JP5175526B2 - 不揮発性半導体記憶装置及びその製造方法 - Google Patents
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- G—PHYSICS
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- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0009—RRAM elements whose operation depends upon chemical change
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- H—ELECTRICITY
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B63/00—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices
- H10B63/20—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices comprising selection components having two electrodes, e.g. diodes
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- H—ELECTRICITY
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B63/00—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices
- H10B63/80—Arrangements comprising multiple bistable or multi-stable switching components of the same type on a plane parallel to the substrate, e.g. cross-point arrays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B63/00—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices
- H10B63/80—Arrangements comprising multiple bistable or multi-stable switching components of the same type on a plane parallel to the substrate, e.g. cross-point arrays
- H10B63/84—Arrangements comprising multiple bistable or multi-stable switching components of the same type on a plane parallel to the substrate, e.g. cross-point arrays arranged in a direction perpendicular to the substrate, e.g. 3D cell arrays
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C2213/00—Indexing scheme relating to G11C13/00 for features not covered by this group
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- G—PHYSICS
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- G11C2213/70—Resistive array aspects
- G11C2213/72—Array wherein the access device being a diode
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/011—Manufacture or treatment of multistable switching devices
- H10N70/061—Shaping switching materials
- H10N70/063—Shaping switching materials by etching of pre-deposited switching material layers, e.g. lithography
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- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/20—Multistable switching devices, e.g. memristors
- H10N70/24—Multistable switching devices, e.g. memristors based on migration or redistribution of ionic species, e.g. anions, vacancies
- H10N70/245—Multistable switching devices, e.g. memristors based on migration or redistribution of ionic species, e.g. anions, vacancies the species being metal cations, e.g. programmable metallization cells
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- H10N70/826—Device geometry adapted for essentially vertical current flow, e.g. sandwich or pillar type devices
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- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
