Enhancing Stability in Photo Imageable Dielectric Components
APR 3, 20269 MIN READ
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Photo Imageable Dielectric Technology Background and Stability Goals
Photo imageable dielectric (PID) technology emerged in the 1980s as a revolutionary approach to manufacturing multilayer printed circuit boards and advanced packaging substrates. This technology combines the properties of traditional dielectric materials with photolithographic processing capabilities, enabling direct patterning of dielectric layers without the need for separate masking and etching steps. The fundamental principle involves incorporating photosensitive compounds into dielectric formulations, allowing selective exposure and development to create precise geometric features.
The evolution of PID technology has been driven by the relentless miniaturization demands of the electronics industry. Early implementations focused on basic via formation and simple geometric patterns. However, as semiconductor packaging evolved toward higher density interconnects and finer pitch requirements, PID materials needed to accommodate increasingly complex three-dimensional structures while maintaining electrical and mechanical integrity.
Contemporary PID applications span multiple domains including high-density interconnect substrates, embedded component packaging, and advanced antenna structures. The technology has become particularly crucial in 5G communications, automotive electronics, and high-performance computing applications where signal integrity and thermal management are paramount. These applications demand exceptional dimensional stability across varying environmental conditions and extended operational lifespans.
Current stability challenges in PID components primarily stem from thermal cycling effects, moisture absorption, and chemical degradation mechanisms. Thermal expansion mismatches between PID layers and adjacent materials can induce mechanical stress, leading to delamination or crack propagation. Moisture ingress affects both dielectric properties and dimensional stability, while prolonged exposure to elevated temperatures can trigger polymer chain scission or crosslinking reactions that alter material characteristics.
The primary stability goals for next-generation PID technology encompass achieving coefficient of thermal expansion values below 15 ppm/°C, maintaining dielectric constant variations within ±2% across operational temperature ranges, and ensuring dimensional stability with less than 0.1% shrinkage over 1000 thermal cycles. Additionally, moisture absorption must be limited to below 0.2% by weight to prevent significant property degradation. These targets represent significant improvements over current commercial PID materials and require fundamental advances in polymer chemistry and processing methodologies.
The evolution of PID technology has been driven by the relentless miniaturization demands of the electronics industry. Early implementations focused on basic via formation and simple geometric patterns. However, as semiconductor packaging evolved toward higher density interconnects and finer pitch requirements, PID materials needed to accommodate increasingly complex three-dimensional structures while maintaining electrical and mechanical integrity.
Contemporary PID applications span multiple domains including high-density interconnect substrates, embedded component packaging, and advanced antenna structures. The technology has become particularly crucial in 5G communications, automotive electronics, and high-performance computing applications where signal integrity and thermal management are paramount. These applications demand exceptional dimensional stability across varying environmental conditions and extended operational lifespans.
Current stability challenges in PID components primarily stem from thermal cycling effects, moisture absorption, and chemical degradation mechanisms. Thermal expansion mismatches between PID layers and adjacent materials can induce mechanical stress, leading to delamination or crack propagation. Moisture ingress affects both dielectric properties and dimensional stability, while prolonged exposure to elevated temperatures can trigger polymer chain scission or crosslinking reactions that alter material characteristics.
The primary stability goals for next-generation PID technology encompass achieving coefficient of thermal expansion values below 15 ppm/°C, maintaining dielectric constant variations within ±2% across operational temperature ranges, and ensuring dimensional stability with less than 0.1% shrinkage over 1000 thermal cycles. Additionally, moisture absorption must be limited to below 0.2% by weight to prevent significant property degradation. These targets represent significant improvements over current commercial PID materials and require fundamental advances in polymer chemistry and processing methodologies.
Market Demand for Stable Photo Imageable Dielectric Solutions
The global electronics industry is experiencing unprecedented growth, driving substantial demand for advanced photo imageable dielectric materials that offer enhanced stability characteristics. This demand stems primarily from the miniaturization trends in consumer electronics, automotive electronics, and telecommunications infrastructure, where component reliability and performance consistency are paramount.
Semiconductor packaging applications represent the largest market segment for stable photo imageable dielectric solutions. Advanced packaging technologies such as fan-out wafer-level packaging, system-in-package, and 3D integration require dielectric materials that maintain dimensional stability under thermal cycling, resist moisture absorption, and provide consistent electrical properties throughout their operational lifetime. The increasing complexity of these packaging architectures necessitates materials with superior stability profiles.
