EP1084285B1 - Perforierte silizium-membran, hergestellt mittels eines elektrochemischen ätzverfahrens - Google Patents
Perforierte silizium-membran, hergestellt mittels eines elektrochemischen ätzverfahrens Download PDFInfo
- Publication number
- EP1084285B1 EP1084285B1 EP99929077A EP99929077A EP1084285B1 EP 1084285 B1 EP1084285 B1 EP 1084285B1 EP 99929077 A EP99929077 A EP 99929077A EP 99929077 A EP99929077 A EP 99929077A EP 1084285 B1 EP1084285 B1 EP 1084285B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- area
- main surface
- pores
- mask layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/12—Etching of semiconducting materials
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
- Y10T428/24331—Composite web or sheet including nonapertured component
Definitions
- Perforated are used for various technical applications Workpieces, especially as inexpensive optical or mechanical Filters with pore diameters in the micrometer or submicron range needed.
- Such applications include isoporous membranes, backwashable filters, laminators, Catalyst carriers, reagent carriers, electrodes for batteries and fuel cells, nozzle plates, tubular grids or Filters for electromagnetic waves such as light or microwaves.
- a method for producing a perforated workpiece known, with the pore diameter in this area can be produced.
- a substrate wafer made of n-doped monocrystalline silicon through electrochemical etching holes formed perpendicular to the first surfaces, so that a structured Layer arises.
- the electrochemical etching takes place in a fluoride-containing electrolyte in which the substrate is connected as an anode.
- the process parameters are changed so that the Cross-section of the holes grows and the structured layer detached as a plate from which the workpiece is formed becomes.
- the invention is based on the problem of a perforated Specify workpiece and a method for its production, which has increased mechanical strength.
- the workpiece has a substrate made of silicon, in which a first area and a second area are provided. In In the first area, pores cross the substrate from one first main surface to a second main surface. In the first Area the workpiece is perforated. In a second Pores are provided starting from the first Main surface extend into the substrate that However, do not cross the substrate. This is below the Pores present in the second region of solid substrate material, which increases the stability of the perforated workpiece. As a result, the perforated workpiece is smaller Danger of destruction can be installed.
- the thickness of the substrate is in the direction of the depth of the pores preferably larger in the second area than in the first Area.
- first areas for use as a catalyst or reagent carrier define different filter ranges.
- the second area in a ring shape and the first Arrange area within the second area.
- the solid border in the second area acts as Frame for the perforated workpiece.
- the perforated workpiece is used electrochemical etching.
- This will be done in a first main surface of a substrate made of silicon by electrochemical Etching creates pores whose depth is less than is the thickness of the substrate.
- the mask layer is in the area of the second Main area structured so that the second main area is exposed in the first area.
- a structured mask layer as an etching mask becomes the substrate then in the area of the exposed second main area etched at least to the bottom of the pores. Then will the mask layer is removed so that those arranged in the first region Pores the substrate from the first major surface to cross the second main area.
- the mask layer is preferably formed from Si 3 N 4 or SiO 2 .
- Etching the substrate to form the continuous pores in the first area preferably with KOH.
- This results in for the second area in the area of the second Main area is an edge area with a surface with a ⁇ 111> orientation.
- the electrochemical etching is preferably carried out in one fluoride-containing, acidic electrolytes, the substrate being Anode of an electrolysis cell is connected. Since that If the substrate is connected as an anode, minority charge carriers move in the silicon to that with the electrolyte in Contact the first main area. One forms there Space charge zone. Because the field strength in the area of depressions is always larger in a surface than outside it, the minority charge carriers move preferentially such wells, with statistical distribution in each Surface are present. This leads to a Structuring the first main area. The deeper one is initially small unevenness due to the etching, the more minority carriers move because of the enlarged Field strength there and the stronger the etching attack this place. The holes grow in the substrate in the crystallographic ⁇ 100> direction.
- the diameter of the holes is preferably 2 ⁇ m.
