Patent Publication Number: US-2020303218-A1

Title: Substrate cleaning equipment, substrate treatment system including the same, and method of fabricating semiconductor device using the substrate cleaning equipment

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2019-0032129, filed on Mar. 21, 2019, and Korean Patent Application No. 10-2019-0085475, filed on Jul. 16, 2019, in the Korean Intellectual Property Office, the disclosures of which are incorporated by reference herein in their entireties. 
     TECHNICAL FIELD 
     Exemplary embodiments of the present disclosure relate to substrate cleaning equipment, a substrate treatment system including the same, and a method of fabricating a semiconductor device using the substrate cleaning equipment. More particularly, exemplary embodiments of the present disclosure relate to substrate cleaning equipment which cleans a substrate after a chemical mechanical planarization (CMP) process has been performed, and a system and method using the substrate cleaning equipment. 
     DISCUSSION OF THE RELATED ART 
     After a chemical mechanical planarization (CMP) process is performed on a substrate, the substrate is generally cleaned to remove unwanted residues and particles from the substrate. For example, slurry, a polished substrate material, or other residues may adhere to the substrate including an edge bezel of the substrate. 
     To remove unwanted materials from the substrate after the CMP process has been performed, the substrate may be rinsed. In addition, after the CMP process has been performed, the substrate may be transferred to cleaning modules such as a scrubber brush box and a megasonic tank. However, some particles and residues remaining after the CMP process has been performed may be difficult to remove using cleaning methods such as brush box scrubbing and megasonic tank immersion. 
     SUMMARY 
     Aspects of the present disclosure provide substrate cleaning equipment which can better remove particles from a substrate after a chemical mechanical planarization (CMP) process has been performed by changing the design of a nozzle for spraying a cleaning liquid. 
     Aspects of the present disclosure also provide a substrate treatment system which can better remove particles from a substrate after a CMP process has been performed by changing the design of a nozzle for spraying a cleaning liquid. 
     Aspects of the present disclosure also provide a method of fabricating a semiconductor device with improved yield and reliability by using substrate cleaning equipment in which the design of a nozzle for spraying a cleaning liquid has been changed. 
     According to an aspect of the present disclosure, substrate cleaning equipment includes a substrate holder which supports a substrate, a swing body, a head, a first cleaning liquid supply structure, and a second cleaning liquid supply structure. The swing body moves along a sweep line on a main surface of the substrate. The head is coupled to the swing body and includes a pad attachment surface facing the substrate holder. The first cleaning liquid supply structure is coupled to the swing body and sprays a first cleaning liquid onto the main surface of the substrate. The second cleaning liquid supply structure sprays a second cleaning liquid onto the main surface of the substrate. A buffing pad is attached to the pad attachment surface, the first cleaning liquid supply structure includes a first nozzle arm movably coupled to the swing body and a first cleaning liquid supply nozzle coupled to the first nozzle arm, and a rotation direction of the substrate is the same as a rotation direction of the buffing pad. 
     According to another aspect of the present disclosure, substrate cleaning equipment includes a substrate holder which supports a substrate, a swing body, a head, a first cleaning liquid cleaning liquid supply structure, and a second cleaning liquid supply structure. The swing body moves along a sweep line on a main surface of the substrate. The head is coupled to the swing body and includes a pad attachment surface facing the substrate holder. The first cleaning liquid supply structure is coupled to the swing body and sprays a first cleaning liquid onto the main surface of the substrate. The second cleaning liquid supply structure is coupled to the swing body and sprays a second cleaning liquid onto the main surface of the substrate. A buffing pad is attached to the pad attachment surface. 
     According to another aspect of the present disclosure, a substrate treatment system for treating a substrate includes chemical mechanical planarization (CMP) equipment and substrate cleaning equipment which receives the substrate after a main surface of the substrate is planarized by the CMP equipment. The substrate cleaning equipment includes a substrate holder which supports the substrate, a swing body, a head, a first cleaning liquid supply structure, and a second cleaning liquid supply structure. The swing body moves along a sweep line on the main surface of the substrate. The head is coupled to the swing body and includes a pad attachment surface facing the substrate holder. The first cleaning liquid supply structure is coupled to the swing body and sprays a first cleaning liquid onto the main surface of the substrate. The second cleaning liquid supply structure sprays a second cleaning liquid onto the main surface of the substrate. A buffing pad is attached to the pad attachment surface, and the first cleaning liquid supply structure includes a first nozzle arm movably coupled to the swing body and a first cleaning liquid supply nozzle coupled to the first nozzle arm. 
     According to another aspect of the present disclosure, a method of fabricating a semiconductor device includes planarizing a main surface of a substrate using a CMP process, and cleaning the planarized main surface of the substrate using substrate cleaning equipment. The substrate cleaning equipment includes a substrate holder which supports the substrate, a swing body, a head, a first cleaning liquid supply structure, and a second cleaning liquid supply structure. The swing body moves along a sweep line on the main surface of the substrate. The head is coupled to the swing body and includes a pad attachment surface facing the substrate holder. The first cleaning liquid supply structure is coupled to the swing body and sprays a first cleaning liquid onto the main surface of the substrate. The second cleaning liquid supply structure sprays a second cleaning liquid onto the main surface of the substrate. A buffing pad is attached to the pad attachment surface, and the first cleaning liquid supply structure includes a first nozzle arm movably coupled to the swing body and a first cleaning liquid supply nozzle coupled to the first nozzle arm. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which: 
         FIG. 1  is a schematic top view of a substrate treatment system including substrate cleaning equipment according to exemplary embodiments. 
         FIG. 2  schematically illustrates a post chemical mechanical planarization (CMP) unit including substrate cleaning equipment according to exemplary embodiments. 
         FIG. 3  is a cross-sectional view of substrate cleaning equipment according to exemplary embodiments. 
         FIG. 4  illustrates a substrate, a head, a swing body, and first and second cleaning liquid supply structures of  FIG. 3 . 
         FIG. 5  is a diagram illustrating the structure of the head, the swing body, and the first and second cleaning liquid supply structures of  FIG. 3 . 
         FIGS. 6 and 7  are diagrams illustrating the operation of the substrate cleaning equipment when the substrate rotates in a counterclockwise direction. 
