons or other negative (−) ions, which are created by the ultraviolet ray, bind to positive (+) charges on the processing liquid F. The ultraviolet rays with high energy are required to create the photoelectrons and the like, and thus the light source unit100may include the ultraviolet lamp120that emits the ultraviolet ray C having a wavelength of about 280 nm or less.

Meanwhile, an emission range of the ultraviolet ray may be limited to a range in which the processing liquid is supplied onto the substrate W so that constituent components of the substrate processing apparatus1are not damaged by the emitted ultraviolet rays with high energy. To this end, the reflective surfaces110amay be provided to surround the ultraviolet lamp120, such that the ultraviolet rays emitted from the ultraviolet lamp120travel only in a direction toward the substrate W. In a case in which the light source unit100is configured such that the ultraviolet rays UV approximately cover a radial range from a center to an edge of the substrate as illustrated inFIG. 3, the entire processing liquid F supplied onto the upper surface of the substrate W may be irradiated with the ultraviolet rays UV since the substrate W rotates during the liquid processing process.

In the exemplary embodiment illustrated inFIGS. 2 and 3, the light source unit100is installed at a predetermined position of the processing liquid supply unit80, particularly, on the nozzle arm82, such that the light source unit100may be moved between the process position and the standby position without using a separate driving source. That is, when the drive unit88rotates the support86and the nozzle unit84is moved to the process position to perform the liquid processing process, the light source unit100coupled to the nozzle arm82may also be moved to the process position.

In the case in which the multiple processing liquid supply units80are provided, the multiple light source units100may also be provided and installed on the multiple processing liquid supply units80, respectively.

FIG. 4is a view for explaining a light source unit100according to another exemplary embodiment of the present disclosure. Referring toFIG. 4, the light source unit100is provided to emit the ultraviolet rays UV to the processing liquid being discharged from the nozzle unit84. Specifically, the light source unit100includes an ultraviolet lamp120that emits ultraviolet rays UV, and the light source unit100may have a housing110in which the ultraviolet lamp120is disposed. Reflective surfaces110aare provided in the housing110to adjust an emission angle of light from the light source unit100so that the ultraviolet rays UV may be emitted to the processing liquid before the processing liquid discharged from the nozzle unit84is supplied onto the substrate W.

In the exemplary embodiment illustrated inFIG. 4, before the processing liquid discharged from the nozzle unit84is supplied onto the substrate W, it is possible to eliminate electricity from the processing liquid which is electrified while passing through the processing liquid supply tube90. For this reason, it is possible to prevent a problem that the substrate W is contaminated by peripheral particles due to the supply of the electrified processing liquid, and it is possible to minimize arcing that may occur at a point in time at which the electrified processing liquid is supplied onto the substrate W. In addition, it is possible to minimize damage to the substrate or fine patterns that may be caused when the substrate W is irradiated with the ultraviolet rays UV with high energy, and it is possible to minimize oxidation of the surface of the substrate caused by ozone (O3) created by the ultraviolet rays UV.

In the case of the exemplary embodiment illustrated inFIG. 4, the light source unit100may not be configured such that the ultraviolet rays UV cover approximately a radial range from the center to the edge of the substrate, as long as the processing liquid being discharged from the nozzle unit84is irradiated with the ultraviolet rays UV. Therefore, the light source unit100may have a relatively small size.

Even in the substrate processing apparatus1according to the exemplary embodiment illustrated inFIG. 4, the light source unit100is installed at a predetermined position of the processing liquid supply unit80, particularly, on the nozzle arm82, such that the light source unit100may be moved between the process position and the standby position without using a separate driving source. Further, in the case in which the multiple processing liquid supply units80are provided, the multiple light source units100may also be provided and installed on the multiple processing liquid supply units80, respectively.

FIG. 5is a view for explaining a light source unit100according to still another exemplary embodiment of the present disclosure. Referring toFIG. 5, a light source unit100is configured such that both of the processing liquid F being discharged from the nozzle unit84and the processing liquid F supplied onto the substrate W are irradiated with the ultraviolet rays UV. Specifically, the light source unit100includes an ultraviolet lamp120that emits ultraviolet rays UV, and the light source unit100may have a housing110in which the ultraviolet lamp120is disposed. Multiple reflective surfaces110aand110bhaving different angles may be provided in the housing110such that the ultraviolet rays UV emitted from the light source unit100may cover approximately a range from a lower end portion of the nozzle unit84to the edge of the substrate. That is, the light source unit100may be configured to have emission angles of light that vary depending on directions. With this configuration, the ultraviolet rays UV may be emitted toward not only the processing liquid F which is discharged from the nozzle unit84but not yet supplied onto the substrate W, but also the entire processing liquid F supplied onto the upper surface of the substrate W in a rotating state.

