Abstract:
The present invention is a film forming method of forming a film of a treatment solution on the front face of a substrate in a treatment chamber including the steps of: supplying the treatment solution to the substrate mounted on a holding member in the treatment chamber in states of gas being supplied into the treatment chamber and of an atmosphere in the treatment chamber being exhausted; and measuring the temperature of the front face of the substrate before the supply of the treatment solution. The measurement of the temperature of the front face of the substrate before the supply of the treatment solution enables the check of the temperature of the front face of the substrate and the temperature distribution. Then, the measured result is compared with a previously obtained ideal temperature distribution for the formation of a film with a uniform thickness, thereby predicting the film thickness of the film which will be formed in the following processing. Further, the treatment film is formed after the temperature measurement and the film thickness of the treatment film is evaluated, thereby storing the data to find and set so-called optimal conditions. Consequently, the temperature or the like of the treatment solution or the like can be adjusted based on the measured results and corrected to make the film thickness uniform.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a film forming method and a film forming apparatus for a substrate. 
     2. Description of the Related Art 
     In a photolithography process in the semiconductor device fabrication processes, for example, a resist coating treatment in which a resist solution is applied to the front of a wafer to form a resist film, exposure processing in which the wafer is exposed in a pattern, a developing treatment in which development is performed for the exposed wafer, and the like are performed to form a predetermined circuit pattern on the wafer. 
     In this event, in the resist coating treatment and the developing treatment, a film forming step is performed in which a treatment solution is supplied onto the wafer to thereby form a film of the treatment solution on the wafer. For example, in the resist coating treatment, the wafer is rotated at a predetermined speed with being suction-held by a spin chuck, and the resist solution is supplied to the center of the rotated wafer, whereby the resist solution is diffused to form the resist film on the wafer. 
     In order to improve yields of the wafer, it is necessary to uniformly form the resist film to a predetermined thickness. The important factors for the formation are the temperature of the resist film and the humidity of an atmosphere therearound. In other words, the thickness of the resist film is influenced by the temperature of the resist solution and the humidity of the atmosphere therearound, and thus, for example, when the temperature of the resist solution is high, the resist solution vaporizes, and the film thickness correspondingly decreases. Accordingly, the temperature distribution of the resist solution on the wafer W is kept within a predetermined range, thereby improving the uniformity in thickness of the resist film. 
     The resist coating unit in which the aforementioned resist coating treatment, however, is not provided with a measuring device for measuring the temperature of the wafer, and thus the temperature is not been measured. When the thickness of the resist film is corrected to be uniform, an adequate temperature distribution or the like during the coating is estimated from unevenness in line width of the circuit pattern which is finally formed on the wafer to adjust the temperature and the atmosphere in the resist coating unit. As a result, it takes a long time and a great deal of labor to obtain conditions of the temperature distribution for a uniform film thickness, and, further, accuracy is not necessarily high. 
     SUMMARY OF THE INVENTION 
     The present invention is made in the viewpoints, and its object is to provide a film forming method of measuring a temperature of a substrate such as a wafer or the like and adjusting the temperature of the substrate and a humidity of an atmosphere therearound based on the result to thereby uniform the film thickness of a treatment solution and a film forming apparatus for carrying out the method. 
     To attain the above-described object, according to the first aspect of the present invention, the forming method of the present invention is a film forming method of forming a film of a treatment solution on a front face of a substrate in a treatment chamber, including the steps of: supplying the treatment solution to the substrate mounted on a holding member in the treatment chamber in states of gas being supplied into the treatment chamber and of an atmosphere in the treatment chamber being exhausted; and measuring a temperature of the front face of the substrate before the supply of the treatment solution. 
     According to the second aspect of the present invention, the forming method of the present invention is a film forming method of forming a film of a treatment solution on a front face of a substrate in a treatment chamber, including the steps of: supplying the treatment solution to the substrate mounted on a holding member in the treatment chamber in states of gas being supplied into the treatment chamber and of an atmosphere in the treatment chamber being exhausted; and measuring a temperature of the holding member before the supply of the treatment solution. 
