Cleaning apparatus and cleaning method

A cleaning apparatus which can efficiently and satisfactorily clean component parts facing narrow spaces. A mixture of a substance in gaseous form and the same substance in liquid form or solid form as the former is jetted out from a jet pipe toward deposits attached to a structural object. The jetted mixture and the deposits to which the mixture has been jetted are sucked into a suction pipe.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a cleaning apparatus and a cleaning method, and more particularly to a cleaning apparatus and a cleaning method that clean narrow spaces in a semiconductor device manufacturing apparatus.

2. Description of the Related Art

In general, substrate processing apparatuses that subject substrates such as wafers for semiconductor devices to predetermined processing have a processing chamber (hereinafter referred to merely as “the chamber”) in which predetermined processing is carried out on a substrate housed therein. Deposits arising from reaction products produced in the predetermined processing are attached to the interior of the chamber. When the deposits float to become particles, and the particles become attached to surfaces of substrates, a short circuit occurs in products such as semiconductor devices manufactured from the substrates, resulting in the yield of the semiconductor devices decreasing. Accordingly, to remove the deposits from the interior of the chamber, manual maintenance such as wet cleaning in the interior of the chamber has been conventionally performed by an operator.

However, since it is difficult for the operator to perform manual maintenance on component parts facing narrow spaces such as a bellows and an exhaust component in the chamber, deposits accumulate on the component parts facing the narrow spaces through the use of the substrate processing apparatus for a long time, and particles produced from the deposits enter into a substrate processing space and become attached to surfaces of substrates. For example, it is thought that deposits accumulated on a component part facing a narrow space in the vicinity of a manifold fall off the component part, particles produced from the accumulated deposits are caused to rebound by rotary blades of an exhaust pump provided in the vicinity of the manifold, and the rebounding particles enter into the substrate processing space and become attached to surfaces of substrates (see, for example, the specification of Japanese Patent Application No. 2006-005344).

Accordingly, to remove deposits accumulated on component parts facing narrow spaces such as a bellows and an exhaust component, suction has been conventionally carried out using a commercially available cleaner such as a cleaner having only a suction port.

However, in the case where deposits are removed by suction using the commercially available cleaner as mentioned above, it is difficult to remove fine deposits by suction, that is, it is difficult to satisfactorily clean component parts facing narrow spaces although relatively large deposits can be removed by suction. Thus, through the use of the substrate processing apparatus for a long time, the fine deposits accumulate on the component parts facing the narrow spaces, and particles produced from the accumulated deposits become attached to surfaces of substrates as mentioned above.

To cope with the above described problem, maintenance on component parts facing narrow spaces such as a bellows and an exhaust component is performed by replacing or disassembling them, but such maintenance requires a lot of time and effort and is very expensive.

SUMMARY OF THE INVENTION

The present invention provides a cleaning apparatus and a cleaning method that can efficiently and satisfactorily clean component parts facing narrow spaces.

Accordingly, in a first aspect of the present invention, there is provided a cleaning apparatus that removes deposits attached to a structural object to clean the structural object, comprising a jetting unit adapted to jet out a mixture of a substance in gaseous form and the same substance in liquid form or solid form as the former toward the deposits, and a suction unit adapted to suck the jetted mixture and the deposits to which the mixture has been jetted.

According to the first aspect of the present invention, since a mixture of a substance in gaseous form and the same substance in liquid form or solid form as the former is jetted out toward deposits attached to a structural object, the deposits to which the mixture has been jetted can be caused to fall off the structural object due to the viscosity, physical impact, entrainment, etc. of the mixture. Then, the jetted mixture and the deposits to which the mixture has been jetted are sucked, so that the deposits having fallen off the structural object can be sucked, and hence even fine deposits that would not be removed merely by suction can be removed. As a result, component parts facing narrow spaces in the substrate processing apparatus can be satisfactorily cleaned, and hence a decrease in the yield of semiconductor devices ultimately manufactured can be prevented.

The present invention can provide a cleaning apparatus, wherein a jet port of the jetting unit opens in a suction port of the suction unit.

