MEMS Sensors: From Automotive. CE Applications. MicroNanoTec Forum Innovations for Industry April 19 th Hannover, Germany

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1 MEMS Sensors: From Automotive to CE Applications MicroNanoTec Forum Innovations for Industry 2010 April 19 th Hannover, Germany Oliver Schatz, CTO 1 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

2 MEMS Sensors: From Automotive to Consumer Electronic Applications Introduction Overview technologies Function principle and applications of MEMS sensors Future trends and applications in Consumer Electronics Outlook and summary 2 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

3 MEMS Sensor Market RF MEMS Microfluidics Micromirror/-display Gyroscope Accelerometer Microphone Pressure sensor Inkjet head Source: Yole Dévelopement Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

4 Challenges of MEMS (1/2) Dedicated processes and equipment HF vapor etch DRIE Source: Semitool Source: Tegal Processes with contamination risks to ICs Source: EVG Anodic wafer bonding 1 mm Anisotropic etching (KOH) Combined design and control of mechanical and electrical parameters 20 µm Frequency Damping Sensitivity Capacitance 4 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

5 Challenges of MEMS (2/2) Controlling the influence of mechanical stress in the package Testing of physical parameters Robustness and media compatibility (e.g. for pressure or flow sensors) air mass sensor pressure sensor 5 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

6 Market drivers for MEMS sensors Automotive applications 1. high functional requirements (high accuracy, self test, advanced safety concepts) 2. high reliability/quality (15 years, < 1 ppm, extreme environmental conditions) 3. low price (< 3 EUR) Consumer applications 1. small size (~ 3 x 3 x 0,9 mm³) 2. ultra-low power consumption ( 200 µa) 3. low price (< 1 EUR) 6 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

7 MEMS Sensors: From Automotive to Consumer Electronic Applications Introduction Overview technologies Function principle and applications of MEMS sensors Future trends and applications in Consumer Electronics Outlook and summary 7 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

8 Two fundamental ways doing micromachining Volume Micromachining Building structures through wafer etching Structures from mono-crystalline silicon Sensor size reduction limited Surface Micromachining Structures generated by applying different layers of polysilicon Good alignment with standardized semiconductor processes Sensor size can be reduced significantly 1 mm 20 µm Surface Micromachining opens up a new world for sensors. 8 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

9 Bosch-team wins German Future Prize of the Federal President 2008 Smart Sensors for Consumer Electronics, Industrial and Medical Technologies 9 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

10 Surface micromachining the key Surface micromachining: Bosch-team develops five new key technologies for series-production. Growth of extremely thick layers of polysilicon High-precision and fast deep etching - Bosch process Gas phase etching for release of the structures Encapsulation for hermetical sealing APSM process exact vacuum cavities in silicon Sensors fulfill requirements of consumer electronics Sensors considerably smaller and less expensive Sensors with less power consumption Automotive electronics Consumer electronics 10 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

11 Surface Micromachining Surface micromachining: Bosch-team develops five new key technologies for series-production Growth of extremely thick layers of polysilicon. 11 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

12 Five Key processes (1/5) Growth of extremely thick layers of polysilicon. Epi-Poly Epi-Poly Oxide Silicon Oxide Silicon Thickness of structures tailor-made. 12 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

13 Surface Micromachining Surface micromachining: Bosch-team develops five new key technologies for series-production Growth of extremely thick layers of polysilicon. High-precision and fast deep etching ( Bosch process ). 13 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

14 Five key processes (2/5) High-precision and fast deep etching ( Bosch process ). The base process of surface micromachining worldwide 14 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

15 DRIE The BOSCH process Deep RIE of silicon trenches Licensed to many companies worldwide European Inventor of the Year 2007 Andrea Urban and Dr. Franz Lärmer 15 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

16 DRIE the BOSCH process Deep RIE of silicon trenches Alternating etch- (SF 6 ) and passivation cycles (C 4 F 8 ) High aspect ratio ( >>10:1 ) High anisotropy (underetch <<2 % of etch depth) High etch rate 16 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

17 Surface Micromachining Surface micromachining: Bosch-team develops five new key technologies for series-production Growth of extremely thick layers of polysilicon. High-precision and fast deep etching ( Bosch process ). Gas phase etching for release of the structures. 17 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

18 Five Key Processes (3/5) Gas phase etching for release of the structures. With this process the structures become movable. 18 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

19 Surface Micromachining Surface micromachining: Bosch-team develops five new key technologies for series-production Growth of extremely thick layers of polysilicon. High-precision and fast deep etching ( Bosch process ). Gas phase etching for release of the structures. Encapsulation for hermetical sealing. 19 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

20 Five Key Processes (4/5) Encapsulation for hermetical sealing cap acceleration sensor 20 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