     Further, the film forming apparatus of the present invention is a film forming apparatus for supplying a treatment solution to a substrate mounted on a holding member in a treatment chamber to form a film of the treatment solution on a front face of the substrate, including: a non-contact temperature measuring device for measuring at least a temperature of the front face of the substrate or the holding member. 
     In accordance with a result of measuring the temperature of the front face of the substrate or the temperature of the holding member, for example, the temperature of the holding member may be changed, the supply condition of the gas to the treatment chamber may be changed, the quantity of exhaust from the treatment chamber may be changed, or the supply position of the solvent vapor of the treatment solution to the substrate may be controlled. When the holding member is rotated, the rotational speed may be changed. 
     The measurement of the temperature of the front face of the substrate before the supply of the treatment solution enables the check of the temperature of the front face of the substrate and the temperature distribution. Then, the measured result is compared with a previously obtained ideal temperature distribution for the formation of a film with a uniform thickness, thereby predicting the film thickness of the film which will be formed in the following processing. Further, the treatment film is formed after the temperature measurement and the film thickness of the treatment film is evaluated, thereby storing the data to find and set optimal conditions. Consequently, the temperature or the like of the treatment solution or the like can be adjusted based on the measured results and corrected to make the film thickness uniform. 
     It is found that the temperature of the treatment solution to be supplied onto the substrate is influenced not only by the temperature of the substrate but also by the temperature of the holding member holding the substrate. The holding member of this kind in particular is often provided with a drive mechanism such as a motor and thus it is prone to accumulate heat from the motor. Accordingly, it is useful to measure the temperature of the holding member before the supply of the treatment solution to check the temperature of the holding member for the determination whether or not a uniform film will be formed. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a plan view showing an appearance of the configuration of a coating and developing system in which a resist coating unit according to a first embodiment is installed; 
     FIG. 2 is a front view of the coating and developing system in FIG. 1; 
     FIG. 3 is a rear view of the coating and developing system in FIG. 1; 
     FIG. 4 is an explanatory view of a vertical cross section of a resist coating unit according to the embodiment; 
     FIG. 5 is an explanatory view of a vertical cross section of a gas supply means in the resist coating unit shown in FIG. 4; 
     FIG. 6 is an explanatory view of a horizontal cross section of the gas supply means shown in FIG. 5; 
     FIG. 7 is an explanatory view showing an example a measured temperature distribution on a wafer and an ideal temperature distribution; 
     FIG. 8 is an explanatory view showing a state in which gas is supplied from the gas supply means in FIG. 4 onto the wafer; 
     FIG. 9 is an explanatory view of a vertical cross section of a resist coating unit according to a second embodiment; 
     FIG. 10 is an explanatory view of a vertical cross section of a resist coating unit according to a third embodiment; 
     FIG. 11 is an explanatory view of a vertical cross section of a resist coating unit according to a fourth embodiment; and 
     FIG. 12 is an explanatory view of a vertical cross section showing an example of a resist coating unit according to the embodiment in a case in which the temperature of an upper face of a spin chuck is measured. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a plan view of a coating and developing system  1  including a resist coating unit according to this embodiment, FIG. 2 is a front view of the coating and developing system  1 , and FIG. 3 is a rear view of the coating and developing system  1 . 
     The coating and developing system  1  has a configuration, as shown in FIG. 1, in which a cassette station  2  for carrying, for example, 25 wafers W in a cassette, as a unit, from/to the outside into/out of the coating and developing system  1  and carrying the wafer W into/out of a cassette C, a processing station  3  in which various kinds of processing and treatment units each for performing predetermined processing or treatment for the wafers W one by one in coating and developing steps are multi-tiered, and an interface section  4  for delivering the wafer W to/from an aligner; not shown, provided adjacent to the processing station  3  are integrally connected. 
