CN101123178A - Plasma processing device - Google Patents
Plasma processing device Download PDFInfo
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- CN101123178A CN101123178A CNA2007101535704A CN200710153570A CN101123178A CN 101123178 A CN101123178 A CN 101123178A CN A2007101535704 A CNA2007101535704 A CN A2007101535704A CN 200710153570 A CN200710153570 A CN 200710153570A CN 101123178 A CN101123178 A CN 101123178A
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Abstract
A plasma processing device having a plasma generation unit and a chamber housing a substrate to be processed thereinside, wherein a process gas introducing mechanism, which is provided between the plasma generation unit and the chamber to introduce a process gas into a process space defined by the plasma generation unit and the chamber, is formed with a gas introducing path that supports a plasma generation unit, is mounted on the chamber and introduces a process gas into a process space, and which has a gas introducing base having at the center thereof a hole forming part of the process space and an almost annular gas introducing plate removably attached to the hole of the gas introducing base and having a plurality of gas emitting holes communicating with the process space from the gas introducing path to emit a process gas into the process space.
Description
The application be that April 28, application number in 2004 are 200480001036.6 the applying date, denomination of invention divides an application for the patent application of " process gas introducing mechanism and plasma processing apparatus ".
Technical field
The present invention relates to import the process gas introducing mechanism of the processing gas that is used for processing substrate and import and handle the plasma processing apparatus that gas carries out the plasma treatment of substrate.
Background technology
In semiconductor manufacturing process, for example, the Ti film is formed on the bottom of the contact hole that forms in the silicon wafer as handled object, diffuse to form TiSi mutually by Ti and substrate Si, on it, form the barrier layer of TiN etc., further on it, form Al layer, W layer, Cu layer etc. and carry out the formation with distribution imbedded in hole.So far, in order to implement so a succession of operation, with metal film-forming system with the such a plurality of containers of combined utensil type.In this metal film-forming system,, implement to remove the processing of the natural oxide film that on silicon wafer, forms and etch damage layer etc. earlier in order to obtain excellent contact before film forming is handled.As the device of removing this natural oxide film, the device that forms inductively coupled plasma with hydrogen and argon gas is well-known (Japanese kokai publication hei 4-336426 communique).
Again, as forming the device that inductively coupled plasma is handled, known have, on the top that disposes as the chamber of the semiconductor wafer of handled object the bell jar that is made of dielectric is set, in the coil inductance that its peripheral part is reeled and is connected with the RF power supply, produce the formation (Japanese kokai publication hei 10-258227 communique, Japanese kokai publication hei 10-116826 communique, Japanese kokai publication hei 11-67746 communique, Japanese 2002-237486 communique) of inductively coupled plasma.
As this inductive couple plasma processing device, be that as shown in fig. 1 its part is such, import the device that ring 408 usefulness screws fixedly comprise the plasma generating unit 400 of bell jar 401, coil 403, not shown RF power supply etc. and accommodate the chamber 201 of handled object through being used to import the gas of handling gas.Specifically, with screw component 410 and bell jar pressing piece 409 bell jar 401 being fixed on gas imports on the ring 408.At this moment, bell jar pressing piece 409 and gas import between ring 408 and the bell jar 401, for example, for example insert the ring-type padded coaming 409a of the resin formation that is waited by PTFE (polytetrafluoroethylene), protect bell jar 401.
Form to keep the gas of bell jar 401 to import ring 408 and keep, this lid pedestal 407 is positioned in structure on the chamber 201 by lid pedestal 407.
Bell jar 401 and gas import between the ring 408 and lid pedestal 407 and chamber 201 between insert the encapsulant 413 and 414 of O ring for example etc., maintenance air-tightness.
Formation is incited somebody to action for example Ar gas and H from gas lead-in groove 408b by the gas orifice 408a that is communicated with this gas lead-in groove 408b
2The processing gas of gas etc. imports the structure of handling space 402.Processing gas to such importing carries out plasma excitation, and the semiconductor wafer as processed substrate is carried out plasma treatment.
At this moment, by plasma treatment, for example the material that disperses that is produced by sputter etching forms deposit attached to the side that gas imports ring 408 and lid pedestal 407.Exist when this deposit thickens, peel off the formation particle, make the operating efficiency of device reduce the problem of the rate of finished products reduction of semiconductor device etc. from the place of piling up.
For this reason, be formed on and handle in the space 402, the mode that imports ring 408 and lid pedestal 407 with the covering above-mentioned gas uses screw 412 that the structure of protective covers 411 is installed.When on this protective cover 411, being attached with by dispersing during material that etching produces, unload screw 412 these protective covers 411 of displacement by loading onto, prevent owing to storing up of deposit produces particle.
Again, the mode with the diffusion that do not cover the processing gas that imports from gas orifice 408a is provided with the hole portion 411a bigger than the diameter of gas orifice 408a in protective cover 411.Therefore, gas import ring 408 gas orifice 408a around adhere to deposit.Thereby, when maintenance, need import ring 408 with protective cover 411 also substitution gas.
But, exist when displacement protective cover 411, need to take out bell jar 401, gas importing ring 408 and lid pedestal 407, maintenance needs the problem of spended time.Again, gas imports ring 408 and is, forms the complex structure of gas flow path 408b etc., the main cause that the operating cost that becomes expense height, the device of displacement parts rises, the productivity of semiconductor device reduces.
On the other hand, in this induction coupled mode plasma processing apparatus, do not study the shape in the processing space that gives plasma treatment in great detail, exist the not necessarily abundant such problem of plasma processing uniformity.
Again, as the structure of the pedestal of mounting wafer in forming the container of plasma, known have a position (TOHKEMY 2002-151412 communique) that the retaining zone of wafer is whittled into the concavity decision wafer of prescribed depth.
But, when adopting the structure of this pedestal, also produce the insufficient such problem of plasma processing uniformity.
Summary of the invention
The expense that the purpose of this invention is to provide the displacement parts in the time of can cutting down maintenance, the process gas introducing mechanism and the plasma processing apparatus of reduction operating cost.
Other purpose of the present invention provides easy maintenance, the plasma processing apparatus that can shorten maintenance time.
Another object of the present invention provides with in the plasma treatment of inductively coupled plasma, can improve the plasma processing apparatus of the inner evenness of handled object.
Another purpose of the present invention provides the versatility that design and cost of manufacture is risen and do not damage the device formation, can improve the plasma processing apparatus of the inner evenness of handled object.
If according to first viewpoint of the present invention, a kind of process gas introducing mechanism is provided, wherein, this process gas introducing mechanism, have the plasma generating unit and accommodating in the plasma processing apparatus of chamber of processed substrate in inside, be arranged between above-mentioned plasma generating unit and the above-mentioned chamber, import in the processing space that is divided into by above-mentioned plasma generating unit and above-mentioned chamber handling gas, it has: support above-mentioned plasma generating unit and be positioned in the above-mentioned chamber, formation will be handled the gas importing path that gas imports above-mentioned processing space, and the gas that has the hole portion of a part that becomes above-mentioned processing space in the central imports pedestal; With can be installed in the above-mentioned hole portion that above-mentioned gas imports pedestal with taking out, have from above-mentioned gas import path be communicated to above-mentioned processing space and above-mentioned processing gas is ejected into above-mentioned processing space a plurality of gas squit holes formation roughly the gas of ring-type import plate.