According to the first aspect of the present invention, since the jet port of the jetting unit opens in the suction port of the suction unit, a mixture jetted out from the jet port and deposits to which the mixture has been jetted can be reliably sucked through the suction port, and also, the construction of the cleaning apparatus can be simplified.

The present invention can provide a cleaning apparatus, further comprising a pump to which the jetting unit and the suction unit are connected, and wherein the pump comprises a first impeller corresponding to the jetting unit and a second impeller corresponding to the suction unit, and the first impeller is disposed coaxially with the second impeller, and blades of the first impeller have inclinations opposite to inclinations of blades of the second impeller.

According to the first aspect of the present invention, in the pump to which the jetting unit and the suction unit are connected and has the first impeller corresponding to the jetting unit and the second impeller corresponding to the suction unit, the first impeller is disposed coaxially with the second impeller, and the blades of the first impeller have inclinations opposite to inclinations of the blades of the second impeller. As a result, it is possible to cause the jetting unit to jet out gas and cause the suction unit to suck gas at the same time, and in addition, the pump can be made compact.

The present invention can provide a cleaning apparatus, wherein the suction port of the suction unit is disposed in a vicinity of the jet port of the jetting unit.

According to the first aspect of the present invention, since the suction port of the suction unit is disposed in the vicinity of the jet port of the jetting unit, a mixture jetted out from the jet port and deposits to which the mixture has been jetted can be reliably sucked through the suction port. Further, since a high degree of flexibility in arranging the jetting unit and the suction unit is allowed, fine deposits attached to a structural object facing a narrower space can be efficiently and satisfactorily removed.

The present invention can provide a cleaning apparatus, wherein the jetting unit comprises a cylindrical member, and the jetting unit comprises a constricted portion in a vicinity of the jet port.

According to the first aspect of the present invention, since the jetting unit comprised of a cylindrical member has a constricted portion in the vicinity of the jet port, gas jetted out from the jetting unit can be accelerated in the vicinity of the jet port. As a result, a part of the gas can be turned into aerosols in the vicinity of the jet port, and also, a shock wave can be formed by the acceleration of the gas.

The present invention can provide a cleaning apparatus, wherein the jetting unit further comprises a heated gas jetting unit adapted to jet out a heated gas to the deposits, and the suction unit is adapted to suck the jetted heated gas and the deposits to which the heated gas has been jetted.

According to the first aspect of the present invention, since a heated gas is jetted to deposits attached to a structural object, the deposits to which the heated gas has been jetted can be caused to fall off the structural object by thermal stress due to the heated gas, or the like. Then, the jetted heated gas and the deposits to which the heated gas has been jetted are sucked, so that the deposits having falling off the structural object can be sucked, and hence fine deposits can be more efficiently removed.

The present invention can provide a cleaning apparatus, wherein the jetting unit further comprises a vibration-applied gas jetting unit adapted to apply a vibration to a gas and jet out the gas to the deposits, and the suction unit is adapted to suck the jetted vibration-applied gas and the deposits to which the vibration-applied gas has been jetted.

According to the first aspect of the present invention, since a gas to which a vibration (such as a pulse) is applied is jetted to deposits attached to a structural object, the deposits to which the vibration-applied gas has been jetted can be caused to fall off the structural object by a strong physical impact due to collision with molecules or the like in the vibration-applied gas. Then, the jetted vibration-applied gas and the deposits to which the vibration-applied gas has been jetted are sucked, so that the deposits having fallen off the structural object can be sucked, and hence fine deposits can be more efficiently removed.

The present invention can provide a cleaning apparatus, wherein the jetting unit further comprises a unipolar ion jetting unit that jets out unipolar ions to the deposits, and the suction unit further comprises a reverse electric field generator adapted to generate an electric field of a reverse polarity to a polarity of the unipolar ions in the suction part and sucks the jetted unipolar ions and the deposits to which the unipolar ions have been jetted.

