JP2009100001A - Cmp method, cmp device, and semiconductor device and manufacturing method thereof - Google Patents

Cmp method, cmp device, and semiconductor device and manufacturing method thereof Download PDF

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JP2009100001A
JP2009100001A JP2008306741A JP2008306741A JP2009100001A JP 2009100001 A JP2009100001 A JP 2009100001A JP 2008306741 A JP2008306741 A JP 2008306741A JP 2008306741 A JP2008306741 A JP 2008306741A JP 2009100001 A JP2009100001 A JP 2009100001A
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polishing
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film thickness
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JP4924593B2 (en
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Takehiro Masumura
岳大 桝村
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Seiko Epson Corp
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<P>PROBLEM TO BE SOLVED: To provide a CMP method by which an accurate target film thickness is obtained through a single polishing process. <P>SOLUTION: The CMP method includes the processes of: predicting polishing time from a polishing rate measured with a monitor wafer, the initial film thickness of some product wafers sampled from a plurality of product wafers, and a target film thickness after polishing; polishing some of product wafers for the polishing time; measuring film thickness after polishing, and deriving shortage polishing time required for the target film thickness; deriving ideal polishing time from the shortage polishing time and the predicted polishing time; and polishing the rest of product wafers left after sampling some wafers for the ideal polishing time. After or in the middle of the polishing processes, the polishing rate and the ideal polishing time of the monitor wafers are stored as data, and a plurality of data on polishing rate and ideal polishing time are further stored by repeating the above processes. A relationship between the polishing rate and the ideal polishing time is derived from the plurality of data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ＣＭＰ研磨方法、ＣＭＰ装置、半導体装置及びその製造方法に関する。特には、１回の研磨処理によって正確な狙い膜厚が得られるＣＭＰ研磨方法、ＣＭＰ装置、半導体装置及びその製造方法に関する。   The present invention relates to a CMP polishing method, a CMP apparatus, a semiconductor device, and a manufacturing method thereof. In particular, the present invention relates to a CMP polishing method, a CMP apparatus, a semiconductor device, and a manufacturing method thereof that can obtain an accurate target film thickness by a single polishing process.

従来のＣＭＰ装置はターンテーブルを有しており、このターンテーブルは回転モータによって回転可能に構成されている。ターンテーブルの上面上には研磨クロスが貼り付けられている。ターンテーブルの上方にはウエハ保持手段である研磨ヘッドが配置されており、この研磨ヘッドは回転モータによって回転可能に構成されている。また、ターンテーブルの上方にはスラリーを吐出するノズルが配置されている。また、このＣＭＰ装置は、研磨時間、ターンテーブルの回転数、研磨ヘッドの回転などを制御する制御部を有している。   A conventional CMP apparatus has a turntable, and this turntable is configured to be rotatable by a rotary motor. A polishing cloth is affixed on the upper surface of the turntable. A polishing head as wafer holding means is disposed above the turntable, and this polishing head is configured to be rotatable by a rotary motor. A nozzle that discharges slurry is disposed above the turntable. The CMP apparatus also has a controller that controls the polishing time, the number of rotations of the turntable, the rotation of the polishing head, and the like.

上記ＣＭＰ装置を用いて次のように研磨する。
１ロットには２５枚の製品用ウエハが含まれており、製品用ウエハの研磨はロット単位で行う。まず、研磨レートを測定するために、モニター用ウエハを準備する。このモニター用ウエハには、製品用ウエハで研磨しようとしている膜（例えばシリコン酸化膜など）が全面に成膜されている。次いで、モニター用ウエハの研磨前の膜厚（初期膜厚）を測定し、所定時間研磨を行う。即ち、研磨ヘッドの下部にモニター用ウエハの裏面を真空保持し、ターンテーブルを所定の回転数で矢印の方向に回転させ、ノズルからスラリーを吐出し、そのスラリーを研磨クロスの中央付近に滴下し、回転モータによって研磨ヘッドを所定の回転数で矢印の方向に回転させ、モニター用ウエハの表面（研磨面）を研磨クロスに押圧し、さらに研磨ヘッドによってウエハの裏面にエアー圧をかけて押圧する。このようにしてモニター用ウエハを所定時間研磨する。そして、研磨後の膜厚を測定し、初期膜厚と研磨後の膜厚と研磨時間から研磨レートを導出する。 Polishing is performed using the CMP apparatus as follows.
One lot includes 25 product wafers, and the product wafers are polished on a lot basis. First, in order to measure the polishing rate, a monitor wafer is prepared. A film (for example, a silicon oxide film) to be polished by the product wafer is formed on the entire surface of the monitor wafer. Next, the film thickness (initial film thickness) of the monitor wafer before polishing is measured and polished for a predetermined time. That is, the back surface of the monitor wafer is held under vacuum at the bottom of the polishing head, the turntable is rotated in the direction of the arrow at a predetermined number of revolutions, the slurry is discharged from the nozzle, and the slurry is dropped near the center of the polishing cloth. The polishing head is rotated in the direction of the arrow at a predetermined number of rotations by a rotation motor, the surface (polishing surface) of the monitor wafer is pressed against the polishing cloth, and the back surface of the wafer is pressed by the polishing head by applying air pressure. . In this way, the monitor wafer is polished for a predetermined time. Then, the film thickness after polishing is measured, and the polishing rate is derived from the initial film thickness, the film thickness after polishing, and the polishing time.

