KR100799391B1 - 박막 음향공진기 및 그 제조방법 - Google Patents
박막 음향공진기 및 그 제조방법 Download PDFInfo
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- KR100799391B1 KR100799391B1 KR1020037014616A KR20037014616A KR100799391B1 KR 100799391 B1 KR100799391 B1 KR 100799391B1 KR 1020037014616 A KR1020037014616 A KR 1020037014616A KR 20037014616 A KR20037014616 A KR 20037014616A KR 100799391 B1 KR100799391 B1 KR 100799391B1
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- Prior art keywords
- layer
- thin film
- piezoelectric
- electrode
- acoustic resonator
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- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Multimedia (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
Description
Claims (54)
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- 압전체층과, 상기 압전체층의 제 1 표면에 접합된 제 1 전극과, 상기 압전체층의 상기 제 1 표면과 반대측의 제 2 표면에 접합된 제 2 전극을 갖고 있고, 상기 제 1 전극의 상기 압전체층 쪽의 표면은 높이의 RMS 변동이 25nm 이하이고, 상기 압전체층의 상기 제 2 표면은 높이의 RMS 변동이 상기 압전체층의 두께의 5% 이하이고, 상기 제 2 전극의 표면의 파형높이는 상기 압전체층의 두께의 25% 이하인 것을 특징으로 하는 박막 음향공진기.
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- 압전체층과, 상기 압전체층의 제 1 표면에 접합된 제 1 전극과, 상기 압전체층의 상기 제 1 표면과 반대측의 제 2 표면에 접합된 제 2 전극을 갖고 있고, 상기 제 1 전극의 상기 압전체층 쪽의 표면은 높이의 RMS 변동이 25nm 이하이고, 상기 제 2 전극은 중앙부와 그 중앙부보다 두꺼운 외주부를 갖으며, 상기 제 2 전극은 상기 중앙부의 두께변동이 그 중앙부의 두께의 1% 이하이고, 상기 중앙부의 표면의 파형높이는 상기 압전체층의 두께의 25% 이하이고, 상기 외주부의 두께는 상기 중앙부의 높이의 1.1배 이상인 것을 특징으로 하는 박막 음향공진기.
- 제 17항에 있어서,상기 외주부는 상기 중앙부의 주위에 프레임형상으로 위치하는 것을 특징으로 하는 박막 음향공진기.
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- 제 17항에 있어서,상기 외주부는 상기 제 2 전극의 외부가장자리로부터 40㎛까지의 거리의 범위 내에 위치하는 것을 특징으로 하는 박막 음향공진기.
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- 제 13항 또는 제 17항에 있어서,상기 압전체층과 상기 제 1 전극과 상기 제 2 전극으로 이루어지는 끼워맞춤구조체는 기판의 표면에 형성된 홈을 지나치도록 상기 기판에 의해 가장자리부가 지지되어 있는 것을 특징으로 하는 박막 음향공진기.
- 제 23항에 있어서,상기 기판의 표면 상에는 상기 홈을 지나치도록 형성된 절연체층이 배치되어 있고, 그 절연체층 상에 상기 끼워맞춤구조체가 형성되어 있는 것을 특징으로 하는 박막 음향공진기.
- 압전체층과, 상기 압전체층의 제 1 표면에 접합된 제 1 전극과, 상기 압전체층의 상기 제 1 표면과 반대측의 제 2 표면에 접합된 제 2 전극을 갖는 박막 음향공진기를 제조하는 방법에 있어서,기판의 표면에 홈을 형성하고, 그 홈 내에 희생층을 충전하고, 그 희생층의 표면을 높이의 RMS 변동이 20nm 이하가 되도록 연마하며, 상기 희생층 표면의 일부 영역과 상기 기판 표면의 일부 영역에 걸쳐 그들 위에 상기 제 1 전극을 형성하고, 상기 제 1 전극 상에 상기 압전체층을 그 압전체층의 제 2 표면 높이의 RMS 변동이 상기 압전체층의 두께의 5% 이하로 되도록 형성하며, 상기 압전체층 상에 상기 제 2 전극을 그 제 2 전극 표면의 파형높이가 상기 압전체층의 두께의 25% 이하로 되도록 형성하고, 상기 압전체층과 상기 제 1 전극과 상기 제 2 전극으로 이루어진 끼워맞춤구조체의 단부에 맞게 상기 희생층의 상측 부분에 개구를 형성하고, 상기 개구로 에칭액을 공급하고, 상기 홈 내에서 상기 희생층을 에칭제거하는 것을 특징으로 하는 박막 음향공진기의 제조방법.
