JP2012253193A - 超音波スキャンに基づくシリコン貫通配線(tsv)におけるボイドの存在の推定 - Google Patents
超音波スキャンに基づくシリコン貫通配線(tsv)におけるボイドの存在の推定 Download PDFInfo
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Abstract
【解決手段】 ボード面にわたって超音波スキャンをすると、(はんだ)バンプ等が物理的な遮蔽物として超音波を散乱させてしまい、超音波スキャンによる測定を妨げてしまう。そこで、これら複数のTSVの中から、テスト要素グループ(TEG)に属する単数または複数のTSVを選び出すにあたって、物理的な遮蔽物を少なく存在するように選び出す。
【選択図】 図4
Description
「超音波」とは、一般的に、人間の耳には聞こえない20kHz以上の周波数の音のことをいい、医学における超音波エコー、洗浄器、魚群探知機、バックソナーなど、様々な技術的な利用がなされている。本発明の実施例でも20kHz以上の周波数を用いることを想定している。複数の異なる周波数の波の成分が含まれたパルス波が用いられる場合もある。
超音波の第1の特性として、伝播速度が電波などに比べて著しく遅い。伝播速度が速い順に並べると、固体>液体>空気 の順となり、伝播媒体そのものの影響が大きい。空中では固体の約15分の1の速度となる。超音波の伝播速度vは、音の周波数とは無関係であって、対象となる物質の密度と弾性率の比で決まり、以下の式(1)で決まる。
伝播速度v(m/秒)=√弾性率(Pa)/密度(kg/m3) (1)
図4は、本発明であるところの、超音波スキャンに基づいて、シリコン貫通配線(TSV)におけるボイドの存在を推定する方法の基本原理を示す図である。
Acoustic Microscope)を用いて、音響レンズ等によって細く絞った230MHz〜400MHzの超音波(を主成分とする)ビームを、試料に対してY方向をずらしながらX方向に1次元的にスキャンをして、超音波の送信と反射波の受信とを繰り返すことで、ボード100の構造を深さ方向に高い分解能で解析することに成功している。
Claims (12)
- 超音波スキャンに基づいて、シリコン貫通配線(TSV)におけるボイドの存在を推定する方法であって、
複数のTSVが配列されているボードを用意するステップと、
これら複数のTSVの中から、テスト要素グループ(TEG)に属する単数または複数のTSVを選び出すステップであって、ボード面にわたって超音波でスキャンするにあたってこのTEGの周囲における物理的な遮蔽物は、このTEGには属していない他のTSVの周囲における物理的な遮蔽物よりも少なく存在している、この選び出すステップと、
TEGに属している少なくとも1つのTSVを、ボード面にわたってスキャンするステップと、
スキャンするステップの結果に基づいて、TEGに属していない他のTSVにボイドが存在するであろうと推定するステップと、を有する、
方法。 - TEGには属していない他のTSVの周囲における物理的な遮蔽物は、はんだバンプである、請求項1に記載の方法。
- さらに、はんだバンプの下側に、ボードを覆ってしまうアルミまたは銅のパッドが設けられている、請求項2に記載の方法。
- テスト要素グループ(TEG)に属しているTSVが複数あって、その配列されているピッチが、TEGに属していない他のTSVが配列されているピッチよりも狭い、請求項1に記載の方法。
- テスト要素グループ(TEG)に属している少なくとも1つのTSVの径が、TEGに属していない他のTSVの径よりも小さい、請求項1に記載の方法。
- テスト要素グループ(TEG)に属していない他のTSVが、40μm±20μmのピッチおよび25μm±10μmの径をもって配列されている、請求項1に記載の方法。
- テスト要素グループ(TEG)に属している少なくとも1つのTSVが、15μm〜20μm±10μmの径であり、超音波スキャンに用いる超音波の周波数の主成分が、230MHz〜400MHzである、請求項6に記載の方法。
- 面にわたっての超音波スキャンに基づいて、シリコン貫通配線(TSV)におけるボイドの存在を推定するために、複数のTSVが配列されているボードであって、
これら複数のTSVの中から、テスト要素グループ(TEG)に属する単数または複数のTSVが選び出されており、ボード面にわたって超音波でスキャンするにあたってこのTEGの周囲における物理的な遮蔽物は、このTEGには属していない他のTSVの周囲における物理的な遮蔽物よりも少なく存在している、
ボード。 - TEGには属していない他のTSVの周囲における物理的な遮蔽物は、はんだバンプであり、
さらに、はんだバンプの下側に、ボードを覆ってしまうアルミまたは銅のパッドが設けられている、請求項8に記載のボード。 - テスト要素グループ(TEG)は、ボード上において、ボードに配列されている複数のTSVからは独立して設けられている、請求項8に記載のボード。
- 超音波スキャンに基づいて、シリコン貫通配線(TSV)におけるボイドの存在を推定する装置であって、
用意されるところの、複数のTSVが配列されているボードについて、
これら複数のTSVの中から、テスト要素グループ(TEG)に属する単数または複数のTSVを選び出すことであって、ボード面にわたって超音波でスキャンするにあたってこのTEGの周囲における物理的な遮蔽物は、このTEGには属していない他のTSVの周囲における物理的な遮蔽物よりも少なく存在している、この選び出すことと、
TEGに属している少なくとも1つのTSVを、ボード面にわたってスキャンすることと、
スキャンすることの結果に基づいて、TEGに属していない他のTSVにボイドが存在するであろうと推定することとを、自動的に実行する、
装置。 - 用意されるところのボードには、TEGに属している少なくとも1つのTSVを覆ってしまうアルミまたは銅のパッドが設けられている、請求項11に記載の装置。
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JP2011124548A JP5710385B2 (ja) | 2011-06-02 | 2011-06-02 | 超音波スキャンに基づくシリコン貫通配線(tsv)におけるボイドの存在の推定 |
US13/484,347 US20120304773A1 (en) | 2011-06-02 | 2012-05-31 | Estimation of presence of void in through silicon via (tsv) based on ultrasound scanning |
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DE102016012000A1 (de) | 2015-10-08 | 2017-04-13 | Hitachi Power Solutions Co., Ltd. | Fehlerinspektionsverfahren und -vorrichtung |
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SG11201702573VA (en) * | 2014-09-29 | 2017-04-27 | Manjusha Mehendale | Non-destructive acoustic metrology for void detection |
KR20180085119A (ko) | 2017-01-17 | 2018-07-26 | 삼성전자주식회사 | 기판 가공 방법 및 그를 이용한 반도체 소자의 제조 방법 |
CN108760885A (zh) * | 2018-06-14 | 2018-11-06 | 德淮半导体有限公司 | 超声波扫描方法和超声波扫描装置 |
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DE102016012000A1 (de) | 2015-10-08 | 2017-04-13 | Hitachi Power Solutions Co., Ltd. | Fehlerinspektionsverfahren und -vorrichtung |
US10354372B2 (en) | 2015-10-08 | 2019-07-16 | Hitachi Power Solutions Co., Ltd. | Defect inspection method and apparatus |
US10529068B2 (en) | 2015-10-08 | 2020-01-07 | Hitachi Power Solutions Co., Ltd. | Defect inspection method and apparatus |
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