According to the first aspect of the present invention, since unipolar ions are jetted to deposits attached to a structural object, the deposits to which the unipolar ions have been jetted can be charged on a single pole by the unipolar ions. Then, an electric field of a reverse polarity to the polarity of the unipolar ions is generated in the suction port, and the jetted unipolar ions and the deposits to which the unipolar ions have been jetted are sucked, so that the deposits charged on the single pole can be caused to fall off the structural object by an attractive force, and the deposits having fallen off the structural object can be sucked, and hence fine deposits can be more efficiently removed.

The present invention can provide a cleaning apparatus, wherein the jetting unit further comprises a plasma jetting unit that jets out plasma to the deposits, and the suction unit is adapted to suck the jetted plasma and the deposits to which the plasma has been jetted.

According to the first aspect of the present invention, since plasma is jetted to deposits attached to a structural object, the deposits to which the plasma has been jetted can be caused to fall off the structural object by a chemical reaction with radicals in the plasma. Then, the jetted plasma and the deposits to which the plasma has been jetted are sucked, so that the deposits having fallen off the structural object can be sucked, and hence fine deposits can be more efficiently removed.

The present invention can provide a cleaning apparatus, wherein the jetting unit further comprises a brush unit adapted to scrub away the deposits, and the suction unit is adapted to suck the deposits scrubbed away by the brush unit.

According to the first aspect of the present invention, since deposits attached to a structural object are scrubbed away, the deposits can be caused to fall off the structural object. Then, the deposits thus scrubbed away are sucked, so that the deposits having fallen off the structural object can be sucked, and hence the deposits can be reliably removed.

The present invention can provide a cleaning apparatus, wherein the jetting unit further comprises a sterilizing unit adapted to sterilize the structural object.

According to the first aspect of the present invention, since a structural object is sterilized, the emission of contaminants caused by the growth of bacteria in the substrate processing apparatus can be prevented.

Accordingly, in a second aspect of the present invention, there is provided a cleaning method of removing deposits attached to a structural object to clean the structural object, comprising a jetting step of jetting out a mixture of a substance in gaseous form and the same substance in liquid form or solid form as the former toward the deposits, and a suction step of sucking the jetted mixture and the deposits to which the mixture has been jetted.

According to the second aspect of the present invention, since a mixture of a substance in gaseous form and the same substance in liquid form or solid form as the former is jetted out toward deposits attached to a structural object, the deposits to which the mixture has been jetted can be caused to fall off the structural object due to the viscosity, physical impact, entrainment, etc. of the mixture. Then, the jetted mixture and the deposits to which the mixture has been jetted are sucked, so that the deposits having fallen off the structural object can be sucked, and hence even fine deposits that would not be removed merely by suction can be removed. As a result, component parts facing narrow spaces in the substrate processing apparatus can be satisfactorily cleaned, and hence a decrease in the yield of semiconductor devices ultimately manufactured can be prevented.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be described in detail below with reference to the drawings showing a preferred embodiment thereof.

First, a description will be given of a substrate processing apparatus to which a cleaning apparatus according to an embodiment of the present invention is applied.

FIG. 1is a sectional view schematically showing the construction of the substrate processing apparatus to which the cleaning apparatus according to the embodiment is applied.

As shown inFIG. 1, the substrate processing apparatus10implemented by an etching processing apparatus that subjects wafers W for semiconductor devices (hereinafter referred to merely as “wafers W”) to plasma processing such as reactive ion etching has a chamber11as a processing chamber made of a metallic material such as aluminum or stainless steel.

The chamber11has disposed therein a lower electrode12as a stage on which is mounted a wafer W having a diameter of, for example, 300 mm and which moves up and down in conjunction with the mounted wafer W in the chamber11, and a shower head13that is disposed in a ceiling portion of the chamber12and in opposed relation to the lower electrode12and supplies a processing gas, described later, into the chamber11.

A lower radio frequency power source14is connected to the lower electrode12via a lower matcher15, and the lower radio frequency power source14supplies radio frequency electrical power of a predetermined frequency to the lower electrode12. The lower matcher15reduces reflection of the radio frequency electrical power from the lower electrode12so as to maximize the efficiency of the supply of the radio frequency electrical power into the lower electrode12.