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- 제 25항에 있어서,상기 제 1 전극을 두께 150nm 이하로 형성하고, 상기 제 1 전극의 상면을 높이의 RMS 변동이 20nm 이하가 되도록 하는 것을 특징으로 하는 박막 음향공진기의 제조방법.
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- 제 25항에 있어서,상기 희생층 위에 상기 제 1 전극을 형성하기에 앞서 절연체층을 형성하는 것을 특징으로 하는 박막 음향공진기의 제조방법.
- 기판과, 그 기판 상에 배치되고, 그 기판측의 하방전극층 및 이것과 쌍을 이루는 상방전극층 사이에 압전체 박막층을 끼우도록 적층하여 이루어지는 끼워맞춤구조체를 구비하는 박막 음향공진기에 있어서,상기 끼워맞춤구조체는 상기 하방전극층과 상기 기판 사이에 위치하며 또한 상기 하방전극층과 접합된 밀착전극층을 추가로 갖고 있고, 그 밀착전극층은 상기 기판에 상기 끼워맞춤구조체의 진동을 허용하도록 형성된 홈의 주위에서 상기 기판과 접합되어 있는 것을 특징으로 하는 박막 음향공진기.
- 제 30항에 있어서,상기 밀착전극층은 환상으로 형성되어 있는 것을 특징으로 하는 박막 음향공진기.
- 제 30항에 있어서,상기 상방전극층은 상기 밀착전극층의 내측에 대응하는 영역에 위치하는 것을 특징으로 하는 박막 음향공진기.
- 제 30항에 있어서,상기 밀착전극층은 Ti, Cr, Ni, Ta로부터 선택되는 적어도 한 종류를 포함하는 재료로 구성되어 있는 것을 특징으로 하는 박막 음향공진기.
- 제 30항에 있어서,상기 하방전극층은 Au, Pt, W, Mo로부터 선택되는 적어도 한 종류를 포함하는 재료로 구성되어 있는 것을 특징으로 하는 박막 음향공진기.
- 제 30항에 있어서,상기 압전체 박막층은 AlN 또는 Zn0로 구성되어 있는 것을 특징으로 하는 박막 음향공진기.
- 제 30항에 기재된 박막 음향공진기를 제조하는 방법에 있어서,홈이 형성되어 있는 기판의 표면에서 상기 홈의 주위에 밀착전극층을 형성하며, 그 밀착전극층보다 내측의 상기 홈에 대응하는 영역에서 상기 기판의 표면 상에 희생층을 형성하고, 그 희생층의 표면을 연마하여 높이의 RMS 변동이 25nm 이하가 되도록 평활화하고, 상기 희생층 및 상기 밀착전극층 위에 하방전극층, 압전체 박막층 및 상방전극층을 차례로 형성한 후에 상기 희생층을 제거하는 것을 특징으로 하는 박막 음향공진기의 제조방법.
- 제 37항에 있어서,상기 희생층의 표면을 연마하여 높이의 RMS 변동이 20nm 이하가 되도록 평활화하는 것을 특징으로 하는 박막 음향공진기의 제조방법.
- 제 37항에 있어서,상기 희생층의 형성은, 우선 상기 기판 및 상기 밀착전극층을 덮도록 희생층재료의 층을 형성하고, 이어서 그 희생층재료의 층을 상기 밀착전극층의 표면이 노출되도록 연마함으로써 행해지는 것을 특징으로 하는 박막 음향공진기의 제조방법.
- 제 37항에 있어서,상기 희생층의 제거는 에칭에 의해 행해지는 것을 특징으로 하는 박막 음향공진기의 제조방법.
- 제 37항에 있어서,상기 희생층으로서 유리 또는 플라스틱을 이용하는 것을 특징으로 하는 박막 음향공진기의 제조방법.
