Patent Publication Number: US-2020294821-A1

Title: Post cmp cleaning apparatus and post cmp cleaning methods

Description:
BACKGROUND 
     Chemical Mechanical Polishing (CMP) processes are widely used in the fabrication of integrated circuits. When an integrated circuit is built up layer by layer on the surface of a semiconductor wafer, CMP processes are used to planarize the topmost layer to provide a planar surface for subsequent steps in the fabrication process. CMP processes are carried out by polishing the wafer surface against a polishing pad. A slurry containing both abrasive particles and reactive chemicals is applied to the polishing pad. The relative movement of the polishing pad and the wafer surface coupled with the reactive chemicals in the slurry allows the CMP process to planarize or polish the wafer surface by means of both physical and chemical forces. 
     After a CMP process, the polished wafer surface is cleaned to remove CMP residue, such as organic matter and abrasive slurry particles, in order that the surface be made ready for subsequent photolithography processes and other steps in the fabrication process. In conventional post-CMP cleaning processes, brushes are used to remove the residue on the polished wafers. The brushes are typically formed of sponges. 
     Although existing apparatuses and methods for a post-CMP cleaning process have been generally adequate for their intended purposes, they have not been entirely satisfactory in all respects. Consequently, it is desirable that a solution for performing a post-CMP cleaning process be provided. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It should be noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG. 1  illustrates simplified representations of various components of a CMP system  100  according to various aspects of the present disclosure. 
         FIG. 2  schematically illustrates a perspective view of a part of a post-CMP cleaning apparatus in accordance with some embodiments of the present disclosure. 
         FIG. 3  is a diagram of a cleaning stage of the post CMP cleaning apparatus according to some embodiments of the present disclosure. 
         FIG. 4  is a top view of the cleaning stage according to some embodiments of the present disclosure. 
         FIG. 5  and  FIG. 6  are diagrams of a boundary layer resulting from different frequencies according to some embodiments of the present disclosure. 
         FIG. 7  is a flowchart of a post CMP cleaning method according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The following disclosure provides many different embodiments, or examples, for implementing different features of the subject matter provided. Specific examples of solutions and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. 
     Furthermore, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly. It should be understood that additional operations can be provided before, during, and after the method, and some of the operations described can be replaced or eliminated for other embodiments of the method. 
     The present disclosure is generally related to a post CMP cleaning apparatus and post CMP cleaning methods. More particularly, it is related to a post CMP cleaning apparatus and post CMP cleaning methods for effectively removing the particles with different sizes, so that the clean efficiency can be effectively enhanced. One challenge in existing post CMP cleaning apparatus is that the reattachment of small particles to the surfaces of the semiconductor wafer using a cleaning procedure in a contact manner. An object of embodiments of the present disclosure is to maximize the clean efficiency for different sizes of particles. 
       FIG. 1  illustrates simplified representations of various components of a CMP system  100  according to various aspects of the present disclosure. The CMP system  100  is configured to polish and clean one or more wafers. 
     The CMP system  100  includes an equipment front end module (EFEM) unit. The EFEM unit may include a plurality of front opening unified pods (FOUP) and a load/unload (L/UL) unit. The EFEM unit loads wafers into the CMP system  100  and unloads the wafers out from the CMP system  100 . 