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Description
図1は、本発明の第1の実施の形態に係る不揮発性メモリのブロック図である。
図2は、メモリセルアレイ1の一部の斜視図、図3は、図2におけるI−I′線で切断して矢印方向に見たメモリセル1つ分の断面図である。
次に、図10に示した本実施形態に係る不揮発性メモリの製造方法について説明する。
図17は、本発明の一実施形態に係る不揮発性半導体記憶装置のメモリセル部分を示す断面図である。
上述した本実施形態に係るメモリを製造する際には、まず、シリコン基板51の上に、層間絶縁層52を形成し、下層配線を形成する。その後、各メモリセルアレイ層MA1〜MA4を形成してセルアレイブロックを形成する。これと併行して、第1のセルアレイMA1が形成された後に、絶縁層を形成した後、第2・3層L23のビアを形成する。また、第2及び第3のセルアレイ層MA2,MA3が形成された後に、絶縁層を形成した後、第4・5層L45のビアを形成する。更に、第4のセルアレイ層MA4が形成された後に、絶縁層を形成した後、第6層L6のビアを形成すれば良い。
なお、上述した実施形態では、ワード線WLとビット線BLの引き出し部がメモリブロックの両側に引き出されていたが、例えば図19に示すように、複数のセルアレイブロックMCAがマトリクス状に配列されている場合、ビット線の引き出し領域ZBをセルアレイブロックMCAの両側に設け、ワード線の引き出し部ZWをセルアレイブロックMCAの一方の側にのみ設けるようにする。
なお、本発明は、メモリセルの構造に特に限定されるものではなく、相変化メモリ素子、MRAM素子、PFRAM、RRAM等、種々のクロスポイント型の多層メモリに適用可能である。
Claims (5)
- 半導体基板と、
この半導体基板上に形成されて、複数の第1の配線、これら複数の第1の配線と交差する複数の第2の配線、及び前記第1及び第2の配線の交差部で両配線間に接続されたメモリセルを有するセルアレイ層を複数積層してなるセルアレイブロックと、
前記各セルアレイ層の前記第1又は第2の配線と前記半導体基板とをそれぞれ個別に接続する前記セルアレイ層の積層方向に延びる複数のビアと
を有し、
前記ビアは、複数の前記セルアレイ層に跨って連続的に形成され、
前記複数のビアは、第1のビア、並びに、当該第1のビアと下端位置及び上端位置が等しい第2のビアを含み、前記第1のビア及び前記第2のビアは前記第1の配線が延びる方向に配列され、
前記第1のビアに接続された前記第1の配線と前記第2のビアに接続された前記第1の配線は異なるセルアレイ層に属し、前記第1のビアに接続された第1の配線は前記第2のビアに接続されておらず、前記第2のビアに接続された第1の配線は前記第1のビアに接続されておらず且つ前記第1のビアを避ける迂回パターンとなるように形成され、
前記第1及び第2の配線は、前記ビアに接続されている箇所に前記セルアレイ層の積層方向の断面の幅が不連続に変化する段差部分を有する
ことを特徴とする不揮発性半導体記憶装置。 - 前記ビアと接続される前記第1又は第2の配線が、これよりも下層の前記第1又は第2の配線と接続される他の前記ビアを避ける迂回パターンとなるように形成されている
ことを特徴とする請求項1記載の不揮発性半導体記憶装置。 - 前記ビアの上端位置は、それよりも上のセルアレイ層のメモリセルの下端位置よりも下に位置している
ことを特徴とする請求項1又は2記載の不揮発性半導体記憶装置。 - 前記メモリセルは、
抵抗値の変化で情報を記憶する可変抵抗素子と、
この可変抵抗素子と直列に接続される非オーミック素子とを積層してなる
ことを特徴とする請求項1〜3のいずれか1項記載の不揮発性半導体記憶装置。 - 半導体基板の上に、複数の第1の配線、これら複数の第1の配線と交差する複数の第2の配線、及び前記第1及び第2の配線の交差部で両配線間に接続されたメモリセルを有するセルアレイ層を複数多層に形成してセルアレイブロックを形成する工程と、
前記セルアレイブロックの形成と併行して複数のセルアレイ層が形成された後にこれら複数のセルアレイ層を貫通すると共にそれぞれが異なるセルアレイ層の第1又は第2の配線を貫通する貫通孔を同時に形成する工程と、
前記同時に形成された貫通孔に導電性材料を充填して前記各セルアレイ層の前記第1又は第2の配線と前記半導体基板とをそれぞれ個別に接続する前記セルアレイ層の積層方向に延びる複数のビアを形成する工程と
を有し、
前記複数のビアは、第1のビア、並びに、当該第1のビアと下端位置及び上端位置が等しい第2のビアを含み、前記第1のビア及び前記第2のビアは前記第1の配線が延びる方向に配列され、
前記第1のビアに接続された前記第1の配線と前記第2のビアに接続された前記第1の配線は異なるセルアレイ層に属し、前記第1のビアに接続された第1の配線は前記第2のビアに接続されておらず、前記第2のビアに接続された第1の配線は前記第1のビアに接続されておらず且つ前記第1のビアを避ける迂回パターンとなるように形成され、
前記複数のビア形成する工程後の前記第1及び第2の配線は、前記ビアに接続されている箇所に前記セルアレイ層の積層方向の断面の幅が不連続に変化する段差部分を有する
ことを特徴とする不揮発性半導体装置の製造方法。
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JP2007303668A JP5175526B2 (ja) | 2007-11-22 | 2007-11-22 | 不揮発性半導体記憶装置及びその製造方法 |
US12/275,682 US8183602B2 (en) | 2007-11-22 | 2008-11-21 | Nonvolatile semiconductor memory device including via-holes continuously formed through plural cell array layers |
US13/454,625 US8648471B2 (en) | 2007-11-22 | 2012-04-24 | Nonvolatile semiconductor memory device including a via-hole with a narrowing cross-section and method of manufacturing the same |
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