Spring-Loaded Semiconductor Cleaving for Smoother Fracture Surfaces

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Solution Overview

Problem

Conventional cleave systems for semiconductor structures often result in undesirable surface roughness and inconsistent cleave pull force, leading to roughness patterns and hillocks during epitaxial growth.

Innovation Solution

A cleave system that utilizes stored spring energy to separate semiconductor structures, featuring a cleave arm that moves to a raised position to compress spring members, which then release energy to initiate and propagate the cleave process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If conventional cleave systems use motor-driven cleave arms with suction cups under vacuum, then the cleave process can be automated and controlled, but the surface roughness increases and cleave arcs form due to inconsistent pull force

Engineering Contradiction:

Improveautomation of cleave processVSAvoidsurface roughness

Core Design Contradiction:

Extent of automationVSManufacturing precision

Solution Approach 1:

The patent replaces the motor-driven mechanical system with a spring-driven mechanical system. The spring member stores mechanical energy and releases it to provide consistent cleave pull force, eliminating the variability introduced by motor control while maintaining automation through the spring's automatic energy release mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the force delivery parameter from variable (motor-controlled) to constant (spring-loaded). The spring member is pre-loaded to provide a consistent cleave force throughout the cleave process, which eliminates the inconsistent pull force that causes cleave arcs and improves surface roughness.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If motor-driven cleave arms are used to apply tension to the semiconductor structure, then the cleave process can be controlled, but inconsistent cleave pull force causes formation of surface roughness cleave arcs

Engineering Contradiction:

Improvecontrol of cleave processVSAvoidcleave uniformity

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent substitutes the motor-driven control system with a spring-driven system. The spring member automatically provides consistent cleave force without requiring complex motor control, simplifying operation while improving cleave uniformity through the spring's inherent mechanical consistency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The spring member is pre-loaded and automatically releases its stored energy to provide consistent cleave force throughout the process. This self-service mechanism eliminates the need for external motor control and ensures uniform cleave pull force without requiring complex control systems.

Inventive Principle:

Principle #25Self-service

3Productivity

If higher tension is applied to the semiconductor structure during cleave, then the cleave propagation speed increases, but surface roughness increases and hillocks form during epitaxial growth

Engineering Contradiction:

Improvecleave propagation speedVSAvoidsurface roughness

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent optimizes the tension parameter by using a pre-loaded spring member that provides consistent, optimized tension throughout the cleave process. This maintains adequate cleave propagation speed while preventing excessive tension that would cause surface roughness and hillock formation.

Inventive Principle:

Principle #35Parameter changes

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 system achieves improved surface roughness characteristics and consistent cleave propagation, reducing surface roughness and cleave arcs, and enhancing the quality of the cleaved semiconductor structure.

Implementation Method 1

A spring member applies a cleave force to the semiconductor structure when the cleave arm is in the raised position

Methodology Applied

Scientific EffectSpring energy storage and release: Spring

Implementation Method 2

A motor raises the cleave arm to a raised position. A spring member applies a cleave force to the semiconductor structure when the cleave arm is in the raised position

Methodology Applied

Scientific EffectMechanical energy transformation: Mechanical Accumulator

Implementation Method 3

A suction member grasps the semiconductor structure on a top surface of the semiconductor structure

Methodology Applied

Scientific EffectVacuum suction: Vacuum

Implementation Method 4

Conventional cleave systems use suction cups that are under vacuum to grasp the top and bottom surfaces of the structure to be cleaved

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Data Source

PatentUS12334369B2Cleave systems having spring members for cleaving a semiconductor structure and methods for cleaving such structures

Publication Date: 2025.06.17 GLOBALWAFERS CO LTD

AI summary

Cleave systems for cleaving a semiconductor structure are disclosed. The cleave systems may include a cleave arm that is moveable from a starting position to a raised position in which a cleave stress is applied to the semiconductor structure. Spring members store energy as the cleave arm is raised with the stored spring energy causing the structure to cleave into two pieces upon initiation of the cleave across the structure.