         FIG. 8  is a diagram illustrating the operation of the substrate cleaning equipment when the substrate rotates in a clockwise direction. 
         FIG. 9  illustrates substrate cleaning equipment according to exemplary embodiments. 
         FIG. 10  illustrates substrate cleaning equipment according to exemplary embodiments. 
         FIG. 11  is a cross-sectional view of substrate cleaning equipment according to exemplary embodiments. 
         FIG. 12  illustrates a substrate, a head, a swing body, and first and third cleaning liquid supply structures of  FIG. 11 . 
         FIG. 13  illustrates substrate cleaning equipment according to exemplary embodiments. 
         FIG. 14  is a cross-sectional view of substrate cleaning equipment according to exemplary embodiments. 
         FIG. 15  illustrates a substrate, a head, a swing body, and first through third cleaning liquid supply structures of  FIG. 14 . 
         FIGS. 16 through 18  are diagrams illustrating substrate cleaning equipment according to exemplary embodiments. 
         FIGS. 19 through 22  are diagrams illustrating substrate cleaning equipment according to exemplary embodiments. 
         FIGS. 23 and 24  are diagrams illustrating substrate cleaning equipment according to exemplary embodiments. 
         FIG. 25  is a flowchart illustrating a method of fabricating a semiconductor device using substrate cleaning equipment according to exemplary embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. Like reference numerals may refer to like elements throughout the accompanying drawings. 
     It should be understood that the terms “first,” “second,” “third,” etc. are used herein to distinguish one element from another, and the elements are not limited by these terms. Thus, a “first” element in an exemplary embodiment may be described as a “second” element in another exemplary embodiment. 
     It should be understood that descriptions of features or aspects within each exemplary embodiment should typically be considered as available for other similar features or aspects in other exemplary embodiments, unless the context clearly indicates otherwise. 
     As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. 
     It should be understood that when two components or directions are described as extending substantially parallel or perpendicular to each other, the two components or directions extend exactly parallel or perpendicular to each other, or extend approximately parallel or perpendicular to each other within a measurement error as would be understood by a person having ordinary skill in the art. Other uses of the word “substantially” should be construed in a similar manner. 
       FIG. 1  is a schematic top view of a substrate treatment system including substrate cleaning equipment according to exemplary embodiments. 
     In  FIG. 1 , the substrate cleaning system is illustrated as including the substrate cleaning equipment according to exemplary embodiments. However, exemplary embodiments are not limited thereto. For example, in some exemplary embodiments, the substrate cleaning equipment may be used alone or together with substrate treatment systems having alternative configurations. 
     Referring to  FIG. 1 , the substrate treatment system may include chemical mechanical planarization (CMP) equipment  110  and a factory interface  120 . 
     The CMP equipment  110  may include an enclosure  111 , a carousel  112 , a controller  113 , and one or more CMP stations  115 . 
     The enclosure  111  may be a space that is environmentally controlled so that a CMP process can be performed. The carousel  112  and the CMP stations  115  may be disposed inside the enclosure  111 . 
     The carousel  112  may be disposed, for example, at or near a center of the enclosure  111 . The carousel  112  may include a plurality of support arms  114  respectively supporting polishing heads  117 . Substrates  100  on which a CMP process is to be performed are loaded onto the polishing heads  117 . 
     The carousel  112  may move the polishing heads  117  onto the CMP stations  115  by rotating the support arms  114 . The polishing heads  117  loaded with the substrates  100  may be moved to an area above polishing pads  116 . 
     The controller  113  may facilitate the control and integration of the CMP equipment  110  and the factory interface  120  included in the substrate treatment system. The controller  113  may be coupled to various components of the substrate treatment system in order to facilitate the control of, e.g., planarization, cleaning, and transfer processes. The controller may be implemented as a circuit, and may also be referred to herein as a controller circuit. 
     The CMP stations  115  may planarize the substrates  100  loaded on the polishing heads  117 . When a plurality of CMP stations  115  is provided, the CMP stations  115  may planarize different materials, respectively. However, exemplary embodiments are not limited to this case. 
     In  FIG. 1 , three CMP stations  115  and four support arms  114  are illustrated. However, exemplary embodiments are not limited to this case. 
     The factory interface  120  may include substrate cassettes  121 , a first transfer unit  122 , a second transfer unit  126 , an input module  123 , a post CMP unit  125 , and an output module  124 . 
     The substrate cassettes  121  may store the substrates  100  before or after a CMP process is performed. 
     The first transfer unit  122  may move a substrate  100  before a CMP process is performed from a substrate cassette  121  to the input module  123 . Alternatively, the first transfer unit  122  may move the substrate  100  after the CMP process is performed from the input module  123  to the post CMP unit  125 . Alternatively, the first transfer unit  122  may move the substrate  100  within the post CMP unit  125  or move the substrate  100  from the post CMP unit  125  to the output module  124 . Alternatively, the first transfer unit  122  may move the substrate  100  post-treated after the CMP process is performed from the output module  124  to the substrate cassette  121 . 
     The input module  123  may store a substrate  100  before being put into the CMP equipment  110 . Alternatively, the input module  123  may store a substrate  100  taken out of the CMP equipment  110  and before being put into the post CMP unit  125 . 
     The second transfer unit  126  may move a substrate  100  between the input module  123  and the CMP equipment  110 . In  FIG. 1 , the second transfer unit  126  is illustrated as being located outside the CMP equipment  110 . However, this is merely an example used for ease of description, and exemplary embodiments are not limited to this example. For example, in exemplary embodiments, a part of the second transfer unit  126  may also be disposed inside the enclosure  111  of the CMP equipment  110 . 
     The post CMP unit  125  may remove unwanted residues or particles that may remain on a substrate  100  after a CMP process has been performed. The post CMP unit  125  will be described in further detail below. 
     The output module  124  may store a substrate  100  post-treated after a CMP process has been performed. 
     In exemplary embodiments, one or more components included in the factory interface  120  of  FIG. 1  may be combined into one component. Conversely, one component included in the factory interface  120  of  FIG. 1  may be separated into a plurality of components. 