If according to second viewpoint of the present invention, provide a kind of plasma processing apparatus, possess: the plasma generating unit that produces plasma; Accommodate the chamber of processed substrate in inside; And be arranged between above-mentioned plasma generating unit and the above-mentioned chamber, the processing gas that plasma is formed usefulness imports the process gas introducing mechanism in the processing space that is divided into by above-mentioned plasma generating unit and above-mentioned chamber, above-mentioned process gas introducing mechanism has: support above-mentioned plasma generating unit and be positioned in the above-mentioned chamber, formation will be handled the gas importing path that gas imports above-mentioned processing space, and the gas that has the hole portion of a part that becomes above-mentioned processing space in the central imports pedestal; With can be installed in the above-mentioned hole portion that above-mentioned gas imports pedestal with taking out, have from above-mentioned gas import path be communicated with above-mentioned processing space and above-mentioned processing gas is ejected into above-mentioned processing space a plurality of gas squit holes, form roughly that the gas of ring-type imports plate.
If according to the 3rd viewpoint of the present invention, then provide a kind of plasma processing apparatus, possess: the plasma generating unit that produces plasma; Accommodate the chamber of processed substrate in inside; Be arranged between above-mentioned plasma generating unit and the above-mentioned chamber, support above-mentioned plasma generating unit and be positioned on the above-mentioned chamber, the processing gas that plasma is formed usefulness imports the process gas introducing mechanism in the processing space that is divided into by above-mentioned plasma generating unit and above-mentioned chamber; With with the relative above-mentioned chamber of above-mentioned process gas introducing mechanism and the mechanism for assembling-disassembling of dismounting with above-mentioned plasma generating unit.
If according to first and second viewpoints of the present invention, then be because make gas import base structure, support plasma generating unit also is positioned in the above-mentioned chamber, formation will be handled the gas importing path that gas imports above-mentioned processing space, the hole portion that has a part that becomes above-mentioned processing space in the central, and gas is imported plate can be installed in the above-mentioned hole portion that above-mentioned gas imports pedestal with taking out, this gas imports plate to have and imports path from above-mentioned gas and be communicated to above-mentioned processing space and above-mentioned processing gas is ejected into a plurality of gas squit holes in above-mentioned processing space and forms roughly ring-type, so the simple structureization of process gas introducing mechanism, and make the displacement of consumable part become easy.Therefore, can shorten maintenance time, improve the operating efficiency of plasma processing apparatus, improve productivity.Because make the simple structureization of above-mentioned process gas introducing mechanism,, can force down the manufacturing cost of plasma processing apparatus so can force down the manufacturing cost of this process gas introducing mechanism again.
If according to the 3rd viewpoint of the present invention, then because be provided with the mechanism for assembling-disassembling that the relative above-mentioned chamber with the plasma generating unit of process gas introducing mechanism can be carried out dismounting, so maintenance can be shortened maintenance time easily.
If according to the 4th viewpoint of the present invention, then provide a kind of conduct that processed substrate is carried out the plasma processing apparatus of plasma treatment, this plasma processing unit comprises: the chamber of accommodating handled object; Have in the mode that is communicated with chamber and be wound on the outer periphery of above-mentioned bell jar with being arranged on the bell jar that constitutes by dielectric of above-mentioned chamber top and coiled type and in above-mentioned bell jar, form the antenna of induction field, make the plasma generating unit of plasma generation towards the inboard of above-mentioned bell jar; Be arranged between above-mentioned plasma generating unit and the above-mentioned chamber, the processing gas that plasma is formed usefulness imports the gas introducing mechanism in the processing space that is divided into by above-mentioned plasma generating unit and above-mentioned chamber; With the mounting table that is arranged on the mounting handled object in the above-mentioned chamber, the flat ratio K that is represented by the ratio D/H of the inter normal height H of the central portion of the inside diameter D of above-mentioned bell jar and above-mentioned bell jar is 1.60～9.25.
If according to the 5th viewpoint of the present invention, then provide a kind of conduct that processed substrate is carried out the plasma processing apparatus of plasma treatment, this plasma processing unit comprises: the chamber of accommodating handled object; Have in the mode that is communicated with chamber and be wound on the outer periphery of above-mentioned bell jar with being arranged on the bell jar that constitutes by dielectric of above-mentioned chamber top and coiled type and in above-mentioned bell jar, form the antenna of induction field, make the plasma generating unit of plasma generation towards the inboard of above-mentioned bell jar; Be arranged between above-mentioned plasma generating unit and the above-mentioned chamber, the gas that plasma is formed usefulness imports the gas introducing mechanism in the processing space that is divided into by above-mentioned plasma generating unit and above-mentioned chamber; With the mounting table that is arranged on the mounting handled object in the above-mentioned chamber, the flat ratio K1 that is represented by the ratio D/H1 from the top plate portion of central portion to the distance H 1 of above-mentioned mounting table of the inside diameter D of above-mentioned bell jar and above-mentioned bell jar is 0.90～3.85.
The the 4th and the 5th viewpoint of the invention described above, present inventors find, in processing unit with inductively coupled plasma as described above, the height of bell jar influences the difference of the processed relatively substrate of plasma distribution density greatly, particularly, for bigbore silicon wafer is being carried out improving inner evenness in the plasma treatment as described above, the height optimization that makes bell jar is effective.
If according to the 4th viewpoint of the present invention, then because the flat ratio K that makes portion within it form the bell jar of plasma is 1.60～9.25 big value, so the plasma that the bell jar above the processed substrate that is positioned on the mounting table forms is along the treated side expansion of handled object, the density distribution of plasma is along above-mentioned treated side homogenizing.Therefore, improved the inner evenness of the handled object in the plasma treatment.
If according to the 5th viewpoint of the present invention, be 0.90～3.85 big value then because the bell jar flat ratio K1 of the height from mounting table to the bell jar top plate portion has been considered in order, so the plasma that the bell jar above the handled object that is positioned on the mounting table forms is along the treated side expansion of handled object, the density distribution of plasma is along above-mentioned treated side homogenizing.Therefore, improved the inner evenness of the handled object in the plasma treatment.
Further, in the above-mentioned the 4th and the 5th viewpoint, can only make bell jar flat, and chamber portion is in addition intactly used existing formation, can not cause the cost up that causes by the design alteration of chamber interior etc. and reduce ground, improve the inner evenness of the handled object in the plasma treatment by the versatility that the change of the outside joint construction of chamber portion etc. causes.
