JP2004134796A - 非揮発性sonsnosメモリ - Google Patents
非揮発性sonsnosメモリ Download PDFInfo
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- 230000015654 memory Effects 0.000 title claims abstract description 97
- 239000004065 semiconductor Substances 0.000 claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 44
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 32
- 239000002096 quantum dot Substances 0.000 claims abstract description 25
- 239000010703 silicon Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 23
- 150000004767 nitrides Chemical class 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910052737 gold Inorganic materials 0.000 claims description 6
- 238000004518 low pressure chemical vapour deposition Methods 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000004544 sputter deposition Methods 0.000 claims description 5
- 229910004158 TaO Inorganic materials 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 4
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 230000008859 change Effects 0.000 description 12
- 150000003376 silicon Chemical class 0.000 description 10
- 150000002500 ions Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- -1 Silicon Oxide Nitride Chemical class 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010893 electron trap Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Abstract
【解決手段】基板のチャンネル上に積層される第1及び第2絶縁膜と、第1絶縁膜の上部と第2絶縁膜の下部に形成される第1及び第2誘電膜、並びに第1及び第2誘電膜間に介設されるIV族半導体膜、シリコン量子ドット、または金属量子ドットを含む非揮発性SONSNOSメモリ。
【選択図】 図3
Description
図2を参照すれば、ソース電極33とドレーン電極35とが形成された基板31の上部にゲート電極37が位置し、基板31とゲート電極37の間に絶縁膜として酸化シリコン(silicon oxide)膜41,45が形成され、酸化シリコン膜41,45の間に電子をトラップする非伝導性誘電膜43が介設される。
Chan et al,IEEE Electron Device Letters,Vol.8,No.3,PP93,1987
前記第1誘電膜及び第2誘電膜はSi3N4およびPZTのうちの少なくとも一つで形成されることが望ましい。
前記金属はAuおよびAlのうちの少なくとも一つであることが望ましい。
前記第1誘電膜及び第2誘電膜はSi3N4およびPZTのうちの少なくとも一つから形成されることが望ましい。
前記IV族半導体物質はSiおよびGeのうちの少なくとも一つであることが望ましい。
前記金属はAuおよびAlのうちの少なくとも一つであることが望ましい。
本発明はSONOSメモリの一般的な構造にシリコン膜を挿入して新しい構造のメモリを製造することにより電子のトラップサイトを増加させて高速及び大容量の新しいメモリを具現できる。
