JP2006503440A - キャパシタを含んだ集積回路構造およびその製造方法 - Google Patents
キャパシタを含んだ集積回路構造およびその製造方法 Download PDFInfo
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- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 239000012777 electrically insulating material Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 4
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- 230000007261 regionalization Effects 0.000 claims description 2
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- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims 1
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Abstract
Description
・寄生容量と有効容量の抵抗との比が小さい。また、微分容量が異なるのは、空間電荷領域に起因している。
アナログ容量の場合、微分容量は、動作基点において有効な容量である。漏れ電流が少ない。容量の微分非線形性が小さい。容量は、広い動作点の範囲において一定である。得られた容量/面積比が大きい。例えば1立方マイクロメートルあたり10フェムトファラッドよりも大きいか、または、1立方マイクロメートルあたり20フェムトファラッドよりも大きい。
A=L・B+H・(2・L+B)
である。ここで、Aは有効面積であり、Bはキャパシタの幅であり、Lはキャパシタの長さであり、Hは、図16Aに示したように、下部電極領域34の高さである。
COX=εr ε0/tphys=110fF/μm2
であり、tphysは、模範的な実施形態では酸化物の厚さ(2ナノメートル)である。これにより、
AMEM=CMEM/COX−0.18μm2
の蓄積容量の所要面積AMEMが得られる。
COX=3.9ε0/tfox=19fF/μm2、
から分かる。ここで、tfoxは、1.8ナノメートルであり、電気的に有効な酸化物の層厚を示している。ε0は、真空状態(Vakuum)での誘電率を示している。金属ゲートを用いた場合、面積に対する容量が
COX=3.9ε0/tfox=24fF/μm2、
に増加した結果、ゲートが空乏化するので、電気的に有効な酸化物の層厚は約0.4ナノメートルに減少する。
ここで、CsはキャパシタCsの容量であり、CGSはトランジスタM2のゲートソース容量である。ゲート酸化物およびキャパシタ誘電体が同じ誘電体層の中に形成されており、この層がどの点をとっても同じ厚さである場合、蓄積キャパシタCsと例えばトランジスタM2との面積あたりの容量は、上記製造方法によれば同じ大きさとなる。
他の模範的な実施形態では、FinFETトランジスタの代わりに、複数のFinFET(Multi-FinFET)トランジスタを使用する。このトランジスタは、単一の金属板の代わりに、ドレイン端子領域とソース端子領域との間に互いに平行に配置された多数の金属板を含んでいる。
Claims (18)
- 電気的に絶縁性の絶縁領域と、キャパシタ(124)を形成する少なくとも1つの一連の領域と、を含み、
上記キャパシタが、
絶縁領域近傍の電極領域(34)と、
誘電体領域(46)と、
上記絶縁領域から離れた電極領域(56)と、をこの順に備えている、集積回路構造(120)であって、
上記絶縁領域が、平面に配置された絶縁層(14)の一部であり、
上記集積回路構造(120)の、キャパシタ(124)と少なくとも1つの活性素子(122)とが、絶縁層(14)に対して同じ側に位置しており、
上記絶縁領域近傍の電極領域(34)と上記活性素子(122)の活性領域(82)とが、絶縁層(14)が配置された平面と平行な平面に配置されていることを特徴とする、集積回路構造(120)。 - 上記絶縁領域近傍の電極領域(34)が、単結晶領域、好ましくはドープされた半導体領域であり、および/または、
