JP6330151B2 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- JP6330151B2 JP6330151B2 JP2015537541A JP2015537541A JP6330151B2 JP 6330151 B2 JP6330151 B2 JP 6330151B2 JP 2015537541 A JP2015537541 A JP 2015537541A JP 2015537541 A JP2015537541 A JP 2015537541A JP 6330151 B2 JP6330151 B2 JP 6330151B2
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Description
以下、第1の実施形態に係る半導体装置について、図1を参照しながら説明する。本実施形態では、積層体の界面における絶縁体の形成領域に空間部を形成する構成について説明する。
以下、第2の実施形態に係る半導体装置ついて、図3を参照しながら説明する。本実施形態では、積層体の界面における導電膜の形成領域に空間部を形成する場合について説明する。
以下、第3の実施形態に係る半導体装置ついて、図5を参照しながら説明する。本実施形態では、積層体の界面における絶縁膜の形成領域と導電膜の形成領域とに跨って空間部を形成する場合について説明する。
以下、本開示の第4の実施形態とその変形例について、図7A〜図7Cを参照しながら説明する。本実施形態では、複数の素子を組み合わせて形成される回路ブロックと、2つの積層体の接合界面に設けられた空間部とが互いに重ね合わせられる領域の構成について、第1の実施形態に記載した2つの積層体を一例として説明する。なお、第2の実施形態及び第3の実施形態に対しても同様に、第4の実施形態を適用することができる。
次に、図7Bに示す第1変形例では、それぞれ回路ブロック302よりも平面積が小さい複数の空間部(小空間部)301が、1つ以上の機能素子を含む1つの回路ブロック302の形成領域の全体を覆うように形成されている。この場合、複数の空間部301を合わせた面積の空間部形成領域301Aに対する面積率を高くすることにより、断熱性を確保しながら、回路ブロック302と対向する領域にも、所定の間隔で絶縁膜(図示せず)を形成することができる。このため、図1に示す接続層104、204の互いの接合強度を向上することができる。ここで、空間部形成領域301Aとは、複数の空間部301が設けられた全領域をいう。
次に、図7Cに示す第2変形例では、それぞれが互いに交差する複数の溝部が格子状に形成された空間部301が、1つ以上の機能素子を含む1つの回路ブロック302の形成領域の全体を覆うように形成されている。この場合、例えば、空間部301を形成するための凹部を一方向に長い溝状に形成し、該溝状の凹部の平面内での形成方向を第1積層体と第2積層体とで異ならせることによって、互いの位置が異なる格子状の空間部を形成してもよい。
101,201 半導体基板
102,202 機能素子
103,203 配線層
103a,203a 導電膜
103b,203b 層間絶縁膜
104,204 接続層
104a,204a 絶縁膜
104b,204b 接合電極
104c,204c 導電膜
105,205 絶縁膜
106,206 絶縁膜
107 貫通電極
108 パッド電極
109,209 凹部
200 第2積層体
300 接合界面
301 空間部
301A 空間部形成領域
302 回路ブロック
Claims (15)
- 第1基板と、前記第1基板の主面上に順次形成された、第1素子と、第1配線層と、第1接合電極を含む第1接続層とを有する第1積層体と、
第2基板と、前記第2基板の主面上に順次形成された、第2素子と、第2配線層と、第2接合電極を含む第2接続層とを有する第2積層体とを備え、
前記第1積層体と前記第2積層体とは、前記第1接合電極と前記第2接合電極とが互いに対向して直接接合することにより接合されており、