An ESC16for attracting a wafer W with an electrostatic attracting force is disposed in an upper part of the interior of the lower electrode12. The ESC16has therein an ESC electrode plate17comprised of laminated electrode films, and a direct-current power source18is electrically connected to the ESC electrode plate17. A wafer W is attracted to and held on an upper surface of the ESC16through a Coulomb force or a Johnsen-Rahbek force generated by a direct-current voltage applied from the direct-current power source18to the ESC electrode plate17. An annular focus ring20made of silicon (Si) or the like is disposed around an outer periphery of the ESC16, and the focus ring20focuses plasma produced above the lower electrode12toward the wafer W.

Under the lower electrode12, a support23is disposed extending downward from the bottom of the lower electrode12. The support23supports the lower electrode12and moves the lower electrode12up and down through rotational motion of a ball screw, not shown. Also, the support23is covered by a bellows40and shut off from an atmosphere in the chamber11. The bellows40(structural object) is covered by bellows covers24and25, so that a very narrow space is formed in the vicinity of the bellows40.

A transfer port26for wafers W and an exhaust portion27(structural object) are provided in a side wall of the chamber11. The wafers W are transferred into and out from the chamber11via the transfer port26by a transfer arm, not shown, provided in an LLM (load lock module), not shown, disposed adjacent to the substrate processing apparatus10. The exhaust portion27is connected to an exhaust system that is comprised of an exhaust manifold, an APC (automatic pressure control) valve, a DP (dry pump), a TMP (turbo-molecular pump), and so on, all of which are not shown, and exhausts air or the like from the chamber11to the outside. A very narrow space is formed in the vicinity of the exhaust portion27as well.

In the substrate processing apparatus10, when a wafer W is to be transferred into the chamber11, the lower electrode12moves down so as to be level with the transfer port26, and when plasma processing is to be carried out on the wafer W, the lower electrode12moves up to a processing position for the wafer W. It should be noted thatFIG. 1shows the positional relationship between the transfer port26and the lower electrode12in the case where the wafer W is transferred into the chamber11.

The shower head13is comprised of a disk-shaped upper electrode (CEL)29that faces a processing space S above the lower electrode12and has a large number of gas vent holes28therein, and an electrode support30that is disposed on top of the upper electrode29and detachably supports the upper electrode29. An outer peripheral portion of a surface of the upper electrode29facing the processing space S is covered by an inner peripheral portion of a shield ring35that is an annular member disposed in a ceiling portion of the chamber11. The shield ring35is made of, for example, quartz and protects a screw, not shown, that is disposed at an outer peripheral edge of the upper electrode29and fastens the upper electrode29onto the ceiling of the chamber11, from plasma.

An upper radio frequency power source31is connected to the upper electrode29via an upper matcher32. The upper radio frequency power source31supplies radio frequency electrical power of a predetermined frequency to the upper electrode29. The upper matcher32reduces reflection of the radio frequency electrical power from the upper electrode29so as to maximize the efficiency of the supply of the radio frequency electrical power into the upper electrode29.

A buffer chamber33is provided inside the electrode supporting member30, and a processing gas introducing pipe, not shown, is connected to the buffer chamber33. A processing gas comprised of an oxygen gas (O2), an argon gas (Ar), or a carbon tetrafluoride singly or in combination is introduced to the buffer chamber33via the processing gas introducing pipe, and then the introduced processing gas is supplied into the processing space S via the gas bent holes28.

In the chamber11of the substrate processing apparatus10, radio frequency electrical power is applied to the lower electrode12and the upper electrode29as described above, whereby the processing gas supplied into the processing space S is turned into high-density plasma such as ions and radicals by the applied radio frequency electrical power, so that plasma comprised of ions, radicals, and so on is produced. The plasma thus produced is focused onto a surface of the wafer W by the focus ring19, whereby the surface of the wafer W is physically/chemically etched.

Also, in the chamber11of the substrate processing apparatus10, reaction products are produced during the etching and become attached to component parts in the chamber11, such as the bellows40and the exhaust portion27.