図3を参照すれば、本発明の第1実施形態によるSONSNOSメモリでは、ソース電極103及びドレーン電極105が形成されている基板101の上部にゲート電極107が配置され、基板101とゲート電極107間に電子をトラップするための多層のONSNO(Oxide Nitride Silicon Nitride Oxide)膜が介設される。ソース103とドレーン電極105の間には電子のチャンネルが形成され、ゲート電極107はSiなどの半導体または金属を使用して形成できる。
参照符号121は基板、123はソース電極、125はドレーン電極、127はゲート電極、131aは第1オキシド膜、131bは第2オキシド膜、133aは第1ナイトライド膜、133bは第2ナイトライド膜、135はシリコン量子ドットを示す。本発明の第2実施形態によるSONSNOSメモリは本発明の第1実施形態によるSONSNOSメモリと類似した構造を有するが、シリコン膜115の代わりにシリコン量子ドット135を備える点が相違する。ここで、シリコン量子ドット135の代わりにAuまたはAlからなる金属量子ドットであってもよい。
シリコン量子ドット135は金属量子ドットに替えることができ、シリコン量子ドット135または金属量子ドットは物理的または化学的方法で製造できる。
図5を参照すれば、基板201とゲート電極207間にONSNSNO膜が介設されている。基板201上には、ソース及びドレーン電極203,205が形成されている。ONSNSNO膜は、基板201の上面とゲート電極207の底面とにそれぞれ配置された第1オキシド膜211aと第2オキシド膜211b、第1オキシド膜211aの上面と第2オキシド膜211bの底面とにそれぞれ配列された第1ナイトライド膜213aと第2ナイトライド膜213b、第1ナイトライド膜213aの上面と第2ナイトライド膜213bの底面とにそれぞれ形成された第1シリコン膜215aと第2シリコン膜215b及び第1シリコン膜215aと第2シリコン膜215bの間に介設された第3ナイトライド膜213cを備える。
図6を参照すれば、本発明の第4実施形態による多層SONSNOSメモリは、本発明の第3実施形態によるマルチSONSNOSメモリと類似した構造を有し、ただし第1及び第2シリコン膜215a,215bの代わりに第1及び第2シリコン量子ドット235a,235bを備えることが相違する。ここで、第1及び第2シリコン量子ドット235a,235bの代わりに第1及び第2金属量子ドットを形成できる。金属量子ドットはAuまたはAlからなる。
例えば、本発明が属する技術分野で当業者ならば、本発明の技術的思想によりナノ量子ドットを形成するナノ粒子をあらかじめ多様な方法で製造して単電子トランジスタに利用できる。ゆえに、本発明の範囲は説明された実施形態により定められるのではなくして特許請求範囲に記載された技術的思想により定められるのである。
103 ソース電極
105 ドレイン電極
107 ゲート電極
111a 第1オキサイド膜
111b 第2オキサイド膜
113a 第1ナイトライド膜
113b 第2ナイトライド膜
115 シリコン膜
Claims (18)
- 所定間隔離隔されたソース及びドレーン電極並びに前記ソース及びドレーン電極間に電子が移動するチャンネルを含む半導体基板と、前記半導体基板の上部に前記チャンネルからの電子の流入を制御するゲート電極とを備えるメモリにおいて、
前記半導体基板のチャンネル上に積層される第1絶縁膜及び第2絶縁膜と、
前記第1絶縁膜の上部と第2絶縁膜の下部に形成される第1誘電膜及び第2誘電膜と、
前記第1誘電膜と第2誘電膜の間に介設されるIV族半導体膜とを含むことを特徴とするシリコン・オキシド・ナイトライド・シリコン・ナイトライド・オキシド・シリコン(SONSNOS)メモリ。 - 所定間隔離隔されたソース及びドレーン電極並びに前記ソース及びドレーン電極間に電子が移動するチャンネルとを含む半導体基板と、前記半導体基板の上部に前記チャンネルからの電子の流入を制御するゲート電極とを備えるメモリにおいて、
前記半導体基板のチャンネル上に積層される第1絶縁膜及び第2絶縁膜と、
前記第1絶縁膜の上部と第2絶縁膜の下部に形成される第1誘電膜及び第2誘電膜と、
前記第1誘電膜と第2誘電膜の間に介設されるIV族半導体物質または金属から形成されたナノ量子ドットとを含むことを特徴とするSONSNOSメモリ。 - 所定間隔離隔されたソース及びドレーン電極並びに前記ソース及びドレーン電極間に電子が移動するチャンネルを含む半導体基板と、前記半導体基板の上部に前記チャンネルからの電子の流入を制御するゲート電極とを備えるメモリにおいて、
前記半導体基板のチャンネル上に積層される第1絶縁膜及び第2絶縁膜と、
前記第1絶縁膜の上部と第2絶縁膜の下部に形成される第1誘電膜及び第2誘電膜と、
