Photovoltaic Cell Microenvironment for Passivation Layer Protection

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Solution Overview

Problem

High-throughput photovoltaic cell manufacturing facilities face challenges in maintaining the integrity of ultra-thin quantum-tunneling barrier layers due to environmental contaminants and moisture, leading to reduced efficiency and yield, as conventional cleanroom technologies are costly and impractical for large-scale facilities.

Innovation Solution

A controlled microenvironment is created to protect photovoltaic cells during fabrication, using air purification systems and portable nitrogen-filled cabinets to segregate wafers from the larger environment, ensuring controlled humidity, chemical content, and particulate levels, thereby minimizing contamination and degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional cleanroom technologies are used to protect photovoltaic cells from environmental contaminants, then the integrity of ultra-thin quantum-tunneling barrier layers is improved, but the cost and complexity of the manufacturing facility increases significantly

Engineering Contradiction:

Improveintegrity of quantum-tunneling barrier layersVSAvoidcleanroom infrastructure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the manufacturing facility into multiple isolated chambers (first processing station, second processing station, and controlled microenvironment) connected by transfer mechanisms. This segmentation allows each chamber to have specific environmental controls only where needed, rather than requiring the entire facility to be a cleanroom, thus reducing overall complexity while maintaining layer integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces transfer mechanisms (such as sealed transfer chambers or robotic arms) as intermediaries between processing stations. These intermediaries maintain controlled environments during wafer transport, protecting the quantum-tunneling barrier layers from contamination without requiring the entire facility to be environmentally controlled.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conventional cleanroom technologies are deployed throughout the photovoltaic cell fabrication facility, then contamination of passivation layers is reduced, but the manufacturing cost becomes prohibitively high

Engineering Contradiction:

Improvequality of passivation layersVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies environmental control only to specific local areas (processing chambers and transfer mechanisms) where the ultra-thin quantum-tunneling barrier layers are present, rather than controlling the entire facility. This localized approach maintains passivation layer quality while significantly reducing manufacturing costs compared to facility-wide cleanroom implementation.

Inventive Principle:

Principle #3Local quality

3Productivity

If the photovoltaic cell throughput is increased to achieve high-volume production, then the productivity is improved, but the exposure time to environmental contaminants increases, degrading the quantum-tunneling barrier layers

Engineering Contradiction:

Improvewafer processing throughputVSAvoidquality of quantum-tunneling barrier layers

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements continuous transfer mechanisms and sealed pathways between processing stations, allowing wafers to move through the system without exposure to the external environment. This continuous controlled environment maintains barrier layer quality even during high-volume production, eliminating the trade-off between throughput and protection.

Inventive Principle:

Principle #20Continuity of useful action

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 significantly improves the yield of high-efficiency photovoltaic cells by preserving the integrity of passivation layers, allowing for higher open-circuit voltage and fill factor, and reduces the need for extensive cleanroom infrastructure, making the process more cost-effective and scalable.

Implementation Method 1

a good surface passivation process is needed

Methodology Applied

Scientific EffectSurface passivation:

Implementation Method 2

Gaseous contaminants and moisture in the atmosphere can often cause degradation of the QTB layers

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

Conventional cleanroom technologies have been widely deployed in integrated circuit (IC) fabrication

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS9391230B1Method for improving solar cell manufacturing yield

Publication Date: 2016.07.12 SIERRA SOLAR POWER HANGZHOU CO LTD

AI summary

A method is described for protecting photovoltaic cells. During the fabrication process, a photovoltaic cell can be received from a first processing station. The photovoltaic cell can have at least one exposed surface, which may include crystalline silicon or oxidized crystalline silicon. The photovoltaic cell can then be placed in a controlled microenvironment with controlled chemical content, which can protect the exposed surface of the photovoltaic cell from contamination. Subsequently, the photovoltaic cell can be moved toward and delivered to a second processing station in the controlled microenvironment.