JP6851804B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6851804B2 JP6851804B2 JP2016242417A JP2016242417A JP6851804B2 JP 6851804 B2 JP6851804 B2 JP 6851804B2 JP 2016242417 A JP2016242417 A JP 2016242417A JP 2016242417 A JP2016242417 A JP 2016242417A JP 6851804 B2 JP6851804 B2 JP 6851804B2
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- gate electrode
- electrode
- graphene layer
- gate
- substrate
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- 239000004065 semiconductor Substances 0.000 title claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 62
- 229910021389 graphene Inorganic materials 0.000 claims description 61
- 239000000758 substrate Substances 0.000 claims description 45
- 239000010408 film Substances 0.000 description 103
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 15
- 229910052814 silicon oxide Inorganic materials 0.000 description 15
- 238000000034 method Methods 0.000 description 13
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- 230000000052 comparative effect Effects 0.000 description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 7
- 229910052737 gold Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 238000005092 sublimation method Methods 0.000 description 2
- 238000007736 thin film deposition technique Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
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- 239000011261 inert gas Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Description
最初に本願発明の実施形態の内容を列記して説明する。
(1)本願発明の一実施形態は、基板上に設けられたグラフェン層と、前記グラフェン層上に設けられたソース電極およびドレイン電極と、前記グラフェン層上に設けられたゲート絶縁膜と、前記ソース電極と前記ドレイン電極との間における前記ゲート絶縁膜上に設けられた第1ゲート電極と、前記第1ゲート電極と前記ドレイン電極との間であり、かつ前記基板内に設けられた第2ゲート電極と、を具備する半導体装置である。これにより、第1ゲート電極と第2ゲート電極との距離を小さくでき、半導体装置の性能を向上させることができる。
(2)前記グラフェン層と第2ゲート電極との間に設けられた絶縁膜を具備することが好ましい。これにより、グラフェン層と第2ゲート電極との電気的接触を抑制できる。
(3)前記第2ゲート電極は、前記基板の一部を介し前記グラフェン層下に設けられていることが好ましい。これにより、グラフェン層と第2ゲート電極との電気的接触を抑制できる。
(4)上面視において、前記第1ゲート電極の前記ドレイン電極側の一部に前記第2ゲート電極の前記ソース電極側の一部が重なることが好ましい。これにより、半導体装置の性能を向上させることができる。
(5)前記第2ゲート電極には、基準電位が供給されることが好ましい。これにより、半導体装置の性能を向上させることができる。
(6)前記第2ゲート電極には、前記ソース電極に供給される電位が供給されることが好ましい。これにより、半導体装置の性能を向上させることができる。
本発明の実施形態にかかる半導体装置の具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。