次に、２５枚の製品用ウエハには２回に分けて上記ＣＭＰ装置を用いて研磨を行う。まず、１回目の研磨で、２５枚の製品用ウエハに所望の膜厚より少し厚くなる程度まで研磨を行った後、研磨後の膜厚を測定する。次いで、この測定した研磨後の膜厚と研磨レートから２回目の研磨を行う際の研磨時間を導出する。この後、この導出した研磨時間の研磨を２５枚の製品用ウエハに対して行う。１回目の研磨と２回目の研磨の両方において研磨時間以外の研磨条件は同一とする。このようにして研磨を行った後、２５枚の製品用ウエハのうちの１枚又は２枚について研磨後の膜厚を測定し、所望の膜厚となっていることを確認する。これにより、２５枚の製品用ウエハの研磨を終了する。   Next, the 25 product wafers are polished twice using the CMP apparatus. First, in the first polishing, 25 product wafers are polished to a degree slightly thicker than a desired film thickness, and then the film thickness after polishing is measured. Next, a polishing time for performing the second polishing is derived from the measured film thickness after polishing and the polishing rate. Thereafter, the polishing for the derived polishing time is performed on 25 product wafers. The polishing conditions other than the polishing time are the same in both the first polishing and the second polishing. After polishing in this way, the film thickness after polishing is measured for one or two of the 25 product wafers, and it is confirmed that the desired film thickness is obtained. Thus, the polishing of the 25 product wafers is completed.

上述したように２回に分けて研磨処理を行うことにより、研磨後の膜が狙い膜厚になるように合わせ込んでいた。しかし、２回に分けて研磨処理を行うと、１回で研磨処理を終了させる場合に比べて処理工程が多くなるので、処理の遅延により生産能力が低下するという問題があった。   As described above, by performing the polishing process in two steps, the film after polishing was adjusted so as to have a target film thickness. However, when the polishing process is performed in two steps, the number of processing steps is increased as compared with the case where the polishing process is completed once, so that there is a problem in that the production capacity is reduced due to a delay in the processing.

本発明は上記のような事情を考慮してなされたものであり、その目的は、１回の研磨処理によって正確な狙い膜厚が得られるＣＭＰ研磨方法、ＣＭＰ装置、半導体装置及びその製造方法を提供することにある。   The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a CMP polishing method, a CMP apparatus, a semiconductor device, and a manufacturing method thereof that can obtain an accurate target film thickness by a single polishing process. It is to provide.

上記課題を解決するため、本発明に係るＣＭＰ研磨方法は、モニター用ウエハで研磨レートを測定する第１工程と、
複数の製品用ウエハから一部を抜き取り、抜き取った一部の製品用ウエハの初期膜厚を測定し、前記初期膜厚と研磨後の狙い膜厚と前記研磨レートから研磨時間を導出する第２工程と、
前記一部の製品用ウエハに対して前記研磨時間の研磨処理を行う第３工程と、
前記第３工程での研磨処理後の膜厚を測定し、前記膜厚と狙い膜厚から研磨不足時間を導出する第４工程と、
前記研磨不足時間と前記第２工程で導出した研磨時間とから理想研磨時間を導出する第５工程と、
前記第２工程で一部が抜き取られた製品用ウエハの残りを前記理想研磨時間で研磨処理する第６工程と、
を具備する。 In order to solve the above problems, a CMP polishing method according to the present invention includes a first step of measuring a polishing rate with a monitor wafer,
Secondly, a part is extracted from a plurality of product wafers, an initial film thickness of a part of the extracted product wafers is measured, and a polishing time is derived from the initial film thickness, a target film thickness after polishing, and the polishing rate. Process,
A third step of performing a polishing process for the polishing time on the partial product wafer;
Measuring the film thickness after the polishing process in the third step, and deriving the polishing shortage time from the film thickness and the target film thickness;
A fifth step of deriving an ideal polishing time from the polishing shortage time and the polishing time derived in the second step;
A sixth step of polishing the remainder of the product wafer partially extracted in the second step with the ideal polishing time;
It comprises.

