Semiconductor Showerhead Concentric Slot Design

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Solution Overview

Problem

In semiconductor processing, achieving consistent and optimal processing gas flow and uniformity is challenging due to issues like clogged showerhead holes and parasitic precursor reactions, which affect the heating and gas distribution in reaction chambers.

Innovation Solution

The design of a showerhead with a body having multiple concentrically aligned slots and gas flow cavities, including a purge channel, ensures separate and controlled flow paths for gases, preventing premature interaction and ensuring uniform gas distribution and efficient purging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional showerhead designs with holes are used, then gas distribution is simple, but the holes become clogged and parasitic precursor reactions occur

Engineering Contradiction:

Improvegas flow consistencyVSAvoidclogging and parasitic reactions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The showerhead is divided into multiple plates (first plate, second plate, third plate) with slots at different levels, creating segmented gas flow paths that prevent clogging and parasitic reactions by distributing gas through multiple separated channels rather than single holes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first plate with slots acts as an intermediary element between the gas source and the second plate, creating a staged gas distribution system where gas flows through multiple intermediate slots before reaching the substrate, preventing direct contact and parasitic reactions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If multiple gas flow paths are created with separate plates, then gas flow uniformity and control are improved, but device complexity increases

Engineering Contradiction:

Improvegas flow uniformityVSAvoidshowerhead structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Multiple functional plates (gas distribution, support, purging) are merged into a single integrated showerhead assembly, achieving complex gas flow control and uniformity while maintaining a compact unified structure rather than separate components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The showerhead plates serve multiple functions simultaneously: gas distribution through slots, structural support for the substrate, and purging capabilities through dedicated channels, reducing the need for separate components and simplifying the overall system

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11501956B2Semiconductor reaction chamber showerhead

Publication Date: 2022.11.15 ASM IP HLDG BV

AI summary

A showerhead including a body having an opening, a first plate positioned within the opening and having a plurality of slots, a second plate positioned within the opening and having a plurality of slots, and wherein each of the first plate plurality of slots are concentrically aligned with the second plate plurality of slots.