     The substrate treatment system may operate as follows. A substrate  100  may be transferred from one of the substrate cassettes  121  to the input module  123  by the first transfer unit  122 . Then, the second transfer unit  126  may load the substrate  100  from the input module  123  to one of the polishing heads  117  of the CMP equipment  110 . The substrate  100  loaded on the polishing head  117  may be oriented horizontally (e.g., substantially parallel to the ground). The substrate  100  loaded on the polishing head  117  may be moved to above the polishing pad  116  of one of the CMP stations  115  and then may be polished. After the substrate  100  is polished, the polished substrate  100  may be transferred to the input module  123  by the second transfer unit  126 . Then, the first transfer unit  122  may collect the polished substrate  100  and transfer the polished substrate  100  to the post CMP unit  125 . While the substrate  100  is cleaned, it may be oriented vertically in each piece of cleaning equipment of the post CMP unit  125 . The post-treated substrate  100  is transferred to the output module  124 . The first transfer unit  122  may transfer the post-treated substrate  100  to the substrate cassette  121  while returning the post-treated substrate  100  to the horizontal orientation. 
       FIG. 2  schematically illustrates a post CMP unit  125  including substrate cleaning equipment  125 B according to exemplary embodiments. 
     In  FIG. 2 , the post CMP unit  125  may include, for example, megasonic equipment  125 A, the substrate cleaning equipment  125 B, first brush equipment  125 C, second brush equipment  125 D, and substrate drying equipment  125 E. 
     The substrate cleaning equipment  125 B may remove residues or particles that may remain on a substrate after a CMP process is performed using a chemical and physical method. The substrate cleaning equipment  125 B may be, for example, particle cleaning equipment. 
     A substrate stored in the input module  123  may be moved to the output module  124  sequentially through the megasonic equipment  125 A, the substrate cleaning equipment  125 B, the first brush equipment  125 C, the second brush equipment  125 D, and the substrate drying equipment  125 E. 
     In each of the megasonic equipment  125 A, the substrate cleaning equipment  125 B, the first brush equipment  125 C, the second brush equipment  125 D, and the substrate drying equipment  125 E, the substrate may be loaded and treated while it is vertically oriented, for example, while its polished surface is oriented substantially vertically (e.g., in the direction of gravity). 
     In  FIG. 2 , the post CMP unit  125  includes four types of post-treatment equipment in addition to the substrate cleaning equipment  125 B. However, exemplary embodiments are not limited to this case. 
       FIG. 3  is a cross-sectional view of substrate cleaning equipment  125 B according to exemplary embodiments.  FIG. 4  illustrates a substrate  100 , a head  330 , a swing body  320 , and first and second cleaning liquid supply structures  340  and  350  of  FIG. 3 .  FIG. 5  is a diagram illustrating the structure of the head  330 , the swing body  320 , and the first and second cleaning liquid supply structures  340  and  350  of  FIG. 3 .  FIGS. 6 and 7  are diagrams illustrating the operation of the substrate cleaning equipment  125 B when the substrate  100  rotates in a counterclockwise direction.  FIG. 8  is a diagram illustrating the operation of the substrate cleaning equipment  125 B when the substrate  100  rotates in a clockwise direction. 
     For reference,  FIG. 4  is a top view as seen from above a main surface  100   a  of the substrate  100 . 
     Referring to  FIGS. 3 through 5 , the substrate cleaning equipment  125 B according to exemplary embodiments may include a housing  301 , a substrate holder  310 , the swing body  320 , the head  330 , the first cleaning liquid supply structure  340 , and the second cleaning liquid supply structure  350 . 
     The housing  301  may provide an internal space for cleaning the substrate  100 . The housing  301  may include a cover  302  which may be opened or closed to allow the substrate  100  to enter or leave the housing  301 . For example, as shown in  FIG. 3 , the cover  302  may include two portions that close downward to cover the housing  301  and open upward to open the housing  301 . However, exemplary embodiments are not limited to this case. In exemplary embodiments, the housing  301  may include a drain formed at a bottom of the housing  301 . A fluid used to clean the substrate  100  may be removed through the drain. 
     The substrate holder  310  may be accommodated in the housing  301 . The substrate  100  may be loaded onto the substrate holder  310 . The substrate holder  310  may support the substrate  100 . The substrate holder  310  may be coupled to a first rotating device  303 . The first rotating device  303  may rotate the substrate holder  310 . While the substrate holder  310  rotates, the substrate  100  loaded on the substrate holder  310  also rotates. 
     The substrate holder  310  may be one of, for example, an electrostatic chuck, a vacuum chuck, and a mechanical gripper. Alternatively, the substrate holder  310  may be any suitable mechanism for holding the substrate  100  firmly while the substrate  100  is cleaned within the substrate cleaning equipment  125 B. 
     The substrate  100  may include the main surface  100   a  and a bottom surface  100   b  which face each other. The main surface  100   a  of the substrate  100  may also be referred to herein as a top surface of the substrate  100 . The main surface  100   a  of the substrate  100  may be a surface on which a CMP process is performed. The main surface  100   a  of the substrate  100  may be a surface planarized by the CMP equipment  110  (see  FIG. 1 ). For example, the main surface  100   a  of the substrate  100  may be a surface on which semiconductor elements and the like are formed. 
     The substrate  100  may be loaded onto the substrate holder  310  such that the main surface  100   a  of the substrate  100  faces the swing body  320 . The substrate holder  310  may support the loaded substrate  100  to keep the substrate  100  oriented in a second direction Y (e.g., the direction of gravity or a substantially vertical direction). While the main surface  100   a  of the substrate  100  is cleaned using a buffing pad  335 , the substrate holder  310  may keep the substrate  100  oriented vertically. 
     The swing body  320  may be spaced apart from the substrate holder  310  in a third direction Z. The swing body  320  may be disposed on the main surface  100   a  of the substrate  100  loaded on the substrate holder  310 . 
     During the operation of the substrate cleaning equipment  125 B, the swing body  320  may move in a substantially straight line along a first direction X on the main surface  100   a  of the substrate  100 . The swing body  320  may move along a sweep line SWEEP LINE on the main surface  100   a  of the substrate  100 . 
     The first direction X may be a direction substantially parallel to the sweep line SWEEP LINE. The sweep line SWEEP LINE may pass through a center of the substrate  100  and pass through a substrate center line WCL substantially parallel to the second direction Y. The substrate center line WCL may be located at or near the center of the substrate  100 . 
