JP2012195579A - 半導体基板、電界効果トランジスタ、半導体基板の製造方法および電界効果トランジスタの製造方法 - Google Patents
半導体基板、電界効果トランジスタ、半導体基板の製造方法および電界効果トランジスタの製造方法 Download PDFInfo
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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Abstract
【解決手段】ベース基板102と第1絶縁体層104と半導体層106とを有し、ベース基板102、第1絶縁体層104および半導体層106が、ベース基板102、第1絶縁体層104、半導体層106の順に位置し、第1絶縁体層104が、アモルファス状金属酸化物またはアモルファス状金属窒化物からなり、半導体層が、第1結晶層108および第2結晶層110を含み、第1結晶層108および第2結晶層110が、ベース基板102の側から、第1結晶層108、第2結晶層110の順に位置し、第1結晶層108の電子親和力Ea1が、第2結晶層110の電子親和力Ea2より大きい半導体基板を提供する。
【選択図】図1
Description
(数1)
(ε1・d0)/(ε0・d1)>(V―δ)/δ
ただし、d0およびε0はゲート電極212と第1結晶層108とに挟まれたゲート下領域における第2絶縁体層210の厚さおよび比誘電率を示し、d1およびε1はゲート下領域における第2結晶層110の厚さおよび比誘電率を示す。δは、第2結晶層110と第1結晶層108との電子親和力の差であり、δ=Ea1−Ea2である。Vは、V=Vg−Vtで定義された電圧であり、Vgは電界効果トランジスタ200のゲート電極212に印加する電圧であり、Vtは閾値電圧である。電圧Vは、閾値電圧以上の電圧をゲート電極212にかけて電界効果トランジスタ200を動作させた場合に、ゲート下領域の第2結晶層110と第2絶縁体層210の積層構造の部分に印加される電圧として近似できる。
(数2)
ΔV=V×(d1/ε1)/((d1/ε1)+d0/ε0)
ここでΔV<δであれば多くのチャネル電子を第2絶縁体層210と第2結晶層110との間に誘起することができる。よって数3が得られる。
(数3)
V×(d1/ε1)/((d1/ε1)+d0/ε0)<δ
数3を整理することで数1が得られる。すなわち、数1の関係が満たされる場合に、第1結晶層108と第2結晶層110の界面に高移動度チャネル電子を誘起することができる。
面方位(001)のInP基板上に、MOVPE(Metal Organic Vapor Phase Epitaxy)法によりInGaAs層をエピタキシャル成長し、InGaAs層上にALD法によりAl2O3層を形成した。別途シリコン基板上にALD法によりAl2O3層を形成した。InP基板とシリコン基板のそれぞれのAl2O3層を親水化処理し、InP基板とシリコン基板とを貼り合わせた後、HCl溶液によりInPを選択的に除去した。これによりInGaAs層/Al2O3層(BOX層)/シリコン基板からなる半導体基板を作成した。
(1)10nm厚さのIn0.7Ga0.3As(単層)
(2)5nm厚さのIn0.7Ga0.3As(単層)
(3)In0.3Ga0.7As/In0.7Ga0.3As/In0.3Ga0.7Asの各厚さが2/1/3nmである積層
(4)In0.3Ga0.7As/In0.7Ga0.3As/In0.3Ga0.7Asの各厚さが2/3/3nmである積層
(5)In0.3Ga0.7As/In0.7Ga0.3As/In0.3Ga0.7Asの各厚さが2/5/3nmである積層
なお、以下の図13〜図20において、(1)〜(2)のサンプルを「バッファなし」または「単チャネル」と称する場合があり、(3)〜(5)のサンプルを「バッファあり」と称する場合がある。InGaAs層の厚さを「ボディ厚さ」と称する場合があり、(3)〜(5)のサンプルにおいてIn0.7Ga0.3Asの厚さを「チャネルの厚さ」と称する場合がある。
実施例1と同様に、面方位(001)のInP基板上に、MOVPE法によりInGaAs層をエピタキシャル成長し、InGaAs層上にALD法によりAl2O3層を形成した。別途シリコン基板上にALD法によりAl2O3層を形成した。InP基板とシリコン基板のそれぞれのAl2O3層を親水化処理し、InP基板とシリコン基板とを貼り合わせた後、HCl溶液によりInPを選択的に除去した。これによりInGaAs層/Al2O3層(BOX層)/シリコン基板からなる半導体基板を作成した。