     The CMP system  100  also includes a polishing unit. The polishing unit may include one or more polishing chambers, for example polishing chambers  120  and  121 . Each of the polishing chambers  120  and  121  may include tools such as polishing tables, polishing heads, platens, slurry delivery systems, pad conditioners, etc., for polishing one or more wafers. 
     In some embodiments, multiple wafers may be polished simultaneously. The polishing chambers  120  may also include transporters or swing transporters for transporting the wafers to and from the polishing chambers, as well as turn over wafer stations (or just turn over tools) for turning over (or flipping) the wafer (so as to polish an opposite side of the wafer). Thus, the polishing target of the polishing chambers  120  and  121  may also include a front side of wafers, a back side of wafers, as well as wafer edges. 
     In various embodiments, the wafers may be a patterned wafer or a non-patterned wafer, may contain a semiconductor material (e.g., Si or SiGe), an epitaxially grown material, a conductive material (e.g., metal), a glass material, and/or a dielectric material. The polishing processes performed by the polishing chambers  120  and  121  may be utilized in semiconductor fabrication (e.g., planar semiconductor devices or FinFET devices), light-emitting diode (LED) manufacture, liquid-crystal display (LCD) manufacture, solar device manufacture, and/or wafer packaging processes such as wafer bumping, as non-limiting examples. 
     The CMP system  100  also includes a post CMP cleaning apparatus  50 . The post CMP cleaning apparatus  50  may include a plurality of cleaning chambers, for example cleaning chambers  130 ,  131 ,  132 , and  133 . Each of the cleaning chambers  130  to  133  may include tools for cleaning and/or rinsing the wafers, for example after the wafers have been partially or completely polished. The cleaning chambers  130  to  133  may apply a liquid such as de-ionized wafer (DIW) and/or a solution to the polished wafer surface to wash away debris or other byproducts generated as a part of the wafer polishing. 
     In some embodiments, additional chemicals may be added to the DIW to facilitate the rinsing or cleaning of the wafer. Some of the cleaning chambers (such as the cleaning chamber  131 ) may also include one or more sponges that may be used to scrub the wafer surface, so as to facilitate the removal of the debris/byproduct without damaging the wafer surface. After the wafers are cleaned by the cleaning chambers  130  to  133 , they may still be transported back to the polishing chambers  120  to  121  for further polishing, depending on control instructions received from a controller. 
       FIG. 2  schematically illustrates a perspective view of a part of a post-CMP cleaning apparatus  50  in accordance with some embodiments of the present disclosure. The post-CMP cleaning apparatus  50  may include one or more cleaning chambers (cleaning stages) in  FIG. 1  and may be used to clean a semiconductor wafer W after a CMP process. More specifically, the post-CMP cleaning apparatus  50  may be used to perform a post-CMP cleaning to remove CMP residue, such as organic matter and abrasive slurry particles, from both surfaces (including the polished wafer surface and backside surface) of the semiconductor wafer W, in order that the surfaces be made ready for subsequent steps in the fabrication process. The semiconductor wafer W may be a production wafer or a test wafer made of silicon or other semiconductor materials. 
     As shown in  FIG. 2 , a cleaning stage  1  of the post-CMP cleaning apparatus  50  includes a cleaner  10  including a pair of brush rollers  10 A for performing a scrubbing process onto both surfaces of the polished semiconductor wafer W. During the scrubbing process, the semiconductor wafer W is supported by several rollers  11  (a rotating mechanism) in a horizontal orientation in a cleaning chamber (see  FIG. 1 ) which encloses the brush cleaner  10 , and is rotatable by the rollers  11  as the arrow A 1  indicated in  FIG. 2 . 
     In this embodiment, the cleaner  10  includes the pair of brush rollers  10 A, but it is not limited thereto. For example, the brush cleaner  10  may also include a soft pad or a cleaning rod. 
