Patent Publication Number: US-2020292131-A1

Title: Fluid supply apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0030095, filed on Mar. 15, 2019, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Field of the Invention 
     The present invention relates to a fluid supply apparatus, that is, a fluid supply apparatus configured to supply a fluid having a predetermined temperature to a chamber. 
     2. Discussion of Related Art 
     With the recent rapid development of information and telecommunication fields and popularization of information media such as computers, semiconductor devices are also rapidly developing. In addition, from a functional viewpoint thereof, various methods are being researched and developed to reduce a size of an individual element formed on a substrate according to a trend that elements of a semiconductor device are highly integrated and also to maximize functions of the elements. 
     Generally, semiconductor elements are manufactured by repeatedly performing a plurality of processes, such as lithography, deposition, etching, coating and developing of a photoresist, cleaning, and drying processes, on a substrate. 
     Each of the processes is performed using a process fluid suitable to an objective of the process and requires a suitable process environment. 
     Generally, a chamber or bath in which a corresponding environment is formed accommodates a substrate to perform each of the processes, and the chamber sealed to prevent introduction of external particles may accommodate the substrate therein to perform the processes. 
     Particles, such as metal impurities and organic matters, remain on the substrate on which each of the processes is performed, and such contaminants lead to process defects of the substrate and have a negative effect on product yield and reliability. 
     Accordingly, cleaning and drying processes, which are repeatedly performed to remove the particles whenever the processes are completed, are very important. 
     The cleaning process is classified as a wet cleaning process or a dry cleaning process, and the wet cleaning process among the wet cleaning process and the dry cleaning process is widely used in a semiconductor manufacturing field. 
     The wet cleaning process is a method of consecutively removing the contaminants using chemical materials suitable to the contaminants for each process, and large amounts of acid and alkaline solutions are used to remove the contaminants remaining on the substrate. 
     In the dry etching process, a supercritical fluid is widely used. Particularly, since a design rule of a semiconductor element is continuously decreased so that a fine pattern is mainly formed and an aspect ratio of the pattern is rapidly increased, a supercritical fluid is used as a solution to a pattern leaning phenomenon that occurs when a chemical liquid is dried after a wet process such as the etching process, the cleaning process, or the like. 
     A material reaches a supercritical state in which the material is indistinguishable between a gas and a liquid above limits of a certain high temperature and a predetermined high pressure which are called critical points, and the material in the state is called a supercritical fluid. 
     The supercritical fluid has a property that a change in a molecular density is big. A molecular density of the supercritical fluid is close to that of a liquid, but a viscosity thereof is low and close to that of a gas. In addition, the supercritical fluid has unique properties of quickly diffusing like a gas so that thermal conductivity thereof is high as much as that of water but is used as a solvent like a liquid so that a concentration of the solvent is high around a solute, and the supercritical fluid is not affected by surface tension. Accordingly, the supercritical fluid is used in various fields because the supercritical fluid is very useful for chemical reactions and has a high ability to extract and separate certain components from a mixture, and particularly, supercritical carbon dioxide, which is a material that has a critical temperature close to room temperature and is a nonpolar material, is highly utilized. 
     Accordingly, a study is being actively conducted for a fluid supply apparatus configured to maintain a temperature of a fluid greater than or equal to a suitable temperature, that is, a critical temperature, wherein the fluid flows through a supply line to be supplied to a chamber in a supercritical state. 
     A fluid supply apparatus configured to supply a fluid to a substrate process chamber according to the conventional technology will be described with reference to  FIG. 1 . 
     The fluid supply apparatus according to the conventional technology includes a fluid tank  10  which temporarily stores a fluid to be supplied to a substrate process chamber  30 , and a supply line  20  which connects the chamber  30  and the fluid tank  10 . The fluid tank  10  includes a fluid tank heater  11  which heats the fluid in the fluid tank  10 , and the supply line  20  includes a supply line heater  21  which heats the fluid flowing through the supply line  20  and a supply line pump  22  which pumps the fluid such that the fluid flows toward the chamber  30 . 
     Carbon dioxide in a gas or liquid state is introduced into and sorted in the fluid tank  10 , and the carbon dioxide is heated by the fluid tank heater  11  and reaches a supercritical state. 