     In the cassette station  2 , a plurality of cassettes C can be mounted at predetermined positions on a cassette mounting table  5  which is a mounting portion in a line in an X-direction (a vertical direction in FIG.  1 ). A wafer carrier  7  transportable in the direction of arrangement of the cassettes (the X-direction) and in the direction of arrangement of the wafers W housed in the cassette C (a Z-direction; a vertical direction) is provided to be movable along a carrier guide  8  so as to selectively get access to each cassette C. 
     The wafer carrier  7  has an alignment function of aligning the wafer W. The wafer carrier  7  is configured to get access also to an extension unit  32  included in a third processing unit group G 3  on the processing station  3  side as described later. 
     In the processing station  3 , a main carrier unit  13  is provided at the central portion thereof, and various kinds of processing and treatment units are multi-tiered around the main carrier unit  13  to form processing unit groups. In the coating and developing system  1 , four processing unit groups G 1 , G 2 , G 3 , and G 4  are arranged, the first and second processing unit groups G 1  and G 2  are disposed on the front side of the coating and developing system  1 , the third processing unit group G 3  is disposed adjacent to the cassette station  2 , and the fourth processing unit group G 4  is disposed adjacent to the interface section  4 . Further, a fifth processing unit group G 5  shown by a broken line can be additionally disposed on the rear side as an option. The main carrier  13  can carry in/out the wafer W to/from the various kinds of processing and treatment units described later arranged in the processing unit groups G 1  to G 5 . 
     In the first processing unit group G 1 , for example, as shown in FIG. 2, a resist coating unit  17  as a film forming apparatus according to this embodiment and a developing unit  18  for supplying a developing solution to the wafer W to thereby treat it are two-tiered in order from the bottom. In the second processing unit group G 2 , a resist coating unit  19  and a developing unit  20  are similarly two-tiered in order from the bottom. 
     In the third processing unit group G 3 , for example, as shown in FIG. 3, a cooling unit  30  for cooling the wafer W, an adhesion unit  31  for enhancing fixedness between the resist solution and the wafer W, an extension unit  32  for allowing the wafer to wait therein, pre-baking units  33  and  34  each for evaporating a solvent in the resist solution, post-baking units  35  and  36  each for performing heat treatment after the developing treatment, and the like are, for example, seven-tiered in order from the bottom. 
     In the fourth processing unit group G 4 , for example, a cooling unit  40 , an extension and cooling unit  41  for allowing the wafer W mounted thereon to cool by itself, an extension unit  42 , a cooling unit  43 , post-exposure baking units  44  and  45  each for performing heat treatment after exposure processing, post-baking units  46  and  47 , and the like are, for example, eight-tiered in order from the bottom. 
     A wafer carrier  50  is provided at the canter of the interface section  4 . The wafer carrier  50  is configured to be movable in the X-direction (the vertical direction in FIG. 1) and in the Z-direction (the vertical direction) and rotatable in a θ-direction (a direction of rotation around a Z-axis) so as to get access to the extension and cooling unit  41  and the extension unit  42  included in the fourth processing unit group G 4 , a peripheral aligner  51 , and the not shown aligner. 
     The configuration of the aforementioned resist coating unit  17  will be explained. As shown in FIG. 4, a spin chuck  60  having an upper face  60   a  in circular and flat form and a not shown suction port at the center is provided in a casing  17   a  of the resist coating unit  17  such that the wafer W carried into the resist coating unit  17  is horizontally suction-held on the upper face  60   a  of the spin chuck  60 . A rotary drive mechanism  62  for rotating the spin chuck  60  and capable of changing its rotational speed is provided below the spin chuck  60  to rotate the wafer W held on the spin chuck  60  at an optional speed. 
