Solar Cell Conductive Path for Polarization Prevention
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Solution Overview
Problem
Solar cells can become polarized in the field, leading to reduced output power due to charge leakage from the front side to the frame, causing voltage imbalances and recombination of charge carriers, which affects their efficiency.
Innovation Solution
A conductive path is provided to bleed charge from the front side of the solar cell to the bulk of the wafer through patterned holes in the dielectric passivation layer, a conductive anti-reflective coating, or layers of conductive material, and biasing a region of the solar cell module on the front side to prevent polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric passivation layer is applied to protect the solar cell front side, then the solar cell is protected from environmental damage, but charge accumulates on the front side causing harmful polarization
Solution Approach 1:
The patent applies a porous dielectric passivation layer that allows charge to bleed through to the bulk wafer while maintaining environmental protection. The porous structure provides charge dissipation pathways without compromising the protective function of the passivation layer.
Solution Approach 2:
The patent introduces an intermediary conductive layer between the dielectric passivation layer and the solar cell surface. This intermediary layer facilitates charge dissipation while allowing the dielectric layer to maintain its protective function.
2Object-generated harmful factors
If the front side of the solar cell is left exposed to allow charge dissipation, then polarization is reduced, but the solar cell becomes vulnerable to environmental conditions
Solution Approach 1:
The porous dielectric passivation layer simultaneously provides environmental protection and charge dissipation pathways, resolving the contradiction between protection and polarization reduction.
Solution Approach 2:
The patent uses a composite structure combining dielectric and conductive materials in the passivation layer, enabling both protective and charge-dissipating functions to coexist.
3Device complexity
If charge is allowed to accumulate on the front side, then the solar cell structure remains simple, but output power is reduced due to recombination
Solution Approach 1:
The porous passivation layer provides charge dissipation pathways without requiring complex additional structures, maintaining relative simplicity while preventing charge accumulation that would reduce output power.
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
This solution effectively minimizes harmful polarization by ensuring charge is dissipated, maintaining optimal voltage differentials and enhancing the solar cell's power generation capability by preventing charge buildup and recombination.
Implementation Method 1
providing a conductive path that bleeds charge from a front side of a solar cell to the bulk of a wafer
Implementation Method 2
a conductive anti-reflective coating
Implementation Method 3
Solar radiation impinging on the solar cell creates electrons and holes that migrate to the p-type and n-type regions, thereby creating voltage differentials across the p-n junctions
Data Source
AI summary
In one embodiment, harmful solar cell polarization is prevented or minimized by providing a conductive path that bleeds charge from a front side of a solar cell to the bulk of a wafer. The conductive path may include patterned holes in a dielectric passivation layer, a conductive anti-reflective coating, or layers of conductive material formed on the top or bottom surface of an anti-reflective coating, for example. Harmful solar cell polarization may also be prevented by biasing a region of a solar cell module on the front side of the solar cell.