The printed circuit board industry constitutes another significant demand driver, particularly in high-frequency applications where dielectric constant stability directly impacts signal integrity. 5G infrastructure deployment, automotive radar systems, and high-speed computing applications require photo imageable dielectrics that exhibit minimal property drift over extended periods and varying environmental conditions.
Automotive electronics present a rapidly expanding market opportunity, driven by electrification trends and autonomous driving technologies. These applications demand photo imageable dielectric materials capable of withstanding harsh operating environments while maintaining stable performance characteristics. Temperature cycling, vibration resistance, and long-term reliability requirements in automotive applications are significantly more stringent than traditional consumer electronics.
The aerospace and defense sectors represent specialized but high-value market segments where stability requirements are exceptionally demanding. Applications in satellite communications, radar systems, and avionics require photo imageable dielectric materials that demonstrate consistent performance across extreme temperature ranges and radiation exposure conditions.
Emerging applications in flexible electronics and wearable devices are creating new market opportunities for stable photo imageable dielectric solutions. These applications require materials that maintain their properties under mechanical stress and repeated flexing while providing reliable electrical insulation and dimensional stability.
Market growth is further accelerated by increasing regulatory requirements for product reliability and environmental compliance, pushing manufacturers to adopt more stable and predictable dielectric materials in their designs.
Semiconductor packaging applications represent the largest market segment for stable photo imageable dielectric solutions. Advanced packaging technologies such as fan-out wafer-level packaging, system-in-package, and 3D integration require dielectric materials that maintain dimensional stability under thermal cycling, resist moisture absorption, and provide consistent electrical properties throughout their operational lifetime. The increasing complexity of these packaging architectures necessitates materials with superior stability profiles.
The printed circuit board industry constitutes another significant demand driver, particularly in high-frequency applications where dielectric constant stability directly impacts signal integrity. 5G infrastructure deployment, automotive radar systems, and high-speed computing applications require photo imageable dielectrics that exhibit minimal property drift over extended periods and varying environmental conditions.
Automotive electronics present a rapidly expanding market opportunity, driven by electrification trends and autonomous driving technologies. These applications demand photo imageable dielectric materials capable of withstanding harsh operating environments while maintaining stable performance characteristics. Temperature cycling, vibration resistance, and long-term reliability requirements in automotive applications are significantly more stringent than traditional consumer electronics.
The aerospace and defense sectors represent specialized but high-value market segments where stability requirements are exceptionally demanding. Applications in satellite communications, radar systems, and avionics require photo imageable dielectric materials that demonstrate consistent performance across extreme temperature ranges and radiation exposure conditions.
Emerging applications in flexible electronics and wearable devices are creating new market opportunities for stable photo imageable dielectric solutions. These applications require materials that maintain their properties under mechanical stress and repeated flexing while providing reliable electrical insulation and dimensional stability.
Market growth is further accelerated by increasing regulatory requirements for product reliability and environmental compliance, pushing manufacturers to adopt more stable and predictable dielectric materials in their designs.
Current Stability Challenges in Photo Imageable Dielectrics
Photo imageable dielectric (PID) components face significant stability challenges that directly impact their performance and reliability in electronic applications. These materials, which combine photolithographic processability with dielectric functionality, encounter multiple degradation mechanisms that compromise their long-term operational integrity.
Thermal stability represents one of the most critical challenges in PID systems. During processing and operation, these materials experience temperature fluctuations that can induce dimensional changes, coefficient of thermal expansion mismatches, and polymer chain degradation. The photosensitive components within the dielectric matrix are particularly vulnerable to thermal stress, leading to crosslink density variations and potential delamination from substrate interfaces.
Chemical stability issues arise from the inherent reactivity of photoactive compounds embedded within the dielectric matrix. Residual photoinitiators and unreacted monomers can continue to undergo chemical reactions over time, altering the material's dielectric properties and mechanical characteristics. Exposure to moisture, oxygen, and other environmental contaminants accelerates these degradation processes, resulting in property drift and reduced component lifespan.
