JP4975414B2 - Cvd又はaldによる膜の堆積のための方法 - Google Patents
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- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
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- H10P14/6339—Deposition from the gas or vapour phase using decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE or pulsed CVD
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- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45534—Use of auxiliary reactants other than used for contributing to the composition of the main film, e.g. catalysts, activators or scavengers
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
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- H10P14/69392—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses the material containing at least one metal element, e.g. metal oxides, metal oxynitrides or metal oxycarbides characterised by the metal the material containing hafnium, e.g. HfO2
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- H10D64/01—Manufacture or treatment
- H10D64/013—Manufacture or treatment of electrodes having a conductor capacitively coupled to a semiconductor by an insulator
- H10D64/01302—Manufacture or treatment of electrodes having a conductor capacitively coupled to a semiconductor by an insulator the insulator being formed after the semiconductor body, the semiconductor being silicon
- H10D64/01332—Making the insulator
- H10D64/01336—Making the insulator on single crystalline silicon, e.g. chemical oxidation using a liquid
- H10D64/01342—Making the insulator on single crystalline silicon, e.g. chemical oxidation using a liquid by deposition, e.g. evaporation, ALD or laser deposition
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Description
本願は、2005年11月16日に出願された米国仮出願第60/737,732(これは、ここにおいて参考として援用される)の優先権を主張する。
本発明は、化学気相成長(CVD)及び原子層堆積(ALD)による膜堆積プロセスの分野に関する。
ALD及びCVD堆積プロセスにおいて、しばしば非常に低い蒸気圧を有する反応物が使用される。最初に、これは、反応物をリアクタに輸送することが困難になるため、問題である。さらに、反応物曝露工程の後、排気のパージングによって反応チャンバから反応物を除去することが困難になる。
