Solar Cell Passivated Contact Structure 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 field passivation layer comprising distinct sub-layers of varying conductivity and thickness, combined with a hybrid electrode structure using a conductive adhesive and electrode film, reduces light absorption and enhances carrier transmission, allowing for improved conversion efficiency and lower production costs.
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 electrode film. This composite approach combines the high conductivity of silver with the cost benefits and functional advantages of alternative materials, achieving both electrical performance and cost reduction goals
Solution Approach 2:
The patent optimizes various parameters of the electrode system including layer thicknesses, material compositions, and doping concentrations to balance conductivity requirements with manufacturing cost. By adjusting these parameters, the design achieves acceptable electrical performance while reducing reliance on expensive silver material
2Reliability
If a passivated contact structure is designed to reduce recombination loss, then conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The passivation layer is segmented into distinct functional regions including a first passivation layer and a second passivation layer with different properties. This segmentation allows each layer to perform its specific function optimally while maintaining overall system efficiency and reducing recombination losses
Solution Approach 2:
Different regions of the passivation structure are assigned different material compositions, thicknesses, and doping concentrations tailored to their specific functional requirements. This local optimization enables effective passivation and carrier management without requiring complex structures throughout the entire device
3Reliability
If the field passivation layer has high conductivity to improve carrier transmission, then short-circuit current is improved, but light absorption increases reducing efficiency
Solution Approach 1:
The field passivation layer exhibits spatially varying properties with different doping concentrations and thicknesses in different regions. Areas requiring high carrier transmission have optimized conductivity, while other regions are designed with properties that minimize light absorption, achieving a local optimization of both functions
Solution Approach 2:
The patent addresses the trade-off by introducing additional design dimensions including vertical layering and lateral property variations. This multi-dimensional approach allows simultaneous optimization of carrier transmission and light absorption characteristics that cannot be achieved through single-parameter adjustment
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 solution effectively enhances short-circuit current and conversion efficiency while reducing manufacturing costs by utilizing a conductive adhesive and electrode film, which can be made from lower-cost materials, thereby addressing the limitations of existing technologies.
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
AI summary
The present disclosure provides a solar cell and a method for producing same. The solar cell includes: a substrate; a first passivation film, an anti-reflection layer and at least one first electrode formed on a front surface of the substrate; and a tunneling layer, a field passivation layer and at least one second electrode formed on a rear surface. The field passivation layer includes a first field passivation sub-layer and a second field passivation sub-layer; 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, a conductive adhesive and an electrode film that are sequentially formed in a direction away from the substrate.