Reflective Layer Boundary Element Semiconductor Chip
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Solution Overview
Problem
Components with semiconductor chips face challenges in achieving high reflectance for electromagnetic radiation due to material limitations, particularly with housing materials needing mechanical strength and silver layers prone to corrosion, leading to decreased reflectance over time.
Innovation Solution
A component design featuring a housing with a reflective layer that is electrically insulating, where the reflective layer covers the side walls and bottom surface of the cavity, and a boundary element prevents the reflective material from reaching the semiconductor chip, using a matrix material with white particles like TiO2 for enhanced reflectance and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a silver layer is applied to the bottom surface of the cavity to increase reflectance, then the reflectance is improved, but the layer corrodes easily and reflectance decreases rapidly over time
Solution Approach 1:
The patent replaces the expensive and unreliable silver layer with a reflective layer made from inexpensive, corrosion-resistant materials such as titanium dioxide (TiO2) or barium sulfate (BaSO4) particles embedded in a housing material. This allows the use of durable, maintenance-free reflective surfaces that do not corrode over time, effectively substituting a 'short-living' silver layer with long-lasting alternative materials.
Solution Approach 2:
The patent employs composite materials by embedding reflective particles (TiO2, BaSO4, ZnO, Al2O3, or ZrO2) within a housing material matrix (epoxy, silicone, or polyurethane). This composite structure combines the high reflectance properties of the particles with the mechanical strength and corrosion resistance of the matrix, achieving both high reflectance and long-term reliability without using silver.
2Illumination intensity
If the housing material contains reflective particles to increase reflectance, then the reflectance is improved, but the mechanical strength and other material requirements cannot be fully met
Solution Approach 1:
The patent resolves this contradiction by creating a composite housing material where reflective particles (TiO2, BaSO4, ZnO, Al2O3, or ZrO2) are embedded within a structurally sound matrix material such as epoxy, silicone, or polyurethane. The matrix provides the necessary mechanical strength, tensile strength, and compressive strength, while the dispersed particles provide high reflectance. This composite approach allows both requirements to be satisfied simultaneously.
Solution Approach 2:
The patent applies local quality by concentrating the reflective particles in specific regions where reflectance is needed (such as the bottom surface and side walls of the cavity), while the housing material maintains its overall structural integrity. The reflective particles are distributed to achieve high reflectance locally without compromising the global mechanical properties of the housing structure.
3Illumination intensity
If the reflective layer covers the entire base body including the mounting surface, then the reflectance is maximized, but the semiconductor chip cannot be properly mounted or electrical contact is prevented
Solution Approach 1:
The patent segments the base body surface into two distinct zones: a mounting surface area that remains uncovered by the reflective layer to allow semiconductor chip attachment and electrical contact, and a reflective area covering the bottom surface and side walls of the cavity to maximize reflectance. This segmentation is achieved by applying the reflective layer only to specific regions, ensuring both functional requirements are met without interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively increases reflectance by several percentage points, maintains reflectance over time, and prevents corrosion, ensuring efficient coupling of electromagnetic radiation from semiconductor chips without absorption or reflection losses.
Implementation Method 1
the electromagnetic radiation generated by the semiconductor chip can be absorbed at side walls of the cavity. In order to increase the reflectance of the side walls
Implementation Method 2
the housing can be made of a material containing reflective or scattering particles embedded therein
Data Source
AI summary
A component having a boundary element is disclosed. In an embodiment a component comprises a semiconductor chip, a housing and a reflective layer, wherein the housing has a shaped body and a base body, the shaped body laterally enclosing the base body at least in places and being different from the reflective layer. In a plan view, the base body has a free area which is uncovered by the shaped body. The free area or a bottom surface of a cavity comprises a mounting surface for the semiconductor chip, wherein the semiconductor chip is arranged on the mounting surface. The bottom surface or the free area is partially covered by the reflective layer, wherein the mounting surface is enclosed at least in regions by a boundary element which adjoins the reflective layer and is configured to prevent the semiconductor chip from being covered by the reflective layer.