Semiconductor Optical Device Dummy Electrodes Suction Stability
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Solution Overview
Problem
Miniaturization of semiconductor optical devices has led to suction failure issues due to reduced flat regions, making it difficult for suction devices to securely hold them, especially as the size of the devices becomes smaller than the suction port, resulting in potential tilting and air leakage.
Innovation Solution
The semiconductor optical device incorporates a mesa stripe with an electrode film, an electrode pad portion, and strategically placed dummy electrodes that are electrically insulated from the electrode film, increasing the flat surface area and preventing suction failure by distributing the suction force effectively across the device's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the semiconductor optical device is miniaturized to achieve high-speed response and high integration, then the device size and electrode size are reduced, but the flat region area becomes smaller causing suction failure
Solution Approach 1:
The flat region is segmented into multiple functional areas: the electrode pad portion for electrical connection and dummy electrode portions for suction support. This segmentation allows the electrode size to be reduced for high-speed response while the dummy electrodes provide additional flat surfaces for reliable suction holding.
Solution Approach 2:
Dummy electrodes are introduced as intermediary elements between the reduced-size electrode and the suction device. These dummy electrodes serve as mediators that provide the necessary flat surface area for suction without interfering with the electrical function of the electrode pad.
2Speed
If the electrode size is reduced for high-speed response, then the response time is improved, but the suction device cannot securely hold the device due to insufficient flat region
Solution Approach 1:
The upper surface is divided into functionally distinct regions: the electrode pad portion for electrical connection and dummy electrode portions dedicated to suction support. This ensures that the reduced electrode size does not compromise suction reliability.
Solution Approach 2:
The dummy electrodes serve multiple purposes: they provide flat surfaces for suction device attachment, maintain the overall device structure, and do not interfere with the electrical function of the electrode pad. This multi-functionality resolves the conflict between miniaturization and suction reliability.
3Productivity
If the device size is smaller than the suction port, then integration density is improved, but tilting and air leakage occur during suction
Solution Approach 1:
Different regions of the device upper surface are given different qualities: the electrode pad portion has electrical conductivity for signal transmission, while the dummy electrode portions provide flat, stable surfaces for suction attachment. This local differentiation allows the device to maintain stability during suction despite its small overall size.
4Reliability
If dummy electrodes are added to increase flat surface area, then suction failure is prevented, but device complexity increases
Solution Approach 1:
The dummy electrodes are formed using the same conductive layer and patterning process as the electrode pad, merging the formation steps into a single manufacturing flow. This reduces the added complexity despite the increased functional elements.
Solution Approach 2:
The dummy electrodes, while adding structural elements, serve the universal function of providing flat surfaces for suction without requiring additional manufacturing processes or complex interconnections, thus minimizing the increase in device complexity.
Data Source
AI summary
A semiconductor optical device includes an element structure layer that includes a mesa stripe extending in a first direction; an electrode film that covers at least an upper surface of the mesa stripe; an electrode pad portion that covers a part of a first region positioned in a second direction, intersecting the first direction, relative to the mesa stripe on an upper surface of the element structure layer and is electrically connected to the electrode film; a first dummy electrode that covers another part of the first region and is electrically insulated from the electrode film; and a second dummy electrode that covers at least a part of a second region positioned in a third direction, opposite to the second direction, relative to the mesa stripe on the upper surface of the element structure layer and is electrically insulated from the electrode film, wherein the first dummy electrode includes a first portion disposed in the first direction relative to the electrode pad portion and a second portion disposed in a fourth direction, opposite to the first direction, relative to the electrode pad portion.