     A temperature of the supercritical carbon dioxide is decreased when the supercritical carbon dioxide flows to the chamber  30  through the supply line  20 , and the supercritical carbon dioxide is heated by the supply line heater  21  to restore the decreased temperature and is supplied to the chamber  30 . 
     In this case, since a substrate treatment process is performed in the chamber  30  and the carbon dioxide is continuously supplied to the chamber  30 , the carbon dioxide stored in the fluid tank  10  may be introduced into the supply line  20  in a state in which the carbon dioxide is not sufficiently heated. 
     Although the carbon dioxide is heated by the supply line heater  21 , the carbon dioxide in a liquid or gas state of which a temperature does not meet a critical temperature may be introduced into the chamber  30 , or the carbon dioxide in an unstable supercritical state of which a temperature barely meets the critical temperature may be introduced into the chamber  30 , and thus a phase thereof may be changed into a liquid or gas state. 
     Accordingly, as the substrate treatment processes are progressed, process defects may occur because drying processes using the supercritical carbon dioxide are not smoothly performed. 
     An example of the related art of the substrate process chamber is disclosed in Korean Patent Registration No. 10-1336727. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to providing a fluid supply apparatus configured to supply a fluid having a predetermined temperature to a chamber. 
     According to an aspect of the present invention, there is provided a fluid supply apparatus including a supply line through which a fluid to be supplied to a chamber flows, at least one bypass line which branches off from a first branch portion of the supply line and is connected to a second branch portion of the supply line, and a heater configured to heat the fluid flowing through the bypass line. 
     The first branch portion may include a path switch configured to switch a flow path of the fluid such that the fluid selectively flows through the supply line or the bypass line. 
     The path switch may include a supply valve configured to open or close the supply line and a bypass valve configured to open or close the bypass line or may include a three way valve configured to simultaneously open or close the supply line and the bypass line connected from the first branch portion to the chamber. 
     In addition, a thermometer configured to measure a temperature of a fluid flowing through the supply line may be provided, and the thermometer may include a first measurement unit configured to measure a temperature of the fluid flowing toward the first branch portion and a second measurement unit configured to measure a temperature of the fluid flowing from the second branch portion toward the chamber. 
     In this case, a controller may control the path switch to switch the flow path of the fluid according to a first temperature measurement value of the fluid measured by the first measurement unit. 
     In addition, the controller may compare a second temperature measurement value of the fluid measured by the second measurement unit with a preset second set value to control a heating temperature of the heater. 
     In addition, a plurality of temperature control units each including the bypass line, the heater, the first measurement unit, and the path switch may be provided in series on the supply line, and the second measurement unit may measure a temperature of the fluid flowing from a rear end of the plurality of temperature control units toward the chamber. 
     In this case, the controller may compare a second temperature measurement value of the fluid measured by the second measurement unit with a preset second set value to adjust a heating temperature of at least one of a plurality of heaters included in the plurality of temperature control units. 
     In addition, the fluid supply apparatus according to the present invention may further include a fluid tank which stores a predetermined amount of the fluid and supplies the fluid to the supply line, a fluid tank heater configured to heat the fluid in the fluid tank, and a supply line heater configured to heat the fluid flowing through the supply line. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings, in which: 
         FIG. 1  is a schematic view illustrating a fluid supply apparatus according to a conventional technology; 
         FIG. 2  is a schematic view illustrating a fluid supply apparatus according to a first embodiment of the present invention; 
         FIG. 3  is a schematic view illustrating a fluid supply apparatus according to a second embodiment of the present invention; 
         FIG. 4  is a schematic view illustrating a fluid supply apparatus according to a third embodiment of the present invention; 
         FIG. 5  is a schematic view illustrating a fluid supply apparatus according to a fourth embodiment of the present invention; 
         FIG. 6  is a schematic view illustrating a fluid supply apparatus according to a fifth embodiment of the present invention; and 
         FIG. 7  is a schematic view illustrating a fluid supply apparatus according to a sixth embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Configurations and operations of a fluid supply apparatus according to the present invention will be described in detail with reference to the accompanying drawings. 
     Here, detailed descriptions of the contents of the present invention which are redundant with those of the described conventional technology will be omitted, and newly added contents according to the present invention will be mainly described. 
     In addition, in the detailed descriptions of the present invention, a “front end” is referred to as “one end (a right end in the drawing)” in a direction opposite to a direction in which a fluid moves, and a “rear end” is referred to as “one end (a left end in the drawing)” in a direction in which the fluid flows. 
