JP6901153B2 - 薄膜形成用金属ハロゲン化合物の固体気化供給システム。 - Google Patents
薄膜形成用金属ハロゲン化合物の固体気化供給システム。 Download PDFInfo
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Description
前記蒸発原料用容器は、
容器壁を有する容器本体と、
前記容器本体に着脱自在に構成され、前記容器本体内にキャリアガスを導入するキャリアガス導入口及び蒸発した前記薄膜形成用金属ハロゲン化合物と前記キャリアガスとの混合ガスを外部に導出する混合ガス導出口を有する蓋体と、
前記容器本体と前記蓋体とを固定する締結部材と、
前記蓋体の前記キャリアガス導入口及び前記混合ガス導出口に配設された継手部材と、を備え、
前記容器本体の前記容器壁は、内壁部材及び外壁部材によって構成された二重壁構造を有し、前記キャリアガス導入口から導入された前記キャリアガスが、前記二重壁構造の前記内壁部材と前記外壁部材の間を経由して前記容器本体内に導入されるように構成され、且つ、
前記容器本体の前記容器壁が、純度99〜99.9999%の銅、純度99〜99.9999%のアルミニウム、又は純度99〜99.9999%のチタンから構成され、
前記容器本体、前記蓋体、前記締結部材、及び前記継手部材のそれぞれには、フッ素樹脂コーティングが施されている、及び/又は、それぞれの表面に電解研磨が施されている、固体気化供給システム。
前記バルブは、CV値(水置換)が0.2以上の真空バルブである、前記[1]に記載の固体気化供給システム。
一般式(1):MXn
(但し、前記一般式(1)において、Mは、Al、Hf、Zr、Ta、W、Ga、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Er、Tm及びYbのいずれかの元素を示す。Xは、ハロゲン元素を示す。nは、Xの価数である。)
本発明の薄膜形成用金属ハロゲン化合物の固体気化供給システムの一の実施形態は、図1に示すような固体気化供給システム500である。以下、本実施形態の薄膜形成用金属ハロゲン化合物の固体気化供給システムを、単に「固体気化供給システム」ということがある。図1は、本発明の薄膜形成用金属ハロゲン化合物の固体気化供給システムの一の実施形態の構成を示すブロック図である。
直径250〜350mmの電極を用い、電流密度を28.5mA/cm2以下、電解溶液の濃度を15〜30質量%、液流量を1〜8L/分、電解溶液のpHをアルカリ性とし、更に、研磨条件としては、圧力20〜60kPa、回転数350rpm以下とし、砥粒として砥粒径0.020〜0.10μmの無機粒子を用いる。
(但し、上記一般式(2)において、Mは、Al、Hf、Zr、Ta、W、Ga、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Er、Tm及びYbのいずれかの元素を示す。Xは、ハロゲン元素を示す。nは、Xの価数である。)
固体気化供給システム用の蒸発原料用容器は、例えば、以下のように製造することができる。まず、従来公知の方法で、ステンレス等によって、容器本体を構成する容器壁の外壁部材を作製する。その後、純度99〜99.9999%の銅、純度99〜99.9999%のアルミニウム、又は純度99〜99.9999%のチタンによって、容器本体を構成する容器壁の内壁部材を作製する。そして、外壁部材の内側に内壁部材を配置して、容器本体を作製する。また、容器本体に着脱自在に構成された蓋体を作製する。また、容器本体及び蓋体には、締結部材を配置するためのボルト挿入孔を形成し、このボルト挿入孔に適合した締結部材としてのボルト部材及びナット部材を用意する。また、蓋体のキャリアガス導入口及び混合ガス導出口に配置する各種の継手部材を用意する。このようにして、蒸発原料用容器を構成するための未処理の各部材を得る(準備工程)。