If according to the 6th viewpoint of the present invention, then provide a kind of conduct that processed substrate is carried out the plasma processing apparatus of plasma treatment, it comprises: the chamber of accommodating handled object; Have in the mode that is communicated with chamber and be wound on the outer periphery of above-mentioned bell jar with being arranged on the bell jar that constitutes by dielectric of above-mentioned chamber top and coiled type and in above-mentioned bell jar, form the antenna of induction field, make the plasma generating unit of plasma generation towards the inboard of above-mentioned bell jar; Be arranged between above-mentioned plasma generating unit and the above-mentioned chamber, the gas that plasma is formed usefulness imports the gas introducing mechanism in the processing space that is divided into by above-mentioned plasma generating unit and above-mentioned chamber; Be arranged on the mounting table of the support handled object in the above-mentioned chamber; With the mask that is constituted, covered above-mentioned mounting table and the above-mentioned handled object of mounting by dielectric, aforementioned mask constitutes the first area of the above-mentioned handled object of mounting and the second area on every side of above-mentioned first area has equal height.
The 6th viewpoint of the invention described above is in order to solve the wafer retaining zone is carved in the dished shape at existing pedestal, the impedance ratio central portion height of the peripheral part of spill, the inner evenness that make plasma treatment of exerting one's influence such as bias voltage that form plasma are reduced such problem, because in the mask of the mounting table of mounting handled object, formation makes the identical and smooth formation of height of the second area of the first area of mounting handled object and its periphery, impedance homogenizing in first and second zones when so plasma forms, in the distribution density homogenizing of the periphery and the central portion ionic medium body of handled object, can improve the inner evenness of the handled object in the plasma treatment.
Description of drawings
Fig. 1 is the figure of a part that amplifies the summary of existing plasma processing apparatus.
Fig. 2 is the sectional view of the summary of the expression plasma processing apparatus relevant with first execution mode of the present invention.
Fig. 3 is the sectional view that the gas introducing mechanism part of the plasma processing apparatus relevant with first execution mode of the present invention is amplified in expression.
Fig. 4 A is the stereogram that expression constitutes the gas importing pedestal of gas introducing mechanism.
Fig. 4 B is the sectional view that this gas of expression imports pedestal.
Fig. 5 A is the stereogram that expression constitutes the gas importing plate of gas introducing mechanism.
Fig. 5 B is the sectional view that this gas of expression imports plate.
Fig. 6 is the sectional view that the part of gas introducing mechanism is amplified in expression.
Fig. 7 is the sectional view of the variation of expression gas introducing mechanism.
Fig. 8 is the stereogram of the outward appearance of the expression plasma processing apparatus relevant with first execution mode of the present invention.
Fig. 9 is the sectional view of the expression plasma processing apparatus relevant with second execution mode of the present invention.
Figure 10 A is the Ar of the Ar plasma of the existing plasma processing apparatus of expression
+The figure of analog result of density distribution.
Figure 10 B is the Ar in the plasma of representing in the plasma processing apparatus relevant with second execution mode of the present invention
+The figure of analog result of density distribution.
Figure 11 is the curve chart of an example of effect of the bell shape of the expression plasma processing apparatus relevant with second execution mode of the present invention.
Figure 12 is the sectional view of the variation of the expression plasma processing apparatus relevant with second execution mode of the present invention.
Figure 13 is the summary sectional view of the semiconductor wafer mounting structure in the expression plasma processing apparatus relevant with the 3rd execution mode of the present invention.
Figure 14 is the sectional view that amplifies the semiconductor wafer mounting structure of expression Figure 13.
Figure 15 is the plane graph of the semiconductor wafer mounting structure of expression Figure 13.
Figure 16 is the curve chart of the relation of the step difference of the semiconductor wafer mounting part of expression in the 3rd execution mode of the present invention and etching result error.
Embodiment
Below, we are with reference to the description of drawings embodiments of the present invention.
First execution mode
Fig. 2 is the skeleton diagram of the formation of the expression plasma processing apparatus relevant with first execution mode of the present invention.Plasma processing apparatus 100 is the devices that processed substrate carried out plasma treatment, for example is used for plasma etching and removes on the metal film that forms on the processed substrate and the operation of the impurity layer that comprises oxide-film of the natural oxide film that forms on silicon wafer etc.
Above chamber 10, with the continuous mode of chamber 10, be provided as the bell jar 41 of the inscape of plasma generating unit 40.Bell jar 41 forms the cylindric of the top obturation that is made of dielectric, for example dome.And, constituting container handling by chamber 10 and bell jar 41, its inside becomes above-mentioned processing space S.
Wafer maintaining part 20 has the pedestal (mounting table) 21 that is made of dielectric substance that is used for flatly supporting as the semiconductor wafer W of handled object, and this pedestal 21 is configured in the state that the support component 22 that is made of dielectric substance cylindraceous supports.In addition, both can be on pedestal 21 recess of formation and the roughly the same shape of wafer W, make wafer W fall into this recess, also can Electrostatic Absorption mechanism be set on pedestal 21 and carry out Electrostatic Absorption.As the dielectric substance that constitutes pedestal 21, can enumerate ceramic material, for example AlN, Al
2O
3, wherein the AlN that heat conductivity is high is preferred.
In the periphery of pedestal 21, the mode that is positioned in the edge of the wafer W on the pedestal 21 with covering can be provided with shading ring (shadow ring) 23 up and down.Shading ring 23 plays the focusing plasma, forms the effect of uniform plasma.Also has the effect that protection pedestal 21 is avoided plasma again.
Top in pedestal 21, planar buried the establishing by what metals such as Mo, W constituted of level forms netted electrode 24, is used for adding that through adaptation 26 high frequency bias introduces the high frequency electric source 25 of ion and be connected with this electrode 24 on wafer.
Again, in pedestal 21, the lower position that is formed on electrode 24 is buried heater 28 underground, by powering to heater 28 from heater power source 29, can make wafer W be heated to the formation of set point of temperature.In addition, make the slotting inside of support component 22 of leading to of supply lines of electrode 24 and heater 28.
In pedestal 21, insert to lead to and be used for supporting and the wafer lift pins 31 of 3 (figure only illustrates 2) of lifting wafer W, top can the giving prominence to of pedestal 21 is provided with this pin 31 with submerging.These wafer lift pins 31 are fixed on the supporting bracket 32, make their liftings through supporting brackets 32 by the elevating mechanism 33 of cylinder etc.
In the inside of the body 11 of chamber 10, can freely load onto the cavity shield spare 34 roughly cylindraceous that forms that is provided for preventing on the inwall of body 11, adhering to the secondary product that generates by plasma etching etc. along its inwall with unloading.This cavity shield spare 34 is made of Ti material (Ti or Ti alloy).Also can use the Al material as shielding material, but because in processing, produce particle with the Al material, so preferably use the Ti material that can reduce the particle generation with the adhesiveness height of attachment significantly.Again, also can coat Ti on the shielding part body of Al material uses.Further, in order to improve the adhesiveness with attachment, also can make the surface of cavity shield spare 34 become small concaveconvex shape with plasma treatment etc.By number place's (2 places in the drawings) nut 35 this cavity shield spare 34 is installed on the diapire of body 11 of chamber 10,, can takes out cavity shield spares 34, can easily carry out the maintenance in the chamber 10 from the body 11 of chamber 10 by the nut 35 of back-outing.