上記絶縁領域近傍の電極領域(34)および/または活性領域(82)の厚さが、100nm、または、50nmよりも薄く、および/または、
上記活性領域(82)が、単結晶領域、好ましくは、ドープされているかドープされていない半導体領域であり、および/または、
上記絶縁層(14)の一方の界面(an einer Seite)には、キャリア基板(12)、好ましくは、半導体材料(特にシリコンまたは単結晶シリコン)を含んでいるか上記半導体材料からなるキャリア基板が隣接しており、および/または、
上記絶縁層(14)の他方の界面には、絶縁領域近傍の電極領域(34)が隣接しており、および/または、
上記界面が、完全に互いに平行な2つの平面であることが好ましく、および/または、
上記絶縁層(14)が、電気的に絶縁性の材料(好ましくは酸化物、特に好ましくは二酸化シリコン)を含んでいるか、または、この電気的に絶縁性の材料からなり、および/または、
上記活性素子(122)が、トランジスタ、好ましくは電界効果トランジスタ、特に好ましくはFinFETであることを特徴とする、請求項1に記載の回路構造(120)。 - 上記誘電体領域(46)が、二酸化シリコンを含んでいるか、または、二酸化シリコンからなり、および/または、
上記誘電体領域(46)の誘電率が4、10、または、50よりも大きい材料からなり、および/または、
上記電極領域(56)が、
シリコン(好ましくは多結晶シリコン)を含んだ絶縁領域、または、シリコン(好ましくは多結晶シリコン)からなる絶縁領域から離れており、および/または、金属を含んでいるか、または、金属からなる絶縁領域から離れており、低インピーダンスの材料(好ましくは窒化チタン、窒化タンタル、ルビジウム、または、高ドープされたシリコンゲルマニウム)を含んだ絶縁領域から離れており、および/または、金属半導体化合物を含んだ領域(特に、ケイ化物領域(96))に隣接した絶縁領域から離れていることを特徴とする、請求項1または2に記載の回路構造(120)。 - 上記誘電体領域(46)と絶縁領域から離れた電極領域(56)とが、絶縁領域近傍の電極領域(34)の、2、3、4、または、5つの側面に、または、5つよりも多い側面に、配置されており、および/または、
上記絶縁領域近傍の電極領域(34)が、多数の金属板を含んでおり、この金属板の高さが、好ましくは金属板の幅よりも大きい、または、金属板の幅の少なくとも2倍であることを特徴とする、請求項1〜3のいずれか1項に記載の回路構造(120)。 - 少なくとも1つの電界効果トランジスタ(122)のチャネル領域(82)が、好ましくはドープされていない、活性領域であり、および/または、
上記電界効果トランジスタ(122)の制御電極(54)が、絶縁領域から離れた電極領域(56)と同じ材料、および/または、この電極領域(56)と同じドーパント濃度の材料を含んでおり、および/または、
上記電界効果トランジスタ(122)の制御電極絶縁領域(42、44)が、誘電体領域(46)の材料と同じ材料を含んでおり、および/または、この制御電極絶縁領域(42、44)の材料が、誘電体領域(46)の材料と同じ厚さであり、および/または、
上記電界効果トランジスタ(122)の制御電極絶縁領域(42、44)が、上記誘電体領域(46)とは異なる材料を含んでおり、および/または、前記誘電体領域(46)とは異なる厚さの材料を含んでいることを特徴とする、請求項1〜4のいずれか1項に記載の回路構造(120)。 - 上記電界効果トランジスタ(122)は、少なくとも1つの金属板を含んでおり、および/または、
複数の制御電極(54)(好ましくは2つか3つの制御電極)が、金属板(30a)の互いに対向した両側に配置されており、および/または、
少なくとも1つの制御電極(54)が、金属半導体化合物を含んだ領域(特にケイ化物領域(92))に隣接しており、および/または、
好ましくは、制御電極絶縁領域(42、44)の厚さよりも厚い絶縁領域(18、20)によってチャネル領域から絶縁されている接続領域が、制御電極(54)に電気的に接続しており、および/または、
上記接続領域が、絶縁領域から離れた電極領域(56)と同じ材料を有しており、および/または、前記電極領域(56)と同じドーピングレベルであることを特徴とする、請求項5に記載の回路構造(120)。 - 上記電界効果トランジスタ(122)の、1つの端子領域または両方の端子領域(70、72)が、絶縁層(14)に隣接しており、および/または、
