JP2016192450A - 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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- JP2016192450A JP2016192450A JP2015070422A JP2015070422A JP2016192450A JP 2016192450 A JP2016192450 A JP 2016192450A JP 2015070422 A JP2015070422 A JP 2015070422A JP 2015070422 A JP2015070422 A JP 2015070422A JP 2016192450 A JP2016192450 A JP 2016192450A
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- wafer
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- semiconductor wafer
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Abstract
Description
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等に分けて記載するが、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、記載の前後を問わず、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の説明を省略する。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。
本実施の形態では、半導体装置の一例として、例えば電力変換装置などに組み込まれ、スイッチング素子として用いられるトランジスタ素子を備える半導体チップ1(図1参照)および半導体チップ1が搭載された半導体装置PKG1、を取り上げて説明する。図1は本実施の形態の半導体チップの上面図、図2は、図1に示す半導体チップの下面図である。また、図3は、図1および図2に示す半導体チップが備える電界効果トランジスタの素子構造例を示す要部断面図である。
次に、本実施の形態の半導体装置の製造方法について説明する。図4〜図7に示す半導体装置PKG1は、図8に示すフローに沿って製造される。図8は、本実施の形態の半導体装置の製造工程の概要を示す説明図である。
まず、図8に示す半導体チップ準備工程について説明する。図8に示すように、半導体チップ準備工程は、ウエハ準備工程、裏面研削工程、裏面端子形成工程、周縁部分割工程、マーク形成工程、テープカット工程、ウエハ分割工程、およびチップ取得工程を有している。
ウエハ準備工程では、図9および図10に示すウエハ(半導体ウエハ)10を準備する。図9は、図8に示すウエハ準備工程で準備する半導体ウエハの主面側の平面を示す平面図である。また図10は、図9に示す半導体ウエハの断面図である。
次に、裏面研削工程では、図11および図12に示すように、ウエハ10の裏面10b(図11参照)を研削し、裏面10bよりも表面1t側に位置する裏面1b(図12、図13参照)を露出させる。図11は、図8に示す裏面研削工程のフローを模式的に示す説明図である。また、図12は、裏面研削工程後のウエハの裏面側の平面図である。また、図13は、図12に示すウエハの周縁部近傍の拡大断面図である。
次に、図8に示す裏面端子形成工程では、図14に示すように、ウエハ10の裏面1bおよび裏面12bに金属膜15を形成する。図14は、図13に示すウエハの裏面側に金属膜を形成した状態を示す拡大断面図である。
次に、図8に示す周縁部分離工程では、図15に示すように、ウエハ10の中央部11と周縁部12とを切り分ける。図15は、図14に示すウエハの中央部と周縁部とを切り離し、周縁部を取り除いた状態を模式的に示す斜視図である。また、図16は、図14に示すウエハを、保持テープを介して固定リングに固定した状態を示す斜視図である。また、図17は、図16に示すウエハの周縁部近傍の拡大断面図である。また、図18は、図17に示すウエハの中央部と周縁部の境界の近傍をリング状に切削加工して切断する工程を示す平面図である。また、図19は、図18に示すブレードでウエハの一部を切削加工している状態を示す拡大断面図である。また、図20は、図19に示す保持テープに紫外線を照射した状態を示す断面図である。また、図21は、図20に示す保持テープからウエハの周縁部を剥離させて除去する状態を示す断面図である。
次に、図8に示すマーク形成工程では、図22に示すように、保持テープ31に貫通孔を形成して、ウエハ10の向きを特定するための識別記号であるマーク31cを形成する。図22は、図21に示すウエハの中央部を保持する保持テープに、マークを形成した状態を示す平面図である。