Next, a description will be given of the cleaning apparatus according to the present embodiment. The cleaning apparatus according to the present embodiment is applied particularly to cleaning of component parts facing narrow spaces in the substrate processing apparatus described above.

FIG. 2Ais a diagram schematically showing the construction of the cleaning apparatus according to the present embodiment. It should be noted that the right-hand side ofFIG. 2Ais referred to as “the right side”, and the left-hand side ofFIG. 2Ais referred to as “the left side”.FIG. 2Bis a view schematically showing the construction of an impeller of a pump appearing inFIG. 2A.

As shown inFIG. 2A, the cleaning apparatus100is comprised of a main body120enclosed by a housing, not shown; a double-pipe nozzle110that is comprised of a suction pipe112and a jet pipe114, described later, that penetrate through the housing from inside the main body120and extends rightward in such a manner as to freely bend; a gas supply pipe140that is connected to the jet pipe114inside the main body120and supplies a predetermined gas supplied from a gas supply unit, not shown, into the jet pipe114; a gas exhaust pipe150that is connected to the suction pipe112inside the main body120and exhausts a suction gas in the suction pipe112to the outside; and a harmful matter removal unit130that is disposed part way along the gas exhaust pipe150and outside the main body12.

In the main body120, a pump124shown inFIG. 2B, a particle removal filter122, and a particle monitor121are interposed in this order from the left in the double-pipe nozzle110. The double pipe nozzle110is constructed such that the jet pipe114penetrates through a side face of the suction pipe112at the left side with respect to the pump124and branches off from the suction pipe112, and from this point, the jet pipe114and the suction pipe112function as pipes independent of each other.

As shown inFIG. 2B, the pump124has a central shaft127at the center thereof, and the central shaft127is rotated counterclockwise as viewed inFIG. 2Bby a torque from a motor, not shown, connected to the central shaft127. A plurality of blades126aradially extending outward from the central shaft127are disposed at regular intervals around the periphery of the central shaft127. The central shaft127and the plurality of blades126aconstitute a jet impeller124a, which is interposed in the jet pipe114of the double-pipe nozzle110. The blades126aare provided with inclinations so as to flow gas in the jet port114from the left side to the right side as viewed inFIG. 2Athrough counterclockwise rotation.

Further, the pump124has an annular shaft128that is joined to outer ends of the respective blades126ain the radial direction thereof and is disposed to enclose the blades126a. A plurality of blades125aradially extending outward from the annular shaft128are disposed at regular intervals around the periphery of the annular shaft128. The annular shaft128and the plurality of blades125aconstitute a suction impeller124b, which is interposed in the suction pipe112of the double-pipe nozzle110. The blades125aare provided with reverse inclinations to the inclinations of the blades126aso as to flow gas in the suction pipe112from the right side to the left side as viewed inFIG. 2Athrough counterclockwise rotation.

With this arrangement, the pump124can cause the jet pipe114to jet out gas and cause the suction pipe112to draw in gas by suction at the same time. Moreover, since the suction impeller124band the jet impeller124aare coaxially provided in the pump124, the pump124can be made compact.

Further, in the present embodiment, the annular shaft128may be connected to a motor, not shown, other than the motor connected to the central shaft127without being joined to the inside blades126a, and the inside blades126aand the outer blades125amay be arbitrarily rotated by adjusting torques from the respective motors. Therefore, the level of jet force with which gas is jetted out from the jet pipe114and the level of suction force with which the suction pipe112draws in gas can be arbitrarily adjusted.

The particle removal filter122removes particles in the sucked gas in the suction pipe112. The particle monitor121monitors the amount of particles in the sucked gas in the suction pipe112using a laser light scattering method. By monitoring the amount of particles in the sucked gas, an end point of a cleaning process, described later, can be detected. The harmful matter removal unit130has therein an activated carbon or the like and adsorbs organic matter and harmful matter included in the sucked gas using the activated carbon.