     A fluid supply apparatus according to a first embodiment of the present invention will be described with reference to  FIG. 2 . The fluid supply apparatus according to the first embodiment of the present invention includes a supply line  200  through which a fluid to be supplied to the chamber  300  flows, at least one bypass line  400  which branches off from a first branch portion  210  of the supply line and is connected to a second branch portion  220  of the supply line, and a heater  430  configured to heat the fluid flowing through the bypass line  400 . 
     The chamber  300  may be a substrate process chamber configured to accommodate and process a semiconductor substrate, and the fluid may be a process fluid which is supplied to the chamber  300  to process the substrate. 
     The process fluid may be a cleaner to remove contaminants on the substrate, and a plurality of different cleaners may be used according to kinds of contaminants to be processed. 
     For example, an organic solvent and nitrogen (N2) gas may be used to remove a resist. In addition, water, hydrogen fluoride (HF), isopropyl alcohol (IPA), and nitrogen (N2) gas may be used to remove silicon oxide (SiO). In addition, hydrochloric acid (HCl), ozone (O 3 ), and nitrogen (N2) gas may be used to remove a metal. In addition, ozone (O 3 ) and nitrogen (N2) gas may be used to remove an organic material except for the resist. In addition, an ammonia peroxide mixture (APM), nitrogen (N2) gas, or argon (Ar) gas may be used to remove other particles. In addition, water, isopropyl alcohol (IPA), and nitrogen (N2) gas may be used to remove ions of fluorine (F), chlorine (Cl), and ammonia (NH 4 ). 
     In addition, the process fluid may be a drying agent to dry the substrate which is supplied to the chamber  300  and on which a cleaning process is performed by the cleaner. 
     The drying agent is provided to correspond to a kind of the cleaner supplied to the substrate, and a supercritical fluid of carbon dioxide (CO 2 ), water (H 2 O), methane (CH 4 ), ethane (C 2 H 6 ), propane (C 3 H 8 ), ethylene (C 2 H 4 ), propylene (C 2 H 2 ), methanol (C 2 H 3 OH), ethanol (C 2 H 5 OH), sulfur hexafluoride (SF 6 ), acetone (C 3 H 8 O), or the like may be used as the drying agent. 
     A temperature of the process fluid is set to a suitable temperature, and the process fluid is supplied to the chamber  300  to perform a cleaning or drying process for the substrate. 
     As an example, in a case in which a drying process using supercritical carbon dioxide as a process fluid is performed in the chamber  300 , the process fluid is set to a temperature greater than or equal to a critical temperature and supplied to the chamber  300  in a supercritical state. 
     According to the first embodiment, the second branch portion  220  is formed behind the first branch portion  210 , the fluid flows through only the supply line  200  and is supplied to the chamber  300 , or the fluid flows through the first branch portion  210  and the bypass line  400 , is heated by the heater  430 , is re-introduced into the supply line  200  thorough the second branch portion  220 , and is supplied to the chamber  300 . 
     The heater  430  may be a coil type heater which is spirally wound along a circumference of the bypass line  400 . 
     The first branch portion  210  includes a path switch  600  configured to selectively switch a flow path of the fluid such that the fluid selectively flows through the supply line  200  or the bypass line  400 . 
     The path switch  600  may include a supply valve  610  configured to open or close a rear end of the first branch portion  210  on the supply line  200 , and a bypass valve  620  configured to open or close the bypass line  400 . 
     When the supply valve  610  is opened and the bypass valve  620  is closed, the fluid flows through only the supply line  200  and is supplied to the chamber  300 . 
     When the supply valve  610  is closed and the bypass valve  620  is opened, the fluid flows through the first branch portion  210  and the bypass line  400 , is introduced into the supply line  200  through the second branch portion  220 , and is supplied to the chamber  300 . 
     A supply line pump  710  which pumps the fluid such that the fluid flows toward the chamber  300  may be provided on the supply line  200 , and a bypass pump  720  which pumps the fluid such that the fluid flows from the first branch portion  210  toward the second branch portion  220  may be further provided on the bypass line  400 . 
     In this case, the path switch  600 , the supply line pump  710 , and the bypass pump  720  may be organically controlled by a controller (not shown). 