     The brush rollers  10 A may, for example, be porous and/or sponge like, and/or may be made of a resilient material such as polyvinyl acetate (PVA). During the scrubbing process, each brush roller  10 A is rotatably (as the arrow A 2  indicated in  FIG. 1 ) mounted on the respective spindle (not shown), and the two brush rollers  10 A may be driven by a drive mechanism  13  (for example a motor) or mechanisms to move horizontally (as the double-headed arrow A 3  indicated in  FIG. 2 ) along the diameter direction of the semiconductor wafer W and rotate/scrub over both surfaces of the semiconductor wafer W. Also, the vertical space D between the two brush rollers  10 A, related to the scrubbing force applied to the semiconductor wafer W, is adjustable by moving the brush rollers  10 A via the drive mechanism  13 . 
     The cleaning stage  1  also includes a fluid delivery unit  14  for delivering a cleaning solution CS 1  to the semiconductor wafer W via a spray unit  15 . The cleaning solution CS 1  may aid the scrubbing process performed by the cleaner  10  by washing the CMP residue from the brush rollers  10 A and/or the surfaces of the semiconductor wafer W. 
     The cleaning solution CS 1  may include various types, wherein different types of the cleaning solution CS 1  may be used to clean different CMP residue on the semiconductor wafer W. In accordance with some embodiments, the cleaning solution CS 1  includes water with no chemicals intentionally added. The cleaning solution CS 1  may also be deionized water. In alternative embodiments, the cleaning solution CS 1  includes an acid aqueous solution, which may include an organic acid such as citric acid, an inorganic acid such as HNO 3 , or the like. In yet alternative embodiments, the cleaning solution CS 1  includes an alkaline aqueous solution, which may include an organic base such as NR 3  (with R being alkyl), an inorganic base such as NH 4 OH, or the like. Surfactants such as sodium dodecyl sulfate may also be added into the cleaning solution CS 1  to reduce the surface tension thereof. The cleaning solution CS 1  may include water as a solvent. Alternatively, the cleaning solution CS 1  may use organic solvents such as methanol. The cleaning solution CS 1  may also be an aqueous solution including peroxide. For example, the cleaning solution CS 1  may include H 2 O 2  in water. 
     As shown in  FIG. 2 , the spray unit  15  includes a pair of spray bars  15 A fluidly connected to the fluid delivery unit  14 . The two spray bars  15 A are respectively adjacent to both sides of the semiconductor wafer W. Several nozzles  15 B are mounted on each spray bar  15 A for spraying the cleaning solution CS 1  onto the semiconductor wafer W. Although not shown, during the scrubbing process, the two spray bars  15 A may be driven by a drive mechanism (for example a motor) or mechanisms to rotate (to predetermined orientations) so that the cleaning solution CS 1  is accurately directed to both surfaces of the semiconductor wafer W via the nozzles  15 B. The spray bars  15 A may comprise a metal material (such as stainless steel). The nozzles  15 B may comprise ceramics, quartz, or any other anti-corrosive materials (such as plastic). 
     As shown in  FIG. 2 , the cleaning stage  1  also includes a controller  16 , and the controller  16  may be a computer system. In one example, the computer system includes a processor and a system memory component. In accordance with embodiments of the present disclosure, the computer system performs specific operations via a processor executing one or more sequences of one or more instructions contained in a system memory component. 
     The processor may include a digital signal processor (DSP), a microcontroller (MCU), and a central processing unit (CPU). The system memory component may include a random access memory (RAM) or another dynamic storage device or read only memory (ROM) or other static storage devices, for storing data and/or instructions to be executed by the processor. 