少なくとも1つの端子領域(70、72)が、金属半導体化合物を含んだ領域(好ましくはケイ化物領域(90、94))に隣接しており、および/または、
上記端子領域(70、72)の厚さが、活性領域(82)の厚さよりも厚いことを特徴とする、請求項5または6に記載の回路構造(20)。 - スペーサー(60b、60c)が、制御電極(54)の両側に配置されており、電極層とは異なる材料(好ましくは窒化シリコン)を含んでいることが好ましく、または、電極層とは異なる材料(好ましくは窒化シリコン)からなることが好ましく、および/または、
スペーサー(60d)が、絶縁領域から離れた電極領域(56)の少なくとも1側面に配置されており、電極層(50)とは異なる材料(好ましくは窒化シリコン)を含んでいるか、または、前記異なる材料(好ましくは窒化シリコン)からなり、および/または、
制御電極(54)に配置されたスペーサー(60c)と、絶縁領域から離れた電極領域(56)に配置されたスペーサー(60d)とが、互いに接触していることを特徴とする、請求項5〜7のいずれか1項に記載の回路構造(20)。 - 上記絶縁領域近傍に位置する、電界効果トランジスタ(122)の端子領域(72)と、キャパシタ(124)の電極領域(34)とが、互いに隣接しており、電気的に界面で導電接続されており、および/または、
上記電極領域(34)に隣接している端子領域(72)が、金属半導体化合物を含んだ領域に隣接しておらず、および/または、
上記他の端子領域(70)が、金属半導体化合物を含んだ領域に隣接していることを特徴とする、請求項5〜8のいずれか1項に記載の回路構造(120)。 - 上記端子領域(72)に隣接している絶縁領域近傍の電極領域(34)の1側面が、上記側面に対して垂直な絶縁領域近傍の電極領域(34)のもう一方の側面よりも長い(少なくとも2倍、または、5倍である)ことが好ましく、
上記トランジスタ(122)の幅が、最小面積(F)の倍数であり、好ましくは3倍または5倍よりも大きく、または、
上記端子領域(72)に隣接している絶縁領域近傍の電極領域(34)の1側面に対して平行な絶縁領域近傍の電極領域(34)のもう一方の1側面は、端子領域(72)に隣接している1側面よりも長く、好ましくは少なくとも2倍、または、5倍長く、
上記トランジスタ(122)の幅は、最小面積(F)の3倍、好ましくは2倍よりも小さいことを特徴とする、請求項9に記載の回路構造(120)。 - 上記回路構造が、少なくとも1つのプロセッサ(好ましくはマイクロプロセッサ)を含み、および/または、
上記キャパシタ(124)および活性素子(122)が、特にダイナミックRAMメモリーユニットの中の、メモリーセル(120)を構成しており、および/または、
メモリーセルが、キャパシタ(122)および単一のトランジスタ(122)、または、キャパシタ(Cs)および複数のトランジスタ(M1〜M3)(好ましくは3つのトランジスタ(M1〜M3))を含んでいることを特徴とする、請求項1〜10のいずれか1項に記載の回路構造(120)。 - キャパシタ(124)を備えた集積回路構造(120)、特に請求項1〜11のいずれか1項に記載の回路構造(120)の、製造方法であって、
電気的に絶縁性の材料からなる絶縁層(14)と、半導体層(16)とを含んだ基板を配置する工程と、
キャパシタの少なくとも1つの電極領域(34)と、トランジスタ(122)の少なくとも1つの活性領域(82)とを形成するために、半導体層(16)をパターン形成する工程と、
上記半導体層(16)のパターン形成後、少なくとも1つの誘電体層(42、44、46)を形成する工程と、
上記誘電体層(42、44、46)の形成後、電極層(50)を形成する工程と、
上記絶縁領域から離れたキャパシタ(124)の電極(56)を電極層(50)に形成する工程とを、いかなる限定を加えることなく、この順序で行うことを特徴とする、方法。 - パターン形成する前の半導体層(16)に少なくとも1つの絶縁層(18、20)(、好ましくは窒化シリコン層(18)および/または第1の厚さを有する酸化物層(20))を供給する工程、および/または、
上記絶縁領域近傍の電極(34)を、好ましくは誘電体層(42、44、46)を製造する前にドープする工程、および/または、
上記誘電体層(42、44、46)を、トランジスタ(122)の活性領域(82)に位置する誘電体層と同時に形成する工程、および/または、