     In addition, a backflow preventer  800  configured to prevent a backflow of the fluid flowing through the bypass line  400  may be provided on the bypass line  400 , and the backflow preventer  800  may be provided with a check valve. 
     In addition, thermometers  510  and  520  configured to measure a temperature of the process fluid flowing through the supply line  200  are provided on the supply line  200 . 
     The thermometers  510  and  520  include a first measurement unit  510  which is provided on the first branch portion  210  or in front of the first branch portion  210  and measures a temperature of the fluid flowing toward the first branch portion  210 . 
     A first temperature measurement value which is a measurement value of the temperature of the fluid measured by the first measurement unit  510  may be transmitted to the controller, and the controller may compare a first set value which is a preset value of a temperature having the first temperature measurement value to control the path switch  600  according to the result. 
     In this case, since the fluid introduced into the bypass line  400  is heated by the heater  430 , the path switch  600  is controlled to control whether the fluid passes through the bypass line  400  so as to control whether the fluid is heated. 
     According to one embodiment, the first set value may be set to a lowest value of a temperature required for the fluid. In this case, the controller opens the supply valve  610  and closes the bypass valve  620  when the first temperature measurement value is greater than or equal to the first set value to control the fluid to be directly supplied to the chamber  300  through the supply line  200 . 
     In addition, the controller controls the supply valve  610  to be closed and the bypass valve  620  to be opened when the first temperature measurement value is less than the first set value to control the fluid to flow through the bypass line  400  and to be heated by the heater  430  so that temperature suitability of the fluid supplied to the chamber  300  can be improved. 
     In addition, the thermometers  510  and  520  may further include a second measurement unit  520  which is provided in front of the chamber  300  on the supply line  200  and configured to measure a temperature of the fluid that is finally introduced into the chamber  300 . 
     The second measurement unit  520  may check a temperature of the fluid flowing from the second branch portion  220  to the chamber  300 . 
     The controller compares a second temperature measurement value which is a temperature measurement value of the fluid measured by the second measurement unit  520  and a second set value which is a preset value of a temperature to control a heating temperature of the heater. 
     In this case, since a temperature loss occurs which is proportional to a time period and a distance while the fluid flows, the first set value of a temperature is set to be greater than or equal to the second set value by considering the flowing distance of the fluid of which a temperature is sequentially measured by the first measurement unit  510  and the second measurement unit  520 . 
     As an example, in a case in which the supercritical carbon dioxide is supplied as the process fluid to the chamber  300  in which a drying process is performed, the second set value of a temperature may be set to be greater than or equal to a value of a supercritical temperature, and the first set value of a temperature may be set to be greater than the second set value to maintain the carbon dioxide in a supercritical state and to supply the carbon dioxide to the chamber  300 . 
     In addition, in a case in which the second temperature measurement value is less than the second set value, the controller controls the heater to further increase a heating temperature. 
     Accordingly, since the fluid flowing through the bypass line  400  is heated to have a higher temperature, and the second temperature measurement value of the fluid flowing toward the chamber  300  meets the second set value, temperature suitability of the fluid can be improved. 
     A fluid supply apparatus according to a second embodiment of the present invention will be described with reference to  FIG. 3 . A configuration of the fluid supply apparatus according to the second embodiment of the present invention is the same as the configuration of the fluid supply apparatus according to the first embodiment except that a path switch provided in a first branch portion  210  includes a three way valve  630 . 
     The three way valve  630  opens a rear end of the first branch portion  210  on a supply line  200  and simultaneously closes a bypass line  400  or, conversely, closes the rear end of the first branch portion  210  on the supply line  200  and simultaneously opens the bypass line  400  to selectively switch a flow path of a fluid flowing in the supply line  200  so that a configuration of the path switch  600  can be simplified and the flow path of the fluid can also be easily switched. 
     A fluid supply apparatus according to a third embodiment of the present invention will be described with reference to  FIG. 4 . A configuration of the fluid supply apparatus according to the third embodiment of the present invention is the same as the configuration of the fluid supply apparatus according to the first embodiment except that a first branch portion  210  is formed behind a second branch portion  220 . 
     According to the third embodiment, a circulation path is formed that includes a supply line  200 , in which the second branch portion  220  is connected to the first branch portion  210 , and a bypass line  400 . 