     In this embodiment, the controller  16  is coupled to the fluid delivery unit  14  and the drive mechanism  13  and configured to control their operation. For example, the controller  16  may comprise a microprocessor, and the microprocessor may be programmed to active and/or control the fluid delivery unit  14  so as to deliver the cleaning solution CS 1  to the spray unit  15  at predetermined times and/or rates, and/or for a predetermined length of time. Similarly, the microprocessor of the controller  16  may be programmed to active and/or control the drive mechanism  13  so as to move and/or rotate the brush rollers  10 A of the cleaner  10  at predetermined times and/or rates, and/or for a predetermined length of time. Although not shown, the controller  16  may also be coupled to the rollers  11  and exert similar control over the rotation of the semiconductor wafer W. 
     As the procedure of removing the CMP residue from the surfaces of the semiconductor wafer W in the cleaning stage  1  during the scrubbing process, some particles (the CMP residue) having big size (such as over 300 nm) may be removed, and some particle having small size may be still adhered to the semiconductor wafer W. In addition, the CMP residue may be adhered to and build up on the porous surface of the brush rollers  10 A, which eventually contaminates the brush rollers  10 A and render them ineffective. In some situations, the CMP residue accumulated on the brush rollers  10 A is likely to re-adhere to the semiconductor wafer W, resulting in lower cleaning quality of the post-CMP cleaning process. As a result, in order to enhance the cleaning quality of the post-CMP cleaning process, a non-contact cleaning stage is provided as the following description. 
     Please refer to  FIG. 3  and  FIG. 4 .  FIG. 3  is a diagram of a cleaning stage  2  of the post CMP cleaning apparatus  50  in  FIG. 1  according to some embodiments of the present disclosure.  FIG. 4  is a top view of the cleaning stage  2  according to some embodiments of the present disclosure. 
     As shown in  FIG. 3 , the post CMP cleaning apparatus  50  may include the cleaning stage  2 , a rotating platen  21 , a solution delivery module  23  and a vibrating device  25 . The rotating platen  21  is disposed in the cleaning stage  2 , and the rotating platen  21  is configured to hold and rotate the semiconductor wafer W. The vibrating device  25  is disposed over the rotating platen  21 , and the solution delivery module  23  is disposed near the vibrating device  25  and is configured to deliver a cleaning fluid CF to the semiconductor wafer W. 
     The vibrating device  25  is configured to provide the cleaning fluid CF with a specific frequency. For example, the specific frequency may be greater than 100 MHz while the rotating platen  21  rotating the semiconductor wafer W, so that particles (residue) on the semiconductor wafer W are removed by the cleaning fluid CF. 
     In some embodiments, the vibrating device  25  includes two or more transducers, and the controller  16  is configured to control the vibrating device  25  to generate different frequencies using different transducers. For example, the vibrating device  25  may include three transducers, and the three transducers may respectively generate a first frequency, a second frequency and a third frequency. In some embodiments, the second frequency is greater than the third frequency, and the third frequency is greater than the first frequency. In addition, for example, the first frequency ranges from 0.1 MHz to 10 MHz, the third frequency ranges from 10 MHz to 100 MHz, and the second frequency is higher than 100 MHz. For example, the second frequency may range from 100 MHz to 100 GHz. 
     As shown in  FIG. 4 , the vibrating device  25  includes a long strip-shaped housing  251 , and a length L 1  of the long strip-shaped housing  251  is substantially equal to a radius R of the semiconductor wafer W, but it is not limited thereto. For example, in other embodiments, a length of the long strip-shaped housing  251  of the vibrating device  25  may be substantially equal to a diameter DA of the semiconductor wafer W. 
     In addition, as shown in  FIG. 4 , an angle AG formed between the vibrating device  25  and the solution delivery module  23  is less than 90 degrees, so as to make it easier for the cleaning fluid CF to flow under the vibrating device  25 . 
