3D IC Photonic Interconnects for Bandwidth

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Solution Overview

Problem

The semiconductor industry faces challenges in achieving high integration density and efficient data transmission in three-dimensional integrated circuits (3DICs) due to complex metal routings and limited bandwidth, particularly in integrating optical active components and photonic interconnections.

Innovation Solution

The implementation of hybrid bonding and photonic interconnection layers using dielectric materials between IC chips, allowing for direct light transmission and eliminating RC delay, thereby enhancing bandwidth and reducing power consumption without the need for an interposer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If metal routings are used for interconnects between stacked chips, then electrical connection is achieved, but bandwidth is limited and RC delay occurs

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidbandwidth

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent replaces metal-based electrical interconnects with optical interconnects using waveguides. Light signals transmit data between stacked chips through dielectric waveguide structures, eliminating the RC delay inherent in metal routings and enabling higher bandwidth communication without the resistive and capacitive limitations of traditional electrical connections.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the transmission medium from electrical signals in metal to optical signals in dielectric waveguides. This parameter change fundamentally alters the transmission characteristics, removing RC delay constraints and enabling higher frequency operation and bandwidth for inter-chip communication in 3DIC structures.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If optical active components are integrated into 3DIC, then bandwidth and data rate increase, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvedata rateVSAvoidstructure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges optical active components (lasers, modulators, detectors) directly with the semiconductor chips in a monolithic integration approach. The waveguide structures are formed as integral parts of the chip layers, combining optical and electronic functions within the same device structure rather than using separate optical modules, thereby reducing overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The dielectric waveguide structures serve multiple functions: they act as optical transmission paths, provide mechanical support, enable electrical isolation between layers, and facilitate heat dissipation. This multi-functionality reduces the need for additional specialized components and simplifies the overall device architecture despite the advanced functionality provided.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If traditional packaging is used, then manufacturing is simpler, but integration density and interconnect length are limited

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidintegration density

Core Design Contradiction:

Ease of manufactureVSVolume of moving object

Solution Approach 1:

The patent transitions from two-dimensional planar integration to three-dimensional stacked architecture with vertical interconnects. Multiple chips are stacked vertically and interconnected through through-silicon vias and waveguides, enabling significantly higher integration density by utilizing the vertical dimension while maintaining manufacturing processes adapted from traditional semiconductor fabrication.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 increases data rate and bandwidth in 3DICs by integrating optical active components and enabling optical communication with high bandwidth, low power consumption, and reduced costs, while simplifying the structure by eliminating complex metal routings.

Implementation Method 1

allowing for direct light transmission and eliminating RC delay, thereby enhancing bandwidth

Methodology Applied

Scientific EffectLight transmission: Light

Data Source

PatentUS9899355B2Three-dimensional integrated circuit structure

Publication Date: 2018.02.20 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

Provided is a 3DIC structure including first and second IC chips and connectors. The first IC chip includes a first metallization structure, a first optical active component, and a first photonic interconnection layer. The second IC chip includes a second metallization structure, a second optical active component, and a second photonic interconnection layer. The first and second IC chips are bonded via the first and second photonic interconnection layers. The first optical active component is between the first photonic interconnection layer and the first metallization structure. The first optical active component and the first metallization structure are bonded to each other. The second optical active component is between the second photonic interconnection layer and the second metallization structure. The second optical active component and the second metallization structure are bonded to each other.