     Accordingly, in a case in which a first temperature measurement value of a first measurement unit  510  is less than a first set value, a fluid flows through the first branch portion  210  and the bypass line  400 , is heated, is introduced into the supply line  200  through the second branch portion  220 , and flows toward the first branch portion  210 , and thus the fluid circulates along the circulation path. 
     In this case, the first measurement unit  510  measures a temperature of the fluid which circulates and returns along the circulation path, and in a case in which the measured first temperature measurement value is less than the first set value, the fluid circulates in the circulation path again and is heated so that temperature suitability of the fluid can be improved. 
     To this end, a controller may control path switches to maintain a state in which the supply line is closed and the bypass line is opened until the first temperature measurement value meets a value of a temperature greater than or equal to the first set value. 
     A fluid supply apparatus according to a fourth embodiment of the present invention will be described with reference to  FIG. 5 . A configuration of the fluid supply apparatus according to the fourth embodiment of the present invention is the same as the configuration of the fluid supply apparatus according to the first embodiment except that sets of temperature control units U 1  and U 2  respectively include bypass lines  410  and  420 , heaters  431  and  432 , first measurement units  511  and  512 , and path switches  640  and  650  and the plurality of sets of the temperature control units U 1  and U 2  are provided on a supply line  200  in series. 
     In addition, a second measurement unit  520  measures a temperature of a fluid flowing from a rear end of the plurality of sets of the temperature control units U 1  and U 2  to a chamber  300 . 
     As an example of the third embodiment, an example of the fluid supply apparatus including two sets of temperature control units U 1  and U 2 , that is, a first temperature control unit U 1  and a second temperature control unit U 2 , which are sequentially provided on the supply line  200 , will be described. 
     Referring to  FIG. 5 , the bypass line  410  of the first temperature control unit U 1  branches off from a third branch portion  263  of the supply line  200  and is connected to a fourth branch portion  264 . 
     The first measurement unit  511  of the first temperature control unit U 1  measures a temperature of the fluid flowing toward the third branch portion  263 , and a controller compares the measurement value of the temperature of the fluid having a first set value of the first measurement unit  511  of the first temperature control unit U 1  to control the path switch  640  of the first temperature control unit U 1 . 
     Accordingly, the fluid flowing toward the third branch portion  263  flows through the supply line  200  to the fourth branch portion  264  or flows through the bypass line  410  of the first temperature control unit U 1 , is heated by the heater  431 , and flows to the fourth branch portion  264 . 
     In addition, the bypass line  420  of the second temperature control unit U 2  branches off from a fifth branch portion  265  of the supply line  200  and is connected to a sixth branch portion  266 . 
     The first measurement unit  512  of the second temperature control unit U 2  measures a temperature of the fluid flowing from the fourth branch portion  264  toward the fifth branch portion  265  and compares the measurement value of a temperature of the fluid having a first set value of the first measurement unit  512  of the second temperature control unit U 2  to control the path switch  650  of the second temperature control unit U 2 . 
     Accordingly, the fluid flowing toward the fifth branch portion  265  flows to the sixth branch portion  266  through the supply line  200  or flows through the bypass line  420  of the second temperature control unit U 2 , is heated by the heater  432 , and flows to the fourth branch portion  264 . 
     In this case, the first set value of a temperature set in the first measurement unit  511  of the first temperature control unit U 1  and the first set value of a temperature set in the first measurement unit  512  of the second temperature control unit U 2  are set to be greater than a second set value by considering a flow distance of the fluid. 
     In addition, the first set value of a temperature set in the first measurement unit  511  of the first temperature control unit U 1  may be set to be greater than the first set value set in the first measurement unit  512  of the second temperature control unit U 2 . 
     In addition, in a case in which the second temperature measurement value is less than the second set value, the controller adjusts a heating temperature of the heater  431  of the first temperature control unit U 1  or the heater  432  of the second temperature control unit U 2  to be further increased. 
     Accordingly, the second temperature measurement value of the fluid, which flows to the chamber  300  through the bypass line  410  of the first temperature control unit U 1  or through the bypass line  420  of the second temperature control unit U 2 , meets the second set value, and thus temperature suitability of the fluid can be improved. 
     A fluid supply apparatus according to a fifth embodiment of the present invention will be described with reference to  FIG. 6 . A configuration of the fluid supply apparatus according to the fifth embodiment of the present invention is the same as the configuration of the fluid supply apparatus according to the first embodiment except that a fluid tank  100  which stores a predetermined amount of a fluid and supplies the predetermined amount of the fluid to a supply line  200  and a fluid tank heater  110  configured to heat the fluid in the fluid tank  100  are included therein. 
     The fluid tank heater  110  may be provided to heat the fluid in the fluid tank  100  by heating at least one side surface of the fluid tank  100 . 
     Accordingly, the fluid may be heated first by the fluid tank heater  110  in a state in which the fluid is stored in the fluid tank  100  and supplied to a supply line  200 , and since the fluid can be stably heated when compared to a method of heating a flowing fluid, temperature suitability of the fluid can be improved. 
     In addition, when a first temperature measurement value measured by a first measurement unit  510  does not meet a preset first set value, a controller controls the fluid to flow through a first branch portion  210  toward a bypass line  400 , be heated secondarily by a heater  430 , and be introduced into the supply line  200  through a second branch portion  220  so that temperature suitability can be improved. 
     A fluid supply apparatus according to a sixth embodiment of the present invention will be described with reference to  FIG. 7 . A configuration of the fluid supply apparatus according to the sixth embodiment of the present invention is the same as the configuration of the fluid supply apparatus according to the first embodiment except that at least one supply line heater  230  configured to heat a fluid flowing through a supply line  200  is included. 
     The supply line heater  230  may be a coil type heater which is spirally wound along a circumference of the supply line  200 . 
     The supply line heater  230  may serve a complementary function to a heater  430  to improve temperature suitability of the fluid. 
     As described above, in the fluid supply apparatus according to the present invention, the bypass line  400  is connected to the supply line  200 , the heater  430  is provided on the bypass line  400 , and the flow path of the fluid is switched to select whether or not to heat the fluid, and thus temperature suitability of the fluid supplied to the chamber  300  can be improved. 
     In addition, the thermometers  510  and  520  configured to measure a temperature of the fluid flowing through the supply line  200  are provided, and the controller organically controls the path switch  600  configured to switch the flow path of the fluid according to temperature measurement values of the thermometers  510  and  520 , and thus user convenience can be improved. 
     In addition, since the first measurement unit configured to measure a temperature of the fluid flowing toward the first branch portion  210  is provided to switch the flow path of the fluid according to a first temperature measurement value so as to select whether or not to heat the fluid, temperature suitability of the fluid supplied to a chamber  300  can be improved. 
     In addition, since the path switch  600  includes the three way valve  630 , a structure of the path switch  600  can be simplified and the flow path of the fluid can be simply switched. 
     In addition, since the second measurement unit configured to measure a temperature of the fluid flowing toward the chamber  300  is provided to adjust a heating temperature of the heater  430  according to a second temperature measurement value, temperature suitability of the fluid supplied to the chamber  300  can be improved. 
     In addition, since the second branch portion  220  is formed behind the first branch portion  210  to repeatedly circulate the fluid along the circulation path including the bypass line  400  and to repeatedly heat the fluid, temperature suitability of the fluid can be improved. 
     In addition, the plurality of temperature control units U 1  and U 2  are provided on the supply line  200 , and the fluid flows through the plurality of bypass lines  410  and  420  and is heated a plurality of times, and thus temperature suitability of the fluid can be improved. 
     In addition, a predetermined amount of the fluid is stored in the fluid tank  100 , is heated first by the fluid tank heater  110 , and is supplied to the supply line  200 , and thus temperature suitability of the fluid can be improved. 
     In addition, since the supply line heater  230  configured to heat the fluid flowing through the supply line  200  is provided to serve a complementary function to the heater  430 , temperature suitability of the fluid can be improved. 
     By using the fluid supply apparatus according to the present invention, since a fluid having a predetermined temperature is supplied to a chamber and used to perform a substrate treatment process, a process defect of a substrate due to a decrease in temperature of the fluid can be prevented. 
     In addition, since heating of the fluid can be selected by switching a flow path, temperature suitability of the fluid supplied to the chamber can be improved. 
     The present invention is not limited to the above described embodiments and may be clearly modified by those skilled in the art without departing from the technical spirit of the present invention appended in the claims, and such a modified embodiment will be included in the scope of the present invention.