The sidewall of chamber 10 has opening 36, opens and closes this opening 36 with gate valve 37.In the state of opening this gate valve 37, transport semiconductor wafer W between in the load locking room (not shown) of adjacency and chamber 10.
The mode of the circular hole that forms with the diapire central portion that covers body 11 is provided with the exhaust chamber 12 of chamber 10 downwards highlightedly.Blast pipe 38 is connected with the side of exhaust chamber 12, and exhaust apparatus 39 is connected with this blast pipe 38.And, can make the specified vacuum degree that reduces pressure equably in chamber 10 and the bell jar 41 by making this exhaust apparatus 39 work.
Above-mentioned plasma generating unit 40 has above-mentioned bell jar 41, is wound on the coil 43 as antenna element in the outside of bell jar 41, to the high frequency electric source 44 of coil 43 supply high frequency power, with covering bell jar 41 and coil 43, the ultraviolet ray and the shielding electromagnetic waves container 46 of shielding plasma.
Above-mentioned high frequency electric source 44 is connected with coil 43 through adaptation 45.High frequency electric source 44 produces for example high frequency power of 300kHz～60MHz frequency.Frequency is 450kHz～13.56MHz preferably.By from high frequency electric source 44 to coil 43 supply high frequency power, in the processing space S of the inboard of bell jar 41, form induction field through the side wall portion 41a of the bell jar 41 that constitutes by dielectric substance.
So, the gas through gas introducing mechanism 50 imports path 48e and imports Ar gas and the H that the gas squit hole 49a that forms in the plate 49 will supply to the conduct processing gas of gas introducing mechanism 50 through the gas line 65 of gas supply mechanism 60 at gas
2Gas etc. are ejected into to be handled in the space S, undertaken plasmaization by the induction field that forms as described above in handling space S, forms inductively coupled plasma.
Below, we describe the structure of gas introducing mechanism 50 in detail.
As representing enlargedly among Fig. 3, form the first gas flow path 48a that is connected with gas importing path 11b that wall portion at the body 11 of chamber 10 forms in gas imports pedestal 48, this first gas flow path 48a is connected with the second gas flow path 48b that forms ring-type roughly or semicircle shape in gas importing pedestal 48.Uniformly-spaced or diagonally form many articles the 3rd gas flow path 48c towards the inboard from the second gas flow path 48b again.On the other hand, import between pedestal 48 and the gas importing plate 49 at gas, the 4th gas flow path 48d of the roughly ring-type that formation gas can evenly spread, above-mentioned the 3rd gas flow path 48c is connected with the 4th gas flow path 48d.And these first～the 4th gas flow path 48a, 48b, 48c, 48d are communicated with formation gas and import path 48e.
Processing gas from gas line 65 imports imports path 11b through gas, from the first gas flow path 48a that forms in gas imports pedestal 48, is diffused into equably among the second gas flow path 48b of ring-type roughly or the formation of semicircle shape ground.And, handle gas, through being communicated with this second gas flow path 48b, many articles the 3rd gas flow path 48c towards the direction of handling space S reach roughly the 4th gas flow path 48d of ring-type.
On the other hand, as mentioned above, import in the plate 49 at gas, equally spaced form a plurality of gas squit hole 49a that are communicated with the 4th gas flow path 48d and processing space S, will handle gas from the 4th gas flow path 48d through gas squit hole 49a and be ejected into the processing space S.Again, import at gas the path 11b and the first gas flow path 48a the coupling part around, sealing ring 52 is set, keep supplying with the air-tightness in the path of handling gas.
Again, gas importing pedestal 48 is formed as described above the structure on the body 11 that keeps bell jar 41 and be positioned in chamber 10.At this moment, import between pedestal 48 and the bell jar 41 and gas imports between the body 11 of pedestal 48 and chamber 10,, keep handling the air-tightness of space S respectively through the encapsulant 53 and 54 of for example O ring etc. at gas.
Below, we illustrate in greater detail, and the gas that constitutes above-mentioned process gas introducing mechanism 50 imports pedestal 48 and gas imports plate 49.
Fig. 4 A, 4B are the figure that expression gas imports pedestal 48, and Fig. 4 A is its stereogram, and Fig. 4 B is the A-A sectional view among Fig. 4 A.Gas imports pedestal 48 and for example is made of the metal material of Al etc., shown in Fig. 4 A, becomes the structure that forms the hole 48f of circular in its central authorities, and in the time of in being installed to plasma processing apparatus 100, hole 48f forms a part of handling space S.Import in the pedestal 48 at gas, shown in the cross section of Fig. 4 B, form above-mentioned first～the 3rd gas flow path 48a, 48b, 48c, the 3rd gas flow path 48c is communicated with space 48d '.The inner peripheral surface that imports pedestal 48 at gas forms stage portion, and the stage portion that gas imports plate 49 engages with this stage portion.And, when gas being imported plate 49 when being installed in gas and importing on the pedestal 48, formation the 4th gas flow path 48d in the part corresponding with space 48d '.
Fig. 5 A, 5B are the figure that expression gas imports plate 49, and Fig. 5 A is its stereogram, and Fig. 5 B is the B-B sectional view among Fig. 5 A.
Gas imports roughly ring-type of 49 one-tenth of plates, for example constitutes by the metal material of Ti or Al etc. or by the coating material of coating Ti on the Al mother metal such as meltallizing.Gas imports plate 49 and has body 49b cylindraceous with stage portion and the 49c of blade of a sword portion that forms in its lower edge portion, along the side face of body 49b a plurality of above-mentioned gas squit hole 49a is set.In the 49c of blade of a sword portion, be formed for inserting logical above-mentioned screw 56 and be fixed on gas and import a plurality of fixing hole 49d on the pedestal 48 again.
Fig. 6 represents that gas is imported pedestal 48 and gas importing plate 49 is joined together, the state of using screw 56 to fix.As shown in Figure 6, they are combined, fix them in that gas is imported in the consistent state of the stage portion of pedestal 48 and stage portion that gas imports plate 49 with screw 56.And, at this moment, form the 4th gas flow path 48d between the two, from the gas squit hole 49a ejection gas that is communicated with the 4th gas flow path 48d.Gas imports plate 49 to have and can easily be installed in gas by screw 56 and import on the pedestal 48 and from gas and import the structure that pedestal 48 unloads.
As shown in Figure 7, also can form the shape that has from the expansion of the 4th gas flow path 48d one side direction processing space S one side, for example coniform, trumpet-shaped gas squit hole 49a '.Therefore, can high efficiency will handle the vast processing space S of gas supply equably.
Below, we illustrate the above such gas introducing mechanism 50 and the mechanism for assembling-disassembling of plasma generating unit 40 with reference to Fig. 8 of the outward appearance of expression plasma processing apparatus 100.