前記第1誘電膜と第2誘電膜の間に介設される金属から形成されたナノ量子ドットとを含むことを特徴とするSONSNOSメモリ。 - 前記第1絶縁膜及び第2絶縁膜は、それぞれSiO2、Al2O3、TaO2及びTiO2で構成されるグループから選択されるいずれか一つの物質から形成されることを特徴とする請求項1ないし請求項3のいずれか1項に記載のSONSNOSメモリ。
- 前記第1誘電膜及び第2誘電膜は、それぞれSi3N4およびPZTのうちの少なくとも一つで形成されることを特徴とする請求項1ないし請求項3のいずれか1項に記載のSONSNOSメモリ。
- 前記IV族半導体膜は、SiおよびGeのうちの少なくとも一つで形成されることを特徴とする請求項1に記載のSONSNOSメモリ。
- 前記IV族半導体物質は、SiおよびGeのうちの少なくとも一つであることを特徴とする請求項2に記載のSONSNOSメモリ。
- 前記金属はAuおよびAlのうちの少なくとも一つであることを特徴とする請求項3に記載のSONSNOSメモリ。
- 前記ナノ量子ドットは、LPCVD法またはスパッタリング法を利用して形成することを特徴とする請求項2または3に記載のSONSNOSメモリ。
- 所定間隔離隔されたソース及びドレーン電極並びに前記ソース及びドレーン電極間に電子が移動するチャンネルを含む半導体基板と、前記半導体基板の上部に前記チャンネルからの電子の流入を制御するゲート電極とを備えるメモリにおいて、
前記半導体基板のチャンネル上に積層される第1絶縁膜及び第2絶縁膜と、
前記第1絶縁膜の上部と第2絶縁膜の下部とに形成される複数の誘電膜と、
前記複数の誘電膜の間ごとに介設される複数のIV族半導体膜とを含むことを特徴とする多層SONSNOSメモリ。 - 所定間隔離隔されたソース及びドレーン電極並びに前記ソース及びドレーン電極間に電子が移動するチャンネルを含む半導体基板と、前記半導体基板の上部に前記チャンネルからの電子の流入を制御するゲート電極とを備えるメモリにおいて、
前記半導体基板のチャンネル上に積層される第1絶縁膜及び第2絶縁膜と、
前記第1絶縁膜の上部と第2絶縁膜の下部とに形成される複数の誘電膜と、
前記複数の誘電膜の間ごとに介設されるIV族半導体物質から形成されたナノ量子ドットとを含むことを特徴とする多層SONSNOSメモリ。 - 所定間隔離隔されたソース及びドレーン電極並びに前記ソース及びドレーン電極間に電子が移動するチャンネルを含む半導体基板と、前記半導体基板の上部に前記チャンネルからの電子の流入を制御するゲート電極とを備えるメモリにおいて、
前記半導体基板のチャンネル上に積層される第1絶縁膜及び第2絶縁膜と、
前記第1絶縁膜の上部と第2絶縁膜の下部とに形成される複数の誘電膜と、
前記複数の誘電膜の間ごとに介設される金属から形成されたナノ量子ドットとを含むことを特徴とするマルチSONSNOSメモリ。 - 前記第1及び第2絶縁膜は、それぞれSiO2、Al2O3、TaO2及びTiO2から構成されるグループから選択された少なくとも一つの物質から形成されることを特徴とする請求項10ないし請求項12のいずれか1項に記載の多層SONSNOSメモリ。
- 前記第1及び第2誘電膜は、それぞれSi3N4およびPZTのうちの少なくとも一つから形成されることを特徴とする請求項10ないし請求項12のいずれか1項に記載の多層SONSNOSメモリ。
- 前記IV族半導体膜は、SiおよびGeのうちの少なくとも一つから形成されることを特徴とする請求項10に記載の多層SONSNOSメモリ。
- 前記IV族半導体物質は、SiおよびGeのうちの少なくとも一つであることを特徴とする請求項11に記載の多層SONSNOSメモリ。
- 前記金属は、AuおよびAlのうちの少なくとも一つであることを特徴とする請求項11に記載の多層SONSNOSメモリ。
- 前記ナノ量子ドットは、LPCVD法またはスパッタリング法を利用して形成されることを特徴とする請求項11または12に記載の多層SONSNOSメモリ。
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KR100446632B1 (ko) | 2004-09-04 |
EP1411555B1 (en) | 2006-11-22 |
EP1411555A2 (en) | 2004-04-21 |
EP1411555A3 (en) | 2005-02-02 |
US6936884B2 (en) | 2005-08-30 |
CN1326244C (zh) | 2007-07-11 |
US20040079983A1 (en) | 2004-04-29 |
JP5038580B2 (ja) | 2012-10-03 |
DE60309806D1 (de) | 2007-01-04 |
KR20040033406A (ko) | 2004-04-28 |
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