上記トランジスタ(122)の制御電極(54)を、絶縁領域から離れた電極領域(56)の形成と同時に形成する工程から成ることを特徴とする、請求項12に記載の方法。 - 上記電極層(50)の形成後に補助層(52)(好ましくは、酸化物層(18、20)よりも厚い補助層)を形成する工程、および/または、
上記絶縁領域から離れた電極領域(56)、および/または、補助層(52)をハードマスクとして用いたトランジスタの制御電極(54)を、パターン形成する工程から成ることを特徴とする、請求項12または13に記載の方法。 - 上記トランジスタ(142)の制御電極(54)のパターン形成後に、他の補助層(60)(好ましくは窒化シリコン層)を供給する工程、および/または、
上記他の補助層(60)に異方性エッチングを施す工程から成ることを特徴とする、請求項12〜14のいずれか1項に記載の方法。 - 上記絶縁層(18、20)を再びパターン形成する工程、好ましくは、補助層(52)の厚さを薄くする、および/または、前記補助層(52)を完全には除去しない工程、および/または、
上記絶縁層(20)のパターン形成後に、他の補助層(60)に異方性エッチングを施す工程から成ることを特徴とする、請求項12〜15のいずれか1項に記載の方法。 - 上記絶縁領域から離れた電極領域(56)の形成後、および/または、トランジスタ(122)の制御電極(54)のパターン形成後、半導体材料(16)からなる露出領域に選択的エピタキシーを行う工程、および/または、
上記絶縁領域から離れた電極領域(56)の形成後、および/または、制御電極(54)のパターン形成後、および、好ましくはエピタキシー後、トランジスタ(122)の端子領域(70、72)をドープする工程から成ることを特徴とする、請求項12〜16のいずれか1項に記載の方法。 - 好ましくは、絶縁層(18、20)のパターン形成後、および/または、選択的エピタキシー実施後、補助層(52)を除去する工程、および/または、
上記電極層(54)および/または露出した半導体領域(16)の上に、金属半導体化合物を選択的に形成(特に選択的ケイ化物形成)する工程から成ることを特徴とする、請求項12〜17のいずれか1項に記載の方法。
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JP2010503200A (ja) * | 2006-08-28 | 2010-01-28 | マイクロン テクノロジー, インク. | 半導体装置、半導体部品および半導体構造、ならびに半導体装置、半導体部品および半導体構造を形成する方法 |
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Also Published As
Publication number | Publication date |
---|---|
TWI255038B (en) | 2006-05-11 |
US20080038888A1 (en) | 2008-02-14 |
JP4598531B2 (ja) | 2010-12-15 |
EP1552546A2 (de) | 2005-07-13 |
CN100468621C (zh) | 2009-03-11 |
EP2169715A3 (de) | 2013-07-10 |
CN1706027A (zh) | 2005-12-07 |
US8124475B2 (en) | 2012-02-28 |
US7820505B2 (en) | 2010-10-26 |
WO2004038770A3 (de) | 2004-09-23 |
DE10248722A1 (de) | 2004-05-06 |
US20060003526A1 (en) | 2006-01-05 |
US7291877B2 (en) | 2007-11-06 |
EP2169715B1 (de) | 2015-04-22 |
CN101286517B (zh) | 2011-04-27 |
US20090184355A1 (en) | 2009-07-23 |
WO2004038770A2 (de) | 2004-05-06 |
TW200411908A (en) | 2004-07-01 |
EP2169715A2 (de) | 2010-03-31 |
CN101286517A (zh) | 2008-10-15 |
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