     As shown in  FIG. 3 , it should be noted that the cleaning fluid CF is provided between the vibrating device  25  and the semiconductor wafer W. In some embodiments, the vibrating device  25  may be in contact with the cleaning fluid CF so as to provide the cleaning fluid CF with a specific frequency, and a space DS is formed between the vibrating device  25  and the semiconductor wafer W. For example, the space DS is equal to or less than 1 cm. 
     In addition, the composition of the cleaning fluid CF may be similar to the cleaning solution CS 1 , and the concentration of the cleaning fluid CF is lower than concentration of the cleaning solution CS 1 . In some embodiments, the cleaning fluid CF also includes DI water. In some embodiments, the cleaning fluid CF may include DI water and dissolved gases, such as H 2 , N 2 , CO 2 , O 3 , Ar and He. In some embodiments, chemicals (such as DHF, NH 4 OH, H 2 O 2 , SC1, SC2, SPM) can also be included in the cleaning fluid CF. 
     Please refer to  FIG. 5  and  FIG. 6 .  FIG. 5  and  FIG. 6  are diagrams of a boundary layer resulting from different frequencies according to some embodiments of the present disclosure. In some embodiments, when the vibrating device  25  provides the cleaning fluid CF with different frequencies, a boundary layer resulting from the cleaning fluid CF may be changed. 
     For example, as shown in  FIG. 5 , the frequency provided by the vibrating device  25  is about 10 MHz, and the acoustic streaming is illustrated by the arrows in  FIG. 5 . In this embodiment, a boundary layer BL 1  resulting from the cleaning fluid CF is on the semiconductor wafer W. In addition, a first particle PT 1  and a second particle PT 2  is adhered to the surface of the semiconductor wafer W. The first particle PT 1  has a diameter DP 1 , the second particle PT 2  has a diameter DP 2 , and the diameter DP 1  is greater than diameter DP 2 . 
     In this situation, the cleaning fluid CF will provide a drag force through the acoustic streaming to the first particle PT 1  and the second particle PT 2 . As shown in  FIG. 5 , since the boundary layer BL 1  is smaller than the diameter DP 1 , the acoustic streaming of the cleaning fluid CF can provide sufficient drag force to the first Particle PT 1 . That is, the drag force provided by the cleaning fluid CF is greater than an adhesion force between the first particle PT 1  and the semiconductor wafer W. 
     However, the drag force provided by the acoustic streaming of the cleaning fluid CF at this time is not sufficient to drag the second particle PT 2 . That is, the drag force provided by the cleaning fluid CF is smaller than an adhesion force between the second particle PT 2  and the semiconductor wafer W. In this embodiment, the diameter DPI ranges from 50 to 130 nm, and the diameter DP 2  may be smaller than 30 nm. 
     In order to remove the second particle PT 2 , as shown in  FIG. 6 , the frequency provided by the vibrating device  25  may be modified to be over 100 MHz, and a boundary layer BL 2  resulting from the cleaning fluid CF is on the semiconductor wafer W. In this embodiment, the boundary layer BL 2  is smaller than the boundary layer BL 1  and is also smaller than the diameter DP 2  of the second particle PT 2  and than the diameter DP 1  of the first particle PT 1 . Therefore, the drag force provided by the acoustic streaming of the cleaning fluid CF is greater than the adhesion force between the second particle PT 2  and the semiconductor wafer W and the adhesion force between the first particle PT 1  and the semiconductor wafer W. That is, the acoustic streaming of the cleaning fluid CF can provide sufficient drag force to the first particle PT 1  and the second particle PT 2 , so as to remove the first particle PT 1  and the second particle PT 2  from the semiconductor wafer W. 
     A table  200  shown below is exemplary relations between the frequency, the boundary layer and the streaming velocity of the cleaning fluid CF. When the frequency provided to the cleaning fluid CF increases, the boundary layer becomes smaller, and the streaming velocity becomes greater, so as to provide sufficient drag force to the particles on the semiconductor wafer W. In addition, the intensity is proportional to streaming velocity. 
     
