Semiconductor Chip Reflective Surface Layout for Better Light Coupling
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Solution Overview
Problem
Existing radiation-emitting semiconductor chips lack improved radiation characteristics, particularly in terms of efficiency and stability, which limits their performance in emitting near-ultraviolet, visible, and near-infrared radiation.
Innovation Solution
A radiation-emitting semiconductor chip design featuring a semiconductor layer sequence with spaced active regions, a reflective outer surface, and an electrically insulating region, along with a carrier for mechanical stabilization, enhances radiation characteristics by improving reflectivity and heat dissipation, and includes an anti-reflective coating for efficient light coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reflective outer surface is added to improve light coupling efficiency, then radiation characteristics are improved, but device complexity increases
Solution Approach 1:
A reflective outer surface is introduced as an intermediary element between the active regions and the external environment. This reflective surface redirects light that would otherwise be lost, coupling it back into the extraction path. The surface acts as a mediator that transforms the radiation pattern without fundamentally changing the semiconductor structure itself.
Solution Approach 2:
The reflective outer surface utilizes the vertical dimension above the semiconductor chip to improve lateral light coupling. By reflecting light downward at specific angles, the system exploits the third dimension (vertical space) to enhance two-dimensional planar light extraction, effectively using z-axis geometry to improve x-y plane performance.
2Productivity
If multiple active regions are spaced apart to improve radiation characteristics, then light coupling efficiency increases, but device area increases
Solution Approach 1:
The semiconductor chip is segmented into multiple spatially separated active regions rather than using a single continuous active area. This segmentation allows each region to be optimally positioned with reflective surfaces, improving individual region light coupling. The gaps between segments enable independent optimization of each active region's radiation characteristics.
Solution Approach 2:
Multiple active regions are arranged in a vertical stack configuration rather than spreading them out laterally. This vertical stacking in the z-dimension allows multiple radiation-generating regions to occupy a smaller footprint area while maintaining improved light coupling through the reflective outer surface that interacts with light from all regions.
3Productivity
If an electrically insulating region is introduced to space active regions, then radiation characteristics improve, but manufacturing complexity increases
Solution Approach 1:
An electrically insulating region is introduced as a mediator between adjacent active regions. This insulating layer provides both electrical isolation to prevent current leakage and mechanical spacing to define the radiation pattern. The material layer acts as an intermediary that simultaneously addresses electrical and optical requirements without requiring complex processing.
Solution Approach 2:
The electrically insulating region serves multiple functions simultaneously: it provides electrical isolation between active regions, defines the spacing for optimal radiation characteristics, and can also serve as a structural support layer. This multi-functionality reduces the need for additional separate components or processing steps.
4Reliability
If a carrier is added for mechanical stabilization, then device reliability improves, but device complexity increases
Solution Approach 1:
The device is segmented into two functional parts: the semiconductor chip containing active regions and the separate carrier for mechanical support. This segmentation allows the chip to be optimized for radiation generation while the carrier is optimized for mechanical stability and heat dissipation. The carrier can be a standard substrate that the chip is mounted on, reducing the need for integrated mechanical structures.
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 design significantly improves light coupling efficiency and radiation characteristics, increasing brightness and luminous flux while reducing thermal load, enabling enhanced performance in emitting electromagnetic radiation.
Implementation Method 1
at least one reflective outer surface arranged laterally of each active region... configured to reflect a portion of the radiation from the active regions
Implementation Method 2
an anti-reflective coating arranged on the semiconductor layer sequence in the electrically insulating region
Implementation Method 3
The carrier can be formed of a potting... For example, the potting is a metal... Advantageously, the heat dissipation of the semiconductor chip can be improved by means of the metallic potting
Data Source
AI summary
The invention relates to a radiation-emitting semiconductor chip comprising a semiconductor layer sequence having at least two active regions which generate electromagnetic radiation during operation and at least one reflective outer surface which is arranged to the side of each active region wherein the reflective outer surface includes an angle of at least 35° and at most 55° with a main extension plane of the semiconductor chip. The invention also relates to a method for producing a radiation-emitting semiconductor chip.