As shown in Figure 8, mechanism for assembling-disassembling 70 have the gas that is installed in the periphery of regulation gas introducing mechanism 50 with screw 72c import plate 48 an avris 2 first hinge parts 72 and be arranged between these 2 first hinge parts 72, be fixed on the two or two hinge parts 73 on the body 11 of chamber 10 with screw 73c.Central part in hinge parts 72 and 73 is provided with through hole ring 72a, 73a respectively, inserts axis 71 in these through hole rings 72a, 73a.Therefore, can be the installment state that the body 11 of the gas introducing mechanism 50 of the rectangle rectangle identical with the profile of chamber 10 with formation lumps together from making profile, enter into axle 71 as center of rotation, make gas introducing mechanism 50 and plasma generating unit 40 turn to the top, take out their state from chamber 10.That is, can easily load onto by mechanism for assembling-disassembling 70 and to unload gas introducing mechanism 50 and plasma generating unit 40, in making gas introducing mechanism 50 and plasma generating unit 40 state above turning to, can easily keep in repair chamber 10.
Again, mechanism for assembling-disassembling 70 has vibration absorber 75.By fixed part 75a one end of vibration absorber 75 is fixed on the gas importing pedestal 48, the other end is fixed on the body 11 of chamber 10.
Below, the work of treatment that our explanation is undertaken by the plasma processing apparatus 100 that as above constitutes.
At first, the valve 37 that opens the sluices is transported into wafer W in the chamber 10 with the not shown arm that transports, and wafer W is sent on the outstanding wafer lift pins 31 of pedestal 21.Secondly, 31 times general who has surrendered's wafer W of wafer lift pins are positioned in above the pedestal 21, shading ring 23 is descended.
After this, closed shutter valve 37, by carrying out the decompression state that exhaust reaches regulation in 39 pairs of chambers 10 of exhaust apparatus and the bell jar 41, will be from the Ar gas and the H of gas supply mechanism 60 supplies at this decompression state through gas introducing mechanism 50
2Gas blowout goes out to handling space S.Meanwhile, by from high frequency electric source 25 and high frequency electric source 44, high frequency power is supplied with electrode 24 and coil 43 in the pedestal 21 respectively, produce electric field in handling space S, excitation imports the gas in the bell jar 41, and igniting produces plasma.
After igniting produces plasma, sense of movement induced current in bell jar 41, generate plasma continuously, remove the natural oxide film that on wafer W, forms, for example at silica that forms on the silicon wafer and the metal oxide film that on metal film, forms by this plasma etching.At this moment, on pedestal 21, add bias voltage, wafer W is remained on the set point of temperature by heater 28 by high frequency electric source 25.
At this moment condition is, for example, handles the pressure of space S: 0.1～13.3Pa, preferred 0.1～2.7Pa, chip temperature: 100～500 ℃, gas flow: Ar are 0.001～0.03mL/min, H
2Be 0～0.06L/min, preferred 0～0.03L/min, generate the frequency of the high frequency electric source 44 that plasma uses: 300kHz～60MHz, the power of the high frequency electric source 25 that preferred 450kHz～13.56MHz, power: 500～3000W, bias voltage are used: 0～1000W (as bias-20～-200V).At this moment plasma density is 0.7～10 * 10
10Atoms/cm
3, preferred 1～6 * 10
10Atoms/cm
3Under this condition,, for example remove silicon oxide layer (SiO by about 30 seconds processing
2) about 10nm.
So, for example improved the adhesiveness of the film that after this forms, reduced the effect of resistance value etc. by removing the impurity layer that comprises oxide of natural oxide film etc.
At this moment, the gas introducing mechanism 50 of gas is handled in ejection, as mentioned above, has both on function that keeps bell jar 41 and the body 11 that simultaneously is positioned in chamber 10 and keeps air-tightness, and one side will be handled gas and import the function of handling space S.Therefore, have the component count of cutting down plasma processing apparatus, make simple structureization, reduce the effect of plasma processing apparatus cost.
Again, when as described above semiconductor wafer W being carried out plasma treatment when implementing sputter etching, because sputter, the heap material that disperses on the parts around the semiconductor wafer W, become the atomic reason that produces particle etc., the rate that manufactures a finished product of semiconductor device is descended.For example, the part of particularly storing up deposit on the parts around the semiconductor wafer W, for example the heap material that disperses easily around gas vent 49a.
Therefore, in the present embodiment, formation imports plate 49 with screw 56 with gas and is installed on the gas importing pedestal 48, can take out the structure that gas imports plate 49.Therefore, substitution gas imports plate 49 easily, can shorten maintenance time.Again, gas imports plate 49 becomes the simple cheap parts of structure, the expense in the time of can forcing down maintenance.
Again, because as mentioned above can enough mechanism for assembling-disassembling 70 can easily load onto and unload gas introducing mechanism 50 and plasma generating unit 40, so when the repetition plasma treatment needs repairing, can shorten the maintenance time of plasma processing apparatus 100, improve work ratio, thereby improve the productivity of semiconductor device.
Specifically, when exchange during bell jar 41 and when wet the operation of cleaning etc., carry out in the situation of maintenance of chamber 10, need to take out plasma generating unit 40, but plasma generating unit 40 is taken out rotationally with gas introducing mechanism 50, can carry out these maintenance activities at short notice.
Again, unload gas introducing mechanism 50 and plasma generating unit 40 because can so easily load onto, so when can easily and at short notice taking out gas introducing mechanism 50 and plasma generating unit 40 from chamber 10, the gas of substitution gas introducing mechanism imports the operation of plate 49 as described above.
Further, mechanism for assembling-disassembling 70 has vibration absorber 75, because these vibration absorber 75 article on plasma body generating units 40, apply active force opening on its direction, so when rotating plasma generating unit 40, can make the power that supports plasma generating unit 40 reduce this part, maintenance activity is become easily, improve operating efficiency.
Second execution mode
Below we illustrate second execution mode of the present invention.
Fig. 9 is the skeleton diagram of the formation of the plasma processing apparatus relevant with second execution mode of the present invention.Plasma processing apparatus 100 ', the plasma processing apparatus 100 relevant with first execution mode is same, for example be used for plasma etching and remove operation, have at the impurity layer that comprises oxide-film of the natural oxide film that forms on the metal film that forms on the processed substrate and on the silicon wafer etc.: accommodate chamber 10 as the semiconductor wafer of processed substrate '; The wafer maintaining part 20 of chamber 10 ' interior maintenance semiconductor wafer '; With cover chamber 10 ' mode be provided with, wafer is implemented produce in the processing space S of plasma treatment the plasma generating unit 40 of plasma '; The gas that will be used to produce plasma import the gas introducing mechanism 50 of above-mentioned processing space S '; With gas supply mechanism 60 from the gas that is used to produce plasma to gas introducing mechanism 50 that supply with '.
Among them because chamber 10 ', wafer maintaining part 20 ' and its peripheral parts have and first execution mode same formation fully, so add identical label and omit explanation to them on the parts identical with Fig. 2.
Plasma generating unit 40 ' have bell jar 141, be wound on the coil 143 as antenna element in the outside of bell jar 141, to the high frequency electric source 144 of coil 143 supply high frequency power be arranged on electroconductive component 147 on the roof of bell jar 141 as opposite electrode.
