JP4486032B2 - メモリ素子の製造方法 - Google Patents
メモリ素子の製造方法 Download PDFInfo
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- JP4486032B2 JP4486032B2 JP2005352408A JP2005352408A JP4486032B2 JP 4486032 B2 JP4486032 B2 JP 4486032B2 JP 2005352408 A JP2005352408 A JP 2005352408A JP 2005352408 A JP2005352408 A JP 2005352408A JP 4486032 B2 JP4486032 B2 JP 4486032B2
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- 238000000034 method Methods 0.000 title claims description 40
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000758 substrate Substances 0.000 claims description 49
- 239000004065 semiconductor Substances 0.000 claims description 42
- 230000005641 tunneling Effects 0.000 claims description 29
- 239000012535 impurity Substances 0.000 claims description 23
- 150000002500 ions Chemical class 0.000 claims description 19
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 238000005530 etching Methods 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 52
- 229920002120 photoresistant polymer Polymers 0.000 description 20
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 4
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000001259 photo etching Methods 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823878—Complementary field-effect transistors, e.g. CMOS isolation region manufacturing related aspects, e.g. to avoid interaction of isolation region with adjacent structure
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H01L29/1025—Channel region of field-effect devices
- H01L29/1029—Channel region of field-effect devices of field-effect transistors
- H01L29/1033—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure
- H01L29/1054—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure with a variation of the composition, e.g. channel with strained layer for increasing the mobility
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- Y10S438/00—Semiconductor device manufacturing: process
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- Insulated Gate Type Field-Effect Transistor (AREA)
- Thin Film Transistor (AREA)
Description
従来の積層型フラッシュEEPROMは、図1に示したように、P型半導体基板1上にトンネリング酸化膜2、フローティングゲート3、層間ポリ酸化膜4及びコントロールゲート5が順次形成される。そして、前記フローティングゲート3及びコントロールゲート5の両側の前記p型半導体基板1に高濃度のn型不純物イオン注入によってソース/ドレイン領域6、7が形成される。
第一に、スプリットゲートセルのコントロールゲートと、フローティングゲート共に垂直形態で構成されるので、セルサイズを最大限減らすことができ、さらに集積度の向上を図ることができる。
第二に、非常に高いカップリング比を実現できることで、プログラミング時に電圧を低めることができる。
第三に、スプリットゲートセルのコントロールゲートと、フローティングゲート共に垂直形態で構成しながらソースジャンクションとドレインジャンクションの間のチャンネル領域でコントロールゲートと、フローティングゲートとがオーバーラップするので消去特性が向上する。
図3aに示したように、素子分離膜(図示せず)によってアクティブ領域と、フィールド領域とが定められた半導体基板200上に、バッファ酸化膜201と、絶縁膜202とを順次蒸着し、前記絶縁膜202の上部に第1フォトレジスト215を塗布し、露光及び現像工程で前記第1フォトレジスト215をパターニングする。ここで、前記絶縁膜202は窒化膜を用いる。
もし、CVD方法で形成する場合には、前記絶縁膜202を含む基板の全面にトンネリング酸化膜202が形成され、熱酸化工程で形成する場合は、トレンチ内の半導体基板200にのみ形成される。図3bでは熱酸化工程によってトンネリング酸化膜203が形成されることを示す。
したがって、消去特性を向上させることのできる本発明の第2実施例を説明する。
図4aに示したように、素子分離膜(図示せず)によってアクティブ領域と、フィールド領域とが定められた半導体基板300上にバッファ酸化膜301と、絶縁膜302とを順次蒸着し、前記絶縁膜302の上部に第1フォトレジスト315を塗布し、露光及び現像工程で前記第1フォトレジスト315をパターニングする。ここで、前記絶縁膜302として窒化膜を用いる。
もし、CVD方法で形成する場合には、前記絶縁膜302を含む基板の全面にトンネリング酸化膜302が形成され、熱酸化工程で形成する場合はトレンチ内の半導体基板300にのみ形成される。図4bでは熱酸化工程によってトンネリング酸化膜303が形成されることを示したものである。
そして、前記半導体基板300の全面に導電層を蒸着し、エッチバックして、前記導電層が前記トレンチ内にのみ残るように前記導電層をエッチバックして、前記誘電体膜305の上部にコントロールゲート層306を形成する。その後、前記コントロールゲート層306の上部表面を酸化させ、酸化膜307を形成する。
201、301 バッファ酸化膜
202、302 絶縁膜
203、303 トンネリング酸化膜
204、304 フローティングゲート層
205、208、305、308 誘電体膜
206、306 コントロールゲート層