Electrical stability challenges manifest through dielectric constant variations, increased loss tangent values, and breakdown voltage degradation. The heterogeneous nature of PID materials, containing both organic and inorganic phases, creates interfaces that can accumulate charge and generate localized electric field concentrations. These phenomena contribute to premature electrical failure and inconsistent performance across different operating conditions.
Mechanical stability concerns include stress cracking, adhesion failure, and dimensional instability under cyclic loading conditions. The photolithographic processing requirements often result in residual stress within the cured dielectric, which can propagate as microcracks during thermal cycling or mechanical stress application. Interface adhesion between the PID layer and adjacent materials remains problematic due to differences in thermal expansion coefficients and chemical compatibility.
UV exposure stability presents unique challenges as these materials must maintain their properties despite potential continued photochemical reactions after initial processing. Prolonged exposure to ambient light can trigger additional crosslinking or polymer degradation, leading to embrittlement and property changes that affect circuit performance and reliability in long-term applications.
Thermal stability represents one of the most critical challenges in PID systems. During processing and operation, these materials experience temperature fluctuations that can induce dimensional changes, coefficient of thermal expansion mismatches, and polymer chain degradation. The photosensitive components within the dielectric matrix are particularly vulnerable to thermal stress, leading to crosslink density variations and potential delamination from substrate interfaces.
Chemical stability issues arise from the inherent reactivity of photoactive compounds embedded within the dielectric matrix. Residual photoinitiators and unreacted monomers can continue to undergo chemical reactions over time, altering the material's dielectric properties and mechanical characteristics. Exposure to moisture, oxygen, and other environmental contaminants accelerates these degradation processes, resulting in property drift and reduced component lifespan.
Electrical stability challenges manifest through dielectric constant variations, increased loss tangent values, and breakdown voltage degradation. The heterogeneous nature of PID materials, containing both organic and inorganic phases, creates interfaces that can accumulate charge and generate localized electric field concentrations. These phenomena contribute to premature electrical failure and inconsistent performance across different operating conditions.
Mechanical stability concerns include stress cracking, adhesion failure, and dimensional instability under cyclic loading conditions. The photolithographic processing requirements often result in residual stress within the cured dielectric, which can propagate as microcracks during thermal cycling or mechanical stress application. Interface adhesion between the PID layer and adjacent materials remains problematic due to differences in thermal expansion coefficients and chemical compatibility.
UV exposure stability presents unique challenges as these materials must maintain their properties despite potential continued photochemical reactions after initial processing. Prolonged exposure to ambient light can trigger additional crosslinking or polymer degradation, leading to embrittlement and property changes that affect circuit performance and reliability in long-term applications.
Current Stability Enhancement Solutions for PIDs
01 Use of photosensitive polymer compositions with enhanced thermal stability
Photo imageable dielectric materials can be formulated with photosensitive polymer compositions that exhibit improved thermal stability. These compositions typically include polymers with high glass transition temperatures and thermal decomposition resistance, which maintain their structural integrity during processing and operation. The incorporation of specific monomers and crosslinking agents helps to enhance the long-term stability of the dielectric components under elevated temperature conditions.- Use of photosensitive polymer compositions with enhanced thermal stability: Photo imageable dielectric materials can be formulated with photosensitive polymer compositions that exhibit improved thermal stability. These compositions typically include polymers with high glass transition temperatures and thermal decomposition temperatures, ensuring the dielectric components maintain their structural integrity during processing and operation. The incorporation of specific monomers and crosslinking agents helps achieve long-term stability under elevated temperature conditions.
- Incorporation of stabilizing additives and fillers: The stability of photo imageable dielectric components can be enhanced through the addition of stabilizing additives and inorganic fillers. These additives may include antioxidants, UV stabilizers, and thermal stabilizers that prevent degradation during exposure to light and heat. Inorganic fillers such as silica or alumina can improve mechanical strength and dimensional stability while reducing coefficient of thermal expansion mismatch.
- Optimization of photoinitiator systems for improved shelf life: Photo imageable dielectric formulations can achieve better stability through careful selection and optimization of photoinitiator systems. The use of photoinitiators with controlled reactivity and storage stability ensures that the dielectric materials maintain their imaging properties over extended periods. This approach involves balancing photosensitivity with storage stability to prevent premature crosslinking or degradation.