実施例1の効果について説明するため、比較例1についてシミュレーションを行った。図3は、比較例1のシミュレーションに用いた2次元構造を示す図である。Xは平面方向、Yは高さ方向を示している。図3に示すように、比較例1には絶縁膜13は設けられていない。第2ゲート電極22は、第1ゲート電極20とドレイン電極26との間のゲート絶縁膜14上に設けられている。第1ゲート電極20および第2ゲート電極22は、チタン膜20a、金膜20bおよびニッケル膜20cを有している。第1ゲート電極20および第2ゲート電極22のゲート長をそれぞれLg1およびLg2とする。第1ゲート電極20と第2ゲート電極22との距離をLggとする。第1ゲート電極20とソース電極24との距離および第2ゲート電極22とドレイン電極26との距離をLgoとする。その他の構成は実施例1と同じであり説明を省略する。
基板10:6H−SiC基板
グラフェン層12:膜厚が0.35nm
酸化アルミニウム(Al2O3)膜16:膜厚が5nm
酸化シリコン(SiO2)膜18:膜厚が30nm
チタン膜(Ti)20a:膜厚が5nm
金(Au)膜20b:膜厚が150nm
ニッケル(Ni)膜20c:膜厚が15nm
ソース電極24、ドレイン電極26:膜厚が15nmのニッケル(Ni)膜
Lg1=Lg2=0.3μm
Lgo=0.01μm
Lgg:0.02μm、0.2μm、0.5μmおよび1.0μm
第1ゲート電極20に印加される電圧Vg1=2V
第2ゲート電極22に印加される電圧Vg1=5V
ソース電極24に印加される電圧Vs=0V
ドレイン電極26に印加される電圧Vd=3V
次に、実施例2に係るFETを製造する一例を説明する。図6(a)から図8(c)は、実施例2に係るFETの製造方法を示す断面図である。図6(a)に示すように、6H−SiC基板10の表面を洗浄する。洗浄の条件は、アセトン処理を5分、エタノール処理を5分、および水洗を5分である。基板10の洗浄として、例えばRCA処理を行なってもよい。基板10としては、SiC層が形成されたSi基板でもよい。SiC熱昇華法を用いグラフェン層12を形成する場合、基板10の最上面はSiC層である。例えばCVD(Chemical Vapor Deposition)法を用いグラフェン層12を形成する場合、基板10の最表面はSiC以外の材料層でもよい。
基板上に設けられたグラフェン層と、
前記グラフェン層上に設けられたソース電極およびドレイン電極と、
前記グラフェン層上に設けられたゲート絶縁膜と、
前記ソース電極と前記ドレイン電極との間における前記ゲート絶縁膜上に設けられた第1ゲート電極と、
前記第1ゲート電極と前記ドレイン電極との間であり、かつ前記基板内に設けられた第2ゲート電極と、
を具備する半導体装置。
(付記2)
前記グラフェン層と第2ゲート電極との間に設けられた絶縁膜を具備する付記1に記載の半導体装置。
(付記3)
前記第2ゲート電極は、前記基板の一部を介し前記グラフェン層下に設けられている付記1に記載の半導体装置。
(付記4)
上面視において、前記第1ゲート電極の前記ドレイン電極側の一部に前記第2ゲート電極の前記ソース電極側の一部が重なる付記1に記載の半導体装置。
(付記5)
前記第2ゲート電極には、基準電位が供給される付記1に記載の半導体装置。
(付記6)
前記第2ゲート電極には、前記ソース電極に供給される電位が供給される付記1に記載の半導体装置。
(付記7)
前記ゲート絶縁膜は、酸化アルミニウム膜を含む付記1に記載の半導体装置。
(付記8)
前記ゲート絶縁膜は、前記酸化アルミニウム膜に設けられた酸化シリコン膜を含む付記7に記載の半導体装置。
(付記9)
前記基板はSiC基板である付記1に記載の半導体装置。
10a 基板の一部
12 グラフェン層
13 絶縁膜
14 ゲート絶縁膜
15 アルミニウム膜
16 酸化アルミニウム膜
18 酸化シリコン膜
20 第1ゲート電極
20a チタン膜
20b 金膜
20c ニッケル膜
22 第2ゲート電極
23 金属層
24 ソース電極
25 穴
26 ドレイン電極
28 オーミック電極
30 配線
Claims (6)
- 基板上に設けられたグラフェン層と、
前記グラフェン層上に設けられたソース電極およびドレイン電極と、
前記グラフェン層上に設けられたゲート絶縁膜と、
前記ソース電極と前記ドレイン電極との間における前記ゲート絶縁膜上に設けられた第1ゲート電極と、
前記第1ゲート電極と前記ドレイン電極との間であり、かつ前記基板内に設けられた第2ゲート電極と、
を具備し、
前記第2ゲート電極は、前記基板の一部を介し前記グラフェン層下に設けられている半導体装置。 - 前記第2ゲート電極には、基準電位が供給される請求項1に記載の半導体装置。
- 基板上に設けられたグラフェン層と、
前記グラフェン層上に設けられたソース電極およびドレイン電極と、
前記グラフェン層上に設けられたゲート絶縁膜と、
前記ソース電極と前記ドレイン電極との間における前記ゲート絶縁膜上に設けられた第1ゲート電極と、
前記第1ゲート電極と前記ドレイン電極との間であり、かつ前記基板内に設けられた第2ゲート電極と、
を具備し、
前記第2ゲート電極には、前記ソース電極に供給される電位が供給される半導体装置。 - 前記グラフェン層と前記第2ゲート電極との間に設けられた絶縁膜を具備する請求項3に記載の半導体装置。
- 前記第2ゲート電極は、前記基板の一部を介し前記グラフェン層下に設けられている請求項3または4に記載の半導体装置。
- 上面視において、前記第1ゲート電極の前記ドレイン電極側の一部に前記第2ゲート電極の前記ソース電極側の一部が重なる請求項1から5のいずれか一項に記載の半導体装置。
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