Abstract:
A fluid temperature control device, which is particularly suitably applied to the temperature control of a processing liquid in a semiconductor device manufacturing process, capable of performing quickly and precisely the temperature control of a temperature-controlled fluid, and the device can also be made as small as possible. This fluid temperature control device includes a body block having flow passage grooves formed therein; heat transfer plates which are disposed on surfaces of the body block to form flow passages where a temperature-controlled fluid flows; heaters which heat the temperature-controlled fluid flowing through the flow passages via at least one of the heat transfer plates; and thermoelectric modules which heat and cool the temperature-controlled fluid flowing through the flow passages via at least one of the heat transfer plates.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a fluid temperature control device, and more particularly to a structure of a fluid temperature control device which is suitably applied to temperature control of a processing liquid in a semiconductor device manufacturing process. 
         [0003]    2. Description of the Related Art 
         [0004]    For example, the semiconductor device manufacturing field adopts a fluid temperature control device which uses a thermoelectric module to heat/cool the processing liquid or a fluid temperature control device which uses a heater to heat the processing liquid for temperature control of the processing liquid in various manufacturing processes. 
         [0005]    For a case where a temperature of the processing liquid is controlled in a wide range or where the processing liquid is required to be heated quickly, there is provided a fluid temperature control device which is comprised of the above-described thermoelectric module and heater in combination (Japanese Patent application Laid-open No. 2006-269617, for example). 
         [0006]      FIG. 4  shows a substrate processing system which performs processes such as cleaning, etching and the like of a substrate such as a semiconductor wafer, a glass substrate or the like by immersing in a processing liquid, and this substrate processing system A has a processing tank T which accumulates the processing liquid and a piping S which connects an outer tank To and an inner tank Ti of the processing tank T. The piping S is provided with a pump P which circulates the processing liquid discharged from the outer tank To to the inner tank Ti, a fluid temperature control device B and a filter F. 
         [0007]    The fluid temperature control device B is comprised of an electronic cooling/heating unit U using a thermoelectric module and a heater H which are connected in series. A processing liquid (temperature-controlled fluid) L, which is sent from the outer tank To of the processing tank T to the fluid temperature control device B by the operation of the pump P as indicated by arrows a, b, c, is heated/cooled by the electronic cooling/heating unit U, then sent to the heater H as indicated by an arrow d and heated therein. The processing liquid L which is adjusted to a desired temperature by the operations of the electronic cooling/heating unit U and the heater H is circulated from the fluid temperature control device B to the inner tank Ti of the processing tank T through the filter F. 
         [0008]    The fluid temperature control device B of the above-described substrate processing system A is configured of the electronic cooling/heating unit U and the heater H which are independently disposed from each other and mutually connected through the pipe. Therefore, it is hard to adjust the temperature of the processing liquid (liquid temperature-controlled fluid) quickly and precisely, and an installation space is increased because an overall size becomes large, resulting in a problem of increasing the size of the substrate processing system A. 
         [0009]    Under the circumstances described above, the present invention provides a fluid temperature control device which can adjust a temperature of a temperature-controlled fluid quickly and precisely and which can also be made as small as possible. 
       SUMMARY OF THE INVENTION 
       [0010]    A first aspect of the invention provides a fluid temperature control device that includes a body block having flow passage grooves formed therein; heat transfer plates which are disposed on surfaces of the body block to form flow passages where a temperature-controlled fluid flows; heaters which heat the temperature-controlled fluid flowing through the flow passages via at least one of the heat transfer plates; and thermoelectric modules which heat and cool the temperature-controlled fluid flowing through the flow passages via at least one of the heat transfer plates. 
         [0011]    According to the fluid temperature control device of the first aspect of the invention, the temperature-controlled fluid is heated by the heaters via at least one of the heat transfer plate, and the temperature-controlled fluid is heated/cooled by the thermoelectric modules via at least one of the heat transfer plates. Therefore, it becomes possible to adjust the temperature of the temperature-controlled fluid quickly and precisely in comparison with the conventional fluid temperature control device which sends the temperature-controlled fluid heated/cooled by the electronic cooling/heating unit to the heater to heat it. 