上記ＣＭＰ研磨方法によれば、第１工程から第５工程で理想研磨時間を導出することにより、従来のＣＭＰ研磨方法のように２回に分けて研磨処理を行う必要が無くなる上、終点検出機能を用いることなく研磨終点を正確に制御することができ、１回の研磨処理によって正確な狙い膜厚に研磨することができる。   According to the CMP polishing method, by deriving the ideal polishing time from the first step to the fifth step, it is not necessary to perform the polishing process in two steps as in the conventional CMP polishing method, and the end point detection function It is possible to accurately control the polishing end point without using a film, and it is possible to polish to an accurate target film thickness by a single polishing process.

また、本発明に係るＣＭＰ研磨方法においては、前記第６工程の後又は前記第１工程乃至第６工程の途中で、前記第１工程で測定した研磨レートと前記第５工程で導出した理想研磨時間をデータとして保存し、前記第１工程乃至第６工程を繰り返し行うことにより研磨レートと理想研磨時間のデータを複数保存し、これら複数のデータから研磨レートと理想研磨時間の関係を導く第７工程をさらに具備することも可能である。   In the CMP polishing method according to the present invention, after the sixth step or in the middle of the first to sixth steps, the polishing rate measured in the first step and the ideal polishing derived in the fifth step. The time is stored as data, and a plurality of data of the polishing rate and the ideal polishing time are stored by repeatedly performing the first to sixth steps, and the relationship between the polishing rate and the ideal polishing time is derived from the plurality of data. It is possible to further include a process.

また、本発明に係るＣＭＰ研磨方法においては、前記第７工程の後に、モニター用ウエハで研磨レートを測定し、この測定した研磨レートと前記第７工程で導いた関係から、現在の装置状態での理想研磨時間を導出し、前記理想研磨時間で製品用ウエハの研磨処理を行う第８工程をさらに具備することも可能である。第７工程で研磨レート（マシンコンディション）と理想研磨時間の関係を得ることにより、モニター用ウエハで研磨レートを測定しただけで現在の装置状態の理想研磨時間を導出できるため、第２工程乃至第４工程を省略しても１回の研磨処理によって正確な狙い膜厚に研磨することが可能となる。   Further, in the CMP polishing method according to the present invention, after the seventh step, the polishing rate is measured with the monitor wafer, and the relationship between the measured polishing rate and the seventh step leads to the current apparatus state. It is also possible to further include an eighth step of deriving the ideal polishing time and polishing the product wafer with the ideal polishing time. By obtaining the relationship between the polishing rate (machine condition) and the ideal polishing time in the seventh step, the ideal polishing time of the current apparatus state can be derived simply by measuring the polishing rate with the monitor wafer. Even if the four steps are omitted, it is possible to polish to an accurate target film thickness by a single polishing process.

本発明に係る半導体装置は、前記のＣＭＰ研磨方法を用いて研磨した工程を経て製造されたものである。
本発明に係る半導体装置の製造方法は、前記のＣＭＰ研磨方法を用いて研磨する工程を有するものである。 The semiconductor device according to the present invention is manufactured through a polishing process using the CMP polishing method.
A method for manufacturing a semiconductor device according to the present invention includes a step of polishing using the CMP polishing method.

本発明に係るＣＭＰ装置は、ウエハをＣＭＰ研磨するＣＭＰ装置であって、
回転可能に構成されたターンテーブルと、
前記ターンテーブル上に配置された研磨クロスと、
前記研磨クロス上にスラリーを供給するスラリー供給機構と、
前記ウエハを保持しながら前記研磨クロスに該ウエハを押し当てる研磨ヘッドと、
前記研磨ヘッド及び前記ターンテーブルの動作を制御する制御部と、
を具備するＣＭＰ装置において、
前記制御部は、モニター用ウエハで研磨レートを測定し、複数の製品用ウエハから一部を抜き取り、抜き取った一部の製品用ウエハの初期膜厚を測定し、前記初期膜厚と研磨後の狙い膜厚と前記研磨レートから研磨時間を導出し、前記一部の製品用ウエハに対して前記研磨時間の研磨処理を行い、研磨処理後の膜厚を測定し、前記膜厚と狙い膜厚から研磨不足時間を導出し、前記研磨不足時間と前記研磨時間とから理想研磨時間を導出し、前記理想研磨時間と前記研磨レートをデータとして保存し、これらのデータを複数収集することにより研磨レートと理想研磨時間の関係を導出し、この関係から、モニター用ウエハで研磨レートを測定するだけで現在の装置状態での理想研磨時間を導出し、この理想研磨時間で製品用ウエハを研磨するように制御する。 A CMP apparatus according to the present invention is a CMP apparatus for CMP polishing a wafer,
A turntable configured to be rotatable,
A polishing cloth disposed on the turntable;
A slurry supply mechanism for supplying slurry onto the polishing cloth;
A polishing head for pressing the wafer against the polishing cloth while holding the wafer;
A control unit for controlling operations of the polishing head and the turntable;
In a CMP apparatus comprising:
The control unit measures a polishing rate with a monitor wafer, extracts a part from a plurality of product wafers, measures an initial film thickness of the extracted product wafers, The polishing time is derived from the target film thickness and the polishing rate, the polishing process is performed on the part of the product wafers, the film thickness after the polishing process is measured, and the film thickness and the target film thickness are measured. Deriving the polishing undertime from the above, deriving the ideal polishing time from the underpolishing time and the polishing time, storing the ideal polishing time and the polishing rate as data, and collecting a plurality of these data to obtain the polishing rate The ideal polishing time is derived from this relationship by simply measuring the polishing rate on the monitor wafer, and the ideal polishing time in the current equipment state is derived, and the product wafer is polished with this ideal polishing time. To control to.