- Development of moisture-resistant formulations: Moisture resistance is critical for the stability of photo imageable dielectric components. Formulations can be designed with hydrophobic polymers and moisture barrier additives to minimize water absorption and prevent swelling or delamination. The use of specific resin systems and surface treatments helps maintain dielectric properties and adhesion under humid conditions, ensuring long-term reliability in various environmental conditions.
- Application of protective coatings and encapsulation techniques: The stability of photo imageable dielectric components can be further enhanced through the application of protective coatings or encapsulation layers. These protective layers shield the dielectric material from environmental factors such as oxygen, moisture, and contaminants that could cause degradation. Advanced encapsulation techniques using compatible materials help preserve the electrical and mechanical properties of the dielectric components throughout their service life.
02 Incorporation of inorganic fillers for dimensional stability
The addition of inorganic fillers to photo imageable dielectric compositions can significantly improve dimensional stability and reduce thermal expansion coefficients. These fillers help maintain the structural integrity of the dielectric components during thermal cycling and processing. The fillers also contribute to improved mechanical properties and resistance to warping or deformation over time.Expand Specific Solutions03 Optimization of photoinitiator systems for processing stability
Photo imageable dielectric materials can be formulated with optimized photoinitiator systems that provide consistent imaging performance and long-term stability. The selection of appropriate photoinitiators and their concentrations ensures reliable photopolymerization while maintaining storage stability of the unexposed material. These systems are designed to minimize degradation during storage and provide reproducible results during the imaging process.Expand Specific Solutions04 Use of adhesion promoters for interfacial stability
Adhesion promoters can be incorporated into photo imageable dielectric formulations to enhance the interfacial stability between the dielectric layer and substrate materials. These additives improve the bonding strength and prevent delamination during thermal stress and environmental exposure. The use of silane coupling agents and other adhesion-enhancing compounds ensures long-term reliability of the dielectric components in multilayer structures.Expand Specific Solutions05 Formulation with moisture resistance additives
Photo imageable dielectric compositions can be enhanced with moisture resistance additives to improve stability under humid conditions. These additives help prevent moisture absorption that can lead to dimensional changes, reduced dielectric properties, and decreased reliability. The incorporation of hydrophobic components and barrier materials ensures stable performance in various environmental conditions and extends the operational lifetime of the dielectric components.Expand Specific Solutions
Key Players in Photo Imageable Dielectric Industry
The photo imageable dielectric components industry is experiencing significant growth driven by increasing demand for advanced semiconductor packaging and display technologies. The market demonstrates strong expansion potential as companies like Sony Semiconductor Solutions, Samsung Electronics, and Taiwan Semiconductor Manufacturing Company lead technological advancement through substantial R&D investments. Technology maturity varies considerably across market segments, with established players such as Canon, Xerox Holdings, and Applied Materials offering mature solutions for traditional applications, while emerging companies like SMIC-Beijing and Huatian Technology focus on next-generation packaging technologies. The competitive landscape features a mix of Japanese giants including JSR Corp., Murata Manufacturing, and Sharp Corp. alongside Korean leaders Samsung Display and Samsung Electro-Mechanics, creating intense innovation pressure that accelerates stability enhancement developments across the sector.
JSR Corp.
Technical Solution: JSR Corporation develops advanced photoimageable dielectric materials with enhanced thermal stability and improved adhesion properties for semiconductor packaging applications. Their proprietary polymer chemistry incorporates thermally stable backbone structures and crosslinking agents that maintain dimensional stability during high-temperature processing. The company's dielectric formulations feature optimized filler systems and surface treatment technologies that enhance interfacial bonding with substrates, reducing delamination risks and improving long-term reliability in electronic components.
Strengths: Leading expertise in polymer chemistry and materials science, strong R&D capabilities in photoimageable materials. Weaknesses: Limited market presence compared to larger semiconductor material suppliers, dependency on specific market segments.
Dow Global Technologies LLC
Technical Solution: Dow Global Technologies focuses on developing silicone-based photoimageable dielectric systems with superior thermal cycling performance and moisture resistance. Their technology platform combines advanced siloxane chemistry with photoactive compounds to create materials that exhibit excellent dimensional stability across wide temperature ranges. The company's approach includes the development of hybrid organic-inorganic formulations that provide enhanced mechanical properties and reduced coefficient of thermal expansion, addressing key stability challenges in electronic packaging applications.