     The swing body  320  may be coupled to a linear motion device  307 . The linear motion device  307  may move the swing body  320  along the first direction X. For example, the swing body  320  may reciprocate along the sweep line SWEEP LINE. For example, the swing body  320  may move back and forth along the sweep line SWEEP LINE in the first direction X. 
     The head  330  may be disposed inside the housing  301 . The head  330  may be coupled to the swing body  320 . The head  330  may include a pad attachment surface  330   s  to which the buffing pad  335  is attached. The pad attachment surface  330   s  of the head  330  may face the substrate holder  310 . The pad attachment surface  330   s  of the head  330  may face the main surface  100   a  of the substrate  100 . 
     The head  330  may be coupled to a second rotating device  304 . The second rotating device  304  may rotate the head  330 . While the head  330  rotates, the buffing pad  335  attached to the pad attachment surface  330   s  may rotate. 
     While the swing body  320  moves along the first direction X, the head  330  coupled to the swing body  320  may also move along the first direction X. During the operation of the substrate cleaning equipment  125 B, the head  330  may move in a substantially straight line along the first direction X while rotating. For example, the head  330  may also move in a straight line along the sweep line SWEEP LINE. Here, the “sweep line” SWEEP LINE may be a line connecting areas through which a center of the pad attachment surface  330   s  of the head  330  passes. 
     The substrate holder  310  may rotate in a first rotation direction RD 1 . Since the substrate holder  310  rotates in the first rotation direction RD 1 , the substrate  100  may also rotate in the first rotation direction RD 1 . The head  330  disposed on the main surface  100   a  of the substrate  100  may rotate in a second rotation direction RD 2 . 
     In the substrate cleaning equipment  125 B according to exemplary embodiments, the first rotation direction RD 1  in which the substrate  100  rotates may be the same direction as the second rotation direction RD 2  in which the head  330  rotates. 
     Here, the “rotation direction” refers to a direction in which the substrate  100  rotates about a direction (−Z direction) in which the substrate  100  is seen from the swing body  320 . For example, each of the first rotation direction RD 1  and the second rotation direction RD 2  in  FIG. 4  may be the counterclockwise direction. However, exemplary embodiments are not limited to this case. 
     Each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be coupled to the swing body  320 . The first cleaning liquid supply structure  340  may spray a first cleaning liquid  340 L (see  FIG. 6 ) onto the main surface  100   a  of the substrate  100 . The second cleaning liquid supply structure  350  may spray a second cleaning liquid  350 L (see  FIG. 6 ) onto the main surface  100   a  of the substrate  100 . 
     During the operation of the substrate cleaning equipment  125 B, the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may spray the first cleaning liquid  340 L and the second cleaning liquid  350 L at a boundary of the buffing pad  335  which meets the main surface  100   a  of the substrate  100 . Each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may adjust a flow rate of cleaning liquid sprayed according to operating conditions of the substrate cleaning equipment  125 B. 
     Each of the first cleaning liquid  340 L and the second cleaning liquid  350 L may include a chemical solution. The chemical solution may chemically separate, for example, residues or particles attached to the main surface  100   a  of the substrate  100  from the main surface  100   a  of the substrate  100 . 
     While the swing body  320  moves along the first direction X, the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may also move along the first direction X. Each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may spray a cleaning liquid onto the main surface  100   a  of the substrate  100  while moving along the first direction X. 
     The first cleaning liquid supply structure  340  may include a first nozzle arm  341  and a first cleaning liquid supply nozzle  342 . The first nozzle arm  341  may be coupled to the swing body  320 . The first cleaning liquid supply nozzle  342  may be coupled to the first nozzle arm  341 . 
     The second cleaning liquid supply structure  350  may include a second nozzle arm  351  and a second cleaning liquid supply nozzle  352 . The second nozzle arm  351  may be coupled to the swing body  320 . The second cleaning liquid supply nozzle  352  may be coupled to the second nozzle arm  351 . 
     The first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be connected to liquid sources which supply the first cleaning liquid  340 L and the second cleaning liquid  350 L, respectively. 
     For example, in exemplary embodiments, the first nozzle arm  341  and the second nozzle arm  351  may each include a hollow portion therein. The hollow portion of the first nozzle arm  341  may be connected to one of the liquid sources and to the first cleaning liquid supply nozzle  342 , allowing liquid from the liquid source to travel through the first nozzle arm  341  and be sprayed onto the main surface  100   a  of the substrate  100  through the first cleaning liquid supply nozzle  342 . Similarly, the hollow portion of the second nozzle arm  351  may be connected to the other one of the liquid sources and to the second cleaning liquid supply nozzle  352 , allowing liquid from the other liquid source to travel through the second nozzle arm  351  and be sprayed onto the main surface  100   a  of the substrate  100  through the second cleaning liquid supply nozzle  352 . 
     The position of each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may vary according to the rotation direction of the substrate  100 . This will be described in further detail below with reference to  FIGS. 6 and 7 . 
     A rinsing liquid supply structure  306  may be disposed inside the housing  301 . The rinsing liquid supply structure  306  may provide deionized water or any suitable fluid for rinsing to the substrate  100 . The rinsing liquid supply structure  306  may be connected to a liquid source. 
     The operation of the substrate cleaning equipment  125 B when the substrate  100  rotates in the counterclockwise direction will now be described with reference to  FIGS. 4, 6 and 7 . 
     The swing body  320  may pass through a first point P 1  and a second point P 2  of the sweep line SWEEP LINE. For example, the first point P 1  and the second point P 2  are points disposed on the sweep line SWEEP LINE. A center of the head  330  also passes through the first point P 1  and the second point P 2 . The first point P 1  is closer to a first substrate edge line WEL 1  than the second point P 2  is to the first substrate edge line WEL 1 . For example, a distance between the first point P 1  and the first substrate edge line WEL 1  is less than a distance between the second point P 2  and the first substrate edge line WEL 1 . 