次に、図8に示すテープカット工程では、図23に示すように、ウエハ10の中央部11の周囲の保持テープ31を切断して、中央部11と固定リング30とを分離する。図23は、図22に示すウエハの中央部を保持する保持テープを切断してウエハと固定リングとを分離する様子を模式的に示す平面図である。
本工程では、固定リング30とウエハ10とを分離できれば良いので、保持テープ31の切断位置には種々の変形例がある。図23に示す例では、図18に示すウエハ10の周縁部12の外周縁の位置をトレースするように、テープカッタTCを円形に移動させる。これにより、周縁部12を除去する前のウエハ10と同じ平面寸法の保持テープ31が得られる。この場合、図8に示すウエハ分割工程では、保持テープ31の周縁部をウエハの周縁部と見做して作業を行うことができる点で好ましい。
次に、ウエハ分割工程では、図24に矢印を付して模式的に示すように、ブレード42を用いて、ウエハ10をダイシング領域10dの延在方向に沿って切断し、チップ領域10c毎に分割する。図24は、図23に示すウエハをチップ領域毎に分割するウエハ分割工程の様子を模式的に示す平面図である。また、図25は、図23に示すウエハにウエハ分割工程用の保持フィルムを貼り付けた状態を示す断面図である。また、図25は、図25に示すウエハをブレードで切断する工程を示す断面図である。
次に、チップ取得工程では、図26に示す保持テープ41から分割済の各チップ領域10c(図24参照)を個別に取り出して、図1〜図3に示す半導体チップ1を複数個取得する。また、保持テープ41から各チップ領域10cを個別に取り出す工程は、ダイシングテープから個片化された半導体チップを取り出す一般的な技術を応用して適用することができる。例えば、保持テープ41の粘着層41a(図25参照)中に硬化前の紫外線硬化性樹脂成分を予め含ませておく。そして、上記ウエハ分割工程の後で、保持テープ41に紫外線を照射し、糊材を硬化させると、保持テープ41の接着強度が低下する。保持テープ41の接着強度が低下させれば、例えばコレット(図示は省略)と呼ばれる保持治具(ピックアップ治具)を用いて、個々のチップ領域10c(図1〜図3に示す半導体チップ1)を容易に取り出すことができる。ところで、本工程では、厚さが非常に薄い半導体チップ1をハンドリングする。しかし、上記したウエハ分割工程で、個片化された半導体チップ1は、表面1tおよび裏面1bの平面積が、一体化したウエハ10(例えば図24参照)よりも小さいため、ハンドリング時の変形や損傷は発生し難い。
次に、図4〜図7に示す半導体装置PKG1の組み立て工程を、図8に沿って簡単に説明する。なお、本セクションでは、図4〜図7を参照して説明する。
以上、本発明者によってなされた発明を実施の形態に基づき具体的に説明したが、本発明は上記実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能であることはいうまでもない。例えば、上記あるいは以下で説明する複数の変形例を互いに組み合わせても良い。
1b 裏面(面、下面)
1DT ドレイン端子(電極パッド)
1GT ゲート端子(電極パッド)
1ST ソース端子(電極パッド)
1t 表面(面、上面)
3 タブ(チップ搭載部)
3b 下面(実装面)
3t 上面(チップ搭載面)
4、4D、4G、4S リード
4t 上面
5 封止体(樹脂体)
5b 下面(実装面)
5t 上面
6 導電性接合材(導電性部材)
7 金属クリップ(導電性部材、金属板)
8 導電性接合材
9 ワイヤ(導電性部材)
10、10A ウエハ(半導体ウエハ)
10b 裏面(面、下面)
10c チップ領域
10d ダイシング領域
10n ノッチ
11 中央部
11w 幅
12 周縁部
12b 裏面
12w 幅
13 段差部
15 金属膜
20 バックグラインドテープ
21、22 砥石(研削治具)
30、40 固定リング(支持部材)
31 保持テープ(周縁部分離用保持テープ)
31a、41a 粘着層
31b、41b 下面
31c マーク
31f、41f 基材
31t、41t 上面(接着面)
33 ステージ
33A、33B 部分
34 隙間
35 隙間
36 ブレード(回転刃)
37 ステージ
37t 支持面
38 スピンドル
39 搬送治具
41 保持テープ(ダシングテープ、ウエハ分割用保持テープ)
42 ブレード(回転刃)
BC ボディコンタクト領域
BM バリア導体膜
CH チャネル形成領域
CL 配線
CTR1 溝
EP エピタキシャル層
GE ゲート電極
GI ゲート絶縁膜
IL 絶縁膜
PKG1 半導体装置
SD 金属膜(外装めっき膜)
SR ソース領域
TC テープカッタ
TL 吊りリード
TR1、TR2 トレンチ(開口部、溝)
UVR 紫外線
WH 半導体基板
Wt 主面
Claims (16)
- (a)第1面、および前記第1面の反対側の第2面を有する半導体ウエハの前記第1面側に回路を形成する工程と、