     The rotary drive mechanism  62  of the spin chuck  60 , having a function of freely moving the spin chuck  60  up and down, moves the spin chuck  60  up and down when the wafer W is carried in/out to deliver the wafer W to/from the main carrier  13 . 
     An annular cup  65  with an upper face opened is provided outside the outer periphery of the spin chuck  60  to surround the outer periphery so as to receive the resist solution and the like dropping by centrifugal force off the wafer W which is suction-held on the spin chuck  60  and rotated, thereby preventing the units therearound from being contaminated. A drain pipe  66  for draining the resist solution and the like dropping off the wafer W and the like is provided at the bottom of the cup  65 . 
     A discharge nozzle  68  for discharging the resist solution to the wafer W and a solvent discharge nozzle  69  for discharging a solvent of the resist solution to the wafer W are provided above the spin chuck  60 . The discharge nozzle  68  is movable to a position above the center of the wafer W. Accordingly, the resist solution is discharged from the discharge nozzle  68  to the center of the wafer W which is being rotated by the above-described rotary drive mechanism  62 , so that a predetermined resist film is formed on the wafer W by a so-called spin coating method. 
     A gas supply means  70  for supplying a treatment chamber S with a predetermined gas, for example, clean air to thereby control an atmosphere in the treatment chamber S is provided at the upper face of the casing  17   a . The gas supply means  70  is formed to be almost cylindrical as a whole, and its upper face is provided with a main supply port  72  for allowing the clean air from the outside of the casing  17   a  to flow thereinto. 
     As shown in FIG.  4  and FIG. 5, diffuser panels  74  for diffusing the clean air from the main supply port  72  are horizontally provided in the gas supply means  70 . Further, on the wafer W side of the diffuser panels  74 , a plurality of temperature adjusting chambers  75   a ,  75   b  and  75   c  are provided to which the clean air passing through the diffuser panels  74  is distributed and individually adjusted in temperature. The temperature adjusting chambers  75   a ,  75   b  and  75   c , as shown in FIG. 6, are concentrically divided and opposed to the position of the wafer W located thereunder. Further, as shown in FIG. 4, heating and cooling means  76   a ,  76   b  and  76   c  such as Peltier elements are provided in the temperature adjusting chambers  75   a ,  75   b  and  75   c  respectively to change temperatures in the temperature adjusting chambers  75   a ,  75   b  and  75   c , and by extension, to be able to change temperature of the clean air within each chamber. Incidentally, the temperatures of the heating and cooling means  76   a ,  76   b  and  76   c  are controlled by a temperature controller  77 . Furthermore, a plurality of supply ports  78  are provided at the lower faces of the temperature adjusting chambers  75   a ,  75   b  and  75   c , that is, at the lower face of the gas supply means, and formed so as to jet toward the upper face of the wafer W the clean air which is temperature-adjusted in each of the temperature adjusting chambers  75   a ,  75   b  and  75   c . It should be noted that an inert gas such as nitrogen gas or the like may be used as a gas for controlling the atmosphere in the treatment chamber S. 
     An exhaust port  80  for exhausting the atmosphere in the treatment chamber S is provided at the side face of the casing  17   a . The atmosphere in the treatment chamber S is exhausted from the exhaust port  80  by suction of a suction device  81 . 
     A thermo viewer  85  which is a thermal infrared measuring device for measuring by infrared rays the temperature of the wafer W which is an object to be measured is installed outside and at the side of the casing  17   a  so as to indirectly measure the temperature of the wafer W via a reflector  87  which is provided at a preferable position of the casing  17   a . A measured result of the thermo viewer  85  is sent to the aforementioned temperature controller  77 , and, further, the temperature controller  77  is configured to individually control the temperatures of the temperature adjusting chambers  75   a ,  75   b  and  75   c  based on the received data. 
     The operation of the resist coating unit  17  structured as described above will be explained next with the photolithography process which is performed in the coating and developing system  1 . 
