JP6510980B2 - 電荷トラップスプリットゲート埋め込みフラッシュメモリ及び関連する方法 - Google Patents
電荷トラップスプリットゲート埋め込みフラッシュメモリ及び関連する方法 Download PDFInfo
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
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- 239000000463 material Substances 0.000 description 34
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
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- HZXMRANICFIONG-UHFFFAOYSA-N gallium phosphide Chemical compound [Ga]#P HZXMRANICFIONG-UHFFFAOYSA-N 0.000 description 2
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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Description
フラッシュメモリ等の不揮発性メモリは、メモリへの電力がなくなる場合であっても記憶データを保持する。不揮発性メモリセルは、例えば、電荷を電気絶縁浮遊ゲート又は電界効果トランジスタ(FET)の制御ゲートの下にある電荷トラップ層に蓄えることによってデータを記憶する。記憶された電荷は、FETの閾値を制御し、それにより、セルのメモリ状態を制御する。
半導体デバイスを製作する方法が、本開示の態様に従って提供される。本方法によれば、誘電層が、半導体基板の第1の領域及び第2の領域に形成される。ゲート導電層が、半導体基板の第1の領域及び第2の領域に形成される誘電体上に配置され、第2の領域はマスキングされる。スプリットゲートメモリセルが、第1のゲート長で半導体基板の第1の領域に形成される。次に、第1の領域はマスキングされ、第2の領域は、エッチングされて、第2のゲート長を有する論理ゲートを画定する。
これより、本発明の実施形態を単なる例として、対応する参照符号が対応する部分を示す添付概略図面を参照して説明する。さらに、添付図面は、本明細書に組み込まれ、本明細書の一部をなし、本発明の実施形態を示し、説明と共に、本発明の原理を説明し、当業者が本発明を製作し使用できるようにする役割を更に果たす。
本明細書は、本発明の特徴を組み込む1つ又は複数の実施形態を開示する。開示される実施形態は単に、本発明を例示する。本発明の範囲は、開示される実施形態に限定されない。本発明は、本明細書に添付される特許請求の範囲によって規定される。
Claims (12)
- 半導体デバイスを製作する方法であって、
半導体基板の第1の領域、第2の領域、及び第3の領域に誘電層を形成することと、
前記誘電層上に、ゲート導電層を配置することと、
前記第2の領域及び第3の領域をマスキングすることと、
前記第1の領域に、スプリットゲートメモリセルを形成することであって、前記スプリットゲートメモリセルは第1のゲート長を有する、スプリットゲートメモリセルを形成することと、
前記第1の領域をマスキングすることと、
前記第2の領域をエッチングすることであって、それにより、第2のゲート長を有する第1の論理ゲートを画定する、前記第2の領域をエッチングすることと、
前記第3の領域をエッチングすることであって、それにより、第3のゲート長を有する第2の論理ゲートを画定する、前記第3の領域をエッチングすることと、
を含み、
前記誘電層を形成することは、前記スプリットゲートメモリセルの第1の誘電層を前記第1の領域に形成し、前記第1の論理ゲートの第2の誘電層を前記第2の領域に形成し、前記第2の論理ゲートの第3の誘電層を前記第3の領域に形成することを含み、
前記第1の誘電層、前記第2の誘電層、及び前記第3の誘電層は、それぞれ互いに異なる厚さを有し、
前記第1のゲート長は、前記第2のゲート長及び前記第3のゲート長よりも長い、
方法。 - 前記第2の誘電層は、前記第1の誘電層よりも厚く、かつ、前記第3の誘電層は、前記第1の誘電層よりも薄い、請求項1に記載の方法。
- 前記第2の領域及び前記第3の領域をマスキングすることは、ハードマスク層を前記第2の領域及び前記第3の領域上に配置することを含む、請求項1に記載の方法。
- 前記スプリットゲートメモリセルを形成することは、
前記ゲート導電層をエッチングすることであって、それにより、選択ゲートを画定する、前記ゲート導電層をエッチングすることと、
電荷トラップ誘電体を前記選択ゲート上に配置することと、
第2のゲート導電層を前記電荷トラップ誘電体上に配置することと、
前記第2のゲート導電層をエッチングすることであって、それにより、前記選択ゲートに隣接してメモリゲートを画定する、前記第2のゲート導電層をエッチングすることと、
を含む、請求項1に記載の方法。 - 前記電荷トラップ誘電体を配置することは、
誘電層を配置することと、
窒化物層を配置することと、
を含む、請求項4に記載の方法。 - 半導体デバイスであって、
第1のゲート長及び第1の誘電層を有し、半導体基板の第1の領域に形成されるスプリットゲートメモリセルと、
第2のゲート長及び第2の誘電層を有し、前記半導体基板の第2の領域に形成される第1の論理ゲートと、
第3のゲート長及び第3の誘電層を有し、前記半導体基板の第3の領域に形成される第2の論理ゲートと、
を含み、
前記第1のゲート長は、前記第2のゲート長及び前記第3のゲート長とは異なり、
前記第1の誘電層、前記第2の誘電層、及び前記第3の誘電層は、それぞれ互いに異なる厚さを有し、
前記第1のゲート長は、前記第2のゲート長及び前記第3のゲート長よりも長い、
