JP4471213B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP4471213B2 JP4471213B2 JP2004378564A JP2004378564A JP4471213B2 JP 4471213 B2 JP4471213 B2 JP 4471213B2 JP 2004378564 A JP2004378564 A JP 2004378564A JP 2004378564 A JP2004378564 A JP 2004378564A JP 4471213 B2 JP4471213 B2 JP 4471213B2
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Description
また、半導体装置の裏面に捺印したピンマークを用いて半導体装置の突起電極と配線基板の配線端子との位置合せを行っているため、半導体ウェハを個片に分割するときの切断精度やピンマークの捺印精度のバラツキにより、突起電極の位置を正確に認識することが難しく、突起電極と配線端子との位置ずれが生ずる場合があるという問題がある。
図1、図2において、1は半導体装置であり、ウェハレベルチップサイズパッケージ型の半導体装置である。
2はシリコンからなる半導体基板であり、そのおもて面には図示しない半導体素子を配線で接続した複数の回路素子が形成されている(この回路素子が形成される半導体基板2のおもて面を回路形成面3という。)。
5は絶縁層4上に形成された電極パッドであり、シリコンを含有するアルミニウム等で形成され、コンタクトホールの内部に形成された導電層を介して対応する回路素子に電気的に接続されている。
7はポリイミド等で形成された層間絶縁膜であり、パッシベーション膜6上に形成され、半導体基板2に加えられる応力を緩和する機能を有している。
8は金属薄膜層であり、層間絶縁膜7および電極パッド5上に形成されている。
本実施例のポスト10は、図1、図2に示すように略8角形に形成された再配線9上に形成された略円形の断面形状を有する柱状部材である。
15はエポキシ樹脂等の封止樹脂で形成された封止層であり、ポスト10のポスト端面10aおよび識別突起12の突起端面12aを除く半導体基板2の回路形成面3側の全面を覆うように、つまり層間絶縁膜7、金属薄膜層8、再配線9、非導通再配線13およびポスト10と識別突起12の側面を覆うように形成されており、封止層15のおもて面とポスト端面10aおよび突起端面12aとは同一平面に位置している。これにより突起端面12aが封止層15のおもて面に露出して識別マーク14が封止層15のおもて面に形成される。
上記の識別マーク14は、半導体装置1の方向を認識するためのマークであり、本実施例では封止層15のおもて面の一つの角部15aに形成された三角形、つまり近接するポスト10が接続する再配線9の8角形の一の再配線側面9aと少なくとも一部が図1に示す所定の間隔Kを隔てて形成された近接辺14aである斜辺と、封止層15の角部15aを形成する2つの封止層側面15bにそれぞれ平行に形成された2つの側辺14bとで構成された形状であって、半導体装置1が図1に示すように四角形の場合には近接辺14aである斜辺と直交する2つの側辺14bとで形成される直角三角形となり、本実施例では近接辺14aを再配線側面9aと平行に形成しているので直角二等辺三角形である。
以下に、図3から図5を用いて実施例1の半導体装置の製造方法について説明する。
図3、図5は実施例1の半導体装置の製造工程を示す説明図であり、図3は突起電極16が形成されるまでの工程をPで示す工程に従って示し、図5は図4に示す半導体ウェハ20を個片に分割するまでの工程をPAで示す工程に従って示したものである。
P1、円柱状のシリコンをスライスして形成された円形の半導体基板2の回路形成面3に、図示しない複数の回路素子を形成し、各回路素子の上部に図示しないコンタクトホールを設けた絶縁層4を形成する。このコンタクトホール内部には図示しない導電層が形成されている。
電極パッド5の形成後に、電極パッド5と絶縁層4上にCVD(Chemical Vapor Deposition)法によってシリコン窒化膜からなるパッシベーション膜6を形成して電極パッド5の部位をエッチングにより除去し、パッシベーション膜6および電極パッド5上にポリイミドからなる層間絶縁膜7を形成して電極パッド5の部位をエッチングにより除去する。
P2、リソグラフィ等により金属薄膜層8上にレジスト21を形成して再配線9および非導通再配線13を形成する部位以外の領域をマスキングし、露出している金属薄膜層8上にメッキにより再配線9および非導通再配線13を形成する。