     The first substrate edge line WEL 1  is substantially parallel to the substrate center line WCL and meets the substrate  100  (e.g., meets an edge of the substrate  100 ). In addition, the first substrate edge line WEL 1  is a line that meets the substrate  100  that is farthest away from the substrate center line WCL in the first direction X. A second substrate edge line WEL 2  may correspond to the first substrate edge line WEL 1  on an opposite side of the substrate  100  with respect to the substrate center line WCL. For example, the first substrate edge line WEL 1  may meet a leftmost edge of the substrate  100  with respect to the substrate center line WCL, and the second substrate edge line WEL 2  may meet a rightmost edge of the substrate  100  with respect to the substrate center line WCL. 
     When the buffing pad  335  moves along the sweep line SWEEP LINE as the substrate cleaning equipment  125 B operates, a center of the buffing pad  335 , for example, the center of the head  330 , may pass through the substrate center line WCL. While moving along the sweep line SWEEP LINE, the buffing pad  335  may pass through the first substrate edge line WEL 1  and the substrate center line WCL, but not through the second substrate edge line WEL 2 . For example, the buffing pad  335  may move about half of the main surface  100   a  of the substrate  100  without reaching the second substrate edge line WEL 2 . The movement of the swing body  320  along the sweep line SWEEP LINE may occur on a side of approximately the center (i.e., at exactly the center or near the center within a measurement error as would be understood by one having ordinary skill in the art) of the substrate  100 , for example, on a side of the substrate center line WCL. 
     A direction from the first point P 1  toward the second point P 2  may be a positive first direction +X, and a direction from the second point P 2  toward the first point P 1  may be a negative first direction −X. A direction in which the buffing pad  335  is seen from the substrate  100  is a positive third direction +Z, and a direction in which the substrate  100  is seen from the buffing pad  335  is a negative third direction −Z. A positive second direction +Y and a negative second direction −Y can be described using  FIG. 3 . The positive second direction +Y may be a direction in which the substrate  100  exits out of the housing  301 , and the negative second direction −Y may be a direction in which the substrate  100  enters into the housing  301 . 
     An XX-YY plane may be defined in the swing body  320  overlapping the buffing pad  335  in the third direction Z. The origin of the XX-YY plane may be the center of the buffing pad  335 . The center of the buffing pad  335  may be the center of the pad attachment surface  330   s  of the head  330 . 
     In the XX-YY plane, an XX axis may be the sweep line SWEEP LINE. A YY axis is substantially perpendicular to the XX axis. A positive direction of the YY axis may be the positive second direction +Y, and a negative direction of the YY axis may be the negative second direction −Y. 
     In the XX-YY plane, each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be located in an area in which the YY axis of the XX-YY plane has a positive value. Alternatively, each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be located in an area in which the XX axis has a positive value. 
     In  FIG. 7 , the first cleaning liquid supply structure  340  may be located in the area in which the XX axis has a positive value. The second cleaning liquid supply structure  350  may be disposed in the area in which the YY axis of the XX-YY plane has a positive value. A line (XX axis) passing through the center of the buffing pad  335  and the first cleaning liquid supply structure  340  may be substantially perpendicular to a line (e.g., the YY axis) passing through the center of the buffing pad  335  and the second cleaning liquid supply structure  350 . 
     It is to be understood that the position of each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  shown in  FIG. 7  is merely an example, and exemplary embodiments are not limited thereto. For example, each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may also be located at a position corresponding to a first quadrant or a second quadrant of the XX-YY plane. 
     The first cleaning liquid supply structure  340  may spray the first cleaning liquid  340 L near a boundary at which the buffing pad  335  and the main surface  100   a  of the substrate  100  meet. Since the substrate  100  rotates in the counterclockwise direction and the first cleaning liquid  340 L is affected by a centrifugal force, most of the first cleaning liquid  340 L sprayed onto the main surface  100   a  of the substrate  100  moves in a first cleaning liquid flow direction  340 LF toward a rim (e.g., an edge) of the substrate  100 . Herein, the terms “rim” and “edge” may be used interchangeably. The first cleaning liquid  340 L moving in the first cleaning liquid flow direction  340 LF flows out of the substrate  100  through the rim of the substrate  100  instead of gathering at the center of the substrate  100 . 
     The second cleaning liquid supply structure  350  may spray the second cleaning liquid  350 L near the boundary at which the buffing pad  335  and the main surface  100   a  of the substrate  100  meet. Since the substrate  100  rotates in the counterclockwise direction and the second cleaning liquid  350 L is affected by the centrifugal force, most of the second cleaning liquid  350 L sprayed onto the main surface  100   a  of the substrate  100  moves in a second cleaning liquid flow direction  350 LF toward the rim of the substrate  100 . The second cleaning liquid  350 L moving in the second cleaning liquid flow direction  350 LF flows out of the substrate  100  through the rim of the substrate  100  instead of gathering at the center of the substrate  100 . 
     Particles disposed on and/or attached to the main surface  100   a  of the substrate  100  may be chemically separated from the main surface  100   a  of the substrate  100  by the first cleaning liquid  340 L and the second cleaning liquid  350 L. In addition, particles disposed on and/or attached to the main surface  100   a  of the substrate  100  may be physically separated from the main surface  100   a  of the substrate  100  by the buffing pad  335 . The particles chemically and physically separated from the main surface  100   a  of the substrate  100  may be moved together with the first cleaning liquid  340 L and the second cleaning liquid  350 L. For example, the particles separated from the main surface  100   a  of the substrate  100  may move to the rim of the substrate  100  along the first cleaning liquid flow direction  340 LF and the second cleaning liquid flow direction  350 LF, and then flow out of the substrate  100 . 
     Alternatively, when each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  is located in an area in which the YY axis of the XX-YY plane has a negative value or an area in which the XX axis has a negative value, most of the first cleaning liquid  340 L and most of the second cleaning liquid  350 L may gather around the center of the substrate  100 . In this case, particles separated from the main surface  100   a  of the substrate  100  may adhere again to the center or near the center of the main surface  100   a  of the substrate  100 . 
     The operation of the substrate cleaning equipment  125 B when the substrate  100  rotates in the clockwise direction will now be described with reference to  FIGS. 4, 7 and 8 . Here, for convenience of explanation, only differences from what has been described with reference to  FIG. 6  may be described, and a further description of elements and aspects previously described may be omitted. 
     When the substrate  100  rotates in the clockwise direction, the second cleaning liquid supply structure  350 , which sprays the second cleaning liquid  350 L, may be disposed in the area in which the YY axis of the XX-YY plane has a negative value. 