反応物分子が他の重分子(heavy molecule)に対して配位結合を形成し、結果として低揮発性を生じることを防ぐために、配位圏も中性リガンドによって飽和され得る。中性リガンドは、一般的に、他の分子の中心原子又はイオン、通常は金属、に配位結合を介して結合することができる分子である。配位結合は、リガンドと他の分子間の相互作用の際に形成され、ここでリガンドは、形成される錯体において共有される電子対の供与体として働き、他の分子は受容体として働く。中性リガンドは、前駆体をより揮発性にするために、幾つかの化合物の合成において使用されてきた。1つのよく知られた例は、Cu(HFAC)TMVS(Air Productsによって商標CupraselectTMとして市場に出された)である。中性配位リガンドの問題は、中心原子への結合強度が、通常共有又はイオン結合で結合されるリガンドよりも非常に弱く、従って分子の熱安定性が制限されることである。これは、中性配位リガンドを有する化合物の寿命は、比較的短くあり得ることを意味する。ソースコンテナの温度は、殆どの場合、室温以上であるため、寿命はプロセシング環境において更に短縮され得る。従って、生産環境において、中性配位リガンドを有する合成された化合物は、しばしば使用され得ない。
一実施形態において、前駆体及び中性配位リガンドは、1つ以上の基板を収容する反応スペースの近く又は中で一時的に“混合”される。好ましくは、混合の場所は、反応スペースから5m未満、より好ましくは2m未満である。好ましくは、混合は、混合物が反応スペースに導入される前、60秒未満、より好ましくは10秒未満で起こる。この意味における“混合”とは、ガス相混合又は前駆体パルスの後に同一の反応スペースに供給されること(この場合“混合”は、しばしば反応スペースの表面に吸着した種とである)を含むと理解される。
− 直鎖又は分枝を有するC1〜C20アルキル、アルケニル、又はアルキニル基又は水素;
− ハロゲン化されたアルキル、アルケニル、又はアルキニル基(ここで、少なくとも1つの水素原子は、フッ素、塩素、臭素又はヨウ素原子で置換される);
− (水素原子が)二重結合のO、S、若しくはN、又は三重結合のNで置換されたアルキル、アルケニル、又はアルキニル基
− (1つの水素原子が)−NH2、−SH2、−OHの群から成る群から選択される置換基で置換されたアルキル、アルケニル又はアルキニル;及び
Xは、O、S、N及びPから成る群から独立して選択される任意のヘテロ原子であり得る)。
R1及びR2は、以下から独立して選択され得、
− 直鎖又は分枝を有するC1〜C20アルキル、アルケニル、又はアルキニル基又は水素;
− ハロゲン化されたアルキル、アルケニル、又はアルキニル基(ここで、少なくとも1つの水素原子は、フッ素、塩素、臭素又はヨウ素原子で置換される);
− 置換二重結合性O、S、若しくはN、又は三重結合性Nで置換されたアルキル、アルケニル又はアルキニル基
− (例えば、1つの水素原子が)−NH2、−SH2、−OHの群から成る選択される置換基で置換されたアルキル、アルケニル又はアルキニル基;及び
Xは、O、S、N及びPから成る群から独立して選択される任意のヘテロ原子であり得る)。
HCl(g) + NH3(g) → HCl:NH3(s)
この場合は、形成されるHClがピリジンによって配位される様に、ピリジンをNH3と同時に供給することが提案される:
HCl(g) + NC5H5(g) → HCl:NC5H5(g)
ピリジン塩酸塩の蒸気圧は、220℃において750 Torrであり、一方塩化アンモニウムの蒸気圧は、160℃において1 Torrである。
Claims (28)
- 2つ以上の反応物が反応チャンバに供給され、該反応物のうちの1つが金属ハライドからなる気相堆積プロセスによって該反応チャンバ中の基板上の膜の堆積を改良するための方法であって、以下:
揮発性中性配位リガンドを反応物の供給源とは別個の供給源から該反応チャンバに供給すること;
該揮発性中性配位リガンドを該金属ハライドと接触させること(ここで、該揮発性中性配位リガンドは、該金属ハライドに配位することが出来、該気相堆積プロセスが原子層堆積法である);
を含む方法。 - 該基板の複数エリア間における膜厚のバリエーションによって特定される、堆積した該膜の均一性が3%以下である、請求項1に記載の方法。
- 該揮発性中性配位リガンドが、フラン、テトラヒドロフラン、ジオキサン、チオフェン、テトラヒドロチオフェン及びこれらの誘導体から成る群から選択される、請求項1に記載の方法。
- 該揮発性中性配位リガンドがカルボン酸、アルケン、及びアルキンから成る群から選択される、請求項1に記載の方法。
- 原子層堆積(ALD)によって反応チャンバ中の基板上に膜を堆積するための方法であって、以下:
複数の堆積サイクル(各堆積サイクルは、第一反応物及び第二反応物の別個の気相のパルスを該反応チャンバに連続的且つ交互の様式で供給すること(該第一反応物及び該第二反応物は相互に反応性であり、該第一反応物及び該第二反応物の一方はハライドからなる)を含む);及び
該第一反応物及び該第二反応物の1以上の別個のパルスを供給するプロセスの間に、反応物の供給源とは別個の供給源から該反応チャンバに気相の中性配位リガンドを供給すること(ここで該中性配位リガンドは、該反応物の1つ若しくは両方又は該第一反応物及び該第二反応物の間の反応によって形成される反応副生成物に配位することができ、該中性配位リガンドは、すべての堆積サイクルにおいて供給されるとは限らない)
を含む方法。 - 該中性配位リガンドが毎2〜100堆積サイクルで供給される、請求項5に記載の方法。
