Solar Cell Transmission Layer for Carrier Transport and Passivation
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Solution Overview
Problem
Existing solar cells have low photoelectric conversion efficiency due to reduced carrier transmission between doped conductive layers and substrate, leading to lower power generation efficiency.
Innovation Solution
Incorporating a transmission layer between adjacent main body portions of the doped conductive layer and forming diffusion regions with higher doping ion concentrations within the transmission layer and substrate to enhance carrier transport, allowing carriers to reach the doped conductive layer without passing through the tunneling dielectric layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tunneling oxide layer and doped conductive layer are prepared on the substrate surface to suppress carrier recombination, then the passivation effect is enhanced, but the carrier transmission capacity between the doped conductive layer and substrate is reduced
Solution Approach 1:
The patent introduces a tunneling layer as an intermediary structure between the substrate and the doped conductive layer. This tunneling layer, with its specific thin-film structure and controlled doping, mediates the carrier transmission while maintaining the passivation benefits of the tunneling oxide layer, thus resolving the contradiction between passivation effectiveness and carrier transmission capacity.
Solution Approach 2:
The patent applies local quality by creating a doped conductive layer with spatially varying doping concentrations and a tunneling layer with localized properties. The doped conductive layer has higher doping concentration near the substrate interface to enhance carrier transmission, while maintaining lower doping concentration in other regions to preserve passivation effects, thus resolving the contradiction through localized property optimization.
2Reliability
If the doped conductive layer is made continuous to improve carrier collection, then the electrical conductivity is enhanced, but the light absorption is reduced
Solution Approach 1:
The patent segments the doped conductive layer into discrete regions rather than making it completely continuous. This segmentation allows light to pass through the gaps between doped regions, reducing light absorption losses while still providing sufficient conductive pathways for carrier collection through the tunneling layer and underlying substrate, thus resolving the contradiction between electrical conductivity and light absorption.
Solution Approach 2:
The patent changes the parameters of the doped conductive layer, specifically the doping concentration and layer thickness, to optimize the balance between electrical conductivity and light absorption. By controlling these parameters, the doped conductive layer maintains adequate conductivity for carrier collection while minimizing parasitic light absorption, thus resolving the contradiction.
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
Improves carrier transport efficiency and photoelectric conversion efficiency by providing additional transmission channels and reducing carrier recombination, thereby increasing the collection and transmission of carriers.
Implementation Method 1
Each diffusion region of the at least one diffusion region is partially located in a corresponding transmission layer and extends into the tunneling dielectric layer and the substrate. A doping ion concentration of the each diffusion region is greater than a doping ion concentration of the substrate.
Implementation Method 2
A tunneling dielectric layer and a doped conductive layer that are arranged over a first surface of the substrate in a direction away from the first surface of the substrate
Data Source
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AI summary
Disclosed are a solar cell, a method for manufacturing the solar cell, and a photovoltaic module. The solar cell includes a substrate, a tunneling dielectric layer, a doped conductive layer, a plurality of first electrodes, at least one transmission layer, and at least one diffusion region. The tunneling dielectric layer and the doped conductive layer that are arranged over a first surface of the substrate in a direction away from the first surface of the substrate, where the doped conductive layer at least includes a plurality of main body portions arranged at intervals. The plurality of first electrodes are arranged at intervals and extend in a first direction. Each first electrode is disposed on a side of a corresponding main body portion facing away from the substrate and is electrically connected to the corresponding main body portion. Each transmission layer of the at least one transmission layer is disposed between adjacent main body portions of the plurality of main body portions and is in contact with a side surface of each of the adjacent main body portions. Each diffusion region of the at least one diffusion region is partially located in a corresponding transmission layer and extends into the tunneling dielectric layer and the substrate, where a doping ion concentration of the each diffusion region is greater than a doping ion concentration of the substrate. According to the disclosure, the photoelectric conversion efficiency of the solar cell can be improved.