Leakage Pathway Layer for Solar Cell Charge Management
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Solution Overview
Problem
Solar cell efficiency is hindered by charge accumulation at the front surface passivation layer, leading to degradation, and vulnerability to ultra-violet radiation damage, which existing technologies fail to adequately address.
Innovation Solution
Incorporating a leakage pathway layer, composed of phosphorus- or boron-doped silicon with amorphous, nano-crystalline, or fine-grained morphology, above the dielectric layer and anti-reflective coating layer to provide a conductive pathway for charge leakage and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a front surface passivation layer is applied to reduce recombination, then open-circuit voltage is improved, but charge accumulation occurs leading to efficiency degradation
Solution Approach 1:
The passivation structure is segmented into multiple functional layers: a dielectric passivation layer for voltage improvement and a conductive leakage pathway layer for charge dissipation. This segmentation allows each layer to perform its specific function without interfering negatively with the other, resolving the contradiction between voltage improvement and efficiency maintenance.
Solution Approach 2:
The leakage pathway layer acts as an intermediary between the dielectric passivation layer and the substrate. It mediates the charge accumulation problem by providing a controlled conductive path that prevents excessive charge buildup while maintaining the passivation effect, thus preserving both voltage and efficiency.
2Ease of manufacture
If conventional passivation structures are used, then manufacturing is simple, but the solar cell is vulnerable to ultra-violet radiation damage
Solution Approach 1:
The passivation structure uses composite materials combining a dielectric material (for passivation) and a doped silicon leakage pathway layer (for UV protection and charge management). This composite structure provides both manufacturing feasibility and enhanced UV radiation resistance, resolving the contradiction between simplicity and reliability.
3Productivity
If the dielectric layer is made thinner to improve charge extraction, then charge accumulation is reduced, but polarization effects increase leading to efficiency loss
Solution Approach 1:
The leakage pathway layer serves as an intermediary that enables thin dielectric layer design without suffering from polarization effects. It provides an alternative charge dissipation path that bypasses the polarization issue inherent in thin dielectric layers, allowing efficient charge extraction while maintaining energy efficiency.
Solution Approach 2:
The invention changes the electrical conductivity parameter of the passivation structure by introducing a doped silicon leakage pathway layer. This parameter change enables the system to achieve both thin dielectric benefits (charge extraction) and avoid polarization losses through the conductive pathway.
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 leakage pathway layer reduces efficiency loss by mitigating polarization effects and increasing stability against ultra-violet radiation, thereby improving solar cell performance and reliability.
Implementation Method 1
a leakage pathway layer, composed of phosphorus- or boron-doped silicon with amorphous, nano-crystalline, or fine-grained morphology, above the dielectric layer and anti-reflective coating layer to provide a conductive pathway for charge leakage
Implementation Method 2
The leakage pathway layer reduces efficiency loss by mitigating polarization effects and increasing stability against ultra-violet radiation
Implementation Method 3
increasing stability against ultra-violet radiation
Data Source
AI summary
Leakage pathway layers for solar cells and methods of forming leakage pathway layers for solar cells are described.