本発明に係る半導体装置は、前記のＣＭＰ装置を用いて研磨した工程を経て製造されたものである。
本発明に係る半導体装置の製造方法は、前記のＣＭＰ装置を用いて研磨する工程を有するものである。 The semiconductor device according to the present invention is manufactured through a polishing process using the CMP apparatus.
A method for manufacturing a semiconductor device according to the present invention includes a step of polishing using the CMP apparatus.

以下、図面を参照して本発明の実施の形態について説明する。
図１（ａ）は、本発明に係る実施の形態によるＣＭＰ（Chemical Mechanical Polishing）装置の概略を示す平面図であり、図１（ｂ）は、図１（ａ）に示すＣＭＰ装置の側面図である。
図１（ａ）、（ｂ）に示すように、ＣＭＰ装置は円盤形状のターンテーブル１１１を有しており、このターンテーブル１１１の下面には回転軸（図示せず）を介して回転モータ（図示せず）が配置されている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1A is a plan view showing an outline of a CMP (Chemical Mechanical Polishing) apparatus according to an embodiment of the present invention, and FIG. 1B is a side view of the CMP apparatus shown in FIG. It is.
As shown in FIGS. 1A and 1B, the CMP apparatus has a disk-shaped turntable 111, and a rotary motor (not shown) is provided on the lower surface of the turntable 111 via a rotary shaft (not shown). (Not shown) is arranged.

ターンテーブル１１１の上面上には研磨クロス１１３が貼り付けられている。ターンテーブル１１１の上方にはウエハ保持手段である研磨ヘッド１１７が配置されており、この研磨ヘッド１１７の上部には回転軸１１８を介して回転モータ（図示せず）が配置されている。また、ターンテーブル１１１の上方にはスラリー１２１を吐出するノズル１１９が配置されている。また、本ＣＭＰ装置は、研磨時間、ターンテーブル１１１の回転数、研磨ヘッド１１７の回転を制御する制御部（図示せず）を有している。   A polishing cloth 113 is affixed on the top surface of the turntable 111. A polishing head 117 serving as a wafer holding unit is disposed above the turntable 111, and a rotation motor (not shown) is disposed above the polishing head 117 via a rotation shaft 118. A nozzle 119 for discharging the slurry 121 is disposed above the turntable 111. The CMP apparatus also has a control unit (not shown) that controls the polishing time, the number of rotations of the turntable 111, and the rotation of the polishing head 117.

上記ＣＭＰ装置を図２に示すように動作させて次のように研磨する。
図２は、本発明に係る実施の形態によるＣＭＰ研磨方法を説明する図である。
１ロットには２５枚の製品用ウエハが含まれており、製品用ウエハの研磨はロット単位で行う。 The CMP apparatus is operated as shown in FIG. 2 to polish as follows.
FIG. 2 is a diagram for explaining a CMP polishing method according to an embodiment of the present invention.
One lot includes 25 product wafers, and the product wafers are polished on a lot basis.

