JP5163641B2 - 半導体記憶装置、半導体記憶装置の製造方法、およびパッケージ樹脂形成方法 - Google Patents
半導体記憶装置、半導体記憶装置の製造方法、およびパッケージ樹脂形成方法 Download PDFInfo
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- JP5163641B2 JP5163641B2 JP2009507280A JP2009507280A JP5163641B2 JP 5163641 B2 JP5163641 B2 JP 5163641B2 JP 2009507280 A JP2009507280 A JP 2009507280A JP 2009507280 A JP2009507280 A JP 2009507280A JP 5163641 B2 JP5163641 B2 JP 5163641B2
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Description
以下、図面を参照して本発明の実施の形態に係る強誘電体メモリ(以下、FeRAMという)、およびその製造工程を説明する。この製造工程では、FeRAMデバイスの製造時に、ポリイミドの替わりにノボラック樹脂を形成して、ポリイミド・パシベーション膜の代用とする。ノボラック樹脂を主成分とするパシベーション膜は、ポリイミドよりも低温の熱処理で架橋が進むため(通常、摂氏200度から230度)、FeRAMの製造において有利となる。
(1)ノボラック樹脂を主成分として形成したパシベーション膜は、この後、酸素雰囲気にさらされることで膜強度が劣化することが判明した。
(2)製造工程で強誘電体キャパシタに対しては、リテンション試験(データが正しく記録・読み出しができるか確認する試験)を数回行う。この際、負荷として摂氏200度で4時間の熱エージング処理を行う。この際、空気雰囲気に含まれる酸素の影響で、ノボラック樹脂のパシベーション膜が劣化する。
(3)試験後、FeRAMデバイスは、ダイシング処理されて、1チップ毎にパッケージ樹脂に包まれる。この際、パッケージの金型を熱する際、空気雰囲気にさらされるため、膜強度が劣化する。
図17および図18に、本発明の第1実施形態に係るFeRAMの製造工程の概要を示す。図17は、パッド電極の開口を形成するまでの工程を示すフローチャートである。まず、半導体基板(ウェーハともいう)に、トランジスタ層が形成される(S1)。
その後、PZT膜の保護のためにウェーハ全面に、例えばPVDによる、Al2O3膜を50nm形成する(図示しない)。Al2O3膜形成後、例えば縦型炉による熱処理を行う。熱処理条件は、例えば、摂氏550度、O2流量20リットル/分、60分である。
ただし、図7Bでは、積層膜は省略し、上記積層膜を第1配線層L1(パターン未形成)として図示している。
(1)ノボラック樹脂塗布、(2)プレベーク(低温キュア)、(3)露光処理、(4)ポストベーク(低温キュア)、(5)現像処理、(6)脱水ベーク(低温キュア)、(7)ノボラック樹脂の架橋(本キュア)
を実行する。
すなわち、本実施形態では、露光マスクを介してパッド部に光を投影し、現像液で現像することで、ノボラック樹脂の開口部を形成する。
図19に、第2実施形態に係るFeRAM、およびその製造工程の概要を示す。上記第1実施形態では、強誘電体キャパシタの上層に少なくとも1層の水素および水分に対するバリア膜を形成した上で、パシベーション膜(カバー膜)として窒素雰囲気中で、キュア温度が摂氏200度以下(典型的には180度)にて、ノボラック樹脂の膜を形成した。本実施形態では、このノボラック樹脂を含むパシベーション膜のさらに上層に酸素バリア膜を形成する。本実施形態の他の工程は、第1実施形態と同様である。そこで、ノボラック樹脂形成までの工程の説明は省略する。したがって、図19において、S13までのステップは、第1実施形態の場合(図17)と同様である。また、図19では、S1−S6の工程は、省略した。
図20および図21に、第3実施形態に係るFeRAM、およびその製造工程の概要を示す。上記第1実施形態では、ノボラック樹脂にてカバー膜を形成した。また、第2実施形態では、このノボラック樹脂によるカバー膜のさらに上層に酸素バリア膜を形成した。本実施形態では、さらにパッド電極を通じた試験工程後に、2層の金属膜を形成する。本実施形態の他の工程は、第1実施形態および第2実施形態と同様である。
