Solar Cell Electrode Composition Using Cellulose Binder
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Solution Overview
Problem
Existing solar cell electrode compositions face challenges in achieving high efficiency and stability due to increased contact resistance and varying firing temperatures, which affect the p-n junction and series resistance, while also requiring improved printability and electrical resistivity characteristics.
Innovation Solution
A composition for forming a solar cell electrode comprising a conductive powder, a glass frit, and an organic binder with a cellulose compound, where the cellulose compound has a specific structural unit and weight average molecular weight, enhancing adhesion and dispersibility, and including additives for improved printability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic binders are used in electrode composition, then the composition can be manufactured easily, but the contact resistance increases and efficiency decreases
Solution Approach 1:
The patent changes the chemical parameters of the organic binder by specifying a cellulose compound with particular structural units (Formula 1) and molecular weight range (5,000-200,000 g/mol). This parameter optimization reduces contact resistance while maintaining ease of manufacture, as the modified cellulose compound retains processability characteristics.
Solution Approach 2:
The patent creates a composite organic binder system by combining the cellulose compound (Formula 1) with specific additives including dispersing agents, thixotropic agents, and plasticizers. This composite approach improves contact resistance and efficiency while preserving manufacturability through synergistic effects of the components.
2Strength
If firing temperature is increased to improve electrode formation, then electrode adhesion improves, but the p-n junction is affected and series resistance increases
Solution Approach 1:
The patent optimizes the chemical composition parameters of the organic binder (cellulose compound with specific structural units and molecular weight) to enable effective electrode formation at lower firing temperatures. This reduces thermal impact on the p-n junction while maintaining adequate electrode adhesion through improved binder performance.
3Manufacturing precision
If electrode line width is reduced to improve printability, then fine line patterns are achieved, but manufacturing precision becomes difficult to maintain
Solution Approach 1:
The patent modifies the rheological parameters of the electrode composition by selecting a cellulose compound with specific molecular weight (5,000-200,000 g/mol) and incorporating thixotropic agents and dispersing agents. These parameter changes enable the composition to maintain stability at rest while flowing smoothly during printing, achieving fine line widths with good manufacturing precision.
4Reliability
If conventional organic binders are used, then the composition is easy to manufacture, but storage stability and dispersibility are insufficient
Solution Approach 1:
The patent develops a composite organic binder formulation combining the cellulose compound (Formula 1) with specific additives including dispersing agents and thixotropic agents. This composite structure improves storage stability and dispersibility while maintaining ease of manufacture through the synergistic properties of the components.
Data Source
AI summary
A composition for forming an electrode for a solar cell includes a conductive powder, a glass fit, and an organic binder that includes a cellulose compound that includes a structural unit represented by Chemical Formula 1,Also disclosed are a solar cell electrode manufactured using the composition for forming an electrode for a solar cell, and a solar cell including the electrode.