まず、研磨レートを測定するために、モニター用ウエハを準備する。このモニター用ウエハには、製品用ウエハで研磨しようとしている膜（例えばシリコン酸化膜）が全面に成膜されている。次いで、モニター用ウエハの研磨前の膜厚（初期膜厚）を測定し、所定時間研磨を行う。即ち、研磨ヘッド１１７の下部にモニター用ウエハの裏面を真空保持し、ターンテーブル１１１を所定の回転数で矢印の方向に回転させ、ノズル１１９からスラリー１２１を吐出し、そのスラリーを研磨クロス１１３の中央付近に滴下し、回転モータによって研磨ヘッド１１７を所定の回転数で矢印の方向に回転させ、モニター用ウエハの表面（研磨面）を研磨クロス１１３に押圧し、さらに研磨ヘッド１１７によってウエハの裏面にエアー圧をかけて押圧する。このようにしてモニター用ウエハを所定時間研磨する。そして、研磨後の膜厚を測定し、初期膜厚と研磨後の膜厚と研磨時間から研磨レート（例えば３００ｎｍ／分）を導出する（ＳＴ１）。   First, in order to measure the polishing rate, a monitor wafer is prepared. A film (for example, a silicon oxide film) to be polished by the product wafer is formed on the entire surface of the monitor wafer. Next, the film thickness (initial film thickness) of the monitor wafer before polishing is measured and polished for a predetermined time. That is, the back surface of the monitor wafer is held under vacuum in the lower part of the polishing head 117, the turntable 111 is rotated in the direction of the arrow at a predetermined rotation number, the slurry 121 is discharged from the nozzle 119, and the slurry is removed from the polishing cloth 113. The liquid is dropped near the center, and the polishing head 117 is rotated in the direction of the arrow at a predetermined rotation number by a rotary motor, the surface (polishing surface) of the monitoring wafer is pressed against the polishing cloth 113, and the back surface of the wafer is further polished by the polishing head 117 Press the air pressure on. In this way, the monitor wafer is polished for a predetermined time. Then, the film thickness after polishing is measured, and a polishing rate (for example, 300 nm / min) is derived from the initial film thickness, the film thickness after polishing, and the polishing time (ST1).

次に、２５枚の製品用ウエハ（１ロット）を準備する。製品用ウエハにはシリコン酸化膜が成膜されており、このシリコン酸化膜が前記ＣＭＰ装置を用いて研磨される。
次いで、上記製品用ウエハの２５枚のうち１枚を抜き取り、シリコン酸化膜の初期膜厚を測定し、この初期膜厚と研磨後の狙い膜厚と研磨レートから研磨時間（例えば１００秒）を導出する。尚、ここでは１枚を抜き取っているが、２枚以上を抜き取ることも可能である。
次いで、上記の抜き取った１枚の製品用ウエハに対して前記導出した研磨時間の研磨処理を行う（ＳＴ２）。 Next, 25 product wafers (one lot) are prepared. A silicon oxide film is formed on the product wafer, and this silicon oxide film is polished using the CMP apparatus.
Next, one of the 25 product wafers is extracted, the initial film thickness of the silicon oxide film is measured, and the polishing time (for example, 100 seconds) is calculated from the initial film thickness, the target film thickness after polishing, and the polishing rate. To derive. Although one sheet is extracted here, it is possible to extract two or more sheets.
Next, a polishing process for the derived polishing time is performed on the one product wafer extracted (ST2).

この後、上記研磨処理後のシリコン酸化膜の膜厚を測定し、この膜厚と狙い膜厚から研磨時間の過不足を導出する（ＳＴ３）。すなわち、上記研磨処理後のシリコン酸化膜の膜厚を測定したら１３７０ｎｍであり、研磨後の狙い膜厚が１３００ｎｍである場合、７０ｎｍだけ研磨不足となるので、３００ｎｍ／分の研磨レートから計算すると研磨不足時間が１４秒間となる。尚、ＳＴ２の工程で２枚の製品用ウエハを抜き取り、研磨処理を行った場合、研磨時間の過不足を導出する際には平均値を用いることが好ましい。   Thereafter, the film thickness of the silicon oxide film after the polishing process is measured, and the excess or deficiency of the polishing time is derived from the film thickness and the target film thickness (ST3). That is, when the thickness of the silicon oxide film after the above polishing treatment is measured, it is 1370 nm, and when the target film thickness after polishing is 1300 nm, the polishing is insufficient by 70 nm. The shortage time is 14 seconds. In addition, when two product wafers are extracted and subjected to a polishing process in the step ST2, it is preferable to use an average value when deriving the excess or deficiency of the polishing time.

次に、上記ＳＴ３の工程で導出した研磨不足時間の研磨を行い、研磨後の膜厚を測定して狙い膜厚になっているかを確認し、前記研磨時間と研磨不足時間との和から理想研磨時間（例えば１００＋１４＝１１４秒）を導出する（ＳＴ４）。
次いで、上記製品用ウエハの２５枚のうち残りの２４枚に対して上記理想研磨時間（例えば１１４秒）の研磨処理を行う（ＳＴ５）。 Next, polishing is performed for the under-polishing time derived in the step ST3, and the post-polishing film thickness is measured to confirm whether the target film thickness is obtained. From the sum of the polishing time and the under-polishing time, an ideal is obtained. A polishing time (for example, 100 + 14 = 114 seconds) is derived (ST4).
Next, the remaining 24 of the 25 product wafers are polished for the ideal polishing time (eg, 114 seconds) (ST5).