FIG. 3Ais an enlarged sectional view schematically showing the construction of an end portion of the double-pipe nozzle110appearing inFIG. 2A, andFIG. 3Bis a perspective view schematically showing the constructions of the end portion of the double-pipe nozzle110.FIG. 3Ais useful in explaining a case where particles P attached to a surface of a structural object50is cleaned using the double-pipe nozzle110. It should be noted that although structural objects facing narrow spaces include the bellows40and the exhaust portion27, but in the following description, the generalized structural object50is used for the convenience of explanation.

As shown inFIG. 3A, the double-pipe nozzle110has the jet pipe114and the suction pipe112that encloses the jet pipe114, and a jet port114aof the jet pipe114opens in a suction port112aof the suction pipe112. The jet pipe114has a constricted portion114bin the vicinity of the jet port114a, and a predetermined gas supplied by the gas supply pipe140and accelerated to a predetermined flow rate by the pump124is further accelerated in the constricted portion114b. As a result, the pressure of the gas in the constricted portion114bof the jet pipe114rapidly decreases, and a part of the gas coagulates into aerosols due to adiabatic expansion of the gas. Also, the accelerated gas forms a shock wave. Thus, the jet pipe114jets out the gas and the shock wave including the aerosols comprised of the same substance as the gas toward the particles P attached to the surface of the structural object50.

In the present embodiment, in order to cause the jet pipe114to jet out a gas including aerosols, the above-mentioned gas supply unit, not shown, supplies a gas containing components that readily turn into aerosols. Also, since the cleaning apparatus100according to the present embodiment is used under atmospheric pressure and at room temperature, it is preferred that the gas jet out from the jet pipe114is a gas that is held in gaseous form or liquid form under atmospheric pressure and at room temperature and has high sublimation capability and high volatility since there is only a small difference between the fusing point and boiling point of the gas. Examples of the gas supplied from the gas supply unit into the jet pipe114include nitrogen, argon, carbon dioxide, water, and ethanol.

Through numeric simulations and the like, the inventors of the present invention has found that in an environment outside of which there is no motion, the speed of the gas jet out from the jet pipe114reaches its peak within a range of approximately 20 mm from the jet port114a, and thus, the distance L2from the jet port114ato the structural object50is preferably set to be not more than 20 mm. Further, since there may be cases where the gas jet out from the jet pipe114contains harmful matter, the distance L1from the suction port112ato the structural object50is preferably set to be not more than 10 mm to decrease emission of the gas containing harmful matter toward the external atmosphere. Thus, the end portion of the double-pipe nozzle110is preferably shaped such that the suction port112aof the suction pipe112projects out approximately 10 mm from the jet port114aof the jet pipe114.

A description will now be given of a cleaning process using the cleaning apparatus according to the present embodiment.

FIGS. 4A to 4Care process drawings showing the cleaning process using the cleaning apparatus according to the present embodiment.

As shown inFIGS. 4A to 4C, first, a gas and a shock wave including aerosols A comprised of the same substance as the gas are jetted out from the jet port114aof the jet pipe114in the double-pipe nozzle110toward particles P attached to the surface of the structural object50(FIG. 4A).

Next, the particles P attached to the surface of the structural object50are caused to fall off the surface of the structural object50due to the viscosity of the gas, the physical impact of the gas, the physical impact of the aerosols A, the entrainment of the aerosols A, and so on (FIG. 4B).

Then, the particles P caused to fall off the surface of the structural object50are sucked by the suction pipe112through the suction port112aand discharged to the outside (FIG. 4C).

According to the cleaning process inFIGS. 4A to 4C, since a gas and a shock wave including aerosols A comprised of the same substance of the gas are jetted out from the jet port114ato particles P attached to the surface of the structural object50, and the particles P are caused to fall off due to the viscosity of the gas and the like and sucked through the suction port112a, fine particles P (deposits) that would not be removed merely by suction can be removed. As a result, component parts facing narrow spaces in the substrate processing apparatus10can be satisfactorily cleaned, and hence a decrease in the yield of semiconductor devices ultimately manufactured can be prevented.