     First, one unprocessed wafer W is taken out of the cassette C by the wafer carrier  7  and carried into the adhesion unit  31  included in the third processing unit group G 3 , where, for example, HMDS which enhances the adhesion of the resist solution is applied to the front face of the wafer W. Then, the wafer W is carried by the main carrier unit  13  to the cooling unit  30  and cooled to a predetermined temperature. Thereafter, the wafer W is carried to the resist coating unit  17  or  19  as the film forming unit. 
     The wafer W which is formed with a resist film in the resist coating unit  17  or  19  is carried by the main carrier unit  13  to the pre-baking unit  33  or  34  and the cooling unit  40  in sequence. Thereafter, the wafer W is subjected to predetermined processing such as exposure processing, developing treatment and the like in the processing units, thereby completing a series of coating and developing treatments. 
     The operation of the above-described resist coating unit  17  will be explained in detail. First, the inside of the treatment chamber S is adjusted to a predetermined atmosphere and maintained by a gas, for example, clean air, maintained at a predetermined temperature, for example, 23° C. which is supplied from the gas supply means  70 . In this event, the atmosphere in the treatment chamber S is being exhausted at any time from the exhaust port  80 , whereby a flow of the clean air flowing from the gas supply means  70  toward the exhaust port  80  is formed in the treatment chamber S. 
     When the coating treatment of the resist solution is started, the wafer W for which previous processing has been completed is carried into the treatment chamber S by the main carrier unit  13  and stopped at a predetermined position above the spin chuck  60 . Then, the main carrier unit  13  descends with holding the wafer W, and the wafer W is mounted on the spin chuck  60  which has previously ascended by the rotary drive mechanism  62  and waited and then suction-held by the spin chuck  60 . Then, the spin chuck  60  descends and stops at a predetermined position in the cup  65 . 
     Subsequently, the temperature of the entire front face of the wafer W is measured by the thermo viewer  85 . Then, the measured data is compared with a data, for example, a temperature distribution on the wafer W as shown in FIG. 7, which has been previously obtained to form a uniform resist film over the wafer W. When there is a portion of which the measured temperature deviates from an allowable range (a diagonally shaded range in FIG. 7) with respect to an ideal temperature distribution, the data is sent to the temperature controller  77 . 
     Thereafter, the coating treatment of the resist solution to the wafer W is started by the aforementioned so-called spin coating method. At the same time, the temperature of the temperature adjusting chamber  75  which is opposed to the deviating portion of the wafer W is adjusted based on the data which has been previously sent to the temperature controller  77 , thereby adjusting the temperature of the clean air passing through the aforesaid temperature adjusting chamber  75 , and, further, the clean air is supplied to the deviating portion of the wafer W, thereby correcting the temperature of the deviating portion on the wafer W. 
     For example, when the temperature of the outer peripheral portion of the wafer W is low as shown in FIG. 7, the temperature controller  77  raises the temperature in the temperature adjusting chamber  75   c  which supplies the clean air toward the outer peripheral portion of the wafer W by, for example, 2° C. This raises the temperature of the clean air passing through the temperature adjusting chamber  75   c , and when the clean air is supplied from the supply ports  78  to the peripheral portion of the wafer W as shown in FIG. 8, the temperature of the peripheral portion of the wafer W rises, correcting the temperature distribution on the wafer W. 
     The wafer W on the spin chuck  60  is rotated rapidly, at a predetermined speed, for example, 2000 rpm by the rotary drive mechanism  62  while nitrogen gas for correcting the temperature on the wafer W is being supplied. The solvent discharge nozzle  69  located above the center of the wafer W first supplies a predetermined solvent to apply the solvent onto the front face of the wafer W. Then, the discharge nozzle  68  discharges the resist solution, and the resist solution is diffused over the front face of the wafer W by rotation of the wafer W. Thereafter, the rotation speed is increased, for example, to 3500 rpm, thereby shaking off an excessive resist solution to form a resist film with a predetermined thickness and a uniform thickness on the wafer W. Finally, the rotation of the wafer W is stopped, completing the resist coating treatment of forming the resist film on the wafer W. It should be noted that concurrently with the stop of the rotation of the wafer W, the temperature of the temperature adjusting chamber  75   c  is returned to the same temperature as that of the others, for example, 23° C. 