P6、封止層15の表層を研磨して研磨後のおもて面にポスト10のポスト端面10aおよび識別突起12の突起端面12aを露出させる。これにより封止層15のおもて面とポスト端面10aおよび突起端面12aとが同一平面に位置すると共に層間絶縁膜7、金属薄膜8、再配線9、非導通再配線13およびポスト10と識別突起12の側面が封止層15により封止される。
以上の工程により、図4に示す個片に分割される前の複数の半導体装置1が形成された半導体ウェハ20が形成され、これらの半導体装置1は縦横に設けられた複数のスクライブ領域25によって互いの間を離間した状態で形成されている。
なお、図5に示す半導体ウェハ20は図示の都合上主要な部位にのみ符号を付しているが、上記の全ての構成を備えた半導体ウェハ20である。
PA1、リング形状のウェハリング30と紫外線の照射により接着力が低下する特性を有するUVテープ等のダイシングシート31とを備えたウェハ保持具32に、反転させた半導体ウェハ20の突起電極16をダイシングシート31に貼り付け、ウェハ保持具32に半導体ウェハ20を固定する。
PA3、半導体基板2の裏面34の研磨後に、半導体ウェハ20を固定したウェハ保持具32をブレード35と図示しない赤外線カメラを備えたダイシング装置に設置し、赤外線カメラによって半導体基板2の回路形成面3側に形成された電極パッド5や再配線9等のパターン形状を半導体基板2の裏面34から認識して半導体ウェハ20のおもて面に存在するスクライブ領域25を認識し、その中心線上にブレード35を位置させる。
その後、個片に分割した半導体ウェハ20をダイシングシート31と共にエクスパンドリングに移し替え、ダイシングシート31に紫外線を照射してその接着力を低下させ、ダイシングシート31を半導体ウェハ20の外周方向へ引き伸ばして各半導体装置1間の隙間を広げ、広げた隙間を用いて画像認識装置を備えた図示しないオートハンドラーにより半導体装置1をダイシングシート31から取り外してテープ&リールまたはトレイに一旦収納する。
上記のトレイ等に一旦収納された半導体装置1を配線基板40に実装するときの実装工程について、図6にPBで示す工程に従って説明する。
図6は実施例1の半導体装置の実装工程を示す説明図である。
このとき、自動実装装置は、その画像認識装置によりハーフミラー42が反射する半導体装置1の封止層15のおもて面に露出している識別突起12の突起端面12a、つまり識別マーク14の形状を認識し、認識した識別マーク14により特定の突起電極16の位置と半導体装置1の方向を認識する。
上記のようにして、本実施例の半導体装置1の配線基板40への実装が行われる。
このように、本実施例の半導体装置1は、その封止層15のおもて面にウェハ状態でポスト10と同時に形成された識別突起12の突起端面12aを露出させ、これを識別マーク14として用いるので、半導体ウェハ20の分割時の切断精度等に関わらずポスト10のポスト端面10aに形成された突起電極16と識別マーク14の位置精度が向上し、ハーフミラー42等を用いて識別マーク14を直接認識すれば特定の突起電極16の位置を精度よく認識することができ、半導体装置1の配線基板40への実装時の位置ずれを防止することができる。
更に、識別突起を回路素子とは非導通として形成するようにしたことによって、識別突起へ入力される外部からの電気ノイズ等のノイズが回路素子に伝わることを防止することができる。
更に、識別マークを半導体装置の封止層の一つの角に設けるようにしたことによって、回路素子に導通する再配線が直下に存在しない比較的広い場所の確保が容易になり、比較的大きな面積を有する識別マークを容易に設けることができ、画像認識装置等による認識をより容易に行うことができる。
図7に示す半導体装置1は、封止層15の封止層側面15bの長さ、つまり1辺の長さが2mmの正方形であり、ポスト10および突起電極16が0.3mmピッチで36個フルマトリックスで配置されている。
また、識別突起12の形成には、前述のように回路素子に導通する再配線9が直下に存在しない場所、回路素子とは非導通の非導通再配線13が形成できる場所で、かつ図8の拡大図に示すように近接するポスト10が接続している再配線9の再配線側面9aと対向する識別突起12が形成される非導通再配線13の非導通再配線側面13aとの隙間Sを封止樹脂の流動を妨げない最小隙間である0.03mm以上とする必要があり、識別突起12と非導通再配線13との各側面間の段差はレジストマスクの形成やエッチングの精度を考慮して0.01mm以上と、側辺14bと封止層15の封止層側面15bとの距離は半導体ウェハ20を個片に分割するときの切断精度を考慮して0.02mm以上とする必要がある。
図9に示す半導体装置1は、1辺の長さが2mmの正方形であり、ポスト10および突起電極16が0.5mmピッチで16個フルマトリックスで配置され、小型ではあるが突起電極16等が比較的大きいピッチのフルマトリックスで配置されているものである。
なお、上記実施例1と同様の部分は、同一の符号を付してその説明を省略する。