Further, since aerosols comprised of the same substance as a gas are generated, another substance that readily coagulates does not have to be mixed in the gas, and hence the gas can be easily treated, and also, the construction of the gas supply unit can be simplified.

Next, a description will now be given of cleaning processes using variations of the cleaning apparatus according to the present embodiment. In the variations of the cleaning apparatus, constructions described below are preferably added to the above described construction that the jet pipe114is provided inside the suction pipe112.

FIGS. 5A and 5Bare process drawings showing a cleaning process using a first variation of the cleaning apparatus according to the present embodiment.

First, a heated gas heated by a heating unit141disposed part way along a gas supply pipe140is jetted out from a jet port214aof a heated gas jet pipe214in a nozzle210toward particles P attached to the surface of the structural object50(FIG. 5A).

Next, the particles P to which the heated gas has been jetted are caused to fall off the surface of the structural object50using thermal stress due to the gas and sucked into the suction pipe112through the suction port112aand discharged to the outside (FIG. 5B).

According to the cleaning process inFIGS. 5A and 5B, since a heated gas is jetted out from the jet port214ato particles P, and the particles P are caused to fall off using thermal stress due to the gas and sucked through the suction port112a, the fine particles P can be more efficiently removed.

FIGS. 5C and 5Dare process drawings showing a cleaning process using a second variation of the cleaning apparatus according to the present embodiment.

First, a vibration is applied to a gas by an ultrasonic generator315disposed in a jet port314aof a vibration-applied gas jet pipe314in a nozzle310, and the vibration-applied gas is jetted out from the jet port314aof the vibration-applied gas jet pipe314to particles P attached to the surface of the structural object50(FIG. 5C).

Next, the particles P to which the vibration-applied gas has been jetted are caused to fall off the surface of the structural object50by a strong physical impact due to collision with molecules or the like in the vibration-applied gas caused by the application of the vibration to the gas and sucked into the suction pipe112through the suction port112aand discharged to the outside (FIG. 5D).

According to the cleaning process inFIGS. 5C and 5D, since a vibration-applied gas is jetted out from the jet port314ato particles P, and the particles P are caused to fall off through a strong physical impact due to collision with molecules or the like and sucked through the suction port112a, the fine particles P can be more efficiently removed.

FIGS. 6A and 6Bare process drawings showing a cleaning process using a third variation of the cleaning apparatus according to the present embodiment.

First, unipolar ions I supplied from a unipolar ion supply pipe142are jetted out from a jet port414aof a unipolar ion jet pipe414in a nozzle410to particles P attached to the surface of the structural object50(FIG. 6A).

Next, the particles P to which the unipolar ions I has been jetted are charged on a single pole by the unipolar ions I and caused to fall off the surface of the structural object50by an attractive force from an electric field of the reverse polarity to the polarity of the unipolar ions I generated by an electrode plate415(opposite electric field generator) provided in the vicinity of the suction port112aof the suction pipe112and sucked into the suction pipe112through the suction port112aand discharged to the outside (FIG. 6B).

According to the cleaning process inFIGS. 6A and 6B, since unipolar ions I are jetted out from the jet port414ato particles P so as to charge the particles P by the unipolar ions I, and the particles P are caused to fall off by an attractive force from an electric field of the reverse polarity to the polarity of the unipolar ions I and sucked through the suction port112a, the fine particles P can be more efficiently removed.

Although in the present process, it may be considered that particles P become attached to the electrode plate415provided in the vicinity of the suction port112aof the suction pipe112to reduce the attractive force of the electrode plate415, but the attachment of the particles P to the electrode plate415can be prevented by connecting an oscillator, a heater, or the like to the electrode plate415.

FIGS. 6C and 6Dare process drawings showing a cleaning process using a fourth variation of the cleaning apparatus according to the present embodiment.

First, plasma is generated from a jet port514aof a radical jet pipe514in a nozzle510via an atmospheric plasma generator515, and the plasma, in particular, radicals in the plasma are jetted out toward particles P attached to the surface of the structural object50(FIG. 6C).