前記第1積層体と前記第2積層体との接合界面の一部には、前記第1接続層に含まれる第1絶縁膜と、前記第2接続層に含まれる第2絶縁膜とによって、その周囲が囲われた空間部が形成されている半導体装置。 - 第1基板と、前記第1基板の主面上に順次形成された、第1素子と、第1配線層と、第1接合電極を含む第1接続層とを有する第1積層体と、
第2基板と、前記第2基板の主面上に順次形成された、第2素子と、第2配線層と、第2接合電極を含む第2接続層とを有する第2積層体とを備え、
前記第1積層体と前記第2積層体とは、前記第1接合電極と前記第2接合電極とが互いに対向して直接接合することにより接合されており、
前記第1積層体と前記第2積層体との接合界面の一部には、前記第1接続層に含まれ且つ前記第1接合電極と同一の材料からなる第1導電膜と、前記第2接続層に含まれ且つ前記第2接合電極と同一の材料からなる第2導電膜とによって、その周囲全体が囲われた空間部が形成されており、
前記第1導電膜及び前記第2導電膜のうちの少なくとも一方は、電気的に浮遊状態である半導体装置。 - 第1基板と、前記第1基板の主面上に順次形成された、第1素子と、第1配線層と、第1接合電極を含む第1接続層とを有する第1積層体と、
第2基板と、前記第2基板の主面上に順次形成された、第2素子と、第2配線層と、第2接合電極を含む第2接続層とを有する第2積層体とを備え、
前記第1積層体と前記第2積層体とは、前記第1接合電極と前記第2接合電極とが互いに対向して直接接合することにより接合されており、
前記第1積層体と前記第2積層体との接合界面の一部には、前記第1接続層に含まれる第1絶縁膜と、前記第1接続層に含まれ且つ前記第1接合電極と同一の材料からなる第1導電膜とに跨る第1領域、及び前記第2接続層に含まれる第2絶縁膜と、前記第2接続層に含まれ且つ前記第2接合電極と同一の材料からなる第2導電膜とに跨る第2領域とによって、その周囲全体が囲われた空間部が形成されている半導体装置。 - 前記第1導電膜及び前記第2導電膜のうちの少なくとも一方は、電気的に浮遊状態である請求項3に記載の半導体装置。
- 平面視において、前記第1素子は、当該第1素子が前記空間部の下方に位置するように、前記第1配線層に形成されている請求項1〜4のうちのいずれか1項に記載の半導体装置。
- 前記第1素子が複数配置されて1つの回路ブロックが形成されており、
前記空間部は1つの領域として形成され、
平面視において、前記回路ブロックは、当該回路ブロックが前記空間部の下方に位置するように、前記第1配線層に形成されている請求項1〜4のうちのいずれか1項に記載の半導体装置。 - 第1基板と、前記第1基板の主面上に順次形成された、第1素子と、第1配線層と、第1接合電極を含む第1接続層とを有する第1積層体と、
第2基板と、前記第2基板の主面上に順次形成された、第2素子と、第2配線層と、第2接合電極を含む第2接続層とを有する第2積層体とを備え、
前記第1積層体と前記第2積層体とは、前記第1接合電極と前記第2接合電極とが互いに対向して直接接合することにより接合されており、
前記第1積層体と前記第2積層体との接合界面の一部には、空間部が形成されており、
前記第1素子が複数配置されて1つの回路ブロックが形成されており、
前記空間部は、複数の小空間部の集合体として形成され、
平面視において、前記回路ブロックは、前記複数の小空間部に跨ると共に前記空間部の下方に位置する前記第1配線層に形成されている半導体装置。 - 第1基板と、前記第1基板の主面上に順次形成された、第1素子と、第1配線層と、第1接合電極を含む第1接続層とを有する第1積層体と、
第2基板と、前記第2基板の主面上に順次形成された、第2素子と、第2配線層と、第2接合電極を含む第2接続層とを有する第2積層体とを備え、
前記第1積層体と前記第2積層体とは、前記第1接合電極と前記第2接合電極とが互いに対向して直接接合することにより接合されており、
前記第1積層体と前記第2積層体との接合界面の一部には、空間部が形成されており、
前記第1素子が複数配置されて1つの回路ブロックが形成されており、
前記空間部は、複数の溝部が格子状に形成され、
前記格子状に形成された複数の溝部は全体として閉鎖空間を形成し、
