JP5356005B2 - 不揮発性半導体記憶装置及びその製造方法 - Google Patents
不揮発性半導体記憶装置及びその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 50
- 238000004519 manufacturing process Methods 0.000 title claims description 42
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 161
- 239000010703 silicon Substances 0.000 claims abstract description 161
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 159
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 103
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 103
- 239000000758 substrate Substances 0.000 claims abstract description 31
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 83
- 239000013078 crystal Substances 0.000 claims description 82
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 15
- 239000011229 interlayer Substances 0.000 claims description 12
- 238000010030 laminating Methods 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 10
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 abstract description 10
- 238000007669 thermal treatment Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 53
- 229910021417 amorphous silicon Inorganic materials 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 238000007254 oxidation reaction Methods 0.000 description 14
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 12
- 230000003647 oxidation Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 5
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000000231 atomic layer deposition Methods 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-RNFDNDRNSA-N silicon-32 atom Chemical compound [32Si] XUIMIQQOPSSXEZ-RNFDNDRNSA-N 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Description
先ず、本発明の第1の実施形態について説明する。
図1(a)及び(b)乃至図6(a)及び(b)は、本実施形態に係る不揮発性半導体記憶装置の製造方法を例示する図であり、各図の(a)は工程断面図であり、各図の(b)は工程平面図である。
本実施形態においては、3次元積層型の不揮発性半導体記憶装置を効率よく製造するために、層間絶縁膜(シリコン酸化膜12)とゲート電極(シリコン膜13)を交互に堆積させて積層体14を形成した後、トレンチ15を形成し、トレンチ15の内面上に電荷ブロック膜(アルミナ膜16)、電荷蓄積膜(シリコン窒化膜17)、トンネル絶縁膜(シリコン酸化膜18)を成膜し、その上にチャネル膜(チャネルシリコン結晶膜20)を形成している。すなわち、図3(a)及び(b)に示す工程において、シリコン酸化膜18上に、CVD法により非晶質シリコン膜を堆積させている。このとき、シリコン酸化膜18と非晶質シリコン膜との界面には、CVDの原料ガス(例えばシラン)に起因する水酸基が残留したり、未結合手が発生したりして、欠陥が発生する。この欠陥は、非晶質シリコン膜が結晶化され、加工されてチャネルシリコン結晶膜20となったときに、シリコン酸化膜18とチャネルシリコン結晶膜20との界面に残留し、界面準位や固定電荷を発生させる。
図7(a)及び(b)乃至図8(a)及び(b)は、本実施形態に係る不揮発性半導体記憶装置の製造方法を例示する工程断面図であり、各図の(b)は、(a)に示す領域Rの一部拡大図である。
本実施形態においては、図7(a)及び(b)に示す工程において、一酸化窒素ガス雰囲気中で熱酸窒化処理を行っている。これにより、チャネルシリコン結晶膜20とシリコン酸化膜18との界面に、シリコン酸窒化物層24aが形成される。そして、シリコン酸窒化物層24aは、チャネルシリコン結晶膜20側に形成された窒素リッチ層24Nと、シリコン酸化膜18側に形成された酸素リッチ層24Oとの積層膜となる。
図9(a)及び(b)乃至図14(a)及び(b)は、本実施形態に係る不揮発性半導体記憶装置の製造方法を例示する図であり、各図の(a)は工程断面図であり、各図の(b)は工程平面図である。
本実施形態は、前述の第1の実施形態と比較して、トレンチの形状が溝形ではなく円柱形であること、及び、チャネルシリコン結晶層をシリコン基板に到達させることが異なっている。
次に、図10(a)及び(b)に示すように、レジストマスク(図示せず)を用いてRIEを行い、積層体14に複数本のトレンチ25を形成する。トレンチ25の形状は積層体14の積層方向に延びる円柱形とし、その内径は例えば70nmとする。また、積層体14の積層方向から見て、トレンチ25は例えばマトリクス状に配列させる。更に、各トレンチ25の底面にはシリコン基板11を露出させる。なお、図示の便宜上、各図には1本のトレンチ25のみを示しているが、実際には多数のトレンチ25を形成する。
本実施形態によれば、メモリセルトランジスタのチャネルがシリコン基板11に接続された3次元積層型の不揮発性半導体記憶装置を製造することができる。
また、本実施形態においては、前述の第1の実施形態と比較して、熱酸化処理条件が同じであれば、シリコン酸化物層31aの厚さに対するシリコン酸化物層31bの厚さの比を小さくすることができる。例えば、前述の第1の実施形態においては、この比は1.5〜3であるが、本実施形態においては、1〜2とすることができる。これは、チャネルシリコン結晶膜30の形状が円筒形であり、シリコン酸化膜18と接する外側面は凸型の曲面であり、熱酸化処理時に露出面である内側面は凹型の曲面であるため、酸化反応の進行に伴って発生する応力が、外側面よりも内側面の方が大きいためであると考えられる。これにより、シリコン酸化物層31bが厚くなることを抑制し、熱酸化処理後のチャネルシリコン結晶膜30の厚さを確保して、所望のチャネル電流を得ることが可能となる。また、所望の厚さのシリコン酸化物層31aを形成するための熱酸化処理温度を低くできるため、元素の熱拡散を抑制することができる。この結果、メモリアレイ部の構造を高精度化することができ、メモリ誤動作が少ない不揮発性半導体記憶装置を製造することができる。
