Optical Transceiver Reliability via ZnS Adhesion Layer
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Solution Overview
Problem
Conventional optical transceivers face challenges with miniaturization and reliability due to non-airtight sealing structures, which can lead to moisture absorption, electrode delamination, and short circuits between signal and ground electrodes.
Innovation Solution
An optical device with a non-airtight sealing structure that incorporates an insulating SiO2 layer covering the optical modulator chip, including a ZnS adhesion layer between the Au electrodes to prevent delamination and short circuits, ensuring reliable operation without airtight sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a non-airtight sealing structure is used to enable on-board mounting and miniaturization, then device complexity and size are reduced, but reliability deteriorates due to moisture absorption, electrode delamination, and short circuits
Solution Approach 1:
An adhesion layer made of TiN (titanium nitride) is introduced as an intermediary between the Au electrode and the SiO2 insulating layer. This TiN layer serves as a mediator that prevents direct contact between the electrode and insulator, eliminating the formation of conductive impurities at the interface while maintaining strong adhesion. The TiN layer acts as a protective barrier that ensures reliable electrical insulation without requiring airtight sealing, thus resolving the reliability issue in non-airtight structures.
Solution Approach 2:
The invention changes the material parameter of the adhesion layer from conventional Ti (titanium) to TiN (titanium nitride). This material substitution fundamentally alters the interface properties between the electrode and insulating layer. TiN provides superior adhesion strength and forms a stable, non-conductive interface that prevents moisture-induced delamination and short circuits, even in non-airtight environments. This parameter change enables the system to maintain high reliability without requiring airtight sealing.
2Reliability
If a thick SiO2 insulating layer is used to prevent short circuits, then reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The invention optimizes the SiO2 insulating layer thickness to a specific range of 1-10 μm. This parameter optimization balances dielectric strength requirements with manufacturing feasibility. Within this thickness range, the SiO2 layer provides sufficient insulation to prevent short circuits while remaining compatible with standard semiconductor fabrication processes. The specified thickness range ensures adequate electrical isolation without imposing excessive precision requirements on the manufacturing process.
Solution Approach 2:
The invention creates a composite layered structure consisting of Au electrode, TiN adhesion layer, and SiO2 insulating layer. This composite structure leverages the complementary properties of each material: Au provides electrical conductivity, TiN provides strong adhesion and interface stability, and SiO2 provides dielectric insulation. The synergistic combination of these materials achieves high reliability with moderate manufacturing precision requirements, as each layer performs its specific function optimally.
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 and maintains dielectric strength, ensuring reliable operation of the optical device even in non-airtight sealing conditions by using a ZnS adhesion layer and a thick SiO2 insulating layer, enhancing the reliability of on-board optical devices.
Implementation Method 1
an adhesion layer made of ZnS, which joins the Au electrode and the SiO2 insulating layer
Implementation Method 2
an insulating layer made of SiO2 that is formed on the ZnS adhesion layer... maintains dielectric strength
Data Source
AI summary
An optical device includes a substrate having an optical waveguide formed on a substrate surface, a buffer layer that is laminated on the optical waveguide, an electrode that is formed on the buffer layer, an insulating layer that covers the electrode, and an adhesion layer that is formed between the electrode and the insulating layer.