According to the exemplary embodiment illustrated inFIG. 5, before the processing liquid discharged from the nozzle unit84is supplied onto the substrate W, it is possible to eliminate electricity from the processing liquid which is electrified while passing through the processing liquid supply tube90. For this reason, it is possible to prevent a problem that the substrate W is contaminated by peripheral particles due to the supply of the electrified processing liquid, and it is possible to minimize arcing that may occur at a point in time at which the electrified processing liquid is supplied onto the substrate W. Further, the processing liquid F supplied onto the substrate W is also irradiated with the ultraviolet rays UV, and as a result, it is possible to further improve the effect of eliminating electricity.

Even in the substrate processing apparatus1according to the exemplary embodiment illustrated inFIG. 5, the light source unit100is installed at a predetermined position of the processing liquid supply unit80, particularly, on the nozzle arm82, such that the light source unit100may be moved between the process position and the standby position without using a separate driving source. Further, in the case in which the multiple processing liquid supply units80are provided, the multiple light source units100may also be provided and installed on the multiple processing liquid supply units80, respectively.

FIG. 6is a view for explaining a light source unit100according to yet another exemplary embodiment of the present disclosure. The exemplary embodiment illustrated inFIG. 6differs from the exemplary embodiments illustrated inFIGS. 2 to 5in that a light source unit100is not installed on the processing liquid supply unit80, but the light source unit100is provided separately.

Specifically, the light source unit100may include an ultraviolet lamp120that emits ultraviolet rays UV, a housing110in which the ultraviolet lamp120is disposed, and a support arm130on which the housing110is installed. The support arm130is configured separately from the nozzle arm82of the processing liquid supply unit80, such that the nozzle arm82and the nozzle unit84are operated by the drive unit88of the processing liquid supply unit80independently of the operation of the light source unit100.

The support arm130may be fixedly installed at a predetermined position in the chamber10, or the support arm130may be configured to be operated from a standby position to an ultraviolet ray emission position by a separate support arm drive unit (not illustrated). In the case in which the support arm drive unit (not illustrated) is provided, the light source unit100is moved between the ultraviolet ray emission position and the standby position by the support arm drive unit (not illustrated). The ultraviolet ray emission position may be, for example, a position vertically above the cup unit20so that the light source unit100may emit the ultraviolet rays UV within a predetermined emission range. The standby position may be a position at which the light source unit100deviates from the position vertically above the cup unit20.

According to the exemplary embodiment illustrated inFIG. 6, only one light source unit100may be provided even in the case in which the multiple processing liquid supply units80are provided. In addition, it may be relatively easy to perform maintenance on the light source unit100.

FIG. 6illustrates that reflective surfaces110aare formed in the housing110so that the ultraviolet rays UV emitted from the light source unit100cover approximately the range from the center to the edge of the substrate W, but this configuration is illustrative. In the state in which the light source unit100is provided separately, as illustrated inFIG. 6, instead of being installed on the processing liquid supply unit80, the light source unit100may be configured such that the ultraviolet rays UV are emitted to the processing liquid before the processing liquid discharged from the nozzle unit84is supplied onto the substrate W as illustrated inFIG. 4, or the light source unit100may be configured such that the ultraviolet rays UV are emitted to both of the processing liquid F being discharged from the nozzle unit84and the processing liquid F supplied onto the substrate W as illustrated inFIG. 5.

FIG. 7is a view for explaining a light source unit100according to still yet another exemplary embodiment of the present disclosure. The exemplary embodiment illustrated inFIG. 7differs from the previous exemplary embodiments in that an emission range adjusting unit140is provided to adjust an emission range of the ultraviolet rays UV from the light source unit100.

Referring toFIG. 7which is an illustrative drawing, the light source unit100may include an ultraviolet lamp120that emits ultraviolet rays UV, a housing110in which the ultraviolet lamp120is disposed, and a support arm130on which the housing110is installed. In this case, the housing110is installed to be rotatable about a rotating shaft140relative to the support arm130. Although not illustrated, a fixing member (not illustrated) may be provided to fix the housing110to maintain the housing110in a state in which the housing110is rotated to a predetermined angle.