- a substrate 1 made of n-doped, single-crystal silicon a resistivity of 5 ohm cm is at a first Main surface 2 provided with a surface topology.
- the surface topology includes those arranged at regular intervals Wells made using photolithographic Process steps produced by an alkaline etching become.
- the surface topology can be light-induced, electrochemical etching are formed.
- the first main surface 2 of the substrate 1 is covered with a fluoride-containing acidic electrolytes brought into contact.
- the Electrolyte has a hydrofluoric acid concentration of 2 to 10 percent by weight, preferably 5 percent by weight.
- the electrolyte an oxidizing agent, for example hydrogen superoxide, added to the development of hydrogen bubbles on the first main surface 2 of the substrate 1 suppress.
- the substrate 1 is connected as an anode.
- a voltage of 1.5 to 5 volts, preferably 3 volts, is applied between the substrate 1 and the electrolyte.
- the substrate 1 is illuminated from a second main surface 3, which lies opposite the first main surface 2, so that a current density of 10 mA per cm 2 is set.
- pores 4 are generated during the electrochemical etching and run perpendicular to the first main surface 2 (see FIG. 1). After an etching time of 4.5 hours, the pores 4 reach a depth of 300 ⁇ m, measured from the first main surface 2 in the direction of the pore depth, and a diameter of 2 ⁇ m. The distance between adjacent pores 4 is 4 ⁇ m.
- a mask layer 5 made of silicon nitride is formed by CVD deposition formed in a thickness of 100 nm.
- the mask layer 5 covers both the first main surface 2 and the second The main surface 3 and the surface of the pores 4.
- the mask layer 5 is structured in the area of the second main surface 3 with the aid of a photolithographically generated mask (not shown) and a plasma etching using CF 4 , O 2 (see FIG. 2). This defines first areas 6 and second areas 7.
- the second main surface 3 is exposed in the first regions 6. In the second regions 7, the second main surface 3 is still covered by the mask layer 5.
- the first main surface 2 and the surface of the pores 4 are also completely covered by the mask layer 5.
- etching with KOH at a concentration of 50 percent by weight is then the substrate 1 at least until etched to the bottom of the pores 4.
- the substrate 1 is etched measured to a depth from the second main surface 3 of 350 ⁇ m with a substrate thickness of 625 ⁇ m. This will in the first areas 6 in the area of the bottom of the pores 4 the surface of the mask layer 5 is exposed (see figure 3).
- the etching attack takes place along preferred crystallographic directions, so that on the edge of the second regions 7 form edge regions 71 which form a surface with ⁇ 111> orientation.
- first areas 6 has continuous pores 4 (see Figure 4).
- the first Area 6 is adjacent to the second areas 7, in which the pores do not cross the substrate 1.
- the second Areas 7 give the perforated workpiece stability.
- the first areas 6 have 6 different shapes (see supervision in Figure 5).
- the first areas 6 can large area, for example rectangular or square, with a variety of pores, elongated with a series of pores or be square with only one pore.
- the first area 6 is due to the etching with KOH for exposure the bottoms of the pores 4 in the first area 6 of the Edge area 71 of one of the second areas 7 surround.
- the geometrical The shape of the second regions 7 corresponds to that Stability requirements selected. It corresponds in particular Webs, a grid, individual windows, one Scoring frame or identification features.
- the mask layer 5 can be formed from SiO 2 by thermal oxidation.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Weting (AREA)
- Micromachines (AREA)
Description
- Figur 1
- zeigt einen Schnitt durch ein Substrat, das von einer ersten Hauptfläche ausgehende Poren aufweist.
- Figur 2
- zeigt den Schnitt durch das Substrat nach Strukturierung einer Maskenschicht zur Definition von ersten Bereichen und zweiten Bereichen.
- Figur 3
- zeigt den Schnitt durch das Substrat nach Ätzung des Substrates bis zum Boden der Poren.
