Optoelectronic Semiconductor Contact Element for Pixel Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optoelectronic semiconductor components face challenges in achieving high contrast ratios between adjacent image points or pixels, primarily due to optical cross-talk, which affects the brightness and clarity of individual pixels.
Innovation Solution
The semiconductor component incorporates a semiconductor layer sequence with a recess filled by a contact element that includes a transparent intermediate layer, a metallic mirror layer, and an injection element, where the injection element and mirror layer have different material compositions, optimizing reflectivity and electrical properties to enhance pixel contrast and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional contact element structure is used, then the manufacturing process is simple, but the contrast ratio between adjacent pixels is poor due to optical cross-talk
Solution Approach 1:
The contact element is segmented into three distinct functional layers: a first intermediate layer (transparent dielectric), a metallic mirror layer, and an injection element. This segmentation allows each layer to perform its specific function independently, with the mirror layer reflecting light to suppress cross-talk and the intermediate layer providing electrical isolation, thereby improving pixel contrast ratio.
Solution Approach 2:
The contact element structure implements local quality by positioning the metallic mirror layer specifically at the bottom of the recess to reflect light locally, while the transparent intermediate layer is applied to the side walls to provide electrical isolation. This localized functional differentiation suppresses optical cross-talk in the recess region without affecting adjacent pixels, improving contrast ratio.
2Manufacturing precision
If the injection element and mirror layer have the same material composition, then the manufacturing process is simpler, but the reflectivity and electrical properties are not optimized
Solution Approach 1:
The injection element and mirror layer use different material compositions to optimize their respective functions. The mirror layer uses highly reflective materials (such as aluminum or silver) specifically for light reflection, while the injection element uses materials optimized for electrical injection. This material differentiation improves reflectivity and electrical properties without requiring complex manufacturing processes.
Solution Approach 2:
The contact element is constructed as a composite structure combining different materials: the transparent intermediate layer (dielectric material), the metallic mirror layer (highly reflective metal), and the injection element (conductive material). This composite material approach allows optimization of both reflectivity and electrical properties through material selection rather than manufacturing complexity.
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
This configuration significantly improves the contrast ratio between pixels by suppressing optical cross-talk and allowing for independent control of each image point, resulting in enhanced brightness and clarity of individual pixels.
Implementation Method 1
a metallic first mirror layer (21)... The first mirror layer has, for example, silver, aluminum or rhodium or consists thereof
Implementation Method 2
The first intermediate layer is in particular transparent for radiation emitted by the active layer
Implementation Method 3
the injection element is applied to a bottom surface of the recess directly adjoining the first layer... Via the first contact element, for example, first charge carriers are injected through the recess into the first layer
Data Source
AI summary
An optoelectronic semiconductor component and a method for producing an optoelectronic semiconductor component are disclosed. In an embodiment, a component includes a semiconductor layer sequence including a first main side, a first layer, an active layer, a second layer and a second main side, a first contact element arranged on the second main side filling a recess in the semiconductor layer sequence, wherein the recess extends from the second main side through the second layer and the active layer and opens out into the first layer and a second contact element arranged on the second main side, the second contact element being arranged laterally next to the recess in a plan view of the second main side, wherein the first contact element comprises a first transparent intermediate layer, a metallic first mirror layer and a metallic injection element.