Challenges for Embedded Device Technologies for Package Level Integration
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1 Challenges for Embedded Device Technologies for Package Level Integration Kevin Cannon, Steve Riches Tribus-D Ltd Guangbin Dou, Andrew Holmes Imperial College London Embedded Die Technology IMAPS-UK/NMI Conference 22 September 2016
2 Scope of Presentation Overview of Tribus-D Ltd and Imperial College London Challenges for Embedded Die Technology Advanced Package Types Technical Components Commercial Technology Trends Can Embedded Die Technology be Applied to Custom Products? Embedded Die at Package Level Laser Generated Ultrasound Micro-welding Techniques Process Developments Required Concluding Remarks
3 Overview of Tribus-D and Imperial College London Tribus-D Ltd Imperial College London Experience in wide range of packaging technologies Interest in developing versatile packaging solutions Support of R&D activities in Universities 20-year track record in MEMS and Nanotechnology, including assembly and packaging technologies Applications in sensing/instrumentation, energy harvesting/storage and nano-electronics
4 Advanced Package Types QFN Quad Flat No-Lead Courtesy of Digikey WLCSP (Fan In) Wafer Scale Chip Scale Package Courtesy of Digikey FOWLP (Fan Out) Wafer Level Package Courtesy of Electroiq
5 Advanced Package Types Flip Chip Courtesy of Dow 2.5D and 3D IC Courtesy of Indium Corp Embedded Die Technology Courtesy of Fraunhofer IZM
6 Advanced Package Types Package Types Miniaturisation Increased Performance Increased Functionality Established Applications Quantities QFN X X X RF packaging Low to High Fan-In (WLCSP) X X Analog/Mixed Signal Automotive Radars Fan-Out (FOWLP) X Wireless Power Flip-Chip X Mobile Consumer 2.5D/3D IC CMOS Image Memories/GPUs Embedded Die Power Sensors High High Med to High High Low to High Ref: Beica R et al The Growth of Advanced Packaging: An Overview of the Latest Technology Developments, Applications and Market Trends IMAPS 2015 Orlando, October 2015, pp 1-5
7 Technical Challenges for Embedded Die Technology Miniaturisation Bond pad bumping Laser drilled via/cu plating fill Connection to bond pad Die thinning Thermal density Multi-level structures (crosstalk) Reliability/lifetime Thermally conductive voltage isolation Electro-magnetic effects (radiated/susceptibility) End of Life recycling Image: Andreas Ostmann, Fraunhofer IZM
8 Component Challenges for Embedded Die Technology Compatible metallisation systems on devices, components and substrates Encapsulants and substrates with dielectric and thermal properties Flexibility to accommodate different devices types and ratings Incorporation of driver and control electronics Image: Lars Boettcher et Al, Fraunhofer IZM Ref: Embedding of Chips for System in Package Realisation Technology and Application
9 Commercial Challenges for Embedded Die Technology Economies of scale Low volume vs high volume Established supply chain In-house manufacture vs sub-contract Standard vs customised product Investment required Level of integration Low power vs high power Availability of bare die Minimum order quantities Yield Obsolescence Cost modelling Patent issues Typical FOWLP Process Flow Source: Palesko A Using Cost Modelling to Make Better Design Decisions Chip Scale Review, September-October 2015, pp37-40
10 Technology Trends - Structural In-Mould Electronics Printed Circuit Building Block Courtesy of Tactotek TM Proximity Sensor/Lightstrip Courtesy of Tactotek TM
11 Technology Trends - 3D Printed Electronics Conformal Printed Antenna Courtesy of Optomec 3D Printed LED and Resistor Courtesy of Voxel 8
12 Can Embedded Die Technology be Applied to Custom Products? Assumptions: Use standard SM PCB assembly techniques Embedding at package level Use sinter/plated material to provide interconnection Proposed Assembly Route: Deposition of sinter/plated material Preparation of devices for attachment Attachment of devices to sinter/plated material Encapsulation of devices Back lamination Lift-off from carrier Singulation into devices Solder placement and reflow Embedded Die and Components at Package Level