- 該中性配位リガンドが1つおきの堆積サイクルで供給される、請求項6に記載の方法。
- 該中性配位リガンドが、少なくとも1つの二重又は三重炭素−炭素結合を有する炭素鎖を含む、請求項5に記載の方法。
- 該中性配位リガンドが、ヘテロ原子を更に含み、該ヘテロ原子及び該炭素鎖が一緒になって環状構造を形成する、請求項8に記載の方法。
- 該環状構造が、5又は6個の原子を含む、請求項9に記載の方法。
- 該へテロ原子が、非共有電子対を含む、請求項9に記載の方法。
- 該へテロ原子が、O、S、P及びNから成る群から選択される、請求項9に記載の方法。
- 該中性配位リガンドが、フラン(C4H4O)、テトラヒドロフラン(C 4 H 8 O)、チオフェン(C4H4S)、C 4H4 P、テトラヒドロチオフェン(C4H8S)及びピリジン(C5H5N)から成る群から選択される、請求項12に記載の方法。
- 該炭素鎖が、炭素−炭素二重結合を含むアルケンである、請求項8に記載の方法。
- 該アルケンが、エテン(C2H4)、プロペン(C3H6)、ブテン(C4H8)及びブタジエン(C4H6)から成る群から選択される、請求項14に記載に記載の方法。
- 該炭素鎖が、三重炭素−炭素結合を含むアルキンである、請求項8に記載の方法。
- 該アルキンが、アセチレン(C2H2),プロピン(C3H4)及びブチン(C4 H 6)から成る群から選択される、請求項16に記載の方法。
- 該中性配位リガンドを供給することが、該第一反応物のパルス中及び該第二反応物のパルス中に実施される、請求項5に記載の方法。
- 該中性配位リガンドを供給することが、反応物パルスの間に実施される、請求項5に記載の方法。
- 各堆積サイクルが、該第一反応物及び該第二反応物の該パルスと別個のパルスにおいて少なくとも第三反応物を供給することを更に含む、請求項5に記載の方法。
- 膜の気相堆積のための方法であって、以下:
反応スペースに気相の金属ハライド前駆体を供給すること(ここで、該金属ハライド前駆体は、堆積される該膜中に組み込まれる少なくとも1つの金属を供給する);
該金属ハライド前駆体の揮発性を増大させる中性配位リガンドを、少なくとも1の該金属ハライド前駆体の供給源とは別個の供給源から該反応スペースに供給し、該中性配位リガンドが該金属ハライド前駆体と反応せず、該気相堆積が原子層堆積法からなること;
を含む方法。 - 該中性配位リガンドを供給することが、堆積中に該反応スペースの上流で該中性配位リガンドと該金属ハライド前駆体を混合することを含む、請求項21に記載の方法。
- 該中性配位リガンドを供給することが、該金属ハライド前駆体の該反応スペースをパージすることを促進するために、該金属ハライド前駆体をパルスした後に該中性配位リガンドをパルスすることを含む、請求項21に記載の方法。
- 該反応チャンバに供給された該揮発性中性配位リガンドが、少なくとも1つの該反応物と、該反応チャンバ内又は該反応チャンバの近傍で混合される、請求項1に記載の方法。
- 該揮発性中性配位リガンドが炭素鎖とヘテロ原子を含み、該炭素鎖と該ヘテロ原子が一緒になって環状構造を形成する、請求項1に記載の方法。
- 該中性配位リガンドが炭素鎖とヘテロ原子を含み、該炭素鎖と該ヘテロ原子が一緒になって環状構造を形成する、請求項21に記載の方法。
- 該気相堆積プロセスは該基板を堆積温度にして行い、該揮発性中性配位リガンドが該堆積温度において不反応性である、請求項1に記載の方法。
- 該揮発性中性配位リガンドを提供することが、該揮発性中性配位リガンドを提供しない膜に比べて、該基板上の膜厚の最小値における差をもたらさない、請求項1に記載の方法。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US73773205P | 2005-11-16 | 2005-11-16 | |
| US60/737,732 | 2005-11-16 |
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| Publication Number | Publication Date |
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| JP2007142415A JP2007142415A (ja) | 2007-06-07 |
| JP4975414B2 true JP4975414B2 (ja) | 2012-07-11 |
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| JP2007142415A (ja) | 2007-06-07 |
| US8048484B2 (en) | 2011-11-01 |
| KR101370460B1 (ko) | 2014-03-06 |
| KR20070052226A (ko) | 2007-05-21 |
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