JP6537082B2 - 炭化ケイ素装置におけるオーミック接触のためのシステム及び方法 - Google Patents
炭化ケイ素装置におけるオーミック接触のためのシステム及び方法 Download PDFInfo
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- JP6537082B2 JP6537082B2 JP2017241267A JP2017241267A JP6537082B2 JP 6537082 B2 JP6537082 B2 JP 6537082B2 JP 2017241267 A JP2017241267 A JP 2017241267A JP 2017241267 A JP2017241267 A JP 2017241267A JP 6537082 B2 JP6537082 B2 JP 6537082B2
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- Prior art keywords
- silicon carbide
- carbide device
- layer
- nickel
- nickel silicide
- Prior art date
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- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 176
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 173
- 238000000034 method Methods 0.000 title claims description 96
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 160
- 229910021334 nickel silicide Inorganic materials 0.000 claims description 91
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 claims description 91
- 229910052759 nickel Inorganic materials 0.000 claims description 76
- 238000000137 annealing Methods 0.000 claims description 32
- 238000000151 deposition Methods 0.000 claims description 26
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 16
- 239000010936 titanium Substances 0.000 claims description 16
- 229910052719 titanium Inorganic materials 0.000 claims description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 239000010703 silicon Substances 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 11
- 239000004065 semiconductor Substances 0.000 claims description 9
- 230000005669 field effect Effects 0.000 claims description 7
- 229910005883 NiSi Inorganic materials 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 239000003989 dielectric material Substances 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000005229 chemical vapour deposition Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000005380 borophosphosilicate glass Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000005360 phosphosilicate glass Substances 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000000059 patterning Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000004528 spin coating Methods 0.000 description 3
- 238000001039 wet etching Methods 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000005667 attractant Substances 0.000 description 1
- 230000031902 chemoattractant activity Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000992 sputter etching Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Inorganic Chemistry (AREA)
- Electrodes Of Semiconductors (AREA)
Description
en
図8へ戻り、方法70は、ゲート30と接触領域54との間に誘電スペーサを作製するために、ブロック74において堆積した共形の誘電体層のブランケットエッチングを行うステップ(ブロック76)に続く。例えば、図11へ移ると、ブロック74において堆積した誘電体層94のブランケットエッチング(例えばブロック76に記載するようなもの)の後の炭化ケイ素装置12が示されている。図11に示すように、ブランケットエッチングは、誘電体層94の殆どを除去して、接触領域54を露出させるが、ゲート28と炭化ケイ素装置12の接触領域54との間に配設されたスペーサ96を残す。ブロック74において堆積した誘電体層94の厚み及びブロック76のブランケットエッチング条件を制御することにより、誘電スペーサ96の幅98を制御し得ることを認められたい。