- 기판과, 그 기판 상에 형성된 압전 적층구조체를 갖고 있고, 상기 압전 전극구조체의 일부를 포함하여 진동부가 구성되어 있으며, 상기 압전 전극구조체는 하부전극, 압전체막 및 상부전극을 상기 기판측에서 이 순서대로 적층하여 이루어지는 것이며, 상기 기판은 상기 진동부에 대응하는 영역에서 그 진동부의 진동을 허용하는 공극을 형성하고 있는 압전 박막공진자에 있어서,상기 압전체막이 질화알루미늄을 주성분으로 하는 것이고, 상기 하부전극 및 상기 상부전극이 몰리브덴을 주성분으로 하는 것이며, 상기 진동부는 상기 압전 적층구조체에 접합된 적어도 1층의 산화실리콘 또는 질화실리콘을 주성분으로 하는 절연층의 적어도 일부를 포함하여 이루어지는 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,상기 압전체막은 상기 질화알루미늄의 함유량이 90당량% 이상인 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,상기 절연층은 상기 산화실리콘 또는 질화실리콘의 함유량이 50당량% 이상인 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,상기 하부전극 및 상기 상부전극은 상기 몰리브덴의 함유량이 80당량% 이상인 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,상기 절연층 중의 하나가 상기 기판의 표면 상에 형성되어 있는 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,상기 절연층 중의 하나가 상기 압전 적층구조체의 상기 기판과 반대쪽의 표면 상에 형성되어 있는 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,상기 기판은 실리콘단결정으로 이루어지는 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,상기 상부전극은 서로 격리되어 형성된 제 1 전극부와 제 2 전극부로 이루어지는 것을 특징으로 하는 압전 박막공진자.
- 제 42항에 있어서,2.0㎓ 근방에서의 공진주파수 및 반공진주파수의 측정값으로부터 구한 전기기계결합계수가 4.0∼6.5%이고, 음향품질계수가 750∼2000이며, 공진주파수의 온도계수가 -20∼20ppm/℃인 것을 특징으로 하는 압전 박막공진자.
- 제 13항 또는 제 17항에 있어서,상기 제1전극의 두께가 150nm 이하인 것을 특징으로 하는 박막 음향공진기.
- 제 24항에 있어서,상기 압전체층의 두께 t와 상기 절연층의 두께 t'는 0.1≤t'/t≤0.5 의 관계를 만족시키는 것을 특징으로 하는 박막 음향공진기.
- 제 25항에 있어서,상기 희생층의 표면을 연마하기 전에, 상기 희생층을 RTA(Rapid Thermal Anneal)법으로 750~950℃의 온도에서 열처리하는 것을 특징으로 하는 박막 음향공진기의 제조방법.
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JPJP-P-2001-00141848 | 2001-05-11 | ||
JP2001141845A JP2005236337A (ja) | 2001-05-11 | 2001-05-11 | 薄膜音響共振器及びその製造方法 |
JP2001141848A JP2005236338A (ja) | 2001-05-11 | 2001-05-11 | 圧電薄膜共振子 |
JPJP-P-2001-00141845 | 2001-05-11 | ||
JPJP-P-2001-00182194 | 2001-06-15 | ||
JP2001182194A JP3918464B2 (ja) | 2001-06-15 | 2001-06-15 | 薄膜音響共振器及びその製造方法 |
PCT/JP2002/004574 WO2002093549A1 (fr) | 2001-05-11 | 2002-05-10 | Resonateur acoustique a film mince et son procede de fabrication |
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CN100498931C (zh) | 2009-06-10 |
JP2005236337A (ja) | 2005-09-02 |
US6842088B2 (en) | 2005-01-11 |
US20020190814A1 (en) | 2002-12-19 |
KR20030092142A (ko) | 2003-12-03 |
CN101409536A (zh) | 2009-04-15 |
DE10296795T5 (de) | 2004-04-22 |
US20050093397A1 (en) | 2005-05-05 |
JP4345049B2 (ja) | 2009-10-14 |
CN1531721A (zh) | 2004-09-22 |
US7140084B2 (en) | 2006-11-28 |
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WO2002093549A1 (fr) | 2002-11-21 |
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