Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a conveying method for cleaning a wafer after CMP, which can improve the cleaning speed of the wafer after CMP and meet the requirement of wafer capacity.
In order to achieve the purpose, the invention adopts the technical scheme that: a carrying method for cleaning a wafer after CMP comprises the following steps:
step S01, the cross-connecting unit receives the wafer after CMP and performs pre-cleaning;
step S02, the double manipulators convey the first wafer in the transfer unit to the first cleaning unit for first cleaning; wherein the first cleaning time is 110-130 seconds;
step S03, the double manipulators convey the first wafer after the first cleaning to a second cleaning unit for second cleaning; wherein the time for the second cleaning is 170-190 seconds;
step S04, returning the double manipulators to the transfer unit, and conveying the second wafer in the transfer unit to the first cleaning unit for first cleaning;
step S05, after the second wafer is cleaned in the first cleaning unit, moisturizing and waiting, and then the second wafer enters a second cleaning unit before the first wafer is cleaned for the second time;
step S06, after the positions of a first wafer and a second wafer are exchanged by the two manipulators, the second wafer is cleaned in a second cleaning unit, and the first wafer is sent into a wafer box of the loading table through the two manipulators;
and S07, repeating the steps S02-S06 in sequence, putting the wafers into the wafer boxes of the loading platform in sequence, and taking the wafer boxes by a subsequent manipulator when the number of the wafers meets the requirement.
Furthermore, a temporary storage unit is arranged between the second cleaning unit and the loading platform and used for temporarily storing cleaned wafers which cannot be placed on the loading platform.
Further, in step S01, the pre-cleaning is to immerse the CMP wafer in ozone water with two pieces as a group, and then perform ultrasonic cleaning to ensure that the wafer is in a wet state.
Further, the cleaning process of the first cleaning unit is as follows: when the brush rotates, the wafer is brushed by pure water and alkaline liquid medicine in sequence.
Further, the cleaning process of the second cleaning unit is as follows: and the nozzle sprays ozone and acidic liquid medicine to the wafer in sequence, and finally the wafer is dried by spin.
Furthermore, two clamping jaws which are arranged up and down are arranged on the two manipulators and are respectively used for clamping wafers in a wet state and a dry state.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the carrying method for wafer CMP post-cleaning, provided by the scheme of the invention, the wafer is clamped by the double manipulators, so that the next wafer can be moved to the cleaning position of the previous wafer before the previous wafer is cleaned, the positions of the two wafers are exchanged, and then the previous wafer is conveyed to a subsequent station, so that the carrying time of the wafer can be effectively reduced, the productivity is improved, the cleaning efficiency is improved, and the requirement for wafer batch cleaning is met.
Detailed Description
In order to make the content of the present invention more comprehensible, the following description is further described with reference to the accompanying drawings, and it goes without saying that the present invention is not limited to the specific embodiments, and general alternatives known to those skilled in the art are also included in the scope of the present invention.
Example one
Referring to fig. 1, the method for transporting a wafer after CMP according to an embodiment of the present invention includes a transfer unit 1, a first cleaning unit 2, a second cleaning unit 3, a dual robot 4, and a loading table 6.
Specifically, the cross-connecting unit 1 mainly has a cross-connecting function with a wafer after CMP in a previous process, receives the wafer after CMP, and pre-cleans the wafer; the pre-cleaning operation process comprises the steps of soaking the wafer in ozone water and cleaning the wafer through ultrasonic waves, wherein the wafer is soaked in the ozone water in a group of two wafers, and meanwhile, the wafer can be ensured to be in a wet state.
Wherein, the cleaning process of the first cleaning unit is as follows: when the brush rotates, the wafer is scrubbed by pure water and alkaline liquid medicine in sequence; the cleaning process of the second cleaning unit is as follows: and the nozzle sprays ozone and acidic liquid medicine to the wafer in sequence, and finally the wafer is dried by spin.
The double mechanical arm 4 comprises two clamping jaws which are arranged up and down, the clamping jaw which is positioned above is used for clamping a wafer in a dry state, the clamping jaw which is positioned below is used for clamping a wafer in a wet state, the double mechanical arm 4 is used for carrying the wafer among the transfer unit 1, the first cleaning unit 2, the second cleaning unit 3 and the loading platform 6, and only the wafer cleaned by the second cleaning unit 3 needs to be clamped by the clamping jaw which is used for clamping the wafer in the dry state.
The loading platform 6 is located at the rear end of the second cleaning unit, and a wafer cassette is arranged on the loading platform 6 and used for placing cleaned wafers, in this embodiment, 23 wafers can be placed in one wafer cassette, and when 23 wafers are taken away by a manipulator in a subsequent process.
The embodiment discloses a carrying method for cleaning a wafer after CMP.
Referring to fig. 1, in step S01, the wafer after CMP is received by the interface unit, and the wafer is immersed in ozone water in a group of two wafers and cleaned by ultrasonic waves to ensure that the wafer is in a wet state.
In step S02, the double robot transfers the first wafer 10 in the transfer unit to the first cleaning unit, and cleans the brush with pure water and alkaline chemical for 110 seconds.
Step S03, the double manipulators transport the first wafer 10 after the first cleaning to the second cleaning unit, and spin-dry the wafer after the nozzle is matched with the ozone and the acidic solution, which takes 170 seconds.