(6)In0.3Ga0.7As/InAs/In0.3Ga0.7Asの各厚さが3/3/3nmである積層
(7)In0.3Ga0.7As/In0.7Ga0.3As/In0.3Ga0.7Asの各厚さが3/5/3nmである積層
(8)10nm厚さのIn0.7Ga0.3As(単層)
(9)20nm厚さのIn0.53Ga0.47As(単層)
なお、以下の図21〜図23において、(8)、(9)のサンプルを「バッファなし」または「単チャネル」と称する場合があり、(6)、(7)のサンプルを「バッファあり」と称する場合がある。InGaAs層の厚さを「ボディ厚さ」と称する場合があり、(8)、(9)のサンプルにおいてIn0.7Ga0.3AsまたはIn0.53Ga0.47Asの厚さを「チャネルの厚さ」と称する場合がある。
実施例1と同様に、面方位(001)のInP基板上に、MOVPE法によりInGaAs層をエピタキシャル成長し、InGaAs層上にALD法によりAl2O3層を形成した。別途シリコン基板上にALD法によりAl2O3層を形成した。InP基板とシリコン基板のそれぞれのAl2O3層を親水化処理し、InP基板とシリコン基板とを貼り合わせた後、HCl溶液によりInPを選択的に除去した。これによりInGaAs層/Al2O3層(BOX層)/シリコン基板からなる半導体基板を作成した。
(10)In0.3Ga0.7As/InAs/In0.3Ga0.7Asの各厚さが3/3/3nmである積層
(11)10nm厚さのIn0.53Ga0.47As(単層)
なお、以下の図24〜図37において、(11)のサンプルを「バッファなし」または「単チャネル」と称する場合があり、(10)のサンプルを「バッファあり」と称する場合がある。InGaAs層の厚さを「ボディ厚さ」と称する場合があり、(11)のサンプルにおいてIn0.53Ga0.47Asの厚さを「チャネルの厚さ」と称する場合がある。
参照例1:M. Radosavljevic et al., 2010 IEDM, pp. 126-129.
参照例2:M. Radosavljevic et al., 2011 IEDM, pp. 765-768.
参照例3:H. C. Chin et al., EDL 32, 2 (2011).
参照例4:J. J. Gu et al., 2011 IEDM, pp. 769-772.
Claims (14)
- ベース基板と第1絶縁体層と半導体層とを有し、
前記ベース基板、前記第1絶縁体層および前記半導体層が、前記ベース基板、前記第1絶縁体層、前記半導体層の順に位置し、
前記第1絶縁体層が、アモルファス状金属酸化物またはアモルファス状金属窒化物からなり、
前記半導体層が、第1結晶層および第2結晶層を含み、
前記第1結晶層および前記第2結晶層が、前記ベース基板の側から、前記第1結晶層、前記第2結晶層の順に位置し、
前記第1結晶層の電子親和力Ea1が、前記第2結晶層の電子親和力Ea2より大きい
半導体基板。 - 前記半導体層が、第3結晶層をさらに含み、
前記第1結晶層、前記第2結晶層および前記第3結晶層が、前記ベース基板の側から、前記第3結晶層、前記第1結晶層、前記第2結晶層の順に位置し、
前記第3結晶層の電子親和力Ea3が、前記第1結晶層の電子親和力Ea1より小さい
請求項1に記載の半導体基板。 - 前記第1結晶層がInx1Ga1−x1As(0<x1<1)からなり、
前記第2結晶層がInx2Ga1−x2As(0≦x2<1)からなり、前記第3結晶層がInx3Ga1−x3As(0≦x3<1)からなり、
x1>x2、かつ、x1>x3の関係を満足する
請求項1または請求項2に記載の半導体基板。 - 前記半導体層の厚さが、20nm以下である
請求項1から請求項3の何れか一項に記載の半導体基板。 - 請求項1から請求項4のいずれか一項に記載の半導体基板を有する電界効果トランジスタであって、前記半導体層に電気的に接続されたソース電極およびドレイン電極を備える電界効果トランジスタ。
- 前記半導体層が、前記ソース電極と接触するソース領域または前記ドレイン電極と接触するドレイン領域を有し、
前記ソース領域または前記ドレイン領域が、前記半導体層を構成するIII族原子およびV族原子からなる群から選ばれた少なくとも1種の原子と金属原子との合金を含む
請求項5に記載の電界効果トランジスタ。 - 前記金属原子がニッケル原子である
請求項6に記載の電界効果トランジスタ。 - 前記半導体層の前記ベース基板とは反対の側にゲート電極を有し、