この後、上記ＳＴ５の工程で研磨処理を行った２４枚のうち２枚を抜き取り、研磨後の膜厚を測定し、狙い膜厚となっていることを確認する（ＳＴ６）。尚、本実施の形態では、１ロットに対する研磨処理をＳＴ１〜ＳＴ６までの工程によって行っているが、２ロット以上に対する研磨処理をＳＴ１〜ＳＴ６までの工程によって行うことも可能である。また、ＳＴ１〜ＳＴ６の工程は制御部によって制御しながら行われることが好ましい。   Thereafter, two of the 24 sheets subjected to the polishing process in the step ST5 are extracted, the film thickness after polishing is measured, and it is confirmed that the target film thickness is obtained (ST6). In this embodiment, the polishing process for one lot is performed by the processes from ST1 to ST6, but the polishing process for two or more lots can also be performed by the processes from ST1 to ST6. Moreover, it is preferable to perform the process of ST1-ST6, controlling by a control part.

次いで、前記研磨レート（３００ｎｍ／分）と前記理想研磨時間（１１４秒）を制御部の記憶部にデータとして保存する。
次に、上述したＳＴ１〜ＳＴ６までの工程を、前記ＣＭＰ装置を用いて繰り返し行う。これにより、研磨レートが例えば２５０ｎｍ／分、理想研磨時間が１２０秒というデータ、研磨レートが例えば２３０ｎｍ／分、理想研磨時間が１４０秒というデータなどをとることができる。 Next, the polishing rate (300 nm / min) and the ideal polishing time (114 seconds) are stored as data in the storage unit of the control unit.
Next, the above-described steps ST1 to ST6 are repeated using the CMP apparatus. Thereby, data such as a polishing rate of 250 nm / min and an ideal polishing time of 120 seconds, data of a polishing rate of 230 nm / min and an ideal polishing time of 140 seconds, and the like can be obtained.

ＣＭＰ装置を使用していく間に研磨レートが変化していくのは、ＣＭＰ装置の状態（即ちマシンコンディション）が変化していくからである。この変化の原因となるものは、例えばＣＭＰ装置の研磨クロス１１３の摩耗、研磨剤の劣化などが挙げられる。前記のデータを前記記憶部に蓄積していくことにより、図３に示すような研磨レート（マシンコンディション）と理想研磨時間の関係を得ることができる。この関係は数式化（例えばｙ＝ａｘ＋ｂ、ｘが研磨レートでｙが理想研磨時間）することも可能である。   The reason why the polishing rate changes while using the CMP apparatus is that the state of the CMP apparatus (that is, the machine condition) changes. The causes of this change include, for example, wear of the polishing cloth 113 of the CMP apparatus, deterioration of the abrasive, and the like. By accumulating the data in the storage unit, a relationship between the polishing rate (machine condition) and the ideal polishing time as shown in FIG. 3 can be obtained. This relationship can be expressed by a mathematical formula (for example, y = ax + b, where x is a polishing rate and y is an ideal polishing time).

上記のような関係を得ることにより、研磨レートを測定するだけで理想研磨時間を導出することが可能となる。つまり、研磨レートを測定し、その研磨レートと前記の関係から理想研磨時間を導出することが可能となる。その場合は、前述したＳＴ２〜ＳＴ４の工程を省略することができ、研磨レートを測定した後、すぐにＳＴ５の工程で１ロットの２５枚のすべての製品用ウエハを理想研磨時間で研磨処理することができる。   By obtaining the relationship as described above, it is possible to derive the ideal polishing time only by measuring the polishing rate. That is, it is possible to measure the polishing rate and derive the ideal polishing time from the above-mentioned relationship with the polishing rate. In that case, the above-described steps ST2 to ST4 can be omitted, and immediately after measuring the polishing rate, all the 25 product wafers in one lot are polished in an ideal polishing time in the step ST5. be able to.

上記実施の形態によれば、ＳＴ１〜ＳＴ４の工程で理想研磨時間を導出することにより、従来のＣＭＰ研磨方法のように２回に分けて研磨処理を行う必要が無くなる上、終点検出機能を用いることなく研磨終点を正確に制御することができ、１回の研磨処理によって正確な狙い膜厚に研磨することができる。従って、ＣＭＰ装置の処理能力を向上させることができる。   According to the above embodiment, by deriving the ideal polishing time in the steps ST1 to ST4, it is not necessary to perform the polishing process in two steps as in the conventional CMP polishing method, and the end point detection function is used. Therefore, the polishing end point can be accurately controlled, and the film can be polished to an accurate target film thickness by a single polishing process. Therefore, the processing capability of the CMP apparatus can be improved.

