Solar Cell Finger Electrode Paste Composition for Linewidth Control
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Solution Overview
Problem
Existing methods for manufacturing solar cell finger electrodes using printing masks with high opening rates face challenges in maintaining a small linewidth and preventing deterioration of electrical properties during the baking process, limiting the improvement in solar cell conversion efficiency.
Innovation Solution
A method involving a conductive paste with a high opening rate printing mask, comprising a conductive powder, a glass frit with specific compositions of tellurium oxide and tungsten oxide, and an organic vehicle, is used to print and bake the electrode, optimizing the aspect ratio and electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a printing mask with high opening rate (65% or more) is used to increase electrode aspect ratio, then the sunlight receiving area is increased, but the line width increases during baking causing insignificant enhancement in aspect ratio or deterioration in electrical properties
Solution Approach 1:
The patent changes the chemical composition parameters of the glass frit, specifically incorporating tellurium oxide (30-60 mol%) and tungsten oxide (0.1-10 mol%), to modify the paste's rheological properties and prevent line width increase during baking when using high opening rate masks
Solution Approach 2:
The patent uses a composite glass frit system combining multiple metal oxides (tellurium oxide, tungsten oxide, and other metal oxides) to achieve both high aspect ratio electrode formation and stable line width control during the baking process
2Productivity
If a printing mask with high opening rate (65% or more) is used to improve electrode aspect ratio, then the conversion efficiency is improved, but the electrical properties deteriorate during baking
Solution Approach 1:
The patent modifies the glass frit composition parameters to include specific ranges of tellurium oxide (30-60 mol%) and tungsten oxide (0.1-10 mol%), which control the paste's flow and drying characteristics to maintain electrical properties while achieving high conversion efficiency through improved aspect ratio
3Shape
If the opening rate is increased to 65% or more to reduce mesh area, then the electrode aspect ratio is improved, but the line width increases during baking
Solution Approach 1:
The patent changes the chemical composition of the conductive paste, specifically the glass frit component, to include tellurium oxide and tungsten oxide in controlled amounts, which modifies the paste's viscosity and drying behavior to prevent line width increase while maintaining high aspect ratio shape
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 method effectively suppresses linewidth increase and maintains excellent electrical properties, enhancing solar cell conversion efficiency by maximizing the light receiving area and minimizing serial resistance.
Implementation Method 1
baking the printed conductive paste
Implementation Method 2
baking the printed conductive paste
Implementation Method 3
baking the printed conductive paste at about 600° C. to about 1,000° C.
Data Source
AI summary
A method of manufacturing a finger electrode for a solar cell, the method including printing a conductive paste on a front surface of a substrate using a printing mask having an opening rate of about 65% or more and baking the printed conductive paste. The conductive paste includes a conductive powder, a glass frit including about 30 mol % to about 60 mol % of tellurium oxide and about 0.1 mol % to about 10 mol % of tungsten oxide, and an organic vehicle.