前記ソース領域の前記ドレイン領域側に位置する界面および前記ドレイン領域の前記ソース領域側に位置する界面が、前記ゲート電極と前記ベース基板に挟まれた前記半導体層の領域であるゲート電極下領域に形成されている
請求項6または請求項7に記載の電界効果トランジスタ。 - 前記電界効果トランジスタがnチャネル型電界効果トランジスタであり、
前記ソース領域または前記ドレイン領域は、ドナー不純物原子をさらに含む
請求項6から請求項8の何れか一項に記載の電界効果トランジスタ。 - 前記電界効果トランジスタがpチャネル型電界効果トランジスタであり、
前記ソース領域または前記ドレイン領域は、アクセプタ不純物原子をさらに含む
請求項6から請求項8の何れか一項に記載の電界効果トランジスタ。 - 半導体層形成基板上に半導体層をエピタキシャル結晶成長法により形成する半導体層形成ステップと、
前記半導体層上に第1絶縁体層を原子層堆積法により成膜する第1絶縁体層形成ステップと、
前記第1絶縁体層上にベース基板を接合する接合ステップと、
前記半導体層形成基板を除去する除去ステップと、を備え、
前記半導体層形成ステップが、第2結晶層をエピタキシャル結晶成長法により形成する第1ステップと、前記第1ステップの後に、前記第2結晶層の電子親和力Ea2より大きい電子親和力Ea1を有する第1結晶層をエピタキシャル結晶成長法により形成する第2ステップと、を有する
半導体基板の製造方法。 - 前記半導体層形成ステップが、前記第2ステップの後に、前記第1結晶層の電子親和力Ea1より小さい電子親和力Ea3を有する第3結晶層をエピタキシャル結晶成長法により形成する第3ステップをさらに有する
請求項11に記載の半導体基板の製造方法。 - 請求項11または請求項12に記載の半導体基板の製造方法により製造された前記半導体基板の前記半導体層上に、原子層堆積法により第2絶縁体層を成膜するステップと、
前記第2絶縁体層上にゲート電極を形成するステップと、
前記ゲート電極が形成された領域以外の前記第2絶縁体層の一部をエッチングして、前記半導体層に達する開口を形成するステップと、
前記開口の底部において前記半導体層に接する金属膜を形成するステップと、
前記金属膜を熱処理して、前記金属膜と接する前記半導体層の部分にソース領域またはドレイン領域の少なくとも一方を形成するステップと、
を備えた電界効果トランジスタの製造方法。 - 前記ソース領域または前記ドレイン領域の少なくとも一方を形成するステップにおいて、前記熱処理の温度および時間から選択された1以上の条件を制御して、前記ソース領域の前記ドレイン領域側に位置する界面および前記ドレイン領域の前記ソース領域側に位置する界面から選択された1以上の界面の位置を、前記ゲート電極と前記ベース基板に挟まれた前記半導体層の領域であるゲート電極下領域に形成するよう制御する
請求項13に記載の電界効果トランジスタの製造方法。
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JP2011029619A (ja) * | 2009-06-24 | 2011-02-10 | Semiconductor Energy Lab Co Ltd | 半導体基板の再生処理方法及びsoi基板の作製方法 |
Cited By (1)
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WO2023223375A1 (ja) * | 2022-05-16 | 2023-11-23 | 日本電信電話株式会社 | 半導体積層構造およびその作製方法、ならびに半導体装置の製造方法 |
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US20130341721A1 (en) | 2013-12-26 |
CN103384917B (zh) | 2016-03-09 |
KR20140027938A (ko) | 2014-03-07 |
US8901656B2 (en) | 2014-12-02 |
WO2012117745A1 (ja) | 2012-09-07 |
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CN103384917A (zh) | 2013-11-06 |
TW201244080A (en) | 2012-11-01 |
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