JP7387338B2 - 電気接続部付き基板の製造方法及び液体吐出ヘッド用基板の製造方法 - Google Patents
電気接続部付き基板の製造方法及び液体吐出ヘッド用基板の製造方法 Download PDFInfo
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Description
庇状のAu接続部材は後工程で脱落しやすく、異物となって電気的なショートの原因になったり、液室やインク流路を形成する際の妨げとなったりする場合がある。また、後工程で拡散防止層のアンダーカットが進行し、下層の配線層の腐食を引き起こすことがあり、電気的信頼性が低下することがある。
前記配線層上に、該配線層が露出する開口部を有する絶縁層が設けられ、
前記開口部内に前記拡散防止層が設けられ、
前記接続部材が、前記拡散防止層上に該拡散防止層の外周端部を覆うように設けられている、電気接続部付き基板が提供される。
図3(a)は、基板501上に絶縁酸化膜層515を介して、発熱抵抗体層514、Al配線層509、及び液体吐出エネルギー発生素子504が形成され、その上層に保護膜512が形成された状態を示す。この保護膜512に、次のようにして、外部との電気的接続を行うための開口を形成する。
次に、図3(c)に示すように、フォトリソグラフィによってレジスト層が部分的に除去されたレジストパターン530が形成され、それをマスクとしてエッチングを行って、保護膜512に開口が形成される。この開口内でAl配線層509が部分的に露出した部分が電極部505となる。
基板501としてはシリコンの(100)基板を用いることができる。その基板表面502上には、絶縁酸化膜層515を挟んで、各液体吐出エネルギー発生素子504に電力を供給するための、Alなどからなる電気配線層509が形成されている。最表面には電気配線層509や液体吐出エネルギー発生素子を保護するための保護膜(絶縁層)512が形成されている。さらに、基板裏面である第二の面には酸化膜513を有している。
このような接続部材の形成は、前記第1のレジストマスクの開口部から露出する前記配線層および第1のレジストマスクを覆う拡散防止層を形成する工程と、リフトオフ法により、第1のレジストマスクとともに、第1のレジストマスク上の拡散防止層を除去する工程と、前記配線層上に残った前記拡散防止層を覆う金属層を形成する工程と、前記金属層上に第2のレジストマスクを形成する工程と、前記金属層に対してウェットエッチングを行って、前記拡散防止層の外周端部を覆う接続部材を形成する工程と、を含む本実施形態による製造方法によって行うことができる。
図6(h)は、図5(g)に示す状態の形成が完了した時点に対応する状態を示し、図1のA-A’線に沿った断面に相応する断面図である。
基板501としてはシリコンの(100)基板を用いた。その基板表面502上には、絶縁酸化膜層515を挟んで、Al配線層509を形成した。このAl配線層は、各液体吐出エネルギー発生素子504に電力を供給するための配線である。最表面にはAl配線層509や液体吐出エネルギー発生素子を保護するための、SiNからなる保護膜512を形成した。この保護膜はプラズマCVD法により形成した。さらに、基板裏面である第二の面には、熱酸化により酸化膜513を形成した。
図6(h)は、図5(g)に示す状態の形成が完了した時点に対応する状態を示し、図1のA-A線に沿った断面に相応する断面図である。
502:基板表面である第一の面
503:インク供給口
504:液体吐出エネルギー発生素子
505:電極部
506:接続部材(電極パッド)、Au層
507:流路壁
508:吐出口
509:電気配線層(Al配線層)
510:拡散防止層(TiW層)
511:基板裏面である第二の面
512:保護膜(絶縁層)
513:酸化膜
514:発熱抵抗体層(TaSiN層)
515:絶縁酸化膜層
520:液室
521:密着向上層
522:型材、型材層
523:流路形成部材、流路形成部材層
524:エッチング保護層
530:レジスト層、レジストパターン
Claims (5)
- 配線層と、前記配線層上の拡散防止層と、前記拡散防止層上に、外部との電気的接続を行うための接続部材とを有する、電気接続部付き基板の製造方法であって、
基板上に設けられた配線層上に絶縁層を形成する工程と、
前記絶縁層上に、該絶縁層が露出する開口部を有する第1のレジストマスクを形成する工程と、
前記配線層に達するように、前記第1のレジストマスクの開口部から露出する前記絶縁層に対してエッチングを行う工程と、
前記第1のレジストマスクの開口部から露出する前記配線層および該第1のレジストマスクを覆う拡散防止層を形成する工程と、
リフトオフ法により、前記第1のレジストマスクとともに、該第1のレジストマスク上の拡散防止層を除去する工程と、
前記配線層上に残った前記拡散防止層を覆う金属層を形成する工程と、
前記金属層上に第2のレジストマスクを形成する工程と、
前記金属層に対してウェットエッチングを行って、前記拡散防止層の外周端部を覆う接続部材を形成する工程と、を含む電気接続部付き基板の製造方法。 - 配線層と、前記配線層上の拡散防止層と、前記拡散防止層上に、外部との電気的接続を行うための接続部材とを有する、電気接続部を備えた液体吐出ヘッド用基板の製造方法であって、
基板上に設けられた配線層上に絶縁層を形成する工程と、
前記絶縁層上に、該絶縁層が露出する開口部を有する第1のレジストマスクを形成する工程と、
前記配線層に達するように、前記第1のレジストマスクの開口部から露出する前記絶縁層に対してエッチングを行う工程と、
前記第1のレジストマスクの開口部から露出する前記配線層および該第1のレジストマスクを覆う拡散防止層を形成する工程と、
リフトオフ法により、前記第1のレジストマスクととともに、該第1のレジストマスク上の拡散防止層を除去する工程と、
前記配線層上に残った前記拡散防止層を覆う金属層を形成する工程と、
前記金属層上に第2のレジストマスクを形成する工程と、
前記金属層に対してウェットエッチングを行って、前記拡散防止層の外周端部を覆う接続部材を形成する工程と、を含む液体吐出ヘッド用基板の製造方法。 - 前記金属層がAu層である、請求項2に記載の液体吐出ヘッド用基板の製造方法。
- 前記拡散防止層がTiW層である、請求項2又は3に記載の液体吐出ヘッド用基板の製造方法。
- 前記接続部材を形成する工程の後、
流路形成部材を形成し、該流路形成部材に吐出口および液室を形成する工程をさらに含む、請求項2から4のいずれか一項に記載の液体吐出ヘッド用基板の製造方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2019158553A JP7387338B2 (ja) | 2019-08-30 | 2019-08-30 | 電気接続部付き基板の製造方法及び液体吐出ヘッド用基板の製造方法 |
US17/005,109 US11518164B2 (en) | 2019-08-30 | 2020-08-27 | Substrate with electrical connection section, substrate for liquid ejection head and methods of manufacturing the same |
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JP4151385B2 (ja) | 2001-11-13 | 2008-09-17 | Jfeスチール株式会社 | 異種金属接触腐食による金属材の腐食量予測方法及び寿命予測方法、構造物の設計方法及び金属材の製造方法 |
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JP2003068740A (ja) | 2001-08-30 | 2003-03-07 | Hitachi Ltd | 半導体集積回路装置およびその製造方法 |
JP2007227970A (ja) | 2003-02-28 | 2007-09-06 | Seiko Epson Corp | 半導体装置及びその製造方法 |
WO2007052335A1 (ja) | 2005-11-01 | 2007-05-10 | Hitachi, Ltd. | 半導体圧力センサ |
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