13 Assembly Process Steps Assembly Step Materials Processes 1. Deposition of sinter/plated material onto carrier Sinter/plated material onto carrier plate Screen printing/dispense of sinter material and sintering Plating of Cu or Ag 2. Preparation of devices for attachment Cu pillars Al metallisation bond pads Supplied from foundry Cu stud bumping, Cu plating 3. Attachment of devices to sinter material Cu studs to sinter/plated material LGU (*) + pressure + heat Thermosonic bonding 4. Encapsulation of devices High thermal conductivity encapsulant Moulding 3D Printing 5. Back lamination Cu or Al sheet Conductive adhesive or sinter Screen printing or film lamination and curing 6. Lift-off from carrier Mechanical removal 7. Singulation into devices Wafer sawing Laser cutting 8. Solder Placement and Reflow Sn-Ag-Cu alloy HT solder Other Screen printing and reflow Solder jet deposition Solder ball placement
14 Laser-Ultrasonic Micro-Welding Process Use of pulsed laser to generate ultrasound close to individual bonding site Stress transients produced by confined laser ablation of sacrificial layer between bond head and workpiece Allows localised control of bonding parameters - may facilitate scaling of ultrasonic flip-chip attachment to larger chip sizes Demonstrated for Cu-Ag bonding on high-temp substrates Potentially also applicable to temperature-sensitive materials because of localised, transient heating Needs to be scaled to manufacturable process See: Dou G., Gower M.C., Holmes A.S., Micro-welding using laser-generated ultrasound, Proc. ESTC 2016, Grenoble, France, September 2016
15 Laser-Ultrasonic Micro-Welding Process R&D bonder with windows in sample platform and bond head to allow illumination from above and below Two laser sources: upper: 20 W max average power, 1064 nm wavelength nanosecond pulsed laser for u/s generation lower: 30 W, 970 nm wavelength laser diode for pre-heating workpiece Initial work with sacrificial layer comprising 75µm-thick W (tungsten) with overlying glass layer. W acts as IR absorber; ablation occurs mainly in glass Bonding demonstrated for Au-Au and Cu-Ag systems
16 Cu-Ag bonding by Laser-Ultrasonic Technique Flip-chip attachment of Cu-bumped silicon dies to hightemperature substrates with sintered Ag metallisation Individual bump shear tests showed average shear strengths of ~116 MPa for bumps transferred to Ag layer FIB-SEM analysis indicated solid-state micro-welds with clear bonding line d) Images: a) bumps on chip before bonding; b) chip surface after de-bonding; c) bumps transferred to Ag layer on substrate; d) FIB-SEM image
17 Process Developments Required Assembly Step Development Required Comments 1. Deposition of sinter material onto carrier 2. Preparation of devices for attachment 3. Attachment of devices to sinter material Optimisation of carrier and coating Copper stud bumping or Cu plating Scalable manufacturable process for Cu bump to Ag or Cu sinter Techniques for rapid alignment and assembly 4. Encapsulation of devices 3D printing of moulding compound or thermoplastic 5. Back lamination High thermal conductivity assembly to encapsulant/thermoplastic and devices 6. Lift Off from carrier Mechanical removal Rapid prototyping using polymers Adhesion encapsulant or thermoplastic to Cu or Al conductor Rapid prototyping through late customisation 7. Singulation into devices Sawing/laser cutting 8. Solder Placement and Reflow Reliability of SAC solder alloy to Ag sinter joints
18 Concluding Remarks Widespread investment is taking place to develop embedded die technologies at the package level and printed circuit board level, some of which have reached production maturity Other technologies such as structural in-mould and 3D printing are advancing into the electronics arena There is scope for applying embedded die technology for custom products at the package level, but developments are required to prepare devices for attachment and demonstrate technical and economic benefits Imperial College are investigating novel micro-welding techniques to provide interconnections for temperature sensitive applications
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