     Unlike in  FIG. 8 , each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may also be located at a position corresponding to a third quadrant or a fourth quadrant of the XX-YY plane. 
       FIG. 9  illustrates substrate cleaning equipment according to exemplary embodiments. For ease of description, the following description will focus primarily on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     For reference,  FIG. 9  is a diagram used to describe the coupling relationship between a nozzle arm and a cleaning liquid supply nozzle. 
     Referring to  FIGS. 5 and 9 , in the substrate cleaning equipment according to an exemplary embodiment, a first cleaning liquid supply nozzle  342  may be rotatably coupled to a first nozzle arm  341 . 
     The first cleaning liquid supply nozzle  342  may be coupled to the first nozzle arm  341  such that it can rotate in various directions with respect to the first nozzle arm  341 . 
     By rotating the first cleaning liquid supply nozzle  342  with respect to the first nozzle arm  341 , the efficiency of spraying the first cleaning liquid may be improved. For example, the first cleaning liquid supply nozzle  342  may be rotated with respect to the first nozzle arm  341  such that the first cleaning liquid is sprayed with a focus on the specific area(s) in need of being sprayed during a substrate cleaning process. For example, the first cleaning liquid may be specifically sprayed more onto the area(s) in need of being sprayed (e.g., an area(s) having a large concentration of unwanted residues or particles) as compared to other areas (e.g., an area(s) having a small concentration of unwanted residues or particles, or an area(s) having no unwanted residues or particles). 
     Similarly, a second cleaning liquid supply nozzle  352  may be rotatably coupled to a second nozzle arm  351 . 
     In at least one of a first cleaning liquid supply structure  340  and a second cleaning liquid supply structure  350 , a cleaning liquid supply nozzle may be rotatably coupled to a nozzle arm, as described above. 
       FIG. 10  illustrates substrate cleaning equipment according to exemplary embodiments. For ease of description, the following description will focus primarily on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     For reference,  FIG. 10  is a diagram used to describe the coupling relationship between a cleaning liquid supply structure and a swing body. 
     Referring to  FIG. 10 , in the substrate cleaning equipment according to exemplary embodiments, each of a first cleaning liquid supply structure  340  and a second cleaning liquid supply structure  350  may be movably coupled to a swing body  320 . 
     For example, each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be coupled to the swing body  320  such that each of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  can move in a substantially straight line. 
     The swing body  320  may include a first guide rail  340 GL and a second guide rail  350 GL extending in the first direction X and the second direction Y. 
     The first cleaning liquid supply structure  340  may be movably coupled to the swing body  320  using the first guide rail  340 GL. A first nozzle arm  341  may be moved in the second direction Y along the first guide rail  340 GL. The first nozzle arm  341  may be movably coupled to the swing body  320 . 
     The second cleaning liquid supply structure  350  may be movably coupled to the swing body  320  using the second guide rail  350 GL. A second nozzle arm  351  may be moved in the first direction X along the second guide rail  350 GL. The second nozzle arm  351  may be movably coupled to the swing body  320 . 
     Although  FIG. 10  illustrates both the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  being movably coupled to the swing body  320 , exemplary embodiments are not limited thereto. For example, in exemplary embodiments, only one of the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be movably coupled to the swing body  320 . 
       FIG. 11  is a cross-sectional view of substrate cleaning equipment  125 B according to exemplary embodiments.  FIG. 12  illustrates a substrate  100 , a head  330 , a swing body  320 , and first and third cleaning liquid supply structures  340  and  360  of  FIG. 11 . For ease of description, the following description will primarily focus on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     Referring to  FIGS. 11 and 12 , the substrate cleaning equipment  125 B according to exemplary embodiments may include the first cleaning liquid supply structure  340  coupled to the swing body  320 , and the third cleaning liquid supply structure  360  fixed to an inner wall of a housing  301 . 
     The third cleaning liquid supply structure  360  may spray a third cleaning liquid onto a main surface  100   a  of the substrate  100 . The third cleaning liquid may include a chemical solution. The third cleaning liquid supply structure  360  may be connected to a liquid source which supplies the third cleaning liquid. 
       FIG. 13  illustrates substrate cleaning equipment according to exemplary embodiments. For ease of description, the following description will focus primarily on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     For reference,  FIG. 13  is a diagram used to describe the coupling relationship between a cleaning liquid supply structure and a swing body. 
     Referring to  FIG. 13 , in the substrate cleaning equipment according to exemplary embodiments, a first nozzle arm  341  may rotate relative to a point at which the first nozzle arm  341  is coupled to a swing body  320 . For example, the first nozzle arm  341  may rotate in a third rotation direction RD 3 . 
     A second nozzle arm  351  may rotate relative to a point at which the second nozzle arm  351  is coupled to the swing body  320 . For example, the second nozzle arm  351  may rotate in a fourth rotation direction RD 4 . 
     When a distance between an outer circumference of a pad attachment surface  330   s  and a cleaning liquid supply nozzle deviates from an appropriate range as a nozzle arm rotates, a length of the nozzle arm may be increased to make the distance between the outer circumference of the pad attachment surface  330   s  and the cleaning liquid supply nozzle fall within the appropriate range. 
     Although  FIG. 13  illustrates both the first nozzle arm  341  and the second nozzle arm  351  being rotatable relative to a point at which each of the arms are coupled to the swing body  320 , respectively, exemplary embodiments are not limited thereto. For example, in exemplary embodiments, only one of the first nozzle arm  341  and the second nozzle arm  351  may rotate relative to a point at which the arm is coupled to the swing body  320 . Alternatively, only one of the first nozzle arm  341  and the second nozzle arm  351  may be extended in its longitudinal direction. 
       FIG. 14  is a cross-sectional view of substrate cleaning equipment  125 B according to exemplary embodiments.  FIG. 15  illustrates a substrate  100 , a head  330 , a swing body  320 , and first through third cleaning liquid supply structures  340  through  360  of  FIG. 14 . For ease of description, the following description will primarily focus on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     Referring to  FIGS. 14 and 15 , the substrate cleaning equipment  125 B according to exemplary embodiments may further include the third cleaning liquid supply structure  360  fixed to an inner wall of a housing  301 . 