Strengths: Extensive materials science expertise, global manufacturing capabilities, strong chemical technology platform. Weaknesses: Broad focus across multiple industries may limit specialized development resources, longer development cycles for niche applications.
Core Patents in Photo Imageable Dielectric Stabilization
Negative-working imageable elements and methods of use
PatentInactiveEP2200826A1
Innovation
- A negative-working imageable element comprising a substrate with an imageable layer containing a radically polymerizable component, an initiator composition, an infrared radiation absorbing compound, a polymeric binder, and specific compounds represented by Structures (ST-I) and (ST-II), which allows for improved shelf life and image speed without the need for post-exposure baking or protective overcoats, and is developed on-press using a fountain solution or lithographic printing ink.
Photo-patternable dielectric materials curable to porous dielectric materials, formulations, precursors and methods of use thereof
PatentInactiveUS9006373B2
Innovation
- A photo-patternable dielectric formulation comprising silsesquioxane polymers, photoacid generators, and casting solvents is used to create a porous dielectric layer directly on a substrate through light exposure and curing, eliminating the need for photoresist and etching, and allowing for the formation of porous low-k dielectric materials.
Environmental Impact Assessment of PID Manufacturing
The manufacturing of Photo Imageable Dielectric (PID) components presents significant environmental considerations that require comprehensive assessment throughout the production lifecycle. The semiconductor industry's increasing focus on sustainability has elevated the importance of evaluating environmental impacts associated with PID manufacturing processes, particularly as demand for advanced electronic components continues to grow.
Chemical usage represents one of the most critical environmental aspects of PID manufacturing. The production process involves various photoresist materials, solvents, developers, and etching chemicals that can pose environmental risks if not properly managed. Volatile organic compounds (VOCs) released during coating, exposure, and development stages contribute to air quality concerns and require sophisticated emission control systems. Additionally, the disposal of spent chemicals and contaminated waste streams necessitates specialized treatment protocols to prevent soil and groundwater contamination.
Energy consumption patterns in PID manufacturing facilities significantly impact carbon footprint calculations. High-temperature curing processes, UV exposure systems, and cleanroom environmental controls demand substantial electrical power, often sourced from fossil fuel-based generation. The energy intensity of maintaining ultra-clean manufacturing environments, including HVAC systems and air filtration, contributes substantially to overall environmental impact. Advanced facilities are increasingly adopting renewable energy sources and implementing energy recovery systems to mitigate these effects.
Water resource utilization and wastewater management constitute another major environmental consideration. PID manufacturing requires ultra-pure water for cleaning and rinsing operations, placing demands on local water supplies and treatment infrastructure. Process wastewater contains various chemical residues that require extensive treatment before discharge, including heavy metals removal and pH neutralization. Water recycling systems and closed-loop processes are becoming standard practices to minimize freshwater consumption and reduce discharge volumes.
Waste generation and material efficiency present ongoing challenges for environmental sustainability. Manufacturing yields directly impact material waste, with defective components requiring proper disposal or recycling. Packaging materials, cleanroom consumables, and equipment maintenance waste contribute to solid waste streams. The industry is increasingly adopting circular economy principles, focusing on material recovery, component refurbishment, and sustainable packaging solutions to minimize landfill contributions and resource depletion.
Chemical usage represents one of the most critical environmental aspects of PID manufacturing. The production process involves various photoresist materials, solvents, developers, and etching chemicals that can pose environmental risks if not properly managed. Volatile organic compounds (VOCs) released during coating, exposure, and development stages contribute to air quality concerns and require sophisticated emission control systems. Additionally, the disposal of spent chemicals and contaminated waste streams necessitates specialized treatment protocols to prevent soil and groundwater contamination.
Energy consumption patterns in PID manufacturing facilities significantly impact carbon footprint calculations. High-temperature curing processes, UV exposure systems, and cleanroom environmental controls demand substantial electrical power, often sourced from fossil fuel-based generation. The energy intensity of maintaining ultra-clean manufacturing environments, including HVAC systems and air filtration, contributes substantially to overall environmental impact. Advanced facilities are increasingly adopting renewable energy sources and implementing energy recovery systems to mitigate these effects.