Next, the particles P to which the radicals has been jetted are caused to fall off the surface of the structural object50through chemical reaction with the radicals and sucked into the suction pipe112through the suction port112aand discharged to the outside (FIG. 6D).

According to the cleaning process inFIGS. 6C and 6D, since plasma is generated from the jet port514avia the atmospheric plasma generator515, radicals in the plasma are jetted out to the particles P, and the particles P are caused to fall off by a chemical reaction with the radicals and sucked through the suction port112a, the fine particles P can be more efficiently removed.

FIG. 7Ais an enlarged sectional view schematically showing the construction of the essential parts of a fifth variation of the cleaning apparatus according to the present embodiment.

As shown inFIG. 7A, a nozzle610has a jet pipe614, and the suction pipe112that encloses the jet pipe614. The jet pipe614has a rotary brush615in a jet port614aand presses the rotary brush615against particles P attached to the structural object50while rotating the rotary brush615and jets out a gas toward the particles P. Since the gas can be jetted out while the particles P are scrubbed away, the particles P can be reliably caused to fall off, and hence the particles P can be reliably removed.

FIG. 7Bis an enlarged sectional view schematically showing the construction of the essential parts of a sixth variation of the cleaning apparatus according to the present embodiment.

As shown inFIG. 7B, a nozzle710has a jet pipe714, and the suction pipe112that encloses the jet pipe714. The jet pipe714has a low-pressure mercury vapor lamp715in the vicinity of a jet port714aand irradiates an ultraviolet ray having a wavelength of 254 nm from the low-pressure mercury vapor lamp715onto a structural object50and jets out a gas toward particles P. Therefore, the particles P can be removed, and the structural object50can be sterilized, and hence the emission of contaminants caused by the growth of bacteria attached to the structural object50can also be prevented.

FIG. 8Ais a perspective view schematically showing the construction of the essential parts of a seventh variation of the cleaning apparatus according to the present embodiment.

As shown inFIG. 8A, a double-pipe nozzle810has a jet pipe814that has a flat shape, and a suction pipe812that has a flat shape similarly to the jet pipe814and encloses the jet pipe814. A jet port814aof the jet pipe814opens in a suction port812aof the suction pipe812. Therefore, fine particles P can be removed by carrying out any of the cleaning processes described above. Also, since the double-pipe nozzle810is comprised of the jet pipe814and the suction pipe812that have a flat shape, which is suitable for scrubbing, a structural object can be cleaned by scrubbing with the tip of the double-pipe nozzle810.

FIG. 8Bis an enlarged sectional view schematically showing the construction of the essential parts of an eighth variation of the cleaning apparatus according to the present embodiment.

As shown inFIG. 8B, it may be configured such that a jet pipe914and a suction pipe912do not constitute a double-pipe structure, but instead, a suction port912aof the suction pipe912is disposed in the vicinity of the jet port914aof the jet pipe914. In the present variation as well, fine particles P can be removed by carrying out any of the cleaning processes described above. Also, in the present variation, since a high degree of flexibility in arranging the jet pipe914and the suction pipe912is allowed, fine particles P attached to a structural object facing a narrower space can be efficiently and satisfactorily removed.

Although in the above described embodiment, it is assumed that the substrate processing apparatus to which the present invention is applied is the etching processing apparatus as the semiconductor device manufacturing apparatus, the substrate processing apparatus to which the present invention may be applied is not limited to this, but the present invention may be applied to semiconductor device manufacturing apparatuses such as deposition apparatuses using a CVD (Chemical Vapor Deposition) method, a PVD (Physical Vapor Deposition) method, and so on. Further, the present invention may be applied to any substrate processing apparatuses such as an ion plantation apparatus, a vacuum transfer apparatus, a heat processing apparatus, an analyzer, an electron accelerator, a FPD (Flat Panel Display) manufacturing apparatus, a solar cell manufacturing apparatus, an etching apparatus as a physical quantity analyzer, and a deposition apparatus insofar as they have a narrow space therein.

Further, the present invention should not necessarily be applied to substrate processing apparatuses, but may be applied to, for example, cleaning apparatuses for medical appliances.