       
         
           
               
               
               
             
               
                 TABLE 200 
               
               
                   
               
               
                 Frequency 
                 Boundary Layer Thickness 
                 Streaming Velocity 
               
               
                 (MHz) 
                 (nm) 
                 (m/s) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                 0.1 
                 1356 
                 2.07E−07 
               
               
                 0.2 
                 959 
                 8.28E−07 
               
               
                 1 
                 429 
                 2.07E−05 
               
               
                 10 
                 136 
                 2.07E−03 
               
               
                 20 
                 96 
                 8.28E−03 
               
               
                 30 
                 78 
                 1.86E−02 
               
               
                 50 
                 61 
                 5.18E−02 
               
               
                 100 
                 43 
                 0.2 
               
               
                 250 
                 27 
                 1.3 
               
               
                 300 
                 25 
                 1.9 
               
               
                 380 
                 22 
                 3.0 
               
               
                 400 
                 21 
                 3.3 
               
               
                 500 
                 19 
                 5.2 
               
               
                 1000 
                 14 
                 20.7 
               
               
                   
               
            
           
         
       
     
     Please refer to  FIG. 7 , which is a flowchart of a post CMP cleaning method  300  according to some embodiments of the present disclosure. 
     The method  300  includes operation  302 , in which the semiconductor wafer W is cleaned at a first cleaning stage. In some embodiments, the first cleaning stage may be the cleaning stage  1 , and the semiconductor wafer W can be cleaned in a contact manner. 
     For example, as shown in  FIG. 2 , the semiconductor wafer W is disposed at the cleaning stage  1  and is supported by the rollers  11 , and then the semiconductor wafer W is rotated by the rollers  11 . Then, the cleaning solution CS 1  is provided to surfaces of the semiconductor wafer W by the fluid delivery unit  14 . After that, the brush cleaner (including two brush rollers  10 A) is provided to scrub the surfaces of the semiconductor wafer W, so that some particles having a large diameter (for example, over 80 nm) on the semiconductor wafer W can be removed. 
     In some embodiments, the first cleaning stage may be the cleaning stage  2 , and the semiconductor wafer W can be cleaned in a non-contact manner. For example, as shown in  FIG. 3  and  FIG. 4 , the semiconductor wafer W is disposed at the cleaning stage  2 , and then the semiconductor wafer W is held and rotated by a first rotating platen (such as the rotating platen  21 ) in the cleaning stage  2 . Then, the cleaning fluid CF is provided to a surface of the semiconductor wafer W by the solution delivery module  23 . 
     After that, the controller  16  controls the vibrating device  25  to provide the cleaning fluid CF with a first frequency while rotating the semiconductor wafer W, so that some particles on the semiconductor wafer W are removed by the cleaning fluid CF. In this embodiment, the first frequency may range from 0.1 MHz to 10 MHz. 
     The method  300  also includes operation  304  in which the semiconductor wafer W is cleaned at a middle cleaning stage in a contact manner or a non-contact manner after the cleaning procedure of cleaning the semiconductor wafer W at the first cleaning stage. 
     For example, after the cleaning procedure in the first cleaning stage (the cleaning stage  1  or the cleaning stage  2 ), the semiconductor wafer W is transported to the middle cleaning stage. In this embodiment, the middle cleaning stage may be another stage which is similar to the cleaning stage  2 . The semiconductor wafer W is rotated by a middle rotating platen (similar to the rotating platen  21 ) in the middle cleaning stage. The controller  16  may control the vibrating device  25  to provide the cleaning fluid CF with another frequency (a third frequency) while rotating the semiconductor wafer W, so that particles having a medium diameter (such as 50˜130 nm) can be removed by the cleaning fluid CF. In this situation, the third frequency may range from 10 to 100 MHz and is greater than the first frequency. 
     For example, in some embodiments, after the cleaning procedure in the first cleaning stage (the cleaning stage  1  or the cleaning stage  2 ), the semiconductor wafer W is transported to the middle cleaning stage and the middle cleaning stage is similar to the cleaning stage  1 . The semiconductor wafer W is supported and rotated by another rotating mechanism (similar to the rollers  11 ) in the middle cleaning stage. Then, the cleaning solution CS 1  is provided to surfaces of the semiconductor wafer W by the fluid delivery unit  14 . After that, a cleaner (similar to the brush rollers  10 A) is provided to contact the surface of the semiconductor wafer W, so that the particles having a medium diameter can be removed by the cleaner. 