207、211、307、311 酸化膜
209、309 ソースジャンクション
210、310 ソース電極膜
215、216、315、316、317 フォトレジスト
Claims (5)
- 半導体基板上に絶縁膜を蒸着し、前記絶縁膜と半導体基板を所定の深さでエッチングして第1トレンチを形成する段階と、
前記第1トレンチ内にトンネリング酸化膜を形成する段階と、
前記第1トレンチ内の前記トンネリング酸化膜上にフローティングゲート層を形成する段階と、
前記フローティングゲート層の中央部分を所定の深さでエッチングして凹部を形成する段階と、
前記フローティングゲート層上に誘電体膜を形成する段階と、
前記誘電体膜上の前記第1トレンチ内にコントロールゲート層を形成する段階と、
前記コントロールゲート層の表面に酸化膜を形成する段階と、
前記第1トレンチ内の酸化膜、コントロールゲート層、誘電体膜、フローティングゲート層及びトンネリング酸化膜の中央部分を除去して、第2トレンチを形成して、フローティングゲート及びコントロールゲートを形成する段階と、前記フローティングゲートは、前記コントロールゲートに対向する面に屈曲部を有し、前記コントロールゲートは、前記フローティングゲートに対向する面に前記フローティングゲートの屈曲部に対応する屈曲部を有し、
前記第2トレンチの側壁にバッファ誘電体膜を形成する段階と、
前記第2トレンチの下部の前記半導体基板に不純物イオンを注入し、ソースジャンクションを形成する段階と、
前記ソースジャンクションに連結されるよう前記第2トレンチ内にソース電極を形成する段階と、
前記絶縁膜を除去し、前記絶縁膜が除去された半導体基板に不純物イオンを注入してドレインジャンクションを形成する段階と、を有することを特徴とするメモリ素子の製造方法。 - 前記半導体基板と前記絶縁膜との間にバッファ酸化膜を更に形成することを特徴とする請求項1に記載のメモリ素子の製造方法。
- 前記ソース及びドレインジャンクションは、同一の導電型の互いに異なる種類の不純物イオンを注入して形成することを特徴とする請求項1に記載のメモリ素子の製造方法。
- 前記トンネリング酸化膜は、CVD又は熱酸化工程で形成することを特徴とする請求項1に記載のメモリ素子の製造方法。
- 前記フローティングゲート層の凹部に対応して前記コントロールゲート層が形成され、前記フローティングゲート層と、前記コントロールゲート層とが側面でオーバーラップするようにすることを特徴とする請求項1に記載のメモリ素子の製造方法。
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KR1020040118276A KR100607785B1 (ko) | 2004-12-31 | 2004-12-31 | 스플릿 게이트 플래시 이이피롬의 제조방법 |
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JP2006191004A JP2006191004A (ja) | 2006-07-20 |
JP4486032B2 true JP4486032B2 (ja) | 2010-06-23 |
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US (5) | US7300846B2 (ja) |
JP (1) | JP4486032B2 (ja) |
KR (1) | KR100607785B1 (ja) |
CN (1) | CN100517760C (ja) |
DE (1) | DE102005061199B4 (ja) |
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Publication number | Priority date | Publication date | Assignee | Title |
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US6815758B1 (en) * | 2003-08-22 | 2004-11-09 | Powerchip Semiconductor Corp. | Flash memory cell |
KR20050035678A (ko) * | 2003-10-14 | 2005-04-19 | 엘지전자 주식회사 | 광디스크 장치의 부가 데이터 재생방법 및 장치와, 이를위한 광디스크 |
KR100607785B1 (ko) * | 2004-12-31 | 2006-08-02 | 동부일렉트로닉스 주식회사 | 스플릿 게이트 플래시 이이피롬의 제조방법 |
KR100620223B1 (ko) * | 2004-12-31 | 2006-09-08 | 동부일렉트로닉스 주식회사 | 스플릿 게이트 플래쉬 이이피롬의 제조방법 |
KR100741923B1 (ko) * | 2005-10-12 | 2007-07-23 | 동부일렉트로닉스 주식회사 | 반도체 소자 및 그 제조방법 |
US7772060B2 (en) * | 2006-06-21 | 2010-08-10 | Texas Instruments Deutschland Gmbh | Integrated SiGe NMOS and PMOS transistors |
JP2008218899A (ja) * | 2007-03-07 | 2008-09-18 | Toshiba Corp | 半導体装置及びその製造方法 |
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KR100958798B1 (ko) * | 2008-04-04 | 2010-05-24 | 주식회사 하이닉스반도체 | 반도체 소자 제조 방법 |
KR100976064B1 (ko) * | 2008-07-23 | 2010-08-16 | 한양대학교 산학협력단 | 분리된 게이트를 가지는 2비트 멀티레벨 플래시 메모리 |
CN101986435B (zh) * | 2010-06-25 | 2012-12-19 | 中国科学院上海微系统与信息技术研究所 | 防止浮体及自加热效应的mos器件结构的制造方法 |
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DE102005061199B4 (de) | 2010-08-19 |
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US20090317953A1 (en) | 2009-12-24 |
CN100517760C (zh) | 2009-07-22 |
JP2006191004A (ja) | 2006-07-20 |
US20060145267A1 (en) | 2006-07-06 |
US20080042124A1 (en) | 2008-02-21 |
US7300846B2 (en) | 2007-11-27 |
KR100607785B1 (ko) | 2006-08-02 |
DE102005061199A1 (de) | 2006-07-13 |
CN1812130A (zh) | 2006-08-02 |
KR20060079013A (ko) | 2006-07-05 |
US7883966B2 (en) | 2011-02-08 |
US20090317952A1 (en) | 2009-12-24 |
US7923326B2 (en) | 2011-04-12 |
US7838934B2 (en) | 2010-11-23 |
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