Referring to FIG. 2:
in step S04, the robot returns to the transfer unit, and transfers the second wafer 20 in the transfer unit to the first cleaning unit to perform the first cleaning for 110 seconds, and the first wafer 10 is cleaned in the second cleaning unit at this time.
Please refer to fig. 3: in step S05, since the time for cleaning the first wafer 10 in the second cleaning unit is longer than the time for cleaning the second wafer 20 in the second cleaning unit, after the second wafer 20 is cleaned in the first cleaning unit, the second wafer 20 is kept moisture in the first cleaning unit, and then the second wafer 20 enters the second cleaning unit before the first wafer 10 is cleaned for the second time.
Step S06, after the positions of the first wafer and the second wafer are exchanged, the two manipulators pick up the first wafer 10 in the second cleaning unit by the clamping jaws in the dry state, and then pick up the second wafer 20 in the second cleaning unit by the clamping jaws in the wet state, and the first wafer 10 is sent into the wafer box of the loading platform.
And S07, repeating the steps S02-S06 in sequence, putting the cleaned wafers into the wafer boxes of the loading table in sequence, and taking the wafer boxes filled with 23 wafers away by a subsequent manipulator when the number of the wafers in the wafer boxes reaches 23.
Example two
The invention discloses a carrying method for cleaning a plurality of wafers after CMP, which comprises the following steps:
in step S01, the interface unit receives the CMP wafer and moisturizes the wafer.
In step S02, the double robot transfers the first wafer 10 in the transfer unit to the first cleaning unit, and cleans the brush with pure water and alkaline chemical for 130 seconds.
Step S03, the double manipulators transport the first wafer 10 after the first cleaning to the second cleaning unit, and spin-dry the wafer after the nozzle is matched with the ozone and the acidic solution, which takes 190 seconds.
In step S04, the robot returns to the transfer unit, and transfers the second wafer 20 in the transfer unit to the first cleaning unit to perform the first cleaning for 130 seconds, and the first wafer 10 is cleaned in the second cleaning unit at this time.
Step S05, after the second wafer 20 is cleaned in the first cleaning unit, the second wafer 20 is kept moist in the first cleaning unit, and then the second wafer 20 enters the second cleaning unit before the first wafer 10 is cleaned for the second time.
Step S06, after the positions of the first wafer 10 and the second wafer 20 are exchanged, the two manipulators pick up the first wafer 10 in the second cleaning unit by the gripping jaws in the dry state, and then pick up the second wafer 20 in the second cleaning unit by the gripping jaws in the wet state, and the first wafer 10 is sent to the cassette of the loading platform.
And S07, repeating the steps S02-S06 in sequence, putting the cleaned wafers into the wafer boxes of the loading table in sequence, and taking the wafer boxes filled with 21 wafers away by a subsequent manipulator when the number of the wafers in the wafer boxes reaches 21.
EXAMPLE III
Referring to fig. 4, the difference between the first embodiment and the second embodiment is that a temporary storage unit 5 is further installed between the loading platform and the second cleaning unit for storing the wafers that cannot be cleaned by the second cleaning unit 4.
The invention discloses a carrying method for cleaning a plurality of wafers after CMP, which comprises the following steps:
in step S01, the interface unit receives the CMP wafer and moisturizes the wafer.
In step S02, the double robot transfers the first wafer in the transfer unit to the first cleaning unit, and cleans the brush with pure water and alkaline chemical for 120 seconds.
And step S03, the double manipulators convey the first wafer after the first cleaning to a second cleaning unit, spray-clean the first wafer by matching the nozzles with ozone and acidic liquid medicine, and spin-dry the first wafer, wherein the process needs 180 seconds.
In step S04, the double robot returns to the transfer unit, and transfers the second wafer in the transfer unit to the first cleaning unit to perform the first cleaning for 120 seconds, and the first wafer is cleaned in the second cleaning unit at this time.
Step S05, after the second wafer is cleaned in the first cleaning unit, continuing to moisturize in the first cleaning unit, and then the second wafer enters the second cleaning unit before the first wafer is cleaned for the second time.
Step S06, after the positions of the first wafer and the second wafer are exchanged, the clamping jaws in the dry state are used to take out the first wafer in the second cleaning unit, then the clamping jaws in the wet state are used to place the second wafer in the second cleaning unit for cleaning, and the first wafer is sent into the wafer box of the loading platform.
And S07, repeating the steps S02-S06 in sequence, putting the cleaned wafers into the wafer boxes of the loading table in sequence, and taking the wafer boxes filled with 25 wafers away by a subsequent manipulator when the number of the wafers in the wafer boxes reaches 25.
Step S08, when the wafer can not be placed into the wafer cassette after the cleaning, the wafer is temporarily stored in the temporary storage unit for moisture preservation, so as to be subsequently transferred to the loading platform.
According to the carrying method for wafer CMP post-cleaning, the double manipulators are adopted for clamping the wafer, so that the next wafer can be moved to the cleaning position of the previous wafer before the previous wafer is cleaned, the positions of the two wafers are exchanged, and the previous wafer is sent to the subsequent station, so that the carrying time of the wafer can be effectively reduced, the productivity is improved, the cleaning efficiency is improved, and the requirement for wafer batch cleaning is met.
The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.