- Figur 4
- zeigt den Schnitt durch das Substrat nach Entfernen der Maskenschicht.
- Figur 5
- zeigt eine Aufsicht auf das in Figur 4 dargestellte Werkstück. Der in Figur 4 dargestellte Schnitt ist in Figur 5 mit IV-IV bezeichnet.
Claims (9)
- Perforiertes Werkstück,bei dem ein Substrat (1) aus Silizium, das einen ersten Bereich (6) und einen zweiten Bereich (7) aufweist, vorgesehen ist,bei dem in dem ersten Bereich (6) Poren (4) vorgesehen sind, die das Substrat (1) von einer ersten Hauptfläche (2) zu einer zweiten Hauptfläche (3) durchqueren,bei dem in dem zweiten Bereich (7) Poren vorgesehen sind, die sich ausgehend von der ersten Hauptfläche (2) in das Substrat (1) hinein erstrecken, das Substrat (1) jedoch nicht durchqueren.
- Werkstück nach Anspruch 1,
bei dem der zweite Bereich (7) im Bereich der zweiten Hauptfläche (3) einen Randbereich (71) mit einer Oberfläche mit <111>-Orientierung aufweist. - Werkstück nach Anspruch 1 oder 2,bei dem die Tiefe der Poren (4) im ersten Bereich (6) und im zweiten Bereich (7) im wesentlichen gleich ist,bei dem das Substrat (1) in dem zweiten Bereich (7) in Richtung der Porentiefe dicker ist als in dem ersten Bereich (6).
- Verfahren zur Herstellung eines perforierten Werkstücks,bei dem in einer ersten Hauptfläche (2) eines Substrats (1) aus Silizium durch elektrochemisches Ätzen Poren (4) erzeugt werden, deren Tiefe geringer als die Dicke des Substrats (1) ist,bei dem die erste Hauptfläche (2), die Oberfläche der Poren (4) und eine der ersten Hauptfläche (2) gegenüberliegende zweite Hauptfläche (3) mit einer Maskenschicht (5) versehen wird,bei dem die Maskenschicht (5) im Bereich der zweiten Hauptfläche (3) so strukturiert wird, daß die zweite Hauptfläche (3) in einem ersten Bereich (6) freigelegt wird,bei dem unter Verwendung der strukturierten Maskenschicht als Ätzmaske das Substrat (1) mindestens bis zum Boden der Poren (4) geätzt wird,bei dem die Maskenschicht (5) entfernt wird, so daß die im ersten Bereich (6) angeordneten Poren (4) das Substrat (1) von der ersten Hauptfläche (2) zur zweiten Hauptfläche (3) durchqueren.
- Verfahren nach Anspruch 4,
bei dem die Maskenschicht (5) aus Si3N4 gebildet wird. - Verfahren nach Anspruch 4 oder 5,
bei dem das Ätzen des Substrats (1) mit KOH erfolgt. - Verfahren nach einem der Ansprüche 4 bis 6,
bei dem die elektrochemische Ätzung in einem fluoridhaltigen, sauren Elektrolyten erfolgt, wobei das Substrat als Anode einer Elektrolysierzelle verschaltet ist. - Verfahren nach Anspruch 7,bei dem ein fluroidhaltiger, saurer Elektrolyt verwendet wird mit einer Konzentration zwischen 2 Gewichtsprozent Flußsäure und 10 Gewichtsprozent Flußsäure,bei dem beim elektrochemischen Ätzen eine Spannung zwischen 1,5 Volt und 3 Volt angelegt wird.