図10に示す半導体装置1は、1辺の長さが2mmの正方形であり、ポスト10および突起電極16が0.4mmピッチで25個フルマトリックスで配置され、小型でかつ角部15aの面積が比較的狭いものである。
なお、上記各実施例においては、識別マークの形状を構成する各辺の挟み角は厳密に角を持つ形状として示したが、角の先端に丸みを持たせるようにしてもよい。要は識別マークとして設定した図形(三角形等)を認識できれば足りる。
2 半導体基板
3 回路形成面
4 絶縁層
5 電極パッド
6 パッシベーション膜
7 層間絶縁膜
8 金属薄膜層
9 再配線
9a 再配線側面
10 ポスト
10a ポスト端面
12 識別突起
12a 突起端面
13 非導通再配線
13a 非導通再配線側面
14 識別マーク
14a 近接辺
14b 側辺
15 封止層
15a 角部
15b 封止層側面
16 突起電極
20 半導体ウェハ
21、22 レジスト
25 スクライブ領域
30 ウェハリング
31 ダイシングシート
32 ウェハ保持具
33 砥石
34 裏面
35 ブレード
40 配線基板
42 ハーフミラー
43 配線端子
50 伸長辺
51 伸長部
Claims (7)
- 半導体基板と、前記半導体基板の回路形成面に形成された回路素子と、前記回路素子に電気的に接続する再配線と、前記再配線に電気的に接続するポストと、前記再配線が存在しない領域に形成され、前記回路素子とは電気的に非導通とした非導通再配線と、前記非導通再配線上に形成された柱状の識別突起と、前記再配線と前記ポストと前記非導通再配線と前記識別突起とを封止する封止樹脂で形成された封止層とを備え、
前記封止層のおもて面に露出した前記識別突起の突起端面を、基板への実装時に装置の方向を認識するための識別マークとして用いる半導体装置において、
前記識別突起の非導通再配線と前記識別突起に近接する前記ポストの再配線とが平面視で平行となる箇所を有し、
前記平行箇所の隙間が、前記封止樹脂の流動を妨げない最小隙間である0.03mm以上、前記ポスト間の間隔未満であることを特徴とする半導体装置。 - 請求項1において、
前記識別マークの形状が、指向性図形であることを特徴とする半導体装置。 - 請求項2において、
前記識別マークの形状が、前記近接するポストが接続する再配線の再配線側面と、少なくとも一部が所定の間隔を隔てて平行に形成された近接辺と、前記封止層の角部を構成する2つの封止層側面にそれぞれ平行に形成された側辺とを有することを特徴とする半導体装置。 - 請求項3において、
識別マークの形状が、前記近接辺を斜辺とした三角形形状であることを特徴とする半導体装置。 - 請求項4において、
前記識別マークの形状が、前記それぞれの側辺に平行で、かつ前記再配線側面と所定の間隔を隔てた2つの伸長辺とで構成された伸長部を有することを特徴とする半導体装置。 - 請求項1ないし請求項5のいずれか一項において、
前記識別マークを、前記封止層のおもて面の一つの角部に形成したことを特徴とする半導体装置。 - 半導体基板と、前記半導体基板の回路形成面に形成された回路素子と、前記回路素子に電気的に接続する再配線と、前記再配線に電気的に接続するポストと、前記回路素子とは電気的に非導通とした非導通再配線と、前記非導通再配線上に形成された柱状の識別突起と、前記再配線と前記ポストと前記非導通再配線と前記識別突起とを封止する封止樹脂で形成された封止層とを形成した半導体ウェハを個片に分割して形成する半導体装置の製造方法において、
前記半導体ウェハに、前記再配線が存在しない領域に、前記識別突起の非導通再配線と前記識別突起に近接する前記ポストの再配線とが平面視で平行となる箇所の隙間が、前記封止樹脂の流動を妨げない最小隙間である0.03mm以上、前記ポスト間の間隔未満となるように、前記非導通再配線と、前記再配線とを、前記半導体装置毎に形成する工程と、
前記再配線と前記非導通再配線とに、前記ポストと前記識別突起とを同時に形成する工程と、
前記ポストと前記識別突起とを封止樹脂により封止して封止層を形成する工程と、
前記封止層のおもて面に前記識別突起の突起端面を露出させて、基板への実装時に装置の方向を認識するための識別マークを形成する工程とを備えることを特徴とする半導体装置の製造方法。
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US9781842B2 (en) | 2013-08-05 | 2017-10-03 | California Institute Of Technology | Long-term packaging for the protection of implant electronics |
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