Water resource utilization and wastewater management constitute another major environmental consideration. PID manufacturing requires ultra-pure water for cleaning and rinsing operations, placing demands on local water supplies and treatment infrastructure. Process wastewater contains various chemical residues that require extensive treatment before discharge, including heavy metals removal and pH neutralization. Water recycling systems and closed-loop processes are becoming standard practices to minimize freshwater consumption and reduce discharge volumes.
Waste generation and material efficiency present ongoing challenges for environmental sustainability. Manufacturing yields directly impact material waste, with defective components requiring proper disposal or recycling. Packaging materials, cleanroom consumables, and equipment maintenance waste contribute to solid waste streams. The industry is increasingly adopting circular economy principles, focusing on material recovery, component refurbishment, and sustainable packaging solutions to minimize landfill contributions and resource depletion.
Quality Standards for Photo Imageable Dielectric Components
The establishment of comprehensive quality standards for photo imageable dielectric components represents a critical foundation for ensuring enhanced stability and reliability in advanced electronic applications. These standards encompass multiple dimensional aspects including material composition specifications, processing parameter controls, and performance validation protocols that collectively define the acceptable quality thresholds for manufacturing and deployment.
Material purity requirements constitute the primary tier of quality standards, mandating strict control over base resin formulations, photoinitiator concentrations, and additive compositions. Industry standards typically specify maximum allowable impurity levels below 10 ppm for critical contaminants, while establishing minimum molecular weight distributions for polymer matrices to ensure consistent cross-linking behavior during photolithographic processing.
Dimensional accuracy standards define precise tolerances for feature resolution, sidewall profiles, and thickness uniformity across substrate surfaces. Current specifications require feature resolution capabilities of 25 micrometers or finer, with sidewall angles maintained within ±5 degrees of vertical orientation. Thickness variation tolerances are typically constrained to ±10% across individual components and ±5% within localized measurement zones.
Electrical performance criteria establish mandatory benchmarks for dielectric constant stability, dissipation factor limits, and insulation resistance thresholds under various environmental conditions. Standards mandate dielectric constant variations below ±3% across operational temperature ranges from -40°C to +125°C, while requiring dissipation factors to remain below 0.02 at frequencies up to 10 GHz.
Environmental durability standards encompass thermal cycling resistance, moisture absorption limits, and chemical compatibility requirements. Components must demonstrate stable performance through 1000 thermal cycles between operational extremes, with moisture absorption coefficients below 0.5% by weight under standard atmospheric conditions.
Testing and validation protocols define standardized measurement methodologies, statistical sampling requirements, and certification procedures necessary for quality compliance verification. These protocols ensure consistent evaluation criteria across different manufacturing facilities and enable reliable performance prediction for end-use applications in demanding electronic systems.
Material purity requirements constitute the primary tier of quality standards, mandating strict control over base resin formulations, photoinitiator concentrations, and additive compositions. Industry standards typically specify maximum allowable impurity levels below 10 ppm for critical contaminants, while establishing minimum molecular weight distributions for polymer matrices to ensure consistent cross-linking behavior during photolithographic processing.
Dimensional accuracy standards define precise tolerances for feature resolution, sidewall profiles, and thickness uniformity across substrate surfaces. Current specifications require feature resolution capabilities of 25 micrometers or finer, with sidewall angles maintained within ±5 degrees of vertical orientation. Thickness variation tolerances are typically constrained to ±10% across individual components and ±5% within localized measurement zones.
Electrical performance criteria establish mandatory benchmarks for dielectric constant stability, dissipation factor limits, and insulation resistance thresholds under various environmental conditions. Standards mandate dielectric constant variations below ±3% across operational temperature ranges from -40°C to +125°C, while requiring dissipation factors to remain below 0.02 at frequencies up to 10 GHz.
Environmental durability standards encompass thermal cycling resistance, moisture absorption limits, and chemical compatibility requirements. Components must demonstrate stable performance through 1000 thermal cycles between operational extremes, with moisture absorption coefficients below 0.5% by weight under standard atmospheric conditions.
Testing and validation protocols define standardized measurement methodologies, statistical sampling requirements, and certification procedures necessary for quality compliance verification. These protocols ensure consistent evaluation criteria across different manufacturing facilities and enable reliable performance prediction for end-use applications in demanding electronic systems.
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