         [0012]    According to the fluid temperature control device of the first aspect of the invention, the heaters, which heat the temperature-controlled fluid via the heat transfer plate disposed on the surface of the body block, and the thermoelectric modules, which heat/cool the temperature-controlled fluid via the heat transfer plate, are disposed within or in contact with the heat transfer plate. Therefore, the body block, the heat transfer plates, the heaters and thermoelectric modules are disposed very close to one another, and it becomes possible to make the fluid temperature control device as small as possible. 
         [0013]    A second aspect of the invention provides the fluid temperature control device according to the first aspect of the invention, wherein the heaters are disposed within at least one of the heat transfer plates, and the thermoelectric modules are disposed on an outer surface of at least one of the heat transfer plates. 
         [0014]    According to the fluid temperature control device of the second aspect of the invention, the heaters are disposed within the heat transfer plate, and the thermoelectric modules are disposed on the outer surface of the heat transfer plate. Therefore, to heat the temperature-controlled fluid in the flow passages by the heaters, the outer surface of the heat transfer plate is heated by the thermoelectric modules, the heat of the heaters is prevented from escaping from the outer surface of the heat transfer plate via the thermoelectric modules, and the temperature-controlled fluid in the flow passages can be heated efficiently. 
         [0015]    A third aspect of the invention provides the fluid temperature control device according to the second aspect of the invention, wherein the heating capabilities of the heaters upon the temperature-controlled fluid are set to be higher than those of the thermoelectric modules upon the temperature-controlled fluid. 
         [0016]    According to the fluid temperature control device of the third aspect of the invention, the heating capabilities of the heaters upon the temperature-controlled fluid are set to be higher than those of the thermoelectric modules upon the temperature-controlled fluid. Therefore, when the temperature-controlled fluid is heated by the heaters and the thermoelectric modules, the temperatures of the thermoelectric modules on the heating side can be suppressed to a low level, and the lives of the thermoelectric modules can be prevented from being decreased by a junction temperature. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1  is a schematic entire plan view showing an embodiment of the fluid temperature control device of the invention; 
           [0018]      FIG. 2  is a perspective view showing a temperature gradient of a flow passage block, a heat transfer plate, a thermoelectric conversion module and a cooling plate in the fluid temperature control device of  FIG. 1 ; 
           [0019]      FIG. 3  is a schematic entire plan view showing another embodiment of the fluid temperature control device of the invention; and 
           [0020]      FIG. 4  is a conceptual view showing a conventional fluid temperature control device. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0021]    The present invention is described in detail below with reference to the drawings showing embodiments. 
         [0022]      FIG. 1  shows an example of applying the fluid temperature control device of the invention to a fluid temperature control device for adjusting the temperature in a range of about of 10° C. to about 80° C. of a chemical solution (temperature-controlled fluid) used in a semiconductor device manufacturing process, and specifically an acid chemical solution such as an ammonia/hydrogen peroxide solution, a hydrochloric acid/hydrogen peroxide solution or the like which is used for a wet process (RCA cleaning), wet etching or the like. The above-described fluid temperature control device  1  has a body block  2  where the chemical solution is fed/discharged and a heat transfer plate  3  which is placed on each surface  2   a  of the body block  2 . Heaters  4  are disposed within the heat transfer plates  3 , a Peltier module (thermoelectric module)  5  is attached to an outer surface of the each heat transfer plate  3 , and a water jacket  6  is attached to the each Peltier module  5  to perform heat radiation removal/heat supply of the Peltier module  5 . 
         [0023]    A flow passage  2 P is formed between the body block  2  and the heat transfer plate  3 , and the chemical solution flowing through the flow passage  2 P comes into contact with the heat transfer plate  3 . Thus, heat exchange is performed among the heater  4 , the Peltier module  5  and the chemical solution via the heat transfer plate  3  to adjust the temperature of the chemical solution. 
         [0024]    The body block  2  is formed of a resin material such as Teflon (registered trade name) or the like which has corrosion resistance to the chemical solution, the right and left surfaces  2   a,    2   a  are provided with flow passage grooves  2   g,    2   g,  and the body block  2  is provided with a feed pipe  21  and a discharge pipe  20  which are communicated with the flow passage grooves  2   g,    2   g.    
