Receiver Module Trap Region and Barrier Metal for Solder Control
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Solution Overview
Problem
In receiver modules, the close proximity of electrodes in high-speed semiconductor light receiving elements increases the likelihood of short-circuits due to outflowing solder material, leading to operation failures and insufficient solder wetting areas, which existing technologies struggle to prevent effectively.
Innovation Solution
A receiver module design incorporating a trap region around the electrical wiring joining surfaces, made of a metal alloyed with solder, and a barrier metal to prevent direct contact between solder and electrical wirings, ensuring the solder is retained and preventing short-circuits and solder segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electrodes are placed close together in high-speed semiconductor light receiving elements, then response speed is improved, but the likelihood of short-circuit due to outflowing solder material increases
Solution Approach 1:
A barrier metal layer is introduced as an intermediary between the solder material and the electrical wiring. This barrier metal prevents direct contact and reaction between the solder and the electrical wiring, thereby preventing short-circuits while allowing the electrodes to remain in close proximity for high-speed operation.
Solution Approach 2:
The electrical wiring structure is segmented into multiple functional layers: the base electrical wiring, the barrier metal layer, and the solder portion. This segmentation allows each layer to perform its specific function - the barrier metal confines the solder material and prevents it from shorting adjacent electrodes, while maintaining the close spacing needed for high-speed response.
2Reliability
If barrier metal portions are formed on electrical wirings to prevent solder reaction, then solder wetting area is improved, but device complexity increases
Solution Approach 1:
The barrier metal layer serves multiple functions simultaneously: it acts as a reaction barrier between solder and electrical wiring, provides a controlled wetting surface for the solder, and helps confine the solder material within the intended joining area. This multi-functionality improves solder wetting without proportionally increasing device 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
The solution effectively prevents short-circuits between electrodes and ensures adequate solder wetting, maintaining module reliability and preventing solder ball generation, even with high-speed semiconductor light receiving elements.
Implementation Method 1
a trap region arranged around a joining surface of the electrical wiring, the trap region retaining solder by solder wetting
Implementation Method 2
when the solder material melts, the solder material reacts with the electrical wirings 306 to 308
Data Source
AI summary
Provided is a receiver module, including: a semiconductor light receiving element including an electrode; and a sub-mount including: an electrical wiring joined to the electrode with solder; and a trap region arranged around a joining surface of the electrical wiring, the trap region retaining solder by solder wetting.