図16Bに、第3実施形態の変形例を示す。図16Bのように、Ti膜とPd膜とをパッド電極の外輪部を除くすべての領域に形成してもよい。ここで、外輪部とは、パッド電極上のP−TEOS−NSG膜、P−SiN膜の開口領域に形成された、ノボラック樹脂と酸素バリア膜の開口部から所定幅の縁取り領域をいう。この外輪部を除外したすべての領域に前記金属保護膜が配置する。
図22により、本発明の第4実施形態に係るFeRAMの製造工程を示す。本実施形態では、チップダイシングおよびパッケージングの工程を示す。したがって、図22では、第1実施形態から第3実施形態で説明した前工程は省略されている。
上記、第1実施形態から第4実施形態では、強誘電体膜をPZTとして説明した。しかし、強誘電体膜は、PZTに限られず、SBT膜でもよい。これは、具体的には、例えば、PbZr1−XTiXO3膜、Pb1−XLaXZr1−YTiYO3膜、SrBi2(TaXNb1−X)2O9膜、またはBi4Ti2O12膜(ここに、XおよびYは実数)として記述される。
Claims (9)
- 半導体基板上に形成されたトランジスタ層と、
前記トランジスタ層の上方に形成された強誘電体キャパシタ層と、
前記強誘電体キャパシタ層の上方に形成された配線層と
前記配線層の最上層に形成されたパット電極と、
前記パット電極を含む前記配線層を被覆する窒化膜と、
前記窒化膜を被覆するパシベーション膜と、を備え、
前記強誘電体キャパシタ層と前記窒化膜との間に、水分および水素の下層への透過を抑制するバリア膜が少なくとも1層形成され、前記パシベーション膜はノボラック樹脂を含む半導体記憶装置。 - 前記ノボラック樹脂を含むパシベーション膜を被覆し、下層への酸素の透過を抑制する酸素バリア膜をさらに備える請求項1に記載の半導体記憶装置。
- 前記パッド電極上に金属バンプをさらに備える請求項1または2に記載の半導体記憶装置。
- 前記パッド電極を被覆する金属保護膜をさらに備える請求項1から3の何れか一項に記載の半導体記憶装置。
- 前記金属保護膜は、前記パッド電極上に形成された、前記パシベーション膜の開口部から所定幅で前記開口部を縁取りする縁取り領域を除外したすべての領域に配置されている請求項4に記載の半導体記憶装置。
- 前記金属保護膜は、2種以上からなる積層金属膜である請求項4または5に記載の半導体記憶装置。
- 前記ノボラック樹脂の形成は、不活性ガス雰囲気中または窒素雰囲気中で、キュア温度が摂氏170度から190度の間にて40分の熱処理で形成される請求項1から6のいずれか一項に記載の半導体記憶装置。
- 半導体基板上にトランジスタ層を形成する工程と、
前記トランジスタ層の上方に形成された強誘電体キャパシタ層を形成する工程と、
前記強誘電体キャパシタ層の上方に配線層形成する工程と、
前記配線層の最上層にパット電極を形成する工程と、
前記パット電極を含む前記配線層の上方に窒化膜を形成する工程と、
前記窒化膜上にノボラック樹脂を含むパシベーション膜を形成する工程と、を備えるとともに、
前記強誘電体キャパシタ層から前記ノボラック樹脂を含むパシベーション膜との間に、水分および水素の下層への透過を抑制するバリア膜を少なくとも1層形成する工程をさらに備える半導体記憶装置の製造方法。 - 密閉空間を窒素ガス雰囲気または不活性ガス雰囲気に設定する工程と、
前記密閉空間にてパッケージ金型、パット電極を含む配線層を被覆する窒化膜と、前記窒化膜を被覆するパシベーション膜と、を備え、強誘電体キャパシタ層と前記窒化膜との間に、水分および水素の下層への透過を抑制するバリア膜が少なくとも1層形成され、前記パシベーション膜はノボラック樹脂を含む半導体記憶装置を挿入する工程と、
前記パッケージ金型にパッケージ材料を供給する工程と、を備えるパッケージ樹脂形成方法。
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KR101030765B1 (ko) | 2011-04-27 |
WO2008120286A1 (ja) | 2008-10-09 |
US20120195114A1 (en) | 2012-08-02 |
CN101617399B (zh) | 2011-05-18 |
US8921125B2 (en) | 2014-12-30 |
KR20090094464A (ko) | 2009-09-07 |
US8582343B2 (en) | 2013-11-12 |
JPWO2008120286A1 (ja) | 2010-07-15 |
CN101617399A (zh) | 2009-12-30 |
US20090273963A1 (en) | 2009-11-05 |
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