         [0025]    Meanwhile, the heat transfer plate  3  which is attached to the surface  2   a  of the body block  2  is a flat-shaped block formed of a metal material such as aluminum having a good thermal conductivity, and a corrosion-resisting plate  3 P which corresponds to the entire area of the flow passage groove  2   g  is fixed to the surface opposite to the body block  2 . 
         [0026]    Incidentally, the corrosion-resisting plate  3 P is formed of amorphous carbon which has corrosion resistance against a chemical solution and a good thermal conductivity. 
         [0027]    The heat transfer plates  3  each are attached to the right and left surfaces  2   a,    2   a  of the body block  2 , and the pair of heat transfer plates  3 ,  3  are fixed to prescribed positions of the body block  2  in such a manner to hold the both sides of the body block  2  by mutually fixing by means of unshown bolts, nuts and springs. 
         [0028]    As described above, the heat transfer plates  3  are disposed on the surfaces  2   a  of the body block  2  to cover the flow passage grooves  2   g  of the body block  2  with the heat transfer plates  3  (corrosion-resisting plates  3 P). Thus, the each flow passage  2 P is formed between the body block  2  and the heat transfer plate  3 . 
         [0029]    Three heaters  4  are disposed within the heat transfer plates  3 , the Peltier module  5  is held on the outer surface of the each heat transfer plate  3  so to be sandwiched between the heat transfer plate  3  and the water jacket  6  as described above, and the Peltier module  5  is thermally connected to the heat transfer plate  3  and the water jacket  6  via an insulating layer (not shown). 
         [0030]    Here, the three heaters  4  are disposed within the heat transfer plates  3  to uniformize a temperature distribution on the heat transfer plates  3 , and a heating value (heating capability) of the heater  4  disposed in the each heat transfer plate  3 , more specifically a total heating value of the three heaters  4 , is set to be larger than a heating value (heating capability) of the Peltier module  5  which is in contact with the heat transfer plate  3 . 
         [0031]    In the above-configured fluid temperature control device  1 , the chemical solution, which is introduced into the feed pipe  21  as indicated by an arrow i and flown into the flow passage  2 P, is flown through the flow passage  2 P in contact with the heat transfer plate  3  (the corrosion-resisting plate  3 P), adjusted its temperature by heat conduction from the heat transfer plate  3  whose temperature is adjusted by heating by the heaters  4  and heating/cooling by the Peltier module  5 , and discharged out of the device as indicated by an arrow o from the flow passage  2 P through the discharge pipe  20 . 
         [0032]    To increase the temperature of the chemical solution by the fluid temperature control device  1 , an electric current is passed to the heaters  4  to heat the heat transfer plate  3  such that the side of the Peltier module  5  in contact with the heat transfer plate  3  radiates heat and its side in contact with the water jacket  6  absorbs heat. 
         [0033]    Meanwhile, to decrease the temperature of the chemical solution by the fluid temperature control device  1 , the electric current to the heaters  4  is cut off to stop heating of the heat transfer plate  3  by the heaters  4 , and the heat transfer plate  3  is cooled by electrifying such that the side of the heat transfer plate  3  in contact with the Peltier module  5  absorbs heat and its side in contact with the water jacket  6  generates heat. 
         [0034]    Incidentally, it is needless to mention that the temperature of the chemical solution is measured by a sensor (not shown), and the operations of the heaters  4  and the Peltier modules  5  are controlled by an unshown controller so that its temperature becomes a desired temperature. 
         [0035]    Since the Peltier module  5  has a characteristic that its life is shortened at a particular temperature or more, it is effective that the temperature of the outer surface (the surface in contact with the Peltier module  5 ) of the heat transfer plate  3  is measured by the sensor (not shown), and the operations of the heaters  4  and the Peltier module  5  are controlled so that the temperature of the heat transfer plate  3  becomes a temperature or lower not to affect on the Peltier module  5 . 
         [0036]    According to the above-configured fluid temperature control device  1 , the chemical solution is heated by the heaters  4  via the heat transfer plate  3  which faces the flow passage  2 P and also heated/cooled by the Peltier module  4  via the heat transfer plate  3 , so that the temperature of the chemical solution can be adjusted quickly and precisely in comparison with the conventional fluid temperature control device (see  FIG. 4 ) which sends the temperature-controlled fluid heated/cooled by the electronic cooling/heating unit to the heater to heat it. 