12:炭化ケイ素装置
14:基材本体
16:N + SiC基板
18:N+SiCバッファ層
20:N−SiCドリフト層
22:Pウェル
24:N +フィールド
26:P+ベース
28:金属ゲート
30:ゲート誘電体層
52:共形誘電体層
54:接触面積
56:エッジ
58:距離
60:ニッケル層
62:ケイ化ニッケル層
70:炭化ケイ素装置に自己整列型オーミック接触を形成する方法
90:誘電体層
92:一致型エッジ
94:誘電体層
96:スペーサ
98:スペーサ幅
100:チタン/アルミニウム層
102:ケイ化ニッケル
104:ニッケル層
Claims (21)
- 炭化ケイ素装置であって、
炭化ケイ素基材の一部の上に配設されたゲート電極と、
前記ゲート電極の上に配設された誘電フィルムと、
前記ゲート電極の近傍に配設された接触領域であって、前記接触領域が、前記炭化ケイ素基材のウェルのベースと、前記ウェルのベースの両側に配置された2つの領域とを含み、前記ウェルのベースが第1の導電性タイプでドープされており、前記2つの領域が、前記第1の導電性タイプとは反対の第2の導電性タイプでドープされいる、前記接触領域と、
前記接触領域の上に配置された複数の層と、
を有し、
前記複数の層が、前記炭化ケイ素装置の前記接触領域にオーミック接触をもたらすように構成され、
前記複数の層が、前記ウェルのベースの両側の各々に配置された前記2つの領域の一部に渡って、前記ウェルのベースの上面の全体の上に延び、前記ウェルのベースの前記上面に直接接触し、
前記複数の層が、前記炭化ケイ素装置の前記接触領域の前記ウェルのベースの第1の部分の上に配設されたチタン/アルミニウム層を含み、
前記複数の層が、前記2つの領域の一部の上に配設されたケイ化ニッケル層を含み、
前記ケイ化ニッケル層が、前記炭化ケイ素装置の前記接触領域の前記ウェルのベースの第2の部分の表面の上に直接接続する、炭化ケイ素装置。 - 前記チタン/アルミニウム層の上に配置されたニッケル層を有する、請求項1に記載の炭化ケイ素装置。
- 前記炭化ケイ素装置の前記接触領域が、前記ゲート電極から離れて配置される、請求項1または2に記載の炭化ケイ素装置。
- 前記炭化ケイ素装置の前記接触領域と前記ゲート電極との間に配置された誘電スペーサを含み、前記誘電スペーサが、前記ゲート電極に対して、前記炭化ケイ素装置の前記接触領域を自己整列するように構成される、請求項3に記載の炭化ケイ素装置。
- 前記第1の導電性タイプがP型であり、前記第2の導電性タイプがN型である、請求項1乃至4のいずれかに記載の炭化ケイ素装置。
- 前記ケイ化ニッケル層のニッケル対ケイ素比が、2.6〜1.0である、請求項1乃至5のいずれかに記載の炭化ケイ素装置。
- 前記ケイ化ニッケル層のニッケル対ケイ素比が、2.6〜2.0である、請求項6に記載の炭化ケイ素装置。
- 前記ケイ化ニッケル層のニッケル対ケイ素比が、2.0〜1.0である、請求項6に記載の炭化ケイ素装置。
- 前記炭化ケイ素装置が、金属酸化物半導体電界効果トランジスタ(MOSFET)または接合ゲート電界効果トランジスタ(JFET)である、請求項1乃至8のいずれかに記載の炭化ケイ素装置。
- 炭化ケイ素装置を形成するステップを含む方法であって、
前記炭化ケイ素装置が、炭化ケイ素基材の一部の上に配設されたゲート電極を有し、前記方法が、
前記ゲート電極の上に誘電フィルムを堆積させるステップと、
前記炭化ケイ素装置の前記ゲート電極の近傍に接触領域を形成するステップであって、前記接触領域を形成するステップが、前記炭化ケイ素基材のウェルのベースを形成するステップと、前記ウェルのベースの両側に配置された2つの領域を形成するステップとを含み、前記ウェルのベースが第1の導電性タイプでドープされており、前記2つの領域が、前記第1の導電性タイプとは反対の第2の導電性タイプでドープされおり、前記炭化ケイ素装置の一面が、前記炭化ケイ素装置の前記接触領域の上面を含む、前記ステップと、
前記炭化ケイ素装置の前記接触領域と前記ゲート電極との間に誘電スペーサを提供する一方、前記誘電フィルムをエッチングして、前記炭化ケイ素装置の前記接触領域を露出するステップと、
前記炭化ケイ素装置の前記一面にニッケル層を堆積させるステップと、
前記炭化ケイ素装置をアニールして、前記ニッケル層の一部を、1種以上のケイ化ニッケル種を含むケイ化ニッケル層であって、前記炭化ケイ素装置の前記接触領域に低抵抗接触をもたらすように構成された前記ケイ化ニッケル層へと転化させるステップと、
を含み、
前記ケイ化ニッケル層が、前記ウェルのベースの両側の各々に配置された前記2つの領域の一部に渡って、前記ウェルのベースの上面の全体の上に延び、前記ウェルのベースの前記上面に直接接触する、
方法。 - 前記低抵抗接触が10−5Ωcm2未満の接触抵抗を有する、請求項10に記載の方法。
- 前記低抵抗接触が、アニール前のニッケル層の4分の1〜10分の1の接触抵抗を有する、請求項10または11に記載の方法。
- 前記炭化ケイ素装置の表面にゲート誘電体層及び前記ゲート電極を堆積させるステップを含む、請求項10乃至12のいずれかに記載の方法。
- 前記ゲート誘電体層及び前記ゲート電極の上に誘電体層を共形堆積させるステップと、
前記誘電体層及び前記ゲート誘電体層をパターニング及びエッチングして、前記炭化ケイ素装置の前記接触領域を露出させるステップと、
を含む、請求項13に記載の方法。 - 前記誘電スペーサが、前記炭化ケイ素装置の前記ゲート電極及び前記接触領域に対して前記ケイ化ニッケル層を自己整列させるように構成されている、請求項14に記載の方法。
- 前記炭化ケイ素装置をアニールするステップが、前記炭化ケイ素装置を約300℃〜約1100℃でアニールするステップを含む、請求項10乃至15のいずれかに記載の方法。
- 1種以上のケイ化ニッケル種がNi31Si12を含む、請求項16に記載の方法。
- 前記炭化ケイ素装置の1以上の誘電体表面から未反応ニッケルをエッチングするステップを含む、請求項10乃至17のいずれかに記載の方法。
- 前記未反応ニッケルをエッチングした後に前記炭化ケイ素装置の2度目のアニールを行うステップを含む、請求項18に記載の方法。
- 前記2度目のアニールが、前記炭化ケイ素装置を約500℃〜約950℃でアニールするステップを含んでおり、前記2度目のアニールの実施後に前記ケイ化ニッケル層がNi2Siを含む、請求項19に記載の方法。
- 前記2度目のアニールが、前記炭化ケイ素装置を約900℃〜約1100℃でアニールするステップを含んでおり、前記2度目のアニールの実施後に前記ケイ化ニッケル層がNiSiを含む、請求項19に記載の方法。
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