また、研磨レートと理想研磨時間のデータを制御部の記憶部に蓄積していくといったデータのフィードバックを行い、研磨レート（マシンコンディション）と理想研磨時間の関係を得ることにより、ＳＴ２〜ＳＴ４の工程を省略しても１回の研磨処理によって正確な狙い膜厚に研磨することが可能となる。
尚、本発明は上述した実施の形態に限定されず、本発明の主旨を逸脱しない範囲内で種々変更して実施することが可能である。 In addition, the process of ST2 to ST4 is performed by feeding back data such as storing the data of the polishing rate and the ideal polishing time in the storage unit of the control unit and obtaining the relationship between the polishing rate (machine condition) and the ideal polishing time. Even if is omitted, it is possible to polish to an accurate target film thickness by a single polishing process.
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

また、上記実施の形態では、本発明をＣＭＰ装置、ＣＭＰ研磨方法に適用した例を示しているが、これに限定されるものではなく、本発明を半導体装置及びその製造方法に適用することも可能である。例えば、本実施の形態によるＣＭＰ装置を用いて研磨した工程を経て製造された半導体装置、本実施の形態によるＣＭＰ研磨方法を用いて研磨した工程を経て製造された半導体装置、本実施の形態によるＣＭＰ装置を用いて研磨する工程を有する半導体装置の製造方法、本実施の形態によるＣＭＰ研磨方法を用いて研磨する工程を有する半導体装置の製造方法についても本発明の適用範囲に含まれる。   In the above-described embodiment, the present invention is applied to a CMP apparatus and a CMP polishing method. However, the present invention is not limited to this, and the present invention may be applied to a semiconductor device and a manufacturing method thereof. Is possible. For example, a semiconductor device manufactured through a polishing process using the CMP apparatus according to the present embodiment, a semiconductor device manufactured through a polishing process using the CMP polishing method according to the present embodiment, and the present embodiment. A manufacturing method of a semiconductor device having a step of polishing using a CMP apparatus and a manufacturing method of a semiconductor device having a step of polishing using a CMP polishing method according to this embodiment are also included in the scope of the present invention.

本発明に係る実施の形態によるＣＭＰ装置の概略を示す図。The figure which shows the outline of the CMP apparatus by embodiment which concerns on this invention. 本発明に係る実施の形態によるＣＭＰ研磨方法を説明する図。The figure explaining the CMP grinding | polishing method by embodiment which concerns on this invention. 研磨レートと理想研磨時間の関係を示す図。The figure which shows the relationship between a polishing rate and ideal polishing time.

符号の説明Explanation of symbols

１１１…ターンテーブル、１１３…研磨クロス、１１５…ウエハ、１１７…研磨ヘッド、１１８…回転軸、１１９…ノズル、１２１…スラリー   DESCRIPTION OF SYMBOLS 111 ... Turntable, 113 ... Polishing cloth, 115 ... Wafer, 117 ... Polishing head, 118 ... Rotating shaft, 119 ... Nozzle, 121 ... Slurry

Claims (8)

モニター用ウエハで研磨レートを測定する第１工程と、
複数の製品用ウエハから一部を抜き取り、抜き取った一部の製品用ウエハの初期膜厚を測定し、前記初期膜厚と研磨後の狙い膜厚と前記研磨レートから研磨時間を導出する第２工程と、
前記一部の製品用ウエハに対して前記研磨時間の研磨処理を行う第３工程と、
前記第３工程での研磨処理後の膜厚を測定し、前記膜厚と狙い膜厚から研磨不足時間を導出する第４工程と、
前記研磨不足時間と前記第２工程で導出した研磨時間とから理想研磨時間を導出する第５工程と、
前記第２工程で一部が抜き取られた製品用ウエハの残りを前記理想研磨時間で研磨処理する第６工程と、
を具備するＣＭＰ研磨方法。 A first step of measuring a polishing rate with a monitor wafer;
Secondly, a part is extracted from a plurality of product wafers, an initial film thickness of a part of the extracted product wafers is measured, and a polishing time is derived from the initial film thickness, a target film thickness after polishing, and the polishing rate. Process,
A third step of performing a polishing process for the polishing time on the partial product wafer;
Measuring the film thickness after the polishing process in the third step, and deriving the polishing shortage time from the film thickness and the target film thickness;
A fifth step of deriving an ideal polishing time from the polishing shortage time and the polishing time derived in the second step;
A sixth step of polishing the remainder of the product wafer partially extracted in the second step with the ideal polishing time;
A CMP polishing method comprising: 前記第６工程の後又は前記第１工程乃至第６工程の途中で、前記第１工程で測定した研磨レートと前記第５工程で導出した理想研磨時間をデータとして保存し、前記第１工程乃至第６工程を繰り返し行うことにより研磨レートと理想研磨時間のデータを複数保存し、これら複数のデータから研磨レートと理想研磨時間の関係を導く第７工程をさらに具備する請求項１に記載のＣＭＰ研磨方法。   After the sixth step or in the middle of the first to sixth steps, the polishing rate measured in the first step and the ideal polishing time derived in the fifth step are stored as data, and the first to thorough steps are stored. 2. The CMP according to claim 1, further comprising a seventh step of storing a plurality of polishing rate and ideal polishing time data by repeating the sixth step and deriving a relationship between the polishing rate and the ideal polishing time from the plurality of data. Polishing method. 前記第７工程の後に、モニター用ウエハで研磨レートを測定し、この測定した研磨レートと前記第７工程で導いた関係から、現在の装置状態での理想研磨時間を導出し、前記理想研磨時間で製品用ウエハの研磨処理を行う第８工程をさらに具備する請求項２に記載のＣＭＰ研磨方法。   After the seventh step, the polishing rate is measured on the monitor wafer, and the ideal polishing time in the current apparatus state is derived from the measured polishing rate and the relationship derived in the seventh step, and the ideal polishing time The CMP polishing method according to claim 2, further comprising an eighth step of polishing the wafer for product with the step. 請求項１〜３のうちいずれか１項に記載のＣＭＰ研磨方法を用いて研磨した工程を経て製造された半導体装置。   The semiconductor device manufactured through the process grind | polished using the CMP grinding | polishing method of any one of Claims 1-3. 請求項１〜１のうちいずれか１項に記載のＣＭＰ研磨方法を用いて研磨する工程を有する半導体装置の製造方法。   A method for manufacturing a semiconductor device, comprising a step of polishing using the CMP polishing method according to claim 1. ウエハをＣＭＰ研磨するＣＭＰ装置であって、
回転可能に構成されたターンテーブルと、
前記ターンテーブル上に配置された研磨クロスと、
前記研磨クロス上にスラリーを供給するスラリー供給機構と、
前記ウエハを保持しながら前記研磨クロスに該ウエハを押し当てる研磨ヘッドと、
前記研磨ヘッド及び前記ターンテーブルの動作を制御する制御部と、
を具備するＣＭＰ装置において、
前記制御部は、モニター用ウエハで研磨レートを測定し、複数の製品用ウエハから一部を抜き取り、抜き取った一部の製品用ウエハの初期膜厚を測定し、前記初期膜厚と研磨後の狙い膜厚と前記研磨レートから研磨時間を導出し、前記一部の製品用ウエハに対して前記研磨時間の研磨処理を行い、研磨処理後の膜厚を測定し、前記膜厚と狙い膜厚から研磨不足時間を導出し、前記研磨不足時間と前記研磨時間とから理想研磨時間を導出し、前記理想研磨時間と前記研磨レートをデータとして保存し、これらのデータを複数収集することにより研磨レートと理想研磨時間の関係を導出し、この関係から、モニター用ウエハで研磨レートを測定するだけで現在の装置状態での理想研磨時間を導出し、この理想研磨時間で製品用ウエハを研磨するように制御するＣＭＰ装置。 A CMP apparatus for CMP polishing a wafer,
A turntable configured to be rotatable,
A polishing cloth disposed on the turntable;
A slurry supply mechanism for supplying slurry onto the polishing cloth;
A polishing head for pressing the wafer against the polishing cloth while holding the wafer;
A control unit for controlling operations of the polishing head and the turntable;
In a CMP apparatus comprising:
The control unit measures a polishing rate with a monitor wafer, extracts a part from a plurality of product wafers, measures an initial film thickness of the extracted product wafers, The polishing time is derived from the target film thickness and the polishing rate, the polishing process is performed on the part of the product wafers, the film thickness after the polishing process is measured, and the film thickness and the target film thickness are measured. Deriving the polishing undertime from the above, deriving the ideal polishing time from the underpolishing time and the polishing time, storing the ideal polishing time and the polishing rate as data, and collecting a plurality of these data to obtain the polishing rate The ideal polishing time is derived from this relationship by simply measuring the polishing rate on the monitor wafer, and the ideal polishing time in the current equipment state is derived, and the product wafer is polished with this ideal polishing time. CMP apparatus for controlling to. 請求項６に記載のＣＭＰ装置を用いて研磨した工程を経て製造されたことを特徴とする半導体装置。   A semiconductor device manufactured through a polishing process using the CMP apparatus according to claim 6. 請求項６に記載のＣＭＰ装置を用いて研磨する工程を有することを特徴とする半導体装置の製造方法。   A method for manufacturing a semiconductor device, comprising a step of polishing using the CMP apparatus according to claim 6.
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