Solar Cell Rear Passivation Stack With Hybrid Silver Electrode
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Solution Overview
Problem
Current solar cell technologies face limitations in conversion efficiency due to recombination losses in metal contact areas and high manufacturing costs associated with silver electrodes, which hinder further improvements in efficiency and cost reduction.
Innovation Solution
A solar cell design featuring a substrate with a first passivation film, anti-reflection layer, and electrodes, including a field passivation layer with varying conductivity and thickness sub-layers, and a hybrid electrode structure using a conductive adhesive and non-silver metal composite, optimizing carrier transmission and reducing light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver is used as electrode material to reduce resistivity, then electrical conductivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a composite electrode structure consisting of multiple layers including silver paste, conductive adhesive, and non-silver metal composite materials. This composite approach combines the high conductivity of silver with the cost advantages and functional benefits of alternative materials, achieving a balance between electrical performance and manufacturing cost.
Solution Approach 2:
The electrode structure is designed with different material compositions in different regions and layers. The silver paste provides conductivity where most needed, while the conductive adhesive and non-silver metal composite materials are used in other areas to reduce cost. This localized material selection optimizes both performance and cost efficiency.
2Reliability
If passivated contact structure is designed to reduce recombination loss, then conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated structures. The field passivation layer and tunneling layer are merged to simultaneously provide carrier selectivity and surface passivation. The electrode structure itself is designed to provide both electrical contact and additional passivation functions, reducing the need for separate components and simplifying the overall device architecture.
Solution Approach 2:
The passivation layers are designed to perform multiple functions simultaneously: carrier selectivity, surface recombination reduction, and electrical contact provision. This multi-functionality reduces the number of separate components needed, thereby simplifying the device structure while maintaining high conversion efficiency.
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 design enhances short-circuit current and conversion efficiency while lowering manufacturing costs by utilizing a conductive adhesive and non-silver metal composite, effectively addressing recombination losses and cost constraints.
Implementation Method 1
a tunneling layer, a field passivation layer and at least one second electrode sequentially formed on a rear surface of the substrate
Data Source
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AI summary
The present disclosure provides a solar cell and a method for producing same. The solar cell includes: a substrate (20); a first passivation film (212), an anti-reflection layer (213) and at least one first electrode (214) formed on a front surface of the substrate; and a tunneling layer (221), a field passivation layer (226)and at least one second electrode (228) formed on a rear surface. The field passivation layer includes a first field passivation sub-layer (226a) and a second field passivation sub-layer (226b); a conductivity of the first field passivation sub-layer is greater than a conductivity of the second field passivation sub-layer, and a thickness of the second field passivation sub-layer is smaller than a thickness of the first field passivation sub-layer; either the at least one first electrode or the at least one second electrode includes a silver electrode (228a), a conductive adhesive (118b) and an electrode film (228c) that are sequentially formed in a direction away from the substrate.