- Verfahren nach einem der Ansprüche 4 bis 8,
bei dem die zweite Hauptfläche (3) des Substrats (1) beim elektrochemischen Ätzen zur Einstellung der Stromdichte im Substrat (1) beleuchtet wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19820756 | 1998-05-08 | ||
DE19820756A DE19820756C1 (de) | 1998-05-08 | 1998-05-08 | Perforiertes Werkstück und Verfahren zu dessen Herstellung |
PCT/DE1999/001292 WO1999058746A1 (de) | 1998-05-08 | 1999-05-03 | Perforiertes silizium-membran hergestellt mittels eines elektrochemischen ätverfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1084285A1 EP1084285A1 (de) | 2001-03-21 |
EP1084285B1 true EP1084285B1 (de) | 2003-08-06 |
Family
ID=7867190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99929077A Expired - Lifetime EP1084285B1 (de) | 1998-05-08 | 1999-05-03 | Perforierte silizium-membran, hergestellt mittels eines elektrochemischen ätzverfahrens |
Country Status (7)
Country | Link |
---|---|
US (1) | US6558770B1 (de) |
EP (1) | EP1084285B1 (de) |
JP (1) | JP2002514689A (de) |
KR (1) | KR20010052320A (de) |
DE (2) | DE19820756C1 (de) |
TW (1) | TW552322B (de) |
WO (1) | WO1999058746A1 (de) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1232533A2 (de) * | 1999-11-17 | 2002-08-21 | Neah Power Systems, Inc. | Brennstoffzelle mit siliziumsubstraten und/oder durch sol-gel verfahren hergestellte trägerkörper |
US6720105B2 (en) * | 1999-11-17 | 2004-04-13 | Neah Power Systems, Inc. | Metallic blocking layers integrally associated with fuel cell electrode structures and fuel cell electrode stack assemblies |
US6924058B2 (en) * | 1999-11-17 | 2005-08-02 | Leroy J. Ohlsen | Hydrodynamic transport and flow channel passageways associated with fuel cell electrode structures and fuel cell electrode stack assemblies |
US6808840B2 (en) * | 1999-11-17 | 2004-10-26 | Neah Power Systems, Inc. | Silicon-based fuel cell electrode structures and fuel cell electrode stack assemblies |
DE10052007C1 (de) * | 2000-10-20 | 2002-03-07 | Infineon Technologies Ag | Halbleiterbauelement mit durchgehenden Kompensationszonen |
DE10122839B4 (de) * | 2001-05-11 | 2007-11-29 | Qimonda Ag | Verfahren zum Vereinzeln von Halbleiterstrukturen sowie zum Vereinzeln vorbereitetes Halbleitersubstrat |
EP1258937A1 (de) * | 2001-05-17 | 2002-11-20 | STMicroelectronics S.r.l. | Mikro-Silizium-Brennstoffzelle, Verfahren zur Herstellung und autonome Halbleitervorrichtung mit Mikro-Brennstoffzelle |
KR100451132B1 (ko) * | 2001-11-08 | 2004-10-02 | 홍석인 | 다공성 실리콘을 이용한 효소고정화 전극 제작 방법 |
CN100349314C (zh) * | 2002-01-03 | 2007-11-14 | 尼电源系统公司 | 其上具有共形导电层的多孔燃料电池电极结构 |
DE10217569A1 (de) * | 2002-04-19 | 2003-11-13 | Infineon Technologies Ag | Vorrichtung auf Basis von partiell oxidiertem porösen Silizium |
MD2449G2 (ro) * | 2003-03-14 | 2004-11-30 | Ион ТИГИНЯНУ | Procedeu de obţinere a membranelor perforate ultrasubţiri |
DE10318995B4 (de) * | 2003-04-25 | 2006-04-20 | Christian-Albrechts-Universität Zu Kiel | Verfahren zur Herstellung von durchgängigen Membranen |
DE10362083B4 (de) * | 2003-04-25 | 2007-05-03 | Christian-Albrechts-Universität Zu Kiel | Verfahren zur Herstellung von Membranen mit durchgängigen Poren |