21 Surface Micromachining Surface micromachining: Bosch-team develops five new key technologies for series-production Growth of extremely thick layers of polysilicon. High-precision and fast deep etching ( Bosch process ). Gas phase etching for release of the structures. Encapsulation for hermetical sealing. APSM process exact vacuum cavities in silicon. 21 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

22 Five Key Processes (5/5) APSM process exact vacuum cavities in silicon cavity The core of ASPM process is porous silicon 22 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

23 APSM technology advantages New surface micromachining technique Reduced size: bond frames not necessary Fabrication of monocrystalline Si membranes Full flexibility with size and shape of the membrane CMOS compatible process High synergy between MEMS and ASIC No process media that are difficult for a CMOS fab Fully integrated process flow in a CMOS wafer fab Integrated pressure sensor 23 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

24 Surface Micromachining Surface micromachining: Bosch-team develops five new key technologies for series-production Growth of extremely thick layers of polysilicon. High-precision and fast deep etching ( Bosch process ). Gas phase etching for release of the structures. Encapsulation for hermetical sealing. APSM process exact vacuum cavities in silicon. 24 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

25 MEMS Sensors: From Automotive to Consumer Electronic Applications Introduction Overview technologies Function principle and applications of MEMS sensors Future trends and applications in Consumer Electronics Outlook and summary 25 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

26 Movable structures to measure acceleration and tilt Acceleration sensor 26 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

27 MEMS sensors automotive applications Airbag Systems Acceleration sensors for occupant protection Engine Management Pressure sensors for engine management Vehicle Dynamics Control (VDC) Acceleration and angular rate sensors for VDC Driver Information Angular rate sensor for navigation systems 27 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

28 Movable structures to measure angular velocity 28 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

29 Movable structures to measure pressure membrane 30 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

30 Pressure sensors for automotive and CE applications new (APSM) old (KOH) Automobile applications Consumer electronics applications e.g. Motor management Highest accuracy over temperature and lifetime Integrated, single chip solution stable single-crystalline membrane Diagnosis capability Small SMD package e.g. Altitude measurement High absolute accuracy Extremely high precision Very small, robust LCC8 ceramic package Ultra-low current consumption Digital I2C interface 31 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

31 MEMS Sensors: From Automotive to Consumer Electronic Applications Introduction Overview technologies Function principle and applications of MEMS sensors Future trends and applications in Consumer Electronics Outlook and summary 32 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

32 Surface Micromachining the key for versatile new applications Sensors considerably smaller Sensors with much less power consumption Sensors less expensive Sensors fulfil the requirements of consumer electronics 33 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

33 Evolution of requirements (1/2) Packages of acceleration sensors PLCC28 (Automotive) 1996 SOIC16w (Automotive) 2002 SOIC14n (Automotive) x4 LGA (CE) x3 QFN (CE) x2 LGA (CE) Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

34 Evolution of requirements (2/2) Packages acceleration sensors 140 Package footprint (mm²) Automotive CE Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

35 MEMS sensors the senses for mobile devices Mobile phones, PDAs Intuitive menu input through motion and position change Gaming and toys New gaming experience through motion interaction Mobile computing Data protection by free-fall detection Sports and fitness Monitoring through step-counting and altimetry 36 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

36 Use cases for MEMS sensors in mobile phones User Interface Tap control Gaming input Menu navigation Position Detection Upside down Portrait / landscape Pedestrian navigation Speed & distance estimation Altitude detection Location based services Motion Detection Step counting Activity monitoring Power management 37 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

37 MEMS Sensors: From Automotive to Consumer Electronic Applications Introduction Overview technologies Function principle and applications of MEMS sensors Future trends and applications in Consumer Electronics Outlook and summary 38 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

38 Bosch leading the market in MEMS sensors Sales (M$) Foundry 0 ROBERT BOSCH STMICROELECTRONICS FREESCALE DENSO ANALOG DEVICES INFINEON (incl.sensonor) SENSATA PANASONIC SCHNEIDER ELECTRIC KNOWLES ACOUSTICS Source: isupply estimation, 2008 revenues for TOP50 MEMS suppliers, shown here: TOP10 MEMS sensor suppliers 39 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

39 1 billion MEMS sensors produced* 1000 Accumulated production volume (mio.) *Bosch total MEMS production (automotive and consumer) 40 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

40 Future of MEMS New applications are arising MEMS autofocus Energy Harvester Source: Siimpel Source: IMEC Micro Fuel Cell Micromirror for microprojection systems Source: STM, CEA Source: Microvision 41 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

41 Forum "Innovations for Industry" Summary Automotive MEMS is main driver for sensor development Permanent enhancements of MEMS technology enables miniaturization of components and new functions Continuous development of new device generations Consumer electronics MEMS is enabling technology for new functions in CE Key factors: size, power consumption, price In future large variety of new applications in many areas 42 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

42 Thank you for your attention! 43 Engineering April 2010 GmbH All rights reserved, also regarding any disposal, exploitation, reproduction, editing,

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