According to the exemplary embodiment illustrated inFIG. 7, the emission range of the ultraviolet rays UV may be optionally changed and applied in consideration of an electrified state of the processing liquid F, the type of substrate W, a structure of the substrate processing apparatus1, components in the chamber10, a wavelength of the ultraviolet ray UV, and the like. For example, as illustrated inFIG. 7, the ultraviolet rays UV may be emitted approximately in the radial range from the center to the edge of the substrate W, and the emission range of the ultraviolet rays UV may be adjusted by rotating the housing110by a predetermined angle about the rotating shaft140so that the processing liquid F being discharged from the nozzle unit84is irradiated with the ultraviolet rays UV.

FIG. 7illustrates the rotating shaft140as an emission range adjusting unit, but this configuration is illustrative. Although not illustrated, the emission range adjusting unit may be a movement means for moving the housing110in x, y, and z directions.

The emission range adjusting unit140may also be applied to the exemplary embodiments illustrated inFIGS. 2 to 5. That is, the housing110may be installed to be rotatable at a predetermined angle relative to the nozzle arm82or may be installed to be movable in the x, y, and z directions relative to the nozzle arm82. With this configuration, it is possible to precisely adjust or change the emission range of the ultraviolet rays UV.

FIG. 8is a view for explaining a light source200according to further another exemplary embodiment of the present disclosure. The exemplary embodiment illustrated inFIG. 8differs from the previous exemplary embodiments in that ultraviolet rays generated from a remotely disposed ultraviolet lamp (not illustrated) are emitted to the processing liquid F through a light guide unit220and a light irradiation unit210.

Specifically, the light source unit100includes the ultraviolet lamp (not illustrated) which generates the ultraviolet rays UV, the light guide unit220which connects the ultraviolet lamp and the light irradiation unit210, and the light irradiation unit210which irradiates the processing liquid F with the ultraviolet rays transmitted through the light guide unit220. The light guide unit220and the light irradiation unit210may be installed on the support arm230.

In the exemplary embodiment illustrated inFIG. 8, the ultraviolet lamp (not illustrated) may be remotely disposed, for example, at a position outside the chamber, and as a result, it is easy to replace or repair the ultraviolet lamp. In addition, the light irradiation unit210may be designed regardless of a shape or a size of the ultraviolet lamp, and as a result, it is possible to more freely adjust the emission range of the ultraviolet rays UV.

The support arm230may be configured separately from the nozzle arm82of the processing liquid supply unit80as illustrated inFIG. 8, or the support arm230may have the same configuration as the nozzle arm82. That is, the light guide unit220and the light irradiation unit210may be installed on the nozzle arm82without the support arm230. In the case in which the multiple processing liquid supply units80are provided and the light guide units220and the light irradiation units210are installed on the nozzle arms82, the light guide unit220and the light irradiation unit210may be installed on each of the nozzle arms82. In this case, only a single ultraviolet lamp (not illustrated) may be remotely disposed, and multiple light guide units220may be connected to the single ultraviolet lamp.

Hereinafter, a substrate processing method according to another exemplary embodiment of the present disclosure will be described with reference toFIGS. 9 and 10.

Referring toFIG. 9, the nozzle unit84is connected to the processing liquid storage unit through the processing liquid supply tube90. A processing liquid supply valve92is provided in the processing liquid supply tube90, and the processing liquid supply valve92is opened or closed by a control unit. The control unit is also connected to a switch122so as to control the switch122that turns on or off the ultraviolet lamp of the light source unit100.

t1to t5illustrated inFIG. 9indicates time. t1refers to the time when the processing liquid supply valve92is opened by a valve opening control signal from the control unit, and t2refers to the time when the processing liquid F begins to be discharged from the nozzle unit84as the processing liquid supply valve92is opened. t3refers to the time when the processing liquid F discharged from the nozzle unit84is supplied onto the upper surface of the substrate W, and t4refers to the time when the supplied processing liquid reaches the edge of the substrate as the substrate rotates. Further, t5refers to the time when the ultraviolet lamp is turned on under control of the control unit.

Referring toFIG. 10, the substrate processing method according to the present disclosure includes opening the processing liquid supply valve92(S1), and turning on the ultraviolet lamp when a predetermined time Δt has elapsed (S2). Here, the predetermined time Δt may be adjusted depending on exemplary embodiments.

