Flip-Chip Semiconductor Structure for Current Crowding Relief
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Solution Overview
Problem
Semiconductor devices used for lighting in vehicles face reliability issues due to current crowding and degraded light extraction and electrical characteristics, particularly in flip-chip structures with conductive semiconductor layers and electrodes.
Innovation Solution
A semiconductor device design featuring a substrate with a bonding layer, an electrode layer, and a semiconductor structure comprising a first and second conductive semiconductor layer with an active layer in between, where the second conductive semiconductor layer includes a through-hole for the second electrode, enhancing current spreading and light extraction efficiency, and incorporating a reflective layer and capping layer for improved thermal and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flip-chip structure is applied to semiconductor devices for vehicle lighting, then reliability issues due to wires are reduced, but light extraction efficiency and electrical characteristics are degraded due to current crowding
Solution Approach 1:
The patent segments the semiconductor layer into multiple conductive semiconductor layers with different conductivity types (n-type and p-type). This segmentation allows for better current distribution by creating multiple current paths, thereby reducing current crowding effects while maintaining the flip-chip structure's reliability advantages.
Solution Approach 2:
The patent applies local quality by creating regions with different electrical properties within the semiconductor structure. Specifically, it uses conductive semiconductor layers with different conductivity types in specific locations to optimize current distribution and reduce current crowding in critical areas, thereby improving light extraction efficiency without compromising overall reliability.
2Reliability
If conductive semiconductor layers and electrodes are used in flip-chip structure, then electrical connection is achieved, but current crowding occurs in adjacent regions degrading electrical characteristics
Solution Approach 1:
The semiconductor structure is divided into multiple conductive semiconductor layers (first conductive semiconductor layer and second conductive semiconductor layer) with alternating conductivity types. This segmentation creates distributed current paths that prevent current crowding by spreading the current flow across multiple layers and regions, thereby improving electrical characteristics.
Solution Approach 2:
The patent transitions from a two-dimensional current flow in a single layer to a three-dimensional current distribution across multiple stacked conductive semiconductor layers. This dimensional change allows current to flow through multiple paths in the vertical direction, effectively reducing current density and preventing current crowding in any single region.
3Ease of manufacture
If conventional semiconductor structure is used, then manufacturing is simple, but heat dissipation efficiency is insufficient
Solution Approach 1:
The semiconductor structure is segmented into multiple conductive semiconductor layers with alternating conductivity types (n-type and p-type). This segmentation creates multiple interfaces and pathways for heat dissipation, improving thermal management efficiency while maintaining manufacturing feasibility through standard layer-by-layer fabrication processes.
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 improves heat dissipation, light extraction efficiency, and ohmic contact, reducing current crowding and enhancing the reliability and efficiency of semiconductor devices for red light emission.
Implementation Method 1
an active layer disposed between the first conductive semiconductor layer and the second conductive semiconductor layer
Implementation Method 2
incorporating a reflective layer and capping layer for improved thermal and optical performance
Implementation Method 3
A semiconductor device design featuring a substrate with a bonding layer, an electrode layer, and a semiconductor structure... improving heat dissipation
Data Source
AI summary
An embodiment provides a semiconductor device comprising: a substrate; a bonding layer disposed on the substrate; an electrode layer disposed on the bonding layer; a semiconductor structure disposed on the electrode layer and including a first conductive semiconductor layer, a second conductive semiconductor layer, and an active layer disposed between the first conductive semiconductor layer and the second conductive semiconductor layer; a first electrode electrically connected to the first conductive semiconductor layer; and a second electrode electrically connected to the second conductive semiconductor layer, wherein the second conductive semiconductor layer includes a through-hole, and the second electrode is disposed in the through-hole so as to be electrically connected to the electrode layer.