Bell jar 141 is for example by quartz or Al
2O
3, AlN etc. the such dielectric substance of ceramic material form, present have side wall portion 141a cylindraceous, (radius R 1=1600mm～2200mm) and the forniciform bight 141c that is connected with top wall portion 141b with side wall portion 141a (the most footpaths domed shape of radius R 2=20mm～40mm) of the dome-type top wall portion 141b on it.The outside at the side wall portion 141a of the cylinder that forms this bell jar 141, in general horizontal direction, make the gap that has 5～10mm between coil and the coil, preferably 8mm with gap with the winding number above-mentioned coil 143 of reeling of regulation, for example the insulating material with fluororesin etc. supports and fixed coil 1 43.In illustrated embodiment, the winding number of coil 143 is 4 circles.Above-mentioned high frequency electric source 144 is connected with coil 143 through adaptation 145.High frequency electric source 144 has the frequency of 300kHz～60MHz.450kHz～13.56MHz preferably.And, by from high frequency electric source 144 to coil 143 supply high frequency power, in the processing space S of the inboard of bell jar 141, form induction field through the side wall portion 141a of the bell jar 141 that constitutes by dielectric substance.
Gas introducing mechanism 50 ' be arranged on chamber 10 ' and bell jar 141 between, have the gas that becomes ring-type and import parts 130.This gas imports parts 130 and constitutes ground connection by the conductive material of Al etc.Import in the parts 130 at gas, be formed with a plurality of gas squit holes 131 along inner circumferential surface.The gas flow path 132 of ring-type is set, from gas supply mechanism 60 ' again as described later with Ar gas, H in the inside that gas imports parts 130
2Gas etc. are supplied with this gas flow path 132, spray these gas through above-mentioned gas squit hole 131 to handling space S from this gas flow path 132.Gas squit hole 131 forms towards horizontal direction ground, will handle gas and supply with in the bell jar 141.Again, also can make gas squit hole 131 towards oblique upper to formation, the central portion in bell jar 141 is supplied with and is handled gas.
Gas supply mechanism 60 ' will be used for the gas importing processing space S of plasma treatment, for example same with the gas supply mechanism 60 of Fig. 2, have gas supply source, open and close valve and be used to control the mass flow controller (all do not illustrate in the drawings come) of flow, will stipulate that through gas pipe arrangement 161 gas supplies with above-mentioned gas importing parts 130.In addition, control the valve and the mass flow controller of each pipe arrangement by not shown controller.
The gas of using as plasma treatment can illustration Ar, Ne, He, can be respectively with their monomer.Again, also can be with any and the H among Ar, Ne, the He
2And with and with any and NF among Ar, Ne, the He
3And use.In these gases, same with the situation of Fig. 2, preferably Ar separately, Ar+H
2With the gas of wanting the corresponding suitable selection plasma treatment of etched target to use.
Above-mentioned electroconductive component 147 plays a part opposite electrode, and has the function of pushing bell jar 141, is formed through anodised aluminium, aluminium, stainless steel, titanium etc. by the surface.
Below, illustrate in greater detail bell jar 141.
In the present embodiment, in order to improve etched inner evenness by improving isoionic uniformity, the flatness of regulation bell jar 141 etc.
That is, form that (=D/H) value is 1.60～9.25 formation by the flat ratio K of the ratio D/H definition of the height H of the middle body of the inside diameter D of side wall portion 141 a of bell jar 141 and dome-type top wall portion 141b.
When flat ratio K can not improve inner evenness than 1.60 hours, when flat ratio K is bigger than 9.25, be difficult in fact reel in order to form the required coil of plasma 143.
Form that (=D/H1) value is 0.90～3.85 formation by the flat ratio K1 of the ratio D/H1 definition of the height H 1 middle body, that count of the inside diameter D of the side wall portion 141a cylindraceous of bell jar 141 and dome-type top wall portion 141b above pedestal 21 again.
When having this flat ratio, the result, the volume number of coil 143 is below 10 times, and hope is about 7～2 times, more preferably about 4～2 times.
The value of the value of the height H of above pedestal 21, counting 1 of the value of the height H of middle body this bell jar 141, dome-type top wall portion 141b, the middle body of dome-type top wall portion 141b and the inside diameter D of side wall portion 141a cylindraceous, as an example, be respectively H=98mm, H1=209mm and D=450mm, at this moment flat ratio K=4.59, flat ratio K1=2.15.
Again, when example of size relationship of other each unit of expression, in season the inter normal height of the circular top part of bell jar 141 be the height of the cylindrical portions may of H2, bell jar 2 be H3 (promptly, H=H2+H3), the thickness of gas importing parts 30 is H4, the height of (gas imports the mounting surfaces of parts 30) is H5 above the openend of chamber 1 above pedestal 11, when the height above pedestal 11 above gas importing parts 30 is H6, the size value of each unit, ratio, as follows as an example.
That is, ratio K2=H/H6 is about 0.55～1.50.Ratio K3=H2/H3 is below 2.1, preferably below 0.85, more preferably below 0.67.
Again, ratio K4=H2/ (H3+H6) is less than 0.75, preferably below 0.65, more preferably from about below 0.55.
Again, when H2 was about 29～74mm, H6+H3 was about 97～220mm.When H3 is about 35mm when above, H5+H4 is about 62～120mm.When H2 was about 29mm, H3 was about 35～100mm, and H5 preferably is about 22～72mm below 0～72mm.
By the bell jar 141 that forms with above such ratio, the outer peripheral portion bell jar 141 in, the high zone of plasma density is to the wafer W side shifting, and it is regional uniformly to enlarge plasma density.Therefore, the part that exists in wafer W forms uniform plasma, etched having good uniformity.Thereby, be effective for bigbore especially wafer (substrate).
Below, our explanation is by the work of treatment of the plasma processing apparatus 100 that constitutes like this ' carry out.
At first, the valve 37 that opens the sluices, with not shown transport arm with wafer W be transported into chamber 10 ' in, wafer W is sent on the outstanding wafer lift pins 31 of pedestal 21.Secondly, make 31 times general who has surrendered's wafer W of wafer lift pins be positioned in pedestal 21 above, shading ring 23 is descended.
After this, closed shutter valve 37, by 39 pairs of chambers 10 of exhaust apparatus ' and bell jar 141 in carry out the decompression state that exhaust reaches regulation, to for example Ar gas be ejected in the bell jar 141 from the gas squit hole 131 that gas imports parts 130 from the regulation gas of gas supply mechanism 60 ' supply at this decompression state.Meanwhile, generate the high frequency electric source 144 of usefulness by the high frequency electric source 25 used from bias voltage and plasma, respectively the high frequency power of 0～1000W and 500～3000W is supplied with electrode 24 and coil 143 in the pedestal 21, produce electric field between coil 143 and electroconductive component 147 etc., excitation imports the gas in the bell jar 141, the igniting plasma.Behind the igniting plasma, sense of movement induced current in bell jar 141 generates plasma continuously, removes the natural oxide film that forms by this plasma etching on wafer W, for example at silica that forms on the silicon or the metal oxide film that forms on metal film.At this moment, on pedestal 21, add bias voltage, wafer W is maintained on the set point of temperature by heater 28 by high frequency electric source 25.This temperature is 20～800 ℃, is preferably 20～200 ℃.