まず、図1に示すように、蒸発原料用容器100のキャリアガス導入口16(図2参照)を、キャリアガス供給手段107と連結させる。相互の連結はガス配管34によって行い、適宜、開閉バルブ、コントロールバルブ、流量計、及び圧力計などの計器を設けることが好ましい。また、蒸発原料用容器100の混合ガス導出口18(図2参照)を、バッファタンク101と連結させる。また、蒸発原料用容器100を、薄膜形成用金属ハロゲン化合物Aを蒸発原料用容器100に供給するための原料供給源102と連結させる。これらの連結もガス配管34によって行うことができる。
図2に示す蒸発原料用容器100のような、容器本体2と、蓋体4と、締結部材6と、継手部材8とを備えた蒸発原料用容器100を作製した。各実施例及び比較例において、蒸発原料用容器の容器本体の容器壁を、表1及び表2の「容器壁」の「材質」及び「純度(%)」に示すような材料によって作製した。また、容器本体、蓋体、締結部材、及び継手部材の表面を、下記の研摩条件(i)で研磨処理した。その後、研磨処理が施された各部材の表面上に、フッ素樹脂コーティングを施した。フッ素樹脂コーティングは、電子照射真空蒸着法による蒸着を行う装置を用いてポリテトラフルオロエチレン(テフロン)を蒸着させることによって行った。
実施例16〜30においては、フッ素樹脂コーティングを施さないこと以外は、実施例1〜15と同様の方法で蒸発原料用容器を作製した。即ち、実施例16〜30における蒸発原料用容器は、容器本体、蓋体、締結部材、及び継手部材の表面に、上記の研摩条件(i)による研磨処理のみが施されたものである。なお、各実施例16〜30においては、蒸発原料用容器の容器本体の容器壁を、表3の「容器壁」の「材質」及び「純度(%)」に示すような材料によって作製した。そして、上述した方法でバッファタンクを作製し、蒸発原料用容器とバッファタンクとをガス配管によって接続して固体気化供給システムを作製した。蒸発原料用容器とバッファタンクとを接続するガス配管の一部には、CV値(水置換)が1.5のバルブを配置し、このようなバルブを経由して混合ガスの供給を行った。
実施例31〜45においては、実施例1〜15と同様の方法で蒸発原料用容器を作製した。なお、実施例31では、実施例1と同様の蒸発原料用容器を作製し、以下、実施例32以降も、順次、実施例2以降に対応する蒸発原料用容器を作製した。また、上述した方法でバッファタンクを作製し、蒸発原料用容器とバッファタンクとをガス配管によって接続して固体気化供給システムを作製した。蒸発原料用容器とバッファタンクとを接続するガス配管の一部には、CV値(水置換)が1.5のバルブを配置し、このようなバルブを経由して混合ガスの供給を行った。バッファタンクの容量については、表7に示す通りである。そして、実施例1〜15と同様の方法で、原子層堆積(ALD)法による成膜を行った。実施例31〜45においては、蒸発原料用容器内には、球状部材などの充填物を充填せずに、混合ガスの生成を行った。
比較例17〜32においては、比較例1〜16と同様の方法で蒸発原料用容器を作製した。なお、比較例17では、比較例1と同様の蒸発原料用容器を作製し、以下、比較例18以降も、順次、比較例2以降に対応する蒸発原料用容器を作製した。比較例17〜32においては、バッファタンクを用いずに、蒸発原料用容器及びに接続されたガス配管を固体気化供給システムとし、蒸発原料用容器から混合ガスを直接供給することにより、原子層堆積(ALD)法による成膜を行った。
表4〜表8の結果から分かるように、実施例1〜45の固体気化供給システムは、比較例1〜32の固体気化供給システムに比べて、不純物の量が少ないことが分かる。また、実施例1〜45の固体気化供給システムの蒸発原料用容器は、「内部表面粗さ」の「A/B」の値が1に近い値となり、成膜前後における表面粗さの差が小さいことが分かる。ここで、この表面粗さの差が小さいということは、蒸発原料による腐食の程度が少なかったことを表しており、耐腐食性が高いことが分かる。このような結果から、実施例1〜45の固体気化供給システム(特に、蒸発原料用容器は)は、耐腐食性に優れたものであることが分かる。また、実施例1〜45の固体気化供給システムは、蒸発原料用容器の下流側にバッファタンクを備えているため、蒸発原料を含む混合ガスを、高流量且つ安定的に供給することができ、ALD膜の成長において、優れた成長速度を実現することが可能であった。
Claims (12)