         [0037]    According to the above-configured fluid temperature control device  1 , the heaters  4  for heating the chemical solution via the heat transfer plate  3  which is disposed on the surface  2   a  of the body block  2  are disposed within the heat transfer plate  3 , and the Peltier module  5  which heats/cools the chemical solution via the heat transfer plate  3  is disposed in contact with the heat transfer plate  3 . Therefore, the body block  2 , the heat transfer plate  3 , the heaters  4  and the Peltier module  5  are disposed very close to one another, and the fluid temperature control device  1  can be made as small as possible. 
         [0038]    According to the above-configured fluid temperature control device  1 , the heaters  4  are disposed within the heat transfer plate  3  which faces the flow passage  2 P, and the Peltier module  5  is disposed on the outer surface of the heat transfer plate  3 . Therefore, to heat the chemical solution which flows through the flow passage  2 P, the heat transfer plate  3  is heated by the heaters  4  and the Peltier module  5  as described above, and a temperature gradient among the body block  2 , the heat transfer plate  3  and the Peltier module  5  becomes as indicated by a solid line in  FIG. 2 . 
         [0039]    In other words, an interface between the heat transfer plate  3  and the Peltier module  5  has a maximum temperature point ta, and the heat quantity of the heaters  4  is not absorbed by cooling water within the water jacket  5  via the Peltier module  5 . Thus, the chemical solution L in the flow passage  2 P is heated efficiently by the heat quantity from the heaters  4  via the heat transfer plate  3 . 
         [0040]    According to the above-configured fluid temperature control device  1 , the heating capabilities of the heaters  4  upon the chemical solution are set to be higher than those of the Peltier modules  5  upon the chemical solution. Thus, when the chemical solution is heated by the heaters  4  and the Peltier modules  5 , the temperatures of the Peltier modules  5  on the heating side can be suppressed to a low level. 
         [0041]    For example, even if the heaters  4  and the Peltier modules  5  have the same total heating value of 2 kw, the temperature on the heating side of the Peltier module  5  increases to 110° C. when it is set that the heating capability of the heaters  4  is 1 kw and the heating capability of the Peltier modules  5  is 1 kw, and the temperature on the heating side of the Peltier module  5  is suppressed to 100° C. when it is set that the heating capability of the heaters is 41.2 kw and the heating capability of the Peltier module  5  is 0.8 kw. 
         [0042]    Thus, since the heating capability of the heater  4  is set to be higher than that of the Peltier module  5 , the temperature on the heating side of the Peltier module  5  is suppressed to a low level, and the life of the thermoelectric module can be prevented from decreasing because of an unexpected increase in junction temperature. 
         [0043]    To increase the temperature of the chemical solution by the above-described fluid temperature control device  1 , the heat transfer plates  3  are heated by the heaters  4  and the Peltier modules  5  as described above, but when the chemical solution reaches a desired temperature, the electric current to the heaters  4  is cut off, and the temperature of the chemical solution is adjusted by only the Peltier modules  5 . 
         [0044]    Here, if the temperature of the chemical solution is decreased by external disturbances and its change amount is less than 1° C., the temperature is adjusted by only the Peltier modules  5 , and if the change amount is 1° C. or more and 10° C. or less, it is desirable to adjust the temperature by the Peltier modules  5  and the heaters  4 . 
         [0045]    The above-described fluid temperature control device I has the heat transfer plate  3  (heaters  4 ), the Peltier module  5  and the water jacket on either side of the body block  2 . But it is needless to say that the fluid temperature control device may be configured by forming the flow passage groove  2   g  in one surface  2   a  of the body block  2  and disposing the heat transfer plate  3  (heaters  4 ), the Peltier module  5  and the water jacket on the surface  2   a  only. 
         [0046]      FIG. 3  shows another embodiment of the fluid temperature control device according to the invention, and the fluid temperature control device  10  has a body block  12  where a chemical solution is fed/discharged, a heat transfer plate  13 A which is placed on one surface  12   a  of the body block  12  and a heat transfer plate  13 B which is placed on another surface  12   a  of the body block  12 . 