平面視において、前記回路ブロックは、当該回路ブロックが前記空間部の下方に位置するように、前記第1配線層に形成されている半導体装置。 - 前記第1基板及び前記第2基板のうちの少なくとも一方には、当該基板を貫通する貫通電極が設けられており、
前記第1配線層及び前記第2配線層のうちの少なくとも一方は、対応する前記貫通電極と電気的に接続されている請求項1〜8のうちいずれか1項に記載の半導体装置。 - 前記第1素子及び前記第2素子のうちの少なくとも一方は、抵抗、容量、インダクタ、ユニポーラトランジスタ、バイポーラトランジスタ、メモリ素子及び光電変換素子のうちの少なくとも1つを含む請求項1〜9のうちいずれか1項に記載の半導体装置。
- 前記空間部の高さは、5nm以上且つ2000nm以下である請求項1〜10のうちいずれか1項に記載の半導体装置。
- 前記空間部の幅は、0.1μm以上且つ100μm以下である請求項1〜11のうちいずれか1項に記載の半導体装置。
- 第1基板の主面上に、少なくとも1つの第1素子と、第1配線層と、第1接合電極及び第1絶縁膜を含む第1接続層とが順次形成された第1積層体を形成する工程(a)と、
第2基板の主面上に、少なくとも1つの第2素子と、第2配線層と、第2接合電極及び第2絶縁膜を含む第2接続層とが順次形成された第2積層体を形成する工程(b)と、
前記第1絶縁膜及び前記第2絶縁膜のうちの少なくとも一方の表面に凹部を形成する工程(c)と、
前記工程(c)よりも後に、前記第1接続層と前記第2接続層とが互いに対向し、且つ、前記第1接合電極と前記第2接合電極とが互いに対向するように、前記第1積層体と前記第2積層体とを直接接合する工程(d)とを備え、
前記工程(d)において、前記第1積層体と前記第2積層体との接合界面に、前記凹部の周囲が前記第1絶縁膜及び第2絶縁膜によって覆われた空間部を形成する半導体装置の製造方法。 - 第1基板の主面上に、少なくとも1つの第1素子と、第1配線層と、第1接合電極、第1絶縁膜及び第1導電膜を含む第1接続層とが順次形成された第1積層体を形成する工程(a)と、
第2基板の主面上に、少なくとも1つの第2素子と、第2配線層と、第2接合電極、第2絶縁膜及び第2導電膜を含む第2接続層とが順次形成された第2積層体を形成する工程(b)と、
前記第1導電膜及び前記第2導電膜のうちの少なくとも一方の表面に凹部を形成する工程(c)と、
前記工程(c)よりも後に、前記第1接続層と前記第2接続層とが互いに対向し、且つ、前記第1接合電極と前記第2接合電極とが互いに対向するように、前記第1積層体と前記第2積層体とを直接接合する工程(d)とを備え、
前記工程(d)において、前記第1積層体と前記第2積層体との接合界面に、前記凹部の周囲全体が前記第1導電膜及び前記第2導電膜によって覆われた空間部を形成し、
前記第1導電膜及び前記第2導電膜のうちの少なくとも一方は、電気的に浮遊状態である半導体装置の製造方法。 - 第1基板の主面上に、少なくとも1つの第1素子と、第1配線層と、第1接合電極、第1絶縁膜及び第1導電膜を含む第1接続層とが順次形成された第1積層体を形成する工程(a)と、
第2基板の主面上に、少なくとも1つの第2素子と、第2配線層と、第2接合電極、第2絶縁膜及び第2導電膜を含む第2接続層とが順次形成された第2積層体を形成する工程(b)と、
前記第1絶縁膜及び前記第1導電膜並びに前記第2絶縁膜及び前記第2導電膜のうちの少なくとも一方の表面に、当該絶縁膜及び当該導電膜に跨がる領域に凹部を形成する工程(c)と、
前記工程(c)よりも後に、前記第1接続層と前記第2接続層とが互いに対向し、且つ、前記第1接合電極と前記第2接合電極とが互いに対向するように、前記第1積層体と前記第2積層体とを直接接合する工程(d)とを備え、
前記工程(d)において、前記第1積層体と前記第2積層体との接合界面に、前記凹部の周囲全体が、前記第1絶縁膜及び前記第1導電膜並びに前記第2絶縁膜及び前記第2導電膜によって覆われた空間部を形成する半導体装置の製造方法。
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