- 蒸発原料としての薄膜形成用金属ハロゲン化合物を貯留し且つ蒸発させるための蒸発原料用容器と、前記蒸発原料用容器に接続されたバッファタンクと、を備えた薄膜形成用金属ハロゲン化合物の固体気化供給システムであって、
前記蒸発原料用容器は、
容器壁を有する容器本体と、
前記容器本体に着脱自在に構成され、前記容器本体内にキャリアガスを導入するキャリアガス導入口及び蒸発した前記薄膜形成用金属ハロゲン化合物と前記キャリアガスとの混合ガスを外部に導出する混合ガス導出口を有する蓋体と、
前記容器本体と前記蓋体とを固定する締結部材と、
前記蓋体の前記キャリアガス導入口及び前記混合ガス導出口に配設された継手部材と、を備え、
前記容器本体の前記容器壁は、内壁部材及び外壁部材によって構成された二重壁構造を有し、前記キャリアガス導入口から導入された前記キャリアガスが、前記二重壁構造の前記内壁部材と前記外壁部材の間を経由して前記容器本体内に導入されるように構成され、且つ、
前記容器本体の前記容器壁が、純度99〜99.9999%の銅、純度99〜99.9999%のアルミニウム、又は純度99〜99.9999%のチタンから構成され、
前記容器本体、前記蓋体、前記締結部材、及び前記継手部材のそれぞれには、フッ素樹脂コーティングが施されている、及び/又は、それぞれの表面に電解研磨が施されている、固体気化供給システム。 - 前記蒸発原料用容器と前記バッファタンクとを接続するガス流路の一部に配設されたバルブを更に備え、
前記バルブは、CV値(水置換)が0.2以上の真空バルブである、請求項1に記載の固体気化供給システム。 - 前記容器壁を構成する前記内壁部材の底面部に、前記内壁部材と前記外壁部材の間を経由した前記キャリアガスが前記容器本体に導入される容器内導入口を有する、請求項1又は2に記載の固体気化供給システム。
- 前記締結部材が、前記容器本体及び前記蓋体に設けられたボルト挿入孔に挿入されたボルト部材及び前記ボルト部材に螺合して締結したナット部材からなる、請求項1〜3のいずれか一項に記載の固体気化供給システム。
- 前記容器本体内に懸架された、少なくとも1つの板状の棚部材を更に有する、請求項1〜4のいずれか一項に記載の固体気化供給システム。
- 前記棚部材の少なくとも1つは、複数の貫通孔が形成されたシャワーヘッド構造を有する、請求項5に記載の固体気化供給システム。
- 前記棚部材の少なくとも1つは、多孔質体によって構成されている、請求項5に記載の固体気化供給システム。
- 前記容器本体内に、一の方向における最大長さが1〜30mmで、アルミニウム製又は銅製の、一以上の球状、長球状、葉状、螺旋状、又はその他不定形状の部材を更に有する、請求項1〜7のいずれか一項に記載の固体気化供給システム。
- 前記蒸発原料としての前記薄膜形成用金属ハロゲン化合物が、下記一般式(1)で表される化合物である、請求項1〜8のいずれか一項に記載の固体気化供給システム。
一般式(1):MXn
(但し、前記一般式(1)において、Mは、Al、Hf、Zr、Ta、W、Ga、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Er、Tm及びYbのいずれかの元素を示す。Xは、ハロゲン元素を示す。nは、Xの価数である。) - 化学気相成長法による成膜に用いられる、請求項1〜9のいずれか一項に記載の固体気化供給システム。
- 原子層堆積法による成膜に用いられる、請求項1〜10のいずれか一項に記載の固体気化供給システム。
- 前記蒸発原料用容器の前記容器本体内に前記キャリアガスを供給するキャリアガス供給手段を更に備える、請求項1〜11のいずれか一項に記載の固体気化供給システム。
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| JP2020128566A (ja) | 2020-08-27 |
| US11613809B2 (en) | 2023-03-28 |
| WO2020162500A1 (ja) | 2020-08-13 |
| CN113366142A (zh) | 2021-09-07 |
| KR20210118195A (ko) | 2021-09-29 |
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