         [0047]    Three heaters  14  are disposed within the heat transfer plate  13 A, a Peltier module (thermoelectric module)  15  is attached to an outer surface of the heat transfer plate  13 B, and a water jacket  16  which performs heat radiation removal/heat supply of the Peltier module  15  is attached to an outer surface of the Peltier module  15 . 
         [0048]    A flow passage  12 P is formed between the body block  12  and the heat transfer plates  13 A,  13 B, the chemical solution which flows through the flow passage  12 P comes into contact with the heat transfer plates  13 A,  13 B, and heat exchange is performed between the heaters  14  and the Peltier module  15  and the chemical solution via the heat transfer plates  13 A,  13 B. Thus, the temperature of the chemical solution is adjusted. 
         [0049]    The fluid temperature control device  10  is basically configured in the same manner as the fluid temperature control device  1  shown in  FIG. 1  except that the heat transfer plate  13 A having the heaters  14  therein is disposed on one of the surfaces  12   a  of the body block  12 , and the heat transfer plate  13 B provided with the Peltier module  15  and the water jacket  16  is disposed on the other surface  12   a  of the body block  12 . Therefore, the component elements of the fluid temperature control device  10 , which function in the same manner as those of the fluid temperature control device  1 , are denoted by like reference numerals (in the 10s) with 10 added to the reference numerals of  FIG. 1  and detailed descriptions thereof are omitted. 
         [0050]    According to the above-configured fluid temperature control device  10 , the chemical solution is heated by the heaters  14  via the heat transfer plate  13 A which faces one of the flow passages  12 P, and the chemical solution is heated/cooled by the Peltier module  15  via the heat transfer plate  13 B which faces the other flow passage  12 P. Therefore, it becomes possible to adjust the temperature of the chemical solution quickly and precisely in comparison with the conventional fluid temperature control device which sends the temperature-controlled fluid, which is heated/cooled by the electronic cooling/heating unit, to the heater to heat it (see  FIG. 4 ). 
         [0051]    According to the above-configured fluid temperature control device  10 , the heaters  14  which heat the chemical solution via the heat transfer plate  13 A, which is disposed on the surface  12   a  of the body block  12 , are disposed within the heat transfer plate  13 A, and the Peltier module  15  which heats/cools the chemical solution via the heat transfer plate  13 B is disposed in contact with the heat transfer plate  13 B. Therefore, the body block  12 , the heat transfer plates  13 A,  13 B, the heaters  14  and the Peltier module  15  are disposed very close to one another, and the fluid temperature control device  10  can be made as small as possible. 
         [0052]    Here, the above-described fluid temperature control device  10  has the heat transfer plate  13 A, which has the heaters  14  therein and is disposed on one of the surfaces  12   a  of the body block  12 , and the heat transfer plate  13 B which is provided with the Peltier module  15  and the water jacket  16  and disposed on the other surface  12   a  of the body block  12 . But, it is also possible to symmetrically dispose the body block  12 , the heat transfer plate  13 B, the Peltier module  15  and the water jacket  16  on both sides of the heat transfer plate  13 A to configure the fluid temperature control device. 
         [0053]    According to the above-configured fluid temperature control device, the chemical solution in the right and left flow passages  12 P,  12 P which have the heat transfer plate  13 A therebetween can be heated efficiently by the heat generation of the heaters  14 . And, the heat generated by the heaters  14  is not radiated to one side (the right side in the drawing) of the heat transfer plate  13 A, and it is not necessary to take a heat insulation treatment. Thus, the structure can be made simple. 
         [0054]    In the above-described embodiments were described examples of applying the fluid temperature control device of the invention to the temperature adjustment of the chemical solution which is used in the wet process (RCA cleaning), wet etching or the like related to the manufacturing of the semiconductor device. And, it is a matter of course that the fluid temperature control device of the invention can be also applied effectively to the temperature control of the chemical solution in various manufacturing processes. 
         [0055]    The examples of applying the present invention to the semiconductor device manufacturing field were described in the above-described embodiments, but it is needless to say that the fluid temperature control device of the invention can be applied effectively to various facilities in various types of industrial fields requiring precise temperature adjustment.