Optoelectronic Device Diode Trench Metallization
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Solution Overview
Problem
The existing manufacturing methods for optoelectronic devices with gallium nitride light-emitting diodes face challenges in accurately aligning control circuits and LED arrays, particularly at high pixel densities, which hinders resolution and pixel integration density improvements.
Innovation Solution
The method involves transferring an active diode stack with doped semiconductor layers onto a control circuit with metal pads, forming trenches to delimit individual diodes, depositing insulating layers, and metallizing the trenches to create separate connections, allowing for improved alignment accuracy and efficient electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If control circuit and LED array are separately manufactured and then hybridized by stacking, then device assembly is simplified, but alignment accuracy deteriorates making it difficult to achieve high resolution and pixel integration density
Solution Approach 1:
The invention segments the device into two separately manufactured components: a control circuit substrate and an active LED stack. This allows each component to be manufactured independently with optimized processes, then assembled together. The segmentation enables simplified manufacturing while maintaining high alignment accuracy through the use of registration marks and precise positioning features during assembly.
2Manufacturing precision
If pitch between pixels is decreased to increase resolution, then pixel integration density is improved, but alignment difficulty increases making effective positioning more challenging
Solution Approach 1:
The invention incorporates preliminary alignment features during the manufacturing process, including registration marks formed on both the control circuit substrate and the active LED stack before assembly. These pre-formed features guide the alignment process during hybridization, making it easier to achieve precise positioning even when pixel pitch is reduced to increase integration density.
3Manufacturing precision
If alignment accuracy is increased to achieve high resolution, then manufacturing complexity increases, but this approach is obsolete according to the new method
Solution Approach 1:
The invention inverts the traditional approach by forming the active LED stack as a continuous layer first, then using patterning and trench formation to define individual LED regions after assembly. This reverse methodology eliminates the need for high-precision alignment during the critical LED definition step, as the active stack is already positioned on the control circuit substrate with inherent alignment features.
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 approach reduces alignment constraints during assembly, enhances the accuracy of diode positioning, and facilitates the formation of high-resolution optoelectronic devices with improved electrical and optical performance.
Implementation Method 1
depositing an insulating layer on the lateral walls of the trenches
Implementation Method 2
forming a metallization coating the lateral walls and the bottom of the trenches and contacting the sides of the portions of the first semiconductor layer
Data Source
AI summary
A method of manufacturing an optoelectronic device, including: a) transferring, onto a surface of a control circuit, a diode stack including first and second semiconductor layers of opposite conductivity types, so that the second layer is electrically connected to metal pads of the control circuit; b) forming in the active stack trenches delimiting a plurality of diodes connected to separate metal pads of the control circuit; c) depositing an insulating layer on the lateral walls of the trenches; d) partially removing the insulating layer to expose the sides of the portions of the first layer delimited by the trenches; and e) forming a metallization coating the lateral walls and the bottom of the trenches and contacting the sides of the portions of the first layer delimited by the trenches.