At this moment plasma density is 0.7～10 * 10
10Atoms/cm
3, be preferably 1～6 * 10
10Atoms/cm
3In this plasma,, for example remove silicon oxide layer (SiO by about 30 seconds processing
2) about 10nm.
So, for example improved the adhesiveness of the film that after this forms, reduced the effect of resistance value etc. by removing the impurity layer that comprises oxide of natural oxide film etc.
Here, in the situation of present embodiment, because making the flat ratio K of bell jar 141 as described above is 1.60～9.25 or to make flat ratio K1 be 0.90～3.85, so the plasma that forms in bell jar 141 forms in the mode of expanding equably along the whole surface of wafer W, because the peripheral part in bell jar 141, move to wafer side in the zone that plasma density is high, so by plasma the etch processes of wafer W is all carried out equably to the surface, has improved etched inner evenness.At this moment, by regulation R1=1600mm～2200mm, R2=20mm～40mm, particularly make R1 big, the cross sectional shape of bell jar 141 becomes near rectangular flat, and the plasma that forms in bell jar 141 forms in the mode of expanding equably along the whole surface of wafer W.So, by plasma the etch processes of wafer W is all carried out equably to the surface, improved etched inner evenness.
Figure 10 A is illustrated in the Ar of the Ar plasma in the bell jar in the situation of the high bell jar of existing height (height H is that 137mm, inside diameter D are that the winding number of 450mm, coil is 10 circles)
+The analog result of density distribution, Figure 10 B is illustrated in the Ar in the plasma in the bell jar 141 (height H is that 98mm, inside diameter D are that the winding number of 450mm, coil is 4 circles) of present embodiment
+The analog result of density distribution.
Compare from the existing situation with Figure 10 A, Figure 10 B of the present embodiment of flat pattern can see having the Ar that evenly expands at the in-plane of wafer W more
+Density distribution, also guaranteed to improve the etched inner evenness of plasma from this analog result to wafer W.
That is,, need on wafer face, be formed uniformly plasma (Ar in the zone in order to improve etched uniformity
+Ion concentration).Thereby,, preferably make wafer W be exposed to the Ar that is formed uniformly in order to form plasma zone uniformly
+In the zone of ion concentration.
That is, big but device becomes if form bell jar 141 then the plasma expansion extending transverselyly, again, because plasma density also reduces, the power that needs increases, so the cost of device increases.
In the situation of present embodiment, because make flat ratio K, the K1 of bell jar 141 and ratio K2～K4 and the optimizations such as height H 1 at the top in 141 from the mounting table top to bell jar, so can not cause the maximization of device and the increase of consumption of electric power, can enough low costs keep plasma density, improve uniformity.
Figure 11 is an example of height H 1 with the relation of etch uniformity of expression top plate portion in 141 from the mounting table top to bell jar.As illustrated among this Figure 11, be 210mm etch uniformity constant up to H1, but etch uniformity reduce a lot when surpassing 250mm.Therefore, in the situation of present embodiment, as mentioned above,, make H1=209mm, obtain good etch uniformity as an example.
In addition, in the present embodiment, cut down the coiling number of times of coil 143, the height of reduction bell jar 141 makes bell jar 141 flattenings, but the existing formation of chamber 10 ' intactly use.Its reason be because, usually, chamber 10 ', commonly design the mechanism of pedestal and gate valve etc. by processing unit with other film formation device etc., can reduce cost, and by in the processing unit of multiple film formation device and Etaching device etc., making and chamber being transported into the outside conveyer that transports wafer and the joint construction of load locking room and changing jointly, promptly, the standardization of the joint construction by chamber and outside conveyer and load locking room has become easily the multi-cavity chamberization that interconnects a plurality of processing unit.
In other words, if according to the plasma processing apparatus of present embodiment, then can be by intactly using existing chamber, one side suppress cost, and one side is not damaged with versatility, improves to the inner evenness in the plasma treatment of wafer.
In the plasma processing apparatus of present embodiment, as the gas introducing mechanism, use is preferred with the above-mentioned first execution mode identical mechanism.Figure 12 represents this formation.The plasma processing apparatus of this figure, the gas introducing mechanism 50 of replacement Fig. 9 ', with the gas introducing mechanism 50 of first execution mode.Other and Fig. 9 similarly constitute.
In addition, even if in the present embodiment, the mechanism for assembling-disassembling 70 same mechanism for assembling-disassembling of the setting and first execution mode also are preferred.
The 3rd execution mode
Below we illustrate the 3rd execution mode of the present invention.The feature of the 3rd execution mode is the mounting structure as the semiconductor wafer W of processed substrate.
Figure 13 is the summary sectional view of the semiconductor wafer mounting structure in the expression plasma processing apparatus relevant with the 3rd execution mode of the present invention.Can freely load onto in the present embodiment hood-like mask plate 170 is arranged on with unloading pedestal 21 above, constitute wafer maintaining part 20 ", mounting wafer W on the surface of this mask plate 170.Because semiconductor wafer mounting structure is identical with second execution mode with chamber rotation structure, so in Figure 13, additional identical label on the parts identical with Figure 10 of second execution mode simplifies explanation.
As the amplification sectional view of Figure 14 is illustrated, on mask plate 170, flatly, there is not step difference, same thickness forms the wafer mounting zone 170a that the back side with the wafer W of mounting joins and the neighboring area 170b in its outside (highly).
As an example, when the diameter of wafer W was 300mm, the external diameter of mask plate 170 as an example, was 352mm.
In pedestal 21 and mask plate 170, on the position corresponding with wafer mounting zone 170a, be provided with to insert to be common to with passing and support also the through hole 31b and the through hole 170c of the wafer lift pins 31 of 3 (only illustrating 2 among the figure) of lifting wafer W, by this through hole 31b and through hole 170c, the top of 31 pairs of mask plates 170 of wafer lift pins can be given prominence to or submerge.
As Figure 15 is illustrative, among the neighboring area 170b on mask plate 170, mode with the peripheral portion that surrounds wafer W, at the Zhou Fangxiang locator protrusions 171 of assortment a plurality of (in the situation in present embodiment being 6) equally spaced roughly, prevent to be positioned in the position deviation of the wafer W on the 170a of wafer mounting zone.As Figure 14 is illustrative, be 0.5～2mm so that be configured in the clearance G of the periphery of its inboard wafer W and each locator protrusions 171, wish mode for 1mm, set the diameter in the assortment zone of locator protrusions 171.
The size of this locator protrusions 171, the thickness of aspect ratio wafer W is low to be preferred, and height is below 0.775mm, and more preferably below 0.7mm, more preferably below 0.05～0.3mm, diameter is 0.2～5mm.The size of locator protrusions 171, as an example, diameter is 2.4mm, is 0.3mm highly, occupy the area on surface of the mask plate 170 of diameter 352mm can ignore ground little.That is, the neighboring area 170b on the surface of mask plate 170 has the identical height with wafer mounting zone 170a in fact, is smooth.