半導体デバイス。 - 前記第2の誘電層は前記第1の誘電層よりも厚く、かつ、前記第3の誘電層は、前記第1の誘電層よりも薄い、請求項6に記載のデバイス。
- 前記スプリットゲートメモリセルは、
選択ゲートと、
前記選択ゲートの側壁上に配置される電荷トラップ誘電体と、
前記電荷トラップ誘電体上に、前記選択ゲートに隣接して配置されるメモリゲートと、
を含む、請求項6に記載のデバイス。 - 前記選択ゲートは、第1のゲート導電層から形成され、前記メモリゲートは、第2のゲート導電層から形成される、請求項8に記載のデバイス。
- 前記電荷トラップ誘電体は、窒化物層及び誘電層を含む、請求項8に記載のデバイス。
- 前記窒化物層はシリコンが豊富な窒化物を含む、請求項10に記載のデバイス。
- 前記第1のゲート長、前記第2のゲート長、及び前記第3のゲート長はそれぞれ、33Xnm、25Xnm、23Xnm、17Xnm、13Xnm、11Xnm、9Xnm、6Xnm、5Xnm、4Xnm、3Xnm、2Xnm、及び1Xnmのうちの1つから選ばれる技術ノードに対応する、請求項6に記載のデバイス。
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US13/715,582 US20140167141A1 (en) | 2012-12-14 | 2012-12-14 | Charge Trapping Split Gate Embedded Flash Memory and Associated Methods |
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PCT/US2013/074386 WO2014093488A1 (en) | 2012-12-14 | 2013-12-11 | Charge trapping split gate embedded flash memory and associated methods |
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US9735245B2 (en) | 2014-08-25 | 2017-08-15 | Taiwan Semiconductor Manufacturing Co., Ltd. | Recessed salicide structure to integrate a flash memory device with a high κ, metal gate logic device |
US9431413B2 (en) * | 2014-11-19 | 2016-08-30 | Taiwan Semiconductor Manufacturing Co., Ltd. | STI recess method to embed NVM memory in HKMG replacement gate technology |
US9589976B2 (en) | 2015-04-16 | 2017-03-07 | Taiwan Semiconductor Manufacturing Co., Ltd. | Structure and method to reduce polysilicon loss from flash memory devices during replacement gate (RPG) process in integrated circuits |
US9905428B2 (en) | 2015-11-02 | 2018-02-27 | Texas Instruments Incorporated | Split-gate lateral extended drain MOS transistor structure and process |
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JP2011040782A (ja) * | 2010-10-18 | 2011-02-24 | Renesas Electronics Corp | 半導体装置の製造方法 |
-
2012
- 2012-12-14 US US13/715,582 patent/US20140167141A1/en not_active Abandoned
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2013
- 2013-12-11 JP JP2015547495A patent/JP6510980B2/ja active Active
- 2013-12-11 WO PCT/US2013/074386 patent/WO2014093488A1/en active Application Filing
- 2013-12-11 DE DE112013005990.8T patent/DE112013005990T5/de active Pending
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2015
- 2015-12-16 US US14/971,531 patent/US9922833B2/en active Active
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US20160111292A1 (en) | 2016-04-21 |
US20140167141A1 (en) | 2014-06-19 |
JP2015537394A (ja) | 2015-12-24 |
DE112013005990T5 (de) | 2015-09-17 |
WO2014093488A1 (en) | 2014-06-19 |
US9922833B2 (en) | 2018-03-20 |
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