Solar Cell Doped Layer Layout for Selective Ohmic Contact
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Solution Overview
Problem
In solar cell manufacturing, the contact between the electrode and the lightly doped region affects substrate passivation, leading to reduced performance.
Innovation Solution
A solar cell design with a doped layer having a heavily doped region, edge regions, and connecting regions, where the electrode forms an ohmic contact only with the heavily doped region, optimizing doping concentrations and junction depths to improve passivation and reduce carrier recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the doped layer structure is simplified to reduce manufacturing complexity, then manufacturing precision may deteriorate due to inadequate electrode-doped layer alignment
Solution Approach 1:
The doped layer is divided into regions with different doping concentrations (heavily doped regions and lightly doped regions) to optimize both electrical performance and manufacturing alignment. The heavily doped regions provide clear visual markers for alignment while maintaining overall device functionality.
2Reliability
If the doped layer is uniformly heavily doped to improve electrical contact, then optical absorption increases reducing light utilization efficiency
Solution Approach 1:
Different regions of the doped layer have different doping concentrations optimized for their specific functions. Heavily doped regions under electrodes provide excellent electrical contact, while lightly doped regions in between minimize optical absorption and maximize light utilization for charge generation.
3Loss of energy
If the doped layer is uniformly lightly doped to reduce optical absorption, then electrical contact deteriorates
Solution Approach 1:
The doped layer employs spatially varying doping concentrations where heavily doped regions are positioned at electrode interfaces to ensure low resistance electrical contact, while lightly doped regions are positioned in areas where light absorption should be minimized, thus simultaneously optimizing both electrical and optical performance.
4Manufacturing precision
If the doped layer structure is made complex to improve alignment precision, then manufacturing complexity increases
Solution Approach 1:
The doped layer uses regions of different doping concentrations that create distinct visual or electrical signatures during manufacturing, enabling precise alignment of electrodes with underlying doped regions without requiring overly complex structural features. The varying doping profiles provide inherent alignment cues.
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 design enhances the open-circuit voltage, fill factor, and conversion efficiency of the solar cell by improving the ohmic contact and passivation on the substrate surface.
Implementation Method 1
the heavily doped region can provide spaces more than spaces corresponding to the connecting electrodes and the edge electrodes, that is, the heavily doped region may provide a space-charge limited current transport mechanism to improve charge extraction efficiency
Implementation Method 2
Solar cell and manufacturing method thereof, photovoltaic module and photovoltaic system
Data Source
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AI summary
The present disclosure relates to the technical field of solar cells, and in particular, to a solar cell and a manufacturing method thereof, a photovoltaic module and a photovoltaic system. In the embodiment of the present disclosure, a doped layer of the solar cell includes a lightly doped region and a heavily doped region, the heavily doped region includes a body region, connecting regions, and edge regions, and an electrode includes an electrode body, connecting electrodes and edge electrodes. The body region substantially corresponds to the electrode body, and the connecting regions and the edge regions can provide spaces more than spaces corresponding to the connecting electrodes and the edge electrodes.