For example, in a case in which the processing liquid F supplied onto the substrate W is intended to be irradiated with the ultraviolet rays UV, like the exemplary embodiment illustrated inFIG. 3, the predetermined time Δt may be set to (t3-t1) or more, particularly, (t4-t1) or more. As described above, the ultraviolet lamp is not turned on immediately after the processing liquid supply valve92is opened, but the ultraviolet lamp is turned on when the predetermined time has elapsed after opening the processing liquid supply valve92, and as a result, it is possible to control the ultraviolet lamp to prevent the substrate W, onto which no processing liquid F is supplied, from being irradiated with the ultraviolet rays UV with high energy.

In addition, like the exemplary embodiment illustrated inFIG. 4, to eliminate electricity before the processing liquid F is supplied onto the upper surface of the substrate W, the predetermined time Δt may be set to (t3-t1) or less, particularly, (t2-t1) or less. Since the predetermined time is set as described above, the processing liquid F, which is electrified while passing through the processing liquid supply tube90, may be controlled to be exposed to the ultraviolet rays UV before the processing liquid F is supplied onto the upper surface of the substrate W.

The predetermined delay time Δt described above is illustrative and may be variously adjusted depending on exemplary embodiments. That is, the substrate processing method according to the present disclosure is characterized by controlling the operation of opening and closing the processing liquid supply valve92in conjunction with the operation of turning on and off the ultraviolet lamp.

Hereinafter, an effect of eliminating electricity from the processing liquid according to the present disclosure will be described based on experimental results.

<Irradiation of Processing Liquid Supplied Onto Surface of Substrate with Ultraviolet Ray>

The effect of eliminating electricity from the processing liquid was tested by using the substrate processing apparatus1according to the present disclosure. The light source unit100was configured such that the processing liquid F supplied onto the substrate W was irradiated with the ultraviolet rays as illustrated inFIG. 3. Assuming that one cycle is defined when a spraying process of spraying deionized water (DIW) through the nozzle unit84while rotating the substrate W and a drying process of rotating the substrate at a high speed without supplying the processing liquid are performed, an electrification degree was measured while repeating the process cycle. The spraying process was performed for 60 seconds at 300 rpm, and the drying process was performed for 25 seconds at 1800 rpm. The electrification degree was measured by a static electricity measuring device, and the measurement of the electrification degree was performed on the surface of the substrate W dried after completing the cycle.

Table 1 shows results of comparing measured values based on whether to emit the ultraviolet rays. When no ultraviolet was emitted, as the process was performed, the electrification degree was greatly increased from 5 V before performing the process, and the electrification degree was increased to 160 V after completing three cycles of the process. In contrast, when the ultraviolet lamp was turned on and the ultraviolet ray was emitted during the spraying process and the drying process, the electrification degree was rather decreased from 10 V before performing the process and the electrification degree of 4 V or less was stably maintained.

The light source unit100was configured such that the processing liquid F was irradiated with the ultraviolet rays before the processing liquid F was supplied onto the substrate W as illustrated inFIG. 4, and then the electrification degree was measured. The static electricity measuring device was directed toward the processing liquid which was discharged from the nozzle unit84but not yet supplied onto the substrate W, and the electrified state of the processing liquid was measured before the processing liquid came into contact with the substrate W.

The electrification degree of about 50 to 100 V was measured in the state in which no ultraviolet ray was emitted. In contrast, when the electrification degree was measured after tuning on the ultraviolet lamp, the electrification degree was greatly decreased to about 3 V. Accordingly, it was ascertained that the processing liquid from which electricity was eliminated could be supplied onto the substrate W in the case in which the processing liquid, which was discharged from the nozzle unit84via the processing liquid supply tube90, was irradiated with the ultraviolet rays UV.

While the present disclosure has been described with reference to the limited exemplary embodiments and the drawings, the exemplary embodiments and the drawings are only illustrative, and it may be apparent to those skilled in the art that the exemplary embodiments and the drawings may be variously modified and changed without departing from the technical spirit and scope of the present disclosure. For example, the substrate processing apparatus according to the present disclosure is not limited to the cleaning device, and the substrate processing apparatus may be applied to various devices such as a coating device, an etching device, and an exposure device in which the liquid processing process is performed, and the entirety or parts of the respective exemplary embodiments may be selectively combined and implemented. Accordingly, the protective scope of the present disclosure should be determined by the claims and the equivalents thereto.