(b)第1部分、および前記第1部分の周囲を囲む第2部分を有する前記半導体ウエハの前記第2面を、前記第1部分の厚さが前記第2部分の厚さよりも薄くなるように研削する工程と、
(c)第1テープの接着面を前記半導体ウエハの前記第1面に貼り付ける工程と、
(d)前記半導体ウエハが前記第1テープに保持された状態で、前記第1部分の前記第2面側に当接された回転刃により前記第1部分の一部を切断し、前記第1部分と前記第2部分とに切り分ける工程と、
を有する半導体装置の製造方法。 - 請求項1において、
前記第1テープの厚さは、前記(b)工程の後の前記第1部分の厚さよりも厚い、半導体装置の製造方法。 - 請求項2において、
(e)前記(d)工程の後、前記第2部分を除去する工程と、
(f)前記第1テープが貼り付けられた状態で、前記半導体ウエハの前記第1部分の前記第2面側に第2テープの接着面を貼り付ける工程と、
(g)前記(f)工程の後、前記第1テープを前記半導体ウエハから剥がす工程と、
を更に有する、半導体装置の製造方法。 - 請求項3において、
前記第1テープは、第1基材と前記第1基材の一方の面に設けられ、前記半導体ウエハの前記第1面に貼り付けられる第1粘着層を有し、
前記第2テープは、第2基材と前記第2基材の一方の面に設けられ、前記半導体ウエハの前記第1部分の前記第2面に貼り付けられる第2粘着層を有し、
前記第1粘着層の厚さは、前記第2粘着層の厚さよりも厚い、半導体装置の製造方法。 - 請求項3において、
半導体ウエハの前記第1部分は、複数のチップ領域、および複数のチップ領域の間に設けられた複数のダイシング領域を有し、
前記(g)工程の後、前記半導体ウエハが前記第2テープに保持された状態で、前記第1部分の前記第1面側に当接された回転刃により前記ダイシング領域の延在方向に沿って前記第1部分を切断し、前記複数のチップ領域をそれぞれ分割する工程、を更に有する、半導体装置の製造方法。 - 請求項1において、
前記(c)工程は、
(c1)前記回転刃を回転させながら、前記半導体ウエハの前記第1部分の外縁に沿って円弧を描くように前記回転刃を移動させて前記第1部分の前記第2面側に切削加工を施し、溝を形成する工程と、
(c2)前記(c1)工程の後、前記溝に沿って切削加工を施し、前記第1部分を厚さ方向に切断する工程と、
を有する、半導体装置の製造方法。 - 請求項6において、
前記(c1)工程で形成される前記溝の深さは、前記(c2)工程で行う切削加工での切削溝深さよりも深い、半導体装置の製造方法。 - 請求項6において、
前記(c1)工程での切削加工幅と、前記(c2)工程での切削加工幅は同じである、半導体装置の製造方法。 - 請求項6において、
前記(c1)工程と、前記(c2)工程との間に、前記回転刃と前記半導体ウエハとが互いに接触した状態が維持される、半導体装置の製造方法。 - 請求項1において、
前記(c)工程では、前記半導体ウエハの前記第1部分の外縁に沿って切断する、半導体装置の製造方法。 - 請求項1において、
前記(c)工程では、前記半導体ウエハの前記第1部分の外縁に沿って円弧を描くように前記第1部分を切断する、半導体装置の製造方法。 - 請求項1において、
前記(b)工程の後の前記第1部分の厚さは100μm以下である、半導体装置の製造方法。 - 請求項1において、
前記(b)工程の後、かつ、前記(c)工程の前に前記第1部分の前記第2面を覆うように金属膜を形成する工程を更に有する、半導体装置の製造方法。 - 請求項1において、
前記(d)工程の後、前記第1テープの一部に、前記半導体ウエハの向きを識別するマークを形成する工程を更に有する、半導体装置の製造方法。 - (a)第1面、および前記第1面の反対側の第2面を有する半導体ウエハの前記第1面側に回路を形成する工程と、
(b)第1部分、および前記第1部分の周囲を囲む第2部分を有する前記半導体ウエハの前記第2面を、前記第1部分の厚さが前記第2部分の厚さよりも薄くなるように研削する工程と、
(c)固定リングに貼り付けられ、かつ、前記(b)工程の後の前記第1部分よりも厚い第1の厚さを有する第1テープの接着面を前記半導体ウエハの前記第1面に貼り付ける工程と、
(d)前記半導体ウエハが前記第1テープに保持された状態で、前記第1部分の前記第2面側に当接された回転刃により前記第1部分の一部を切断し、前記第1部分と前記第2部分とに切り分け、前記第2部分を除去する工程と、
(e)前記(d)工程の後、前記第1テープの一部に、前記半導体ウエハの向きを識別するマークを形成する工程と、
を有する半導体装置の製造方法。 - 請求項15において、
前記(e)工程の後、前記第1テープの周囲を切断して前記第1テープに保持された前記半導体ウエハと、前記固定リングとを分離する工程、を更に有する、半導体装置の製造方法。
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