     The third cleaning liquid supply structure  360  may spray a third cleaning liquid onto a main surface  100   a  of the substrate  100 . Since the third cleaning liquid is sprayed onto the main surface  100   a  of the substrate  100  in addition to a first cleaning liquid sprayed by the first cleaning liquid supply structure  340  and a second cleaning liquid sprayed by the second cleaning liquid supply structure  350 , particles disposed on and/or attached to the main surface  100   a  of the substrate  100  can be removed more efficiently. 
       FIGS. 16 through 18  are diagrams illustrating substrate cleaning equipment  125 B according to exemplary embodiments. For ease of description, the following description will primarily focus on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     For reference,  FIG. 16  is a diagram used to describe the operation of the substrate cleaning equipment  125 B when a substrate  100  rotates in the counterclockwise direction.  FIG. 17  is a diagram used to describe the operation of the substrate cleaning equipment  125 B when the substrate  100  rotates in the clockwise direction.  FIG. 18  illustrates the arrangement of cleaning liquid supply structures. 
     Referring to  FIGS. 5 and 16 through 18 , the substrate cleaning equipment  125 B according to exemplary embodiments may further include a fourth cleaning liquid supply structure  370  coupled to a swing body  320 . 
     The fourth cleaning liquid supply structure  370 , which sprays a fourth cleaning liquid  370 L, may be disposed in an area at which a YY axis of an XX-YY plane has a negative value. 
     A first cleaning liquid supply structure  340  may be disposed on a sweep line SWEEP LINE, and a second cleaning liquid supply structure  350  and the fourth cleaning liquid supply structure  370  may face each other with a buffing pad  335  interposed between them. For example, the second cleaning liquid supply structure  350  and the fourth cleaning liquid supply structure  370  may face each other with a head  330  interposed between them. 
     In  FIG. 16 , the substrate  100  may rotate in the counterclockwise direction. When the substrate  100  rotates in the counterclockwise direction, most of a first cleaning liquid  340 L moves in a first cleaning liquid flow direction  340 LF toward a rim of the substrate  100 . In addition, most of a second cleaning liquid  350 L moves in a second cleaning liquid flow direction  350 LF toward the rim of the substrate  100 . 
     On the other hand, when the fourth cleaning liquid supply structure  370  sprays the fourth cleaning liquid  370 L to a main surface  100   a  of the substrate  100 , the fourth cleaning liquid  370 L may gather at or near a center of the substrate  100 . 
     Therefore, when the substrate  100  rotates in the counterclockwise direction, the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be activated so that the first cleaning liquid  340 L and the second cleaning liquid  350 L can be sprayed onto the main surface  100   a  of the substrate  100 . On the other hand, the fourth cleaning liquid supply structure  370  may be deactivated so that the fourth cleaning liquid  370 L is not sprayed onto the main surface  100   a  of the substrate  100 . 
     In  FIG. 16 , the first cleaning liquid  340 L and the second cleaning liquid  350 L are hatched. This indicates that the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  have been activated. 
     In  FIG. 17 , the substrate  100  may rotate in the clockwise direction. When the substrate  100  rotates in the clockwise direction, most of the first cleaning liquid  340 L moves in the first cleaning liquid flow direction  340 LF toward the rim of the substrate  100 . In addition, most of the fourth cleaning liquid  370 L moves in a fourth cleaning liquid flow direction  370 LF toward the rim of the substrate  100 . 
     On the other hand, when the second cleaning liquid supply structure  350  sprays the second cleaning liquid  350 L onto the main surface  100   a  of the substrate  100 , the second cleaning liquid  350 L may gather at or near the center of the substrate  100 . 
     Therefore, when the substrate  100  rotates in the clockwise direction, the first cleaning liquid supply structure  340  and the fourth cleaning liquid supply structure  370  may be activated so that the first cleaning liquid  340 L and the fourth cleaning liquid  370 L can be sprayed onto the main surface  100   a  of the substrate  100 . On the other hand, the second cleaning liquid supply structure  350  may be deactivated so that the second cleaning liquid  350 L is not sprayed onto the main surface  100   a  of the substrate  100 . 
     In  FIG. 17 , the first cleaning liquid  340 L and the fourth cleaning liquid  370 L are hatched. This indicates that the first cleaning liquid supply structure  340  and the fourth cleaning liquid supply structure  370  have been activated. 
     Depending on the rotation direction of the substrate  100 , one of the second cleaning liquid supply structure  350  and the fourth cleaning liquid supply structure  370  may be made to spray a cleaning liquid, and the other may be made not to spray a cleaning liquid. 
       FIGS. 19 through 22  are diagrams illustrating substrate cleaning equipment  125 B according to exemplary embodiments. For ease of description, the following description will primarily focus on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     For reference,  FIG. 19  is a diagram used to describe the operation of the substrate cleaning equipment  125 B when a swing body  320  moves on a side of a substrate center line WCL.  FIG. 21  is a diagram used to describe the operation of the substrate cleaning equipment  125 B when the swing body  320  moves on the other side of the substrate center line WCL, relative to  FIG. 19 .  FIGS. 20 and 22  illustrate the arrangement of cleaning liquid supply structures. 
     Referring to  FIGS. 5 and 19 through 22 , the substrate cleaning equipment  125 B according to exemplary embodiments may further include a fourth cleaning liquid supply structure  370  and a fifth cleaning liquid supply structure  380  coupled to the swing body  320 . 
     The fourth cleaning liquid supply structure  370 , which sprays a fourth cleaning liquid  370 L, may be disposed in an area in which a YY axis of an XX-YY plane has a negative value. The fifth cleaning liquid supply structure  380 , which sprays a fifth cleaning liquid  380 L, may be disposed in an area in which an XX axis of the XX-YY plane has a negative value. 
     A first cleaning liquid supply structure  340  and the fifth cleaning liquid supply structure  380  may be disposed on a sweep line SWEEP LINE. The first cleaning liquid supply structure  340  and the fifth cleaning liquid supply structure  380  may face each other with a buffing pad  335  interposed between them. A second cleaning liquid supply structure  350  and the fourth cleaning liquid supply structure  370  may face each other with the buffing pad  335  interposed between them. 