US7081158B2 (en) * | 2003-11-21 | 2006-07-25 | Imaje S.A. | Ink composition for continuous deflected jet printing, especially on letters and postal articles |
DE102005010080B4 (de) * | 2005-03-03 | 2008-04-03 | Qimonda Ag | Verfahren zum Herstellen einer Dünnschicht-Struktur |
ITVA20050034A1 (it) * | 2005-05-13 | 2006-11-14 | St Microelectronics Srl | Celle a combustibile realizzate in un singolo strato di silicio monocristallino e processo di fabbricazione |
US7615161B2 (en) * | 2005-08-19 | 2009-11-10 | General Electric Company | Simplified way to manufacture a low cost cast type collimator assembly |
EP1798799B1 (de) * | 2005-12-16 | 2008-09-24 | STMicroelectronics S.r.l. | Brennstoffzelle flächig integriert auf einem monokristallinen Silikonschaltkreis und Verfahren zur Herstellung |
KR100731549B1 (ko) * | 2006-07-21 | 2007-06-22 | 이노필터 주식회사 | 다공성 복합 세라믹 분리막 제조방법과, 이에 의해 제조된다공성 복합 세라믹 분리막 |
JP4562801B2 (ja) * | 2007-05-09 | 2010-10-13 | 株式会社カンタム14 | シリコン基材の加工方法および加工装置 |
TWI464108B (zh) * | 2012-01-17 | 2014-12-11 | Nat Univ Kaohsiung | The preparation of porous silicon nanowires and the prepared porous silicon nanowires |
TWI500825B (zh) * | 2013-05-02 | 2015-09-21 | Nat Univ Tsing Hua | V-vi族半導體之奈米片狀陣列結構之製備方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4044222A (en) * | 1976-01-16 | 1977-08-23 | Western Electric Company, Inc. | Method of forming tapered apertures in thin films with an energy beam |
US4570173A (en) * | 1981-05-26 | 1986-02-11 | General Electric Company | High-aspect-ratio hollow diffused regions in a semiconductor body |
US5139624A (en) * | 1990-12-06 | 1992-08-18 | Sri International | Method for making porous semiconductor membranes |
DE4202454C1 (de) * | 1992-01-29 | 1993-07-29 | Siemens Ag, 8000 Muenchen, De | |
EP0630058A3 (de) * | 1993-05-19 | 1995-03-15 | Siemens Ag | Verfahren zur Herstellung einer Pyrodetektoranordnung durch elektronisches Ätzen eines Silizium Substrats. |
DE4426507C2 (de) * | 1994-07-27 | 2001-04-26 | Inst Chemo Biosensorik | Sensoren auf der Basis von Mikrostrukturen |
US5997713A (en) * | 1997-05-08 | 1999-12-07 | Nanosciences Corporation | Silicon etching process for making microchannel plates |
-
1998
- 1998-05-08 DE DE19820756A patent/DE19820756C1/de not_active Expired - Fee Related
-
1999
- 1999-04-21 TW TW088106375A patent/TW552322B/zh not_active IP Right Cessation
- 1999-05-03 WO PCT/DE1999/001292 patent/WO1999058746A1/de active IP Right Grant
- 1999-05-03 EP EP99929077A patent/EP1084285B1/de not_active Expired - Lifetime
- 1999-05-03 KR KR1020007012422A patent/KR20010052320A/ko active IP Right Grant
- 1999-05-03 JP JP2000548533A patent/JP2002514689A/ja not_active Withdrawn
- 1999-05-03 DE DE59906526T patent/DE59906526D1/de not_active Expired - Lifetime
-
2000
- 2000-11-08 US US09/708,277 patent/US6558770B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO1999058746A1 (de) | 1999-11-18 |
KR20010052320A (ko) | 2001-06-25 |
DE59906526D1 (de) | 2003-09-11 |
US6558770B1 (en) | 2003-05-06 |
JP2002514689A (ja) | 2002-05-21 |
DE19820756C1 (de) | 1999-11-11 |
EP1084285A1 (de) | 2001-03-21 |
TW552322B (en) | 2003-09-11 |
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