     The method  300  also includes operation  306  in which the semiconductor wafer W is cleaned at a second cleaning stage. After the cleaning procedure of cleaning the semiconductor wafer W at the middle cleaning stage in a contact manner or a non-contact manner, the semiconductor wafer W is transported to the second cleaning stage, and the second cleaning stage is similar to the cleaning stage  2 . 
     At the second cleaning stage, the semiconductor wafer W is rotated by a second rotating platen (similar to the rotating platen  21 ) in the second cleaning stage while providing the cleaning fluid CF to the surface of the semiconductor wafer W. Then, the controller  16  may control the vibrating device  25  to provide the cleaning fluid CF with frequency (a second frequency) while rotating the semiconductor wafer W, so that some particles having a small diameter (such as being smaller than 30 nm) on the semiconductor wafer W can be removed by the cleaning fluid CF. In this embodiment, the second frequency may be greater than 100 MHz, for example, it may range from 100 MHz to 100 GHz. 
     In this embodiment, the second frequency is greater than the first frequency, the second frequency is greater than the third frequency, and the third frequency is greater than the first frequency. 
     Embodiments of the present disclosure can provide a post CMP cleaning apparatus and post CMP cleaning methods for cleaning particles (the CMP residue). The post CMP cleaning apparatus may include at least one cleaning stage for cleaning the semiconductor wafer W in a contact manner. In addition, the post CMP cleaning apparatus may also include at least one cleaning stage for cleaning the semiconductor wafer W in a non-contact manner. 
     The two or more cleaning stages are cascade in sequence, to remove the particles with different sizes, so as to effectively remove the particles with different sizes. Therefore, based on the design of the post CMP cleaning apparatus and the post CMP cleaning methods of the present disclosure, the clean efficiency can be effectively enhanced. 
     In accordance with some embodiments, a post CMP cleaning apparatus is provided. The post CMP cleaning apparatus includes a cleaning stage. The post CMP cleaning apparatus also includes a rotating platen disposed in the cleaning stage, and the rotating platen is configured to hold and rotate a semiconductor wafer. The post CMP cleaning apparatus further includes a vibrating device disposed over the rotating platen. The post CMP cleaning apparatus further includes a solution delivery module disposed near the vibrating device and configured to deliver a cleaning fluid to the semiconductor wafer. The vibrating device is configured to provide the cleaning fluid with a specific frequency which is at least greater than 100 MHz while the rotating platen is rotating the semiconductor wafer, so that particles on the semiconductor wafer are removed by the cleaning fluid. 
     In accordance with some embodiments, a post CMP cleaning method is provided. The method includes rotating a semiconductor wafer by a first rotating platen in a first cleaning stage. The method further includes providing a cleaning fluid to a surface of the semiconductor wafer. The method further includes controlling a vibrating device to provide the cleaning fluid with a first frequency while rotating the semiconductor wafer, so that particles on the semiconductor wafer are removed by the cleaning fluid. The method also includes disposing the semiconductor wafer at a second cleaning stage after controlling the vibrating device to provide the cleaning fluid with the first frequency. In addition, the method includes rotating the semiconductor wafer by a second rotating platen in the second cleaning stage while providing the cleaning fluid to the surface of the semiconductor wafer. Moreover, the method also includes controlling the vibrating device to provide the cleaning fluid with a second frequency while rotating the semiconductor wafer, so that particles on the semiconductor wafer are removed by the cleaning fluid, and the second frequency is greater than the first frequency. 
     In accordance with some embodiments, a post CMP cleaning method is provided. The method includes rotating a semiconductor wafer by a rotating mechanism in a first cleaning stage. The method further includes providing a cleaning solution to a surface of the semiconductor wafer. The method further includes providing a brush cleaner to scrub the surface of the semiconductor wafer, so that particles on the semiconductor wafer are removed. The method also includes disposing the semiconductor wafer at a second cleaning stage after providing the brush cleaner to scrub the surface of the semiconductor wafer. In addition, the method includes rotating the semiconductor wafer by a rotating platen in the second cleaning stage. Moreover, the method also includes providing a cleaning fluid to the surface of the semiconductor wafer. The method also includes controlling a vibrating device to provide the cleaning fluid with a second frequency while rotating the semiconductor wafer, so that particles on the semiconductor wafer are removed by the cleaning fluid. 
     Although the embodiments and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the spirit and scope of the embodiments as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods, and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps. In addition, each claim constitutes a separate embodiment, and the combination of various claims and embodiments are within the scope of the disclosure.