JP6791723B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6791723B2 JP6791723B2 JP2016217291A JP2016217291A JP6791723B2 JP 6791723 B2 JP6791723 B2 JP 6791723B2 JP 2016217291 A JP2016217291 A JP 2016217291A JP 2016217291 A JP2016217291 A JP 2016217291A JP 6791723 B2 JP6791723 B2 JP 6791723B2
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- electrode
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- graphene layer
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- 239000004065 semiconductor Substances 0.000 title claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 66
- 229910021389 graphene Inorganic materials 0.000 claims description 65
- 239000000758 substrate Substances 0.000 claims description 19
- 239000010408 film Substances 0.000 description 74
- 230000000052 comparative effect Effects 0.000 description 26
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 229910052814 silicon oxide Inorganic materials 0.000 description 10
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- 238000002347 injection Methods 0.000 description 3
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
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- 238000000231 atomic layer deposition Methods 0.000 description 2
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium 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
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 230000003071 parasitic effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 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。
本願発明は、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ゲート電極および第2ゲート電極と、を具備し、前記第1ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ソース電極側に設けられ、前記第2ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ドレイン電極側に設けられ、前記第2ゲート電極のゲート長は前記第1ゲート電極のゲート長より小さい半導体装置である。
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および比較例2についてシミュレーションを行った。図3(a)および図3(b)は、比較例1および比較例2に係るFETの断面図である。図3(a)に示すように、比較例1は、ソース電極24とドレイン電極26との間に第1ゲート電極20が1本のみのシングルゲート構造である。図3(b)に示すように、比較例2は、実施例1と同様にソース電極24とドレイン電極26との間に第1ゲート電極20および第2ゲート電極22が設けられたデュアルゲート構造であるが、ゲート長Lg1=Lg2である。その他の構成は実施例1と同じであり説明を省略する。
次に、実施例1に係るFETを製造する一例を説明する。図6(a)から図7(c)は、実施例1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ゲート電極および第2ゲート電極と、
を具備し、
前記第1ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ソース電極側に設けられ、前記第2ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ドレイン電極側に設けられ、
前記第2ゲート電極のゲート長は前記第1ゲート電極のゲート長より小さい半導体装置。
(付記2)
前記第1ゲート電極と前記第2ゲート電極との間の距離と、前記第2ゲート電極のゲート長と、の和は、前記第1ゲート電極のゲート長以下である付記1に記載の半導体装置。
(付記3)
前記第1ゲート電極と前記第2ゲート電極との間に前記グラフェン層に接触するオーミック電極を具備する付記1に記載の半導体装置。
(付記4)
前記第2ゲート電極には、基準電位が供給される付記1から3のいずれか一項に記載の半導体装置。
(付記5)
前記第1ゲート電極のゲート長は1μm以下である付記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上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)
前記第2ゲート電極のゲート長は前記第1ゲート電極のゲート長の1/2以下である付記1に記載の半導体装置。
(付記10)
前記基板はSiC基板である付記1に記載の半導体装置。
12 グラフェン層
14 ゲート絶縁膜
15 Al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
22 第2ゲート電極
24 ソース電極
26 ドレイン電極
28 オーミック電極
30 配線
Claims (5)
- 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ゲート電極および第2ゲート電極と、
を具備し、
前記第1ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ソース電極側に設けられ、前記第2ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ドレイン電極側に設けられ、
前記第2ゲート電極のゲート長は前記第1ゲート電極のゲート長より小さく、
前記第1ゲート電極と前記第2ゲート電極との間に前記グラフェン層に接触するオーミック電極を具備する半導体装置。 - 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ゲート電極および第2ゲート電極と、
を具備し、
前記第1ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ソース電極側に設けられ、前記第2ゲート電極は前記ソース電極と前記ドレイン電極との間の前記ドレイン電極側に設けられ、
前記第2ゲート電極のゲート長は前記第1ゲート電極のゲート長より小さく、
前記第2ゲート電極には、基準電位が供給される半導体装置。 - 前記第1ゲート電極と前記第2ゲート電極との間の距離と、前記第2ゲート電極のゲート長と、の和は、前記第1ゲート電極のゲート長以下である請求項1から3のいずれか一項に記載の半導体装置。
- 前記第1ゲート電極のゲート長は1μm以下である請求項1から4のいずれか一項に記載の半導体装置。
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US15/804,677 US20180130912A1 (en) | 2016-11-07 | 2017-11-06 | Field effect transistor including graphene layer |
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US10304967B1 (en) | 2018-03-02 | 2019-05-28 | Texas Instruments Incorporated | Integration of graphene and boron nitride hetero-structure device over semiconductor layer |
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GB2619270A (en) * | 2022-05-06 | 2023-12-06 | Paragraf Ltd | Frequency multiplier circuit |
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