     For example, the first cleaning liquid supply structure  340  and the fifth cleaning liquid supply structure  380  may face each other with a head  330  interposed between them, and the second cleaning liquid supply structure  350  and the fourth cleaning liquid supply structure  370  may face each other with the head  330  interposed between them. 
     When the buffing pad  335  moves along the sweep line SWEEP LINE as the substrate cleaning equipment  125 B operates, a center of the buffing pad  335 , for example, a center of the head  330 , may pass through the substrate center line WCL. While moving along the sweep line SWEEP LINE, the buffing pad  335  may pass through a first substrate edge line WEL 1  and the substrate center line WCL, and may also pass through a second substrate edge line WEL 2 . 
     For example, the movement of the swing body  320  along the sweep line SWEEP LINE may proceed from a first side R 1  to a second side R 2  of a center of the substrate  100 , for example, the substrate center line WCL. 
     The substrate  100  may rotate in the counterclockwise direction. 
     In  FIGS. 19 and 20 , when the swing body  320  moves on the first side R 1  of the substrate  100 , most of a first cleaning liquid  340 L moves in a first cleaning liquid flow direction  340 LF toward a rim of the substrate  100 . In addition, most of a second cleaning liquid  350 L moves in a second cleaning liquid flow direction  350 LF toward the rim of the substrate  100 . 
     On the other hand, when the fourth cleaning liquid supply structure  370  sprays the fourth cleaning liquid  370 L onto a main surface  100   a  of the substrate  100 , the fourth cleaning liquid  370 L may gather at or near the center of the substrate  100 . In addition, when the fifth cleaning liquid supply structure  380  sprays the fifth cleaning liquid  380 L onto the main surface  100   a  of the substrate  100 , the fifth cleaning liquid  380 L may gather at or near the center of the substrate  100 . 
     Therefore, when the swing body  320  moves on the first side R 1  of the substrate  100 , the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be activated so that the first cleaning liquid  340 L and the second cleaning liquid  350 L can be sprayed onto the main surface  100   a  of the substrate  100 . On the other hand, the fourth cleaning liquid supply structure  370  and the fifth cleaning liquid supply structure  380  may be deactivated so that the fourth cleaning liquid  370 L and the fifth cleaning liquid  380 L are not sprayed onto the main surface  100   a  of the substrate  100 . 
     In  FIG. 19 , the first cleaning liquid  340 L and the second cleaning liquid  350 L are hatched. This indicates that the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  have been activated. 
     In  FIGS. 21 and 22 , when the swing body  320  moves on the second side R 2  of the substrate  100 , most of the fourth cleaning liquid  370 L moves in a fourth cleaning liquid flow direction  370 LF toward the rim of the substrate  100 . In addition, most of the fifth cleaning liquid  380 L moves in a fifth cleaning liquid flow direction  380 LF toward the rim of the substrate  100 . 
     On the other hand, when the first cleaning liquid supply structure  340  sprays the first cleaning liquid  340 L onto the main surface  100   a  of the substrate  100 , the first cleaning liquid  340 L may gather at or near the center of the substrate  100 . In addition, when the second cleaning liquid supply structure  350  sprays the second cleaning liquid  350 L onto the main surface  100   a  of the substrate  100 , the second cleaning liquid  350 L may gather at or near the center of the substrate  100 . 
     Therefore, when the swing body  320  moves on the second side R 2  of the substrate  100 , the fourth cleaning liquid supply structure  370  and the fifth cleaning liquid supply structure  380  may be activated so that the fourth cleaning liquid  370 L and the fifth cleaning liquid  380 L can be sprayed onto the main surface  100   a  of the substrate  100 . On the other hand, the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be deactivated so that the first cleaning liquid  340 L and the second cleaning liquid  350 L are not sprayed onto the main surface  100   a  of the substrate  100 . 
     In  FIG. 21 , the fourth cleaning liquid  370 L and the fifth cleaning liquid  380 L are hatched. This indicates that the fourth cleaning liquid supply structure  370  and the fifth cleaning liquid supply structure  380  have been activated. 
       FIGS. 23 and 24  are diagrams illustrating substrate cleaning equipment according to exemplary embodiments. For ease of description, the following description will primarily focus on differences from the exemplary embodiments described with reference to  FIGS. 3 through 8 , and a further description of elements and aspects previously described may be omitted. 
     Referring to  FIGS. 23 and 24 , in the substrate cleaning equipment according to exemplary embodiments, a first cleaning liquid supply structure  340  and a second cleaning liquid supply structure  350  may face each other with a sweep line SWEEP LINE interposed between them. For example, the sweep line SWEEP LINE may extend through an area separating the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350 . 
     A connection line passing through the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350  may be defined. In  FIG. 24 , the connection line is the dashed vertical line extending through the first cleaning liquid supply structure  340  and the second cleaning liquid supply structure  350 . Although the connection line is illustrated as being substantially parallel to a substrate center line WCL in  FIG. 24 , this is merely an example used for ease of description, and exemplary embodiments are not limited to this example. 
     The sweep line SWEEP LINE may include an intersection point CP that intersects the connection line. 
     While a swing body  320  moves from a first point P 1  toward a second point P 2 , a distance from a first substrate edge line WEL 1  to the intersection point CP is greater than a distance from the first substrate edge line WEL 1  to a center of a head  330 . 
     For example, the distance from a point at which the first substrate edge line WEL 1  meets a substrate  100  to the intersection point CP is greater than the distance from the point at which the first substrate edge line WEL 1  meets the substrate  100  to the center of the head  330 . 
       FIG. 25  is a flowchart illustrating a method of fabricating a semiconductor device using substrate cleaning equipment according to exemplary embodiments. 
     Referring to  FIG. 25 , a main surface  100   a  (see  FIG. 3 ) of a substrate  100  may be planarized using a CMP process (operation S 100 ). 
     The CMP process may be performed using the CMP equipment  110  of  FIG. 1 . 
     Next, the planarized main surface  100   a  of the substrate  100  may be cleaned using substrate cleaning equipment  125 B (see  FIG. 2 ) (operation S 200 ). 
     The substrate cleaning equipment  125 B may be one of the pieces of substrate cleaning equipment described with reference to  FIGS. 3 through 24 . 
     While the present disclosure has been particularly shown and described with reference to the exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims.