JP5712058B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP5712058B2 JP5712058B2 JP2011124801A JP2011124801A JP5712058B2 JP 5712058 B2 JP5712058 B2 JP 5712058B2 JP 2011124801 A JP2011124801 A JP 2011124801A JP 2011124801 A JP2011124801 A JP 2011124801A JP 5712058 B2 JP5712058 B2 JP 5712058B2
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- wafer
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- semiconductor device
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- semiconductor wafer
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- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
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Description
先ず、本願において開示される発明の代表的な実施の形態について概要を説明する。
(a)表面側のデバイス形成処理が完了した半導体ウエハの裏面に対して、研削処理を実行することにより、前記半導体ウエハを薄膜化する工程;
(b)前記工程(a)の後、サセプタ上に、前記半導体ウエハをその表面が下を向いて、その自重によって保持した状態で、前記半導体ウエハに対して予熱処理を実行することにより、室温よりも高い温度に昇温する工程;
(c)前記工程(b)の後、前記昇温状態を維持し、前記サセプタ上に、前記半導体ウエハをその表面が下を向いて、その自重によって保持した状態で、前記半導体ウエハの裏面に対して、スパッタリング成膜により、第1のメタル膜を成膜する工程、
ここで、前記サセプタは円環状の形状を呈し、その円環の放射状垂直断面は、以下の各上側表面を有する:
(x1)前記半導体ウエハの前記表面の周辺部を重力に対して保持する第1の上側表面;
(x2)前記第1の上側表面に続いて、その外側にあって、前記第1の上側表面よりも垂直に近い傾きを有し、前記半導体ウエハの側面を横ずれに対して保持する第2の上側表面、
ここで更に、前記第2の上側表面と垂直面のなす第1の角度は、0度以上、且つ、20度以下である。
(d)前記工程(c)の後、前記サセプタ上に、前記半導体ウエハをその表面が下を向いて、その自重によって保持した状態で、熱処理を施すことによって、前記第1のメタル膜をシリサイド化する工程。
(e)前記工程(d)の後、前記半導体ウエハを前記サセプタ内に収容した状態において、前記半導体ウエハの前記表面を吸着ステージに吸着させる工程;
(f)前記工程(e)の後、前記半導体ウエハを前記サセプタ内に収容し、前記半導体ウエハの前記表面を吸着ステージに吸着させた状態で、前記半導体ウエハの前記裏面に対して、スパッタリング成膜により、第2のメタル膜を成膜する工程。
(x3)前記第2の上側表面に続いて、その外側にあって、前記第2の上側表面よりも水平に近い傾きを有する第3の上側表面。
1.本願において、実施の態様の記載は、必要に応じて、便宜上複数のセクションに分けて記載する場合もあるが、特にそうでない旨明示した場合を除き、これらは相互に独立別個のものではなく、単一の例の各部分、一方が他方の一部詳細または一部または全部の変形例等である。また、原則として、同様の部分は繰り返しを省略する。また、実施の態様における各構成要素は、特にそうでない旨明示した場合、理論的にその数に限定される場合および文脈から明らかにそうでない場合を除き、必須のものではない。
実施の形態について更に詳述する。各図中において、同一または同様の部分は同一または類似の記号または参照番号で示し、説明は原則として繰り返さない。
ここでは、パワー系半導体装置の一例としてパワーMOSFET(用途の一例を挙げるとすれば、たとえば、PC電源用DC−DCコンバータのハイサイドスイッチ)を例に取り具体的に説明するが、本願の発明はそれに限定されることなく、たとえば、IGBT等にも適用できることは言うまでもない。
このセクションでは、0.15マイクロメートルプロセスのリニアトレンチゲート型パワーMOSFETの例について、図15から図24に基づいて、セクション1における図14の帯状繰り返しデバイスパターン領域切り出し部分(リニアセル領域)Rに対応するデバイス断面等について、プロセスフローを説明する。
このセクションでは、前セクションの図24で説明したウエハ裏面多層メタル成膜プロセスに使用するウエハ処理装置(多層スパッタリング成膜装置)について更に説明する。なお、200φウエハ用の市販の好適な装置としては、株式会社アルバック(ULVAC,Inc.)の多層スパッタリング成膜装置SRH−420等を例示することができる。
このセクションでは、セクション3で説明した多層スパッタリング成膜装置51を使用したウエハ裏面多層メタル層成膜プロセスについて、パワーMOS系デバイス(裏面電極構造は図24に示す)を例にとり説明する。
このセクションでは、セクション4のプロセスを実行するに当たり、ウエハ1のベンドによる各種トラブルを回避するためのセクション3で説明した成膜等装置、特に図4および図5のウエハサセプタ65(サセプタ)の断面形状の工夫について説明する。
薄膜ウエハの処理は、ハンドリングの容易さから、ウエハの被処理対象面と逆の面に硝子板やシリコンウエハ等の補強板を貼り付けた状態で実行されることがある。しかし、このような補強板方式は、比較的高価なプロセスとして知られている。そこで、前記実施の形態では、このような補強板を使用せず、比較的ベンド量が大きい場合であっても、薄膜ウエハをリング状のサセプタ上に自由載置状態で保持して、加熱および成膜処理が可能な方法を検討したものである。
以上本発明者によってなされた発明を実施形態に基づいて具体的に説明したが、本願の発明はそれに限定されるものではなく、その要旨を逸脱しない範囲において種々変更可能であることは言うまでもない。
また、前記実施の形態では、主にシリコン系基板を用いたパワー系MOSFETおよびIGBTを具体的に説明したが、本発明はそれに限定されるものではなく、SiC系基板、GaN基板、GaAs基板、InP基板等を用いたものにも適用できることは言うまでもない。
1a ウエハのデバイス面(第1の主面)
1b ウエハの裏面
1e エピタキシャル層(n型エピタキシャル層)
1s n+シリコン基板部
2 n型ドリフト領域
3 p型チャネル領域(p型ベース領域)
4 n+ソース領域
5 p+ボディコンタクト領域
6 トレンチゲート電極(ポリシリコン電極)
7 ゲート絶縁膜
8 チップ又はチップ領域
9 レジスト膜
10 デバイス形成領域
11 ソースパッド
13 ゲートパッド
14 スクライブ領域(ダイシング領域)
15 裏面メタル電極膜
15a 裏面チタン膜
15b 裏面ニッケル膜(第2のメタル膜)
15c 裏面金膜
15s ニッケルシリサイド膜
16 周辺デバイス非形成領域
17 デバイス形成領域と周辺デバイス非形成領域の境界
19 ガードリング
20 ノッチ
21 層間絶縁膜
22 凹部(ソースコンタクト溝)
23 バリアメタル膜
24 アルミニウム系メタル膜(ソース電極)
41 ウエハ保持部またはウエハ載置部(第1の上側表面)
41i ウエハ保持部最内周
41p ウエハ保持部最外周
42 側方内面(第2の上側表面)
43 上方内面(第3の上側表面)
44 下方内側面
50 リフトステージ
51 ウエハ処理装置(多層スパッタリング成膜装置)
52 ロードポート部
53 成膜処理部
54 ウエハカセット(ウエハ搬送容器)
55 ステージ支持台
56 外部ロボット
56a 外部ロボット先端部
57 スパッタリング成膜処理室
58 内部搬送ロボット
59 ターゲット切替機構(上部電極又はカソード)
60 Oリング
61 ロードロック室(脱ガス室)
62a 単一ターゲット成膜処理領域
62b マルチターゲット成膜処理領域
62c 単一ターゲット成膜処理領域
63a ランプ加熱ウエハステージ
63b 冷却ウエハステージ
63c 冷却ウエハステージ
63d 真空フランジ付きウエハステージ
64a 金ターゲット(非磁性ターゲット)
64n ニッケルターゲット(磁性ターゲット)
64s シリサイド膜形成用ニッケルターゲット(磁性ターゲット)
64t チタンターゲット(非磁性ターゲット)
64x ターゲット切替機構の空きポジション
65 ウエハサセプタ
65n (ウエハサセプタの)位置ずれ防止ノッチ
65t (ウエハサセプタの)上端部(上端水平面)
66 水冷ホルダ部(冷却用ベース金属板)
67 金属スペーサ
68 ESCセラミック板(内部に電極あり)
69a,69b サセプタ位置決め用絶縁リング
70 ウエハ表面保護層(ポリイミドフィルム)
71 ウエハホルダベース
72 ランプヒータ
73 反射板
74 マグネトロン用マグネット群(マグネット搭載回転板)
75 膜付着防止シールド
75i 膜付着防止シールドの内端
76 ガス供給ライン(ガス供給ノズル)
77 ウエハゲート
78 ドライ粗引きポンプ
79 クライオポンプ
80 ウエハ裏面加熱機構
81 ターボ分子ポンプ
82 分子ポンプバルブ
83 ドライポンプバルブ
84 粗引きバルブ
85 クライオポンプ排気バルブ
86 メイン排気バルブ
87 ロードロック排気バルブ
88 排気管(真空排気系)
89 成膜処理室の外壁
90 ターゲット切替機構収納用拡張区画
91 成膜処理室の内壁
92 マグネット-ターゲット間隔壁
93 マグネットの回転中心
94n 磁石のN極
94s 磁石のS極
95 バッキングメタルプレート
96 スペーサ板
97 付着防止リング
98 石英窓
99 金属ステージ
100 多層メッキ単位サイクル
101 サセプタへ搭載工程
102 ロードロック室への導入工程
103 脱ガス処理工程(真空処理)
105 Ti/Ni成膜領域でのTi成膜工程
106 Ti/Ni成膜領域でのNi成膜工程(第2のメタル膜成膜工程)
107 金成膜工程
108 ロードロック室からの排出工程
109 サセプタからの取り出し工程
111 Ni成膜領域でのNi成膜工程(第1のメタル膜の成膜工程)
112 アロイ処理工程(シリサイド化工程)
B ウエハ反り量
C 加熱用ステージ端部切り出し部
CB 湾曲したウエハ端部とサセプタ内面のクリアランス
CF 平坦なウエハ端部とサセプタ内面のクリアランス
D マグネットターゲット間距離
L 単一ターゲット成膜処理領域周辺部
G セル繰り返し単位領域
P サセプタ周辺切り出し部
R 帯状繰り返しデバイスパターン領域切り出し部分
S 側方内面と上方内面に面取りがある場合の輪郭
T 上方内面がない場合の輪郭
Θ1 側方内面(第2の上側表面)と垂直面のなす角(テーパ角度、第1の角度)
Θ2 上方内面(第3の上側表面)と水平面のなす角(上方切り取り角度)
Θ3 ベンドしたウエハと側方内面(第2の上側表面)の接触角
Claims (12)
- 以下の工程を全て含む半導体装置の製造方法:
(a)表面側のデバイス形成処理が完了した半導体ウエハの裏面に対して、研削処理を実行することにより、前記半導体ウエハを薄膜化する工程;
(b)前記工程(a)の後、サセプタ上に、前記半導体ウエハをその表面が下を向いて、その自重によって保持した状態で、前記半導体ウエハに対して予熱処理を実行することにより、室温よりも高い温度に昇温する工程;
(c)前記工程(b)の後、前記昇温状態を維持し、前記サセプタ上に、前記半導体ウエハをその表面が下を向いて、その自重によって保持した状態で、前記半導体ウエハの裏面に対して、スパッタリング成膜により、第1のメタル膜を成膜する工程、
ここで、前記サセプタは円環状の形状を呈し、その円環の放射状垂直断面は、以下の各上側表面を有する:
(x1)前記半導体ウエハの前記表面の周辺部を重力に対して保持する第1の上側表面;
(x2)前記第1の上側表面に続いて、その外側にあって、前記第1の上側表面よりも垂直に近い傾きを有し、前記半導体ウエハの側面を横ずれに対して保持する第2の上側表面、
ここで更に、前記第2の上側表面と垂直面のなす第1の角度は、0度以上、且つ、20度以下である。 - 請求項1に記載の半導体装置の製造方法において、前記第1の角度は、5度以上、且つ、15度以下である。
- 請求項2に記載の半導体装置の製造方法において、前記サセプタは、石英製である。
- 請求項3に記載の半導体装置の製造方法において、前記半導体装置は、パワー系半導体装置である。
- 請求項4に記載の半導体装置の製造方法において、前記半導体ウエハは、シリコン系ウエハである。
- 請求項5に記載の半導体装置の製造方法において、更に以下の工程を含む:
(d)前記工程(c)の後、前記サセプタ上に、前記半導体ウエハをその表面が下を向いて、その自重によって保持した状態で、熱処理を施すことによって、前記第1のメタル膜をシリサイド化する工程。 - 請求項6に記載の半導体装置の製造方法において、更に以下の工程を含む:
(e)前記工程(d)の後、前記半導体ウエハを前記サセプタ内に収容した状態において、前記半導体ウエハの前記表面を吸着ステージに吸着させる工程;
(f)前記工程(e)の後、前記半導体ウエハを前記サセプタ内に収容し、前記半導体ウエハの前記表面を吸着ステージに吸着させた状態で、前記半導体ウエハの前記裏面に対して、スパッタリング成膜により、第2のメタル膜を成膜する工程。 - 請求項7に記載の半導体装置の製造方法において、前記工程(a)の後の前記半導体ウエハの厚さは、280マイクロメートル以下である。
- 請求項8に記載の半導体装置の製造方法において、前記工程(b)から(f)においては、前記半導体ウエハは、補強板に貼り付けられていない。
- 請求項9に記載の半導体装置の製造方法において、前記サセプタの円環の放射状垂直断面は、以下の上側表面を有する:
(x3)前記第2の上側表面に続いて、その外側にあって、前記第2の上側表面よりも水平に近い傾きを有する第3の上側表面。 - 請求項1に記載の半導体装置の製造方法において、前記工程(b)から(c)においては、前記半導体ウエハは、補強板に貼り付けられていない。
- 請求項1に記載の半導体装置の製造方法において、前記予熱処理により昇温された温度は、摂氏250度以上である。
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JPH09260296A (ja) * | 1996-03-21 | 1997-10-03 | Sumitomo Sitix Corp | ウェーハ支持装置 |
JPH10242251A (ja) * | 1997-02-26 | 1998-09-11 | Shibaura Eng Works Co Ltd | 基板ホルダー |
JP2004128037A (ja) * | 2002-09-30 | 2004-04-22 | Trecenti Technologies Inc | 半導体装置の製造方法 |
JP4826070B2 (ja) * | 2004-06-21 | 2011-11-30 | 信越半導体株式会社 | 半導体ウエーハの熱処理方法 |
WO2006071363A2 (en) * | 2004-11-08 | 2006-07-06 | Brewer Science Inc. | Device for coating the outer edge of a substrate during microelectronics manufacturing |
JP2006307291A (ja) * | 2005-04-28 | 2006-11-09 | Seiko Epson Corp | スパッタ装置 |
JP2007266347A (ja) * | 2006-03-29 | 2007-10-11 | Renesas Technology Corp | 半導体装置の製造方法 |
JP2008288451A (ja) * | 2007-05-18 | 2008-11-27 | Renesas Technology Corp | 半導体装置の製造方法 |
JP2010021171A (ja) * | 2008-07-08 | 2010-01-28 | Renesas Technology Corp | 半導体装置の製造方法およびそれに用いる半導体製造装置 |
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