JP2011249559A - 半導体装置及びその製造方法 - Google Patents
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- H01L29/76—Unipolar devices, e.g. field effect transistors
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- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/792—Field effect transistors with field effect produced by an insulated gate with charge trapping gate insulator, e.g. MNOS-memory transistors
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Abstract
【解決手段】半導体装置は、基板10と、下部ゲート層BGと、積層体と、ダミー電極層DWLと、絶縁膜30と、チャネルボディ20,45とを備えた。下部ゲート層BGは、基板10上に設けられた。積層体は、下部ゲート層BG上にそれぞれ交互に積層された複数の絶縁層と複数の電極層WLとを有する。ダミー電極層DWLは、下部ゲート層BGと積層体との間に設けられ、電極層WLと同じ材料からなり、各々の電極層WLよりも厚い。絶縁膜30は、積層体及びダミー電極層を貫通して形成されたホールMHの側壁に設けられた電荷蓄積膜を含む。チャネルボディ20,45は、ホールMH内における絶縁膜30の内側に設けられた。
【選択図】図1
Description
図2は、図1におけるメモリセルMCが設けられた部分の拡大断面図である。
データの消去時、選択ブロックにおけるダミー電極層DWLには、Vera_passが与えられる。Vera_passは、ダミーセルの閾値電圧の変動を抑える電位であり、例えば5Vほどである。あるいは、ダミーセルの閾値電圧が低くシフトしてもメモリセルの読み出し動作には影響しないため、データの消去時、ダミー電極層DWLの電位を0V(グランド電位)にしてもよい。
非選択ブロックにおける電極層WL及びダミー電極層DWLはフローティング状態にされる。これにより、チャネルボディ20の電位の上昇に伴い、カップリングによって電極層WLの電位も上昇しメモリセルの電荷蓄積層32から電子は引き抜かれない。
Claims (5)
- 基板と、
前記基板上に設けられた下部ゲート層と、
前記下部ゲート層上にそれぞれ交互に積層された複数の絶縁層と複数の電極層とを有する積層体と、
前記下部ゲート層と前記積層体との間に設けられ、前記電極層と同じ材料からなり、各々の前記電極層よりも厚いダミー電極層と、
前記積層体及び前記ダミー電極層を貫通して形成されたホールの側壁に設けられた電荷蓄積膜を含む絶縁膜と、
前記ホール内における前記絶縁膜の内側に設けられたチャネルボディと、
を備えたことを特徴とする半導体装置。 - 前記チャネルボディは、前記積層体の積層方向に延びる一対の柱状部と、前記下部ゲート層に埋め込まれ、前記一対の柱状部をつなぐ連結部とを有するU字状に形成されたことを特徴とする請求項1記載の半導体装置。
- 基板上に、下部ゲート層を形成する工程と、
前記下部ゲート層上に、ダミー電極層を形成する工程と、
前記ダミー電極層上に、複数の絶縁層と、前記ダミー電極層と同じ材料の複数の電極層とをそれぞれ交互に積層して積層体を形成する工程と、
前記複数の絶縁層及び前記複数の電極層を同じガスを用いて一括してエッチングし、前記積層体を貫通して前記ダミー電極層に達する第1のホールを形成する工程と、
前記ダミー電極層における前記第1のホールの底部の下の部分を、前記第1のホールを形成するときとは異なるガスを用いてエッチングし、前記ダミー電極層に第2のホールを形成する工程と、
を備えたことを特徴とする半導体装置の製造方法。 - 前記ダミー電極層を、各々の前記電極層よりも厚くすることを特徴とする請求項3記載の半導体装置の製造方法。
- 前記ダミー電極層及び前記積層体を形成する前に、前記下部ゲート層に凹部を形成する工程と、
前記ダミー電極層及び前記積層体を形成する前に、前記凹部を前記ダミー電極層と異なる材料の犠牲膜で埋める工程と、
前記第1のホール及び前記第2のホールを形成した後、前記第1のホール及び前記第2のホールを通じて前記犠牲膜を除去し、前記第1のホール、前記第2のホール及び前記凹部をつなげる工程と、
をさらに備えたことを特徴とする請求項3または4に記載の半導体装置の製造方法。
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JP2014175348A (ja) * | 2013-03-06 | 2014-09-22 | Toshiba Corp | 不揮発性半導体記憶装置 |
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JP2014187191A (ja) * | 2013-03-22 | 2014-10-02 | Toshiba Corp | 半導体記憶装置の製造方法及び半導体記憶装置 |
JP2016514370A (ja) * | 2013-03-28 | 2016-05-19 | インテル・コーポレーション | オン電流およびセルピラー製造を制御する、縦型nandストリングのためのタングステンサリサイドゲートソース |
JP2015028990A (ja) * | 2013-07-30 | 2015-02-12 | 株式会社東芝 | 不揮発性記憶装置 |
CN115295483A (zh) * | 2022-08-02 | 2022-11-04 | 武汉新芯集成电路制造有限公司 | 半导体器件及其制作方法 |
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US20110291178A1 (en) | 2011-12-01 |
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