Among the wafer region mounting zone 170a on mask plate 170, carve from central division radially and establish air channel 172, the end of this air channel 172 is communicated with the through hole 170c and the through hole 31b that insert logical wafer lift pins 31.And when among the wafer region mounting zone 170a that wafer W is positioned on the mask plate 170, the atmosphere gas between the back side of wafer W and the mask plate 170 promptly is discharged to the rear side of pedestal 21 by air channel 172 and through hole 170c, through hole 31b.Therefore, can prevent that wafer W from becoming unsettled quick condition occurrence positions and departing from, can stablize and mounting operation fast.On the contrary, when by wafer lift pins 31 to upper process work, when wafer W is floated above mask plate 170, by through hole 31b, through hole 170c and air channel 172, the gas of pedestal 21 rear side flow into the rear side in wafer W, the rear side that can prevent wafer W becomes negative pressure and produces and hinder the absorption affinity of floating, and that realizes wafer W floats operation fast.
Here, because in the illustrative mask plate 170 of Figure 13～Figure 15, as mentioned above, there is not step difference, same thickness is formed flatly the wafer mounting zone 170a that the back side with the wafer W of mounting joins and the neighboring area 170b in its outside (highly), thus when forming plasma mask plate 170 (pedestal 21) above in distribution of impedance in wafer mounting zone 170a and the neighboring area 170b outside it, become uniform.Therefore, make plasma density distribution, homogenizing on wafer mounting zone 170a (surface of wafer W) and among the neighboring area 170b in its outside.Releasing is by the dispar processing difference of etching speed in the central part of wafer W and periphery that departing from of distribution of impedance etc. causes, improves the inner evenness of the plasma treatment of on whole of wafer W etch processes etc.
Figure 16 is illustrated in the situation of step difference of the position that is formed for positions wafer W among the wafer mounting zone 170a of mask plate 170, the height dimension Ts of this step difference (transverse axis: the dispersion NU of the value mm of unit) and the etching result (longitudinal axis: the % of unit, as the percentage of whole measurement results of the number of the measurement result that the scope from 1 σ is departed from, more little even more) curve chart.
As can seeing from this Figure 16, the value of Ts is more little, and etched scattered NU% is also more little, Ts=0 (that is, as present embodiment, suitable) with the smooth situation that does not have step difference of wafer mounting zone 170a and neighboring area 170b, scattered minimum, inner evenness is the best.
When as present embodiment, the wafer mounting structure that has mask plate 170 is applied to have 100 ' time of plasma processing apparatus with the flat bell jar 141 relevant with second execution mode of Figure 10, by with the effect that multiplies each other of the homogenizing of the plasma density distribution that produces by the flattening of this bell jar 141, can expect further to improve the effect of inner evenness.
Again, even if the coiling number of times that is applied to have coil 143 at the wafer mounting of the mask plate 170 that will have present embodiment structure in the situation of the existing plasma processing apparatus of the higher bell jar of the aspect ratio more than 7 times, the effect of the inner evenness that also can be improved.
In addition, more than Shuo Ming execution mode is in order to make technology contents of the present invention become very clear, can not to be interpreted as the present invention and only to be defined in this execution mode, in thought range of the present invention, can implementing all changes.
For example, represented to apply the present invention to remove the situation of the device of natural oxide film in the above-described embodiment, but the present invention also can be applied to carry out other plasma-etching apparatus of contact etch etc., further, also can apply the present invention to other plasma processing apparatus.Further, represented as handled object with the example of semiconductor wafer, but be not limited thereto, also can be applied to other handled object of LCD substrate etc.
Further, only otherwise depart from the scope of the present invention, suitably make up the inscape of above-mentioned execution mode, the inscape of perhaps removing a part of above-mentioned execution mode also all within the scope of the invention.
Claims (6)
1. a plasma processing apparatus carries out plasma treatment to processed substrate, it is characterized in that, this plasma processing unit possesses:
Accommodate the chamber of handled object;
Have in the mode that is communicated with chamber and be wound on the outer periphery of described bell jar with being arranged on the bell jar that constitutes by dielectric of described chamber top and coiled type and in described bell jar, form the antenna of induction field, make the plasma generating unit of plasma generation towards the inboard of described bell jar;
Be arranged between described plasma generating unit and the described chamber, the gas that plasma is formed usefulness imports the gas introducing mechanism in the processing space that is divided into by described plasma generating unit and described chamber;
Be arranged on the mounting table of the support handled object in the described chamber; With
The described mounting table of covering that constitutes by dielectric and the mask of the described handled object of mounting,
Described mask forms the first area of the described handled object of mounting and the second area on every side of described first area has the formation of equal height.
2. plasma processing apparatus according to claim 1 is characterized in that:
In described second area, be provided with a plurality of projections of the position that is used for making described handled object be positioned described first area.
3. plasma processing apparatus according to claim 1 is characterized in that:
In described first area, be provided with and make described handled object float a plurality of pin-and-holes that the lifter pin of usefulness connects and the groove pattern that is communicated with described pin-and-hole from described mounting table.
4. plasma processing apparatus according to claim 1 is characterized in that:
The flat ratio K that is represented by the ratio D/H of the inside diameter D of described bell jar and the inter normal height H of the central portion of described bell jar is 1.60～9.25.
5. plasma processing apparatus according to claim 1 is characterized in that:
Is 0.90～3.85 by the inside diameter D of described bell jar with the flat ratio K1 that ratio D/H1 from the top plate portion of the central portion of described bell jar to the distance H 1 of described mounting table represents.
6. plasma processing apparatus according to claim 1 is characterized in that:
Described bell jar present by radius R 1 for the top wall portion of 1600mm～2200mm, side wall portion cylindraceous, connect the most footpaths domed shape that the radius R 2 of described top wall portion and described side wall portion constitutes for the bight of 20mm～40mm.
Applications Claiming Priority (3)
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|---|---|---|---|
| JP2003127201 | 2003-05-02 | ||
| JP2003127201 | 2003-05-02 | ||
| JP2003180865 | 2003-06-25 |
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|---|---|---|---|
| CNB2004800010366A Division CN100350569C (en) | 2003-05-02 | 2004-04-28 | Process gas introducng mechanism and plasma processing device |
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| CN101123178A true CN101123178A (en) | 2008-02-13 |
| CN100508117C CN100508117C (en) | 2009-07-01 |
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| CNB2007101535704A Expired - Lifetime CN100508117C (en) | 2003-05-02 | 2004-04-28 | Plasma processing device |
| CNB2004800010366A Expired - Lifetime CN100350569C (en) | 2003-05-02 | 2004-04-28 | Process gas introducng mechanism and plasma processing device |
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- 2004-04-28 CN CNB2004800010366A patent/CN100350569C/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100508117C (en) | 2009-07-01 |
| CN101106070B (en) | 2012-01-11 |
| CN1701421A (en) | 2005-11-23 |
| CN100350569C (en) | 2007-11-21 |
| CN101106070A (en) | 2008-01-16 |
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