     Thereafter, the wafer W is lifted again by the rotary drive mechanism  62  and delivered to the main carrier unit  13 , and then it is carried out of the resist coating unit  17 . 
     According to the above embodiment, the temperature on the wafer W which exerts on the thickness of the resist film can be adjusted to a previously obtained temperature distribution within a predetermined range to uniformly form a resist film based on the measured value of the temperature on the wafer W, so that a uniform resist film can be formed by the spin coating method. 
     Further, since the temperature on the wafer W is indirectly measured through the use of the reflector  87 , the position of the thermo viewer  85  can be set at the side of the casing  17   a  to thereby keep the height of the resist coating unit itself low. Incidentally, there also is a case in which it is not necessary to consider the height, wherein the temperature on the wafer W may be directly measured without using the reflector  87 . 
     In the above-described embodiment, the temperature of the clean air from the supply ports  78  of the gas supply means  70  is changed to thereby change the film thickness of the resist film, but humidity or a supply direction of the clean air may be changed in place of the temperature. 
     Although the temperature of the clean air and the supply position thereof are changed based on the measured result of the thermo viewer  85  in the above-described embodiment, for example, a solvent vapor which can change the atmosphere on the wafer W, for example, temperature and humidity may be supplied onto the wafer W. This case will be explained hereafter as a second embodiment. 
     In the configuration of the resist coating unit  17  according to the second embodiment, as shown in FIG. 9, a solvent vapor discharge nozzle  90  which is horizontally movable is provided above the wafer W. Moreover, a nozzle controller  92  for controlling the discharge timing and horizontal movement of the solvent vapor discharge nozzle  90  is provided so that the data is sent from the thermo viewer  85  to the nozzle controller  92 . 
     Then, the wafer W is mounted on the spin chuck  60 , and the temperature on the wafer W is measured by the thermo viewer  85  as in the first embodiment and compared with the aforementioned ideal temperature distribution. When there is a portion which deviates from the allowable range, the data of the position and temperature of the deviating portion is sent to the nozzle controller  92 . Based on the data, the position of the solvent vapor discharge nozzle  90  is moved and a predetermined solvent vapor, for example, a thinner is jetted to the deviating portion on the wafer W at a predetermined timing, for example, simultaneously with the resist solution being supplied onto the wafer W. 
     This changes the temperature and humidity of the atmosphere at the deviating portion on the wafer W to change the quantity of vaporization of the resist solution, thereby correcting the thickness of the resist film to form a uniform resist film on the wafer W. 
     As a third embodiment, it can be suggested to change the quantity of exhaust from the exhaust port  80  based on the measured result of the thermo viewer  85 . In this case, the thermo viewer  85 , which is configured to be able to send its data to the suction device  81  as shown in FIG. 10, compares the measured result with the previously obtained ideal temperature distribution as in the above-described first embodiment and sends the data only when correction is necessary to change the quantity of exhaust from the exhaust port  80  based on the data. Thereby, the atmosphere near the peripheral portion of the wafer W is exhausted more than in the other portion, changing the humidity of the peripheral portion of the wafer W, thereby changing the quantity of vaporization of the resist solution from the peripheral portion of the wafer W. As a result, the thickness of the resist film is adjusted to thereby form a predetermined uniform resist film. 
     Further, as a fourth embodiment, it can be suggested to change the rotational speed of the spin chuck  60  based on the measured result of the thermo viewer  85 . In this case, the thermo viewer  85 , which is configured to be able to send its data to the rotary drive mechanism  62  as shown in FIG. 11, compares the measured result with the previously obtained ideal temperature distribution as in the above-described first embodiment and sends the data to the rotary drive mechanism  62  only when correction is necessary to change the rotational speed based on the data. This increases or decreases the quantity of vaporization on the wafer W to correct the thickness of the resist film, thereby forming a predetermined uniform resist film. 