図15(a)及び(b)並びに図16(a)及び(b)は、本実施形態に係る不揮発性半導体記憶装置の製造方法を例示する図であり、各図の(a)は工程断面図であり、各図の(b)は工程平面図であり、
図17は、本実施形態に係る不揮発性半導体記憶装置を例示する斜視図である。
なお、図17においては、図示の便宜上、シリコン基板11及びシリコン酸化膜12は図示を省略している。
本実施形態においては、前述の第3の実施形態と比較して、チャネルとなるシリコンピラーの断面積が大きくなるため、大きなセル電流を流すことができる。この結果、セルトランジスタの動作速度が大きく向上する。本実施形態における上記以外の作用効果は、前述の第3の実施形態と同様である。
図18は、本比較例に係る不揮発性半導体記憶装置を例示する断面図である。
図18に示すように、本比較例においても、前述の第4の実施形態と同様に、積層体14にトレンチ25を形成し、トレンチ25の内面上に、アルミナ膜16、シリコン窒化膜17及びシリコン酸化膜18をこの順に成膜する。次に、シリコン酸化膜18上にCVDにより非晶質シリコン膜を形成し、結晶化させて、円柱状のチャネルシリコン結晶膜40とする。但し、本比較例においては、非晶質シリコン膜の形成後、酸素ガス雰囲気中又は一酸化窒素ガス雰囲気中における熱処理は行わず、従って、シリコン酸化膜18とチャネルシリコン結晶膜40との界面に、シリコン酸化物層又はシリコン酸窒化物層が形成されない。
Claims (4)
- 基板上にそれぞれ複数の層間絶縁膜及びゲート電極を交互に積層して積層体を形成する工程と、
前記積層体にトレンチを形成する工程と、
前記トレンチの内面上に、電荷蓄積膜、トンネル絶縁膜及びシリコン結晶からなるチャネル膜をこの順に形成する工程と、
酸素ガス雰囲気中で熱処理を行い、前記トンネル絶縁膜と前記チャネル膜との界面にシリコン酸化物層を形成する工程と、
を備え、
前記熱処理を行うときに、前記トレンチ内に、前記トレンチの外部に通じ、内面に前記チャネル膜が露出した空洞が形成されていることを特徴とする不揮発性半導体記憶装置の製造方法。 - 基板上にそれぞれ複数の層間絶縁膜及びゲート電極を交互に積層して積層体を形成する工程と、
前記積層体にトレンチを形成する工程と、
前記トレンチの内面上に、電荷蓄積膜、トンネル絶縁膜及びシリコン結晶からなるチャネル膜をこの順に形成する工程と、
一酸化窒素ガス雰囲気中で熱処理を行い、前記トンネル絶縁膜と前記チャネル膜との界面にシリコン酸窒化物層を形成する工程と、
を備え、
前記熱処理を行うときに、前記トレンチ内に、前記トレンチの外部に通じ、内面に前記チャネル膜が露出した空洞が形成されていることを特徴とする不揮発性半導体記憶装置の製造方法。 - 前記熱処理の後、前記空洞の内面において前記チャネル膜を露出させる工程と、
前記空洞内にシリコンを埋め込む工程と、
をさらに備えたことを特徴とする請求項1または2に記載の不揮発性半導体記憶装置の製造方法。 - 基板と、
前記基板上に設けられ、それぞれ複数の層間絶縁膜及びゲート電極が交互に積層され、トレンチが形成された積層体と、
前記トレンチの内面上に設けられた電荷蓄積膜と、
前記電荷蓄積膜の内面上に設けられたトンネル絶縁膜と、
前記トンネル絶縁膜の内面上に設けられ、シリコン結晶からなるチャネル膜と、
前記チャネル膜の内面上に設けられた絶縁膜と、
を備え、
前記トンネル絶縁膜と前記チャネル膜との界面、及び前記チャネル膜と前記絶縁膜との界面に、シリコン酸化物層又はシリコン酸窒化物層が形成されていることを特徴とする不揮発性半導体記憶装置。
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US12/575,906 US7927953B2 (en) | 2008-12-10 | 2009-10-08 | Nonvolatile semiconductor memory device and method for manufacturing the same |
TW098139944A TWI413218B (zh) | 2008-12-10 | 2009-11-24 | 非揮發性半導體記憶體裝置及其製造方法 |
KR1020090121488A KR101117378B1 (ko) | 2008-12-10 | 2009-12-09 | 비휘발성 반도체 메모리 장치 및 그 제조 방법 |
US13/044,673 US8841183B2 (en) | 2008-12-10 | 2011-03-10 | Nonvolatile semiconductor memory device and method for manufacturing the same |
US14/461,013 US8946021B2 (en) | 2008-12-10 | 2014-08-15 | Nonvolatile semiconductor memory device and method for manufacturing the same |
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JP5142692B2 (ja) | 2007-12-11 | 2013-02-13 | 株式会社東芝 | 不揮発性半導体記憶装置 |
JP5230274B2 (ja) | 2008-06-02 | 2013-07-10 | 株式会社東芝 | 不揮発性半導体記憶装置 |
KR20100001260A (ko) * | 2008-06-26 | 2010-01-06 | 삼성전자주식회사 | 비휘발성 메모리 소자 및 그 제조 방법 |
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TWI413218B (zh) | 2013-10-21 |
US9219076B2 (en) | 2015-12-22 |
US8841183B2 (en) | 2014-09-23 |
US20140357032A1 (en) | 2014-12-04 |
US20110156131A1 (en) | 2011-06-30 |
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US8946021B2 (en) | 2015-02-03 |
JP2010140997A (ja) | 2010-06-24 |
US7927953B2 (en) | 2011-04-19 |
US20150137212A1 (en) | 2015-05-21 |
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US20100140684A1 (en) | 2010-06-10 |
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