     The fourth embodiment is applicable not only to the case of forming the resist film on the wafer W in the resist coating treatment but also to the case of forming a solution film of the developing solution on the wafer W in the developing treatment. Especially in the developing treatment, the developing treatment is normally performed by first forming a thin film of the developing solution or pure water on the wafer W and then completely supplying and building up the developing solution on the wafer W, and the rotational speed of the wafer W when the thin film is formed thereon may be adjusted based on a measured value of the temperature. More specifically, prior to the supply of the developing solution, the temperature on the wafer W is measured, and the measured value is compared with a previously obtained ideal temperature distribution, so that the rotational speed is adjusted only when the measured value exceeds, for example, a certain threshold. This changes the quantity of vaporization of the developing solution on the wafer W as described above, thereby adjusting the thin film formed on the wafer W to be more uniform. Consequently, the developing treatment of the wafer W is uniformly performed within the wafer W. 
     The temperature of the front face of the wafer W mounted on the spin chuck  60  is measured in the above-described embodiments, and in addition to that, the temperature of the upper face  60   a  of the spin chuck  60  which is the holding member may be measured, for example, by the thermo viewer  85  prior to the mounting of the wafer W. This is because heat such as frictional heat and the like is often accumulated in the spin chuck  60  gradually while many wafers W are processed to increase the temperature of the spin chuck  60 , and the increase in temperature of the spin chuck  60  leads to an increase in temperature of the wafer W mounted thereon. 
     Then, the temperature of the spin chuck  60  is adjusted based on the aforesaid measured result, and the adjusting means for that may employ any means described in the first to the fourth embodiment. For example, the gas supply means  70  may be used to adjust the temperature of the spin chuck  60  as shown in FIG.  12 . 
     Although the reflector  87  is used being fixed to a suitable position in the above-described embodiments, the reflector  87  may be, for example, rotated or linearly moved in the X- and Y-directions to change its position. That movement thus allows the reflector  87  to measure the temperature distribution on the entire face of the wafer W in such a manner to scan above the wafer W. Accordingly, the reflector  87  and the thermo viewer  85  can be made compact. 
     The case in which the spin coating method of rotating the wafer W is used when supplying the resist solution to the wafer W is described in the above-described embodiments. The embodiments are applicable to the case of employing another method of not rotating the wafer W, for example, a method of forming a resist film or another treatment film on the wafer W by supplying the resist solution or the like while a supply means of the resist solution or another treatment solution is being moved above the wafer W. 
     The above-described embodiments are for the film forming apparatus for applying the resist solution to the wafer W to form the resist film, but the present invention is applicable to another film forming apparatus for an insulating film, for example, an SOD, SOG film forming apparatus, and further to a developing treatment apparatus for forming a solution film of the developing solution on the wafer W. Furthermore, the apparatus can be applied to a film forming apparatus for a substrate other than the wafer W, for example, an LCD substrate. 
     According to the present invention, the temperature of the substrate or the holding member is measured, and the temperature, the humidity, or the like on the substrate is corrected based on the measured value, whereby a film can be formed more uniformly on the substrate, resulting in improved yields. In the case where the temperature of the substrate is measured before the supply of the treatment solution, its processing environment is corrected individually for each substrate based on the measured result, thereby preferably performing the film forming processing of the substrate. 
     The employment of a non-contact temperature measuring device or a thermal infrared measuring device as the temperature measuring device eliminates the necessity of provision of the temperature measuring device directly on the substrate and enables non-contact measurement. Especially when the substrate is processed being rotated, non-contact in terms of eccentricity of the substrate, the cutting of electric line or the like, is a great advantage.