Solar Cell Transmission Layer Structure for Carrier Transport
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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 a diffusion region that extends into the tunneling dielectric layer and substrate, with a higher doping ion concentration than the substrate, to enhance carrier transmission and collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional structure with tunneling dielectric layer and doped conductive layer is used, then carrier recombination on substrate surface is suppressed, but carrier transmission efficiency between doped conductive layer and substrate is reduced
Solution Approach 1:
The doped conductive layer is segmented into multiple main body portions arranged at intervals, creating a patterned structure that allows light transmission while maintaining electrical functionality. This segmentation enables both carrier collection and light utilization without compromising the passivation effect.
Solution Approach 2:
A transmission layer is introduced as an intermediary between the doped conductive layer and the substrate. This transmission layer facilitates carrier transmission while the diffusion region provides additional transmission channels, resolving the contradiction between maintaining passivation and enabling efficient carrier transport.
2Productivity
If photoelectric conversion efficiency is to be improved, then additional transmission channels are needed, but device structure complexity increases
Solution Approach 1:
The transmission layer serves multiple functions: it acts as a transmission channel for carriers, provides structural support, and enables the diffusion region to extend into the substrate. This multi-functionality allows improved photoelectric conversion without proportionally increasing structural complexity.
Solution Approach 2:
The diffusion region extends in the vertical dimension from the transmission layer into the substrate, creating three-dimensional carrier transmission pathways. This dimensional extension provides additional transmission channels without significantly increasing lateral structure complexity.
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 transmission efficiency and photoelectric conversion efficiency by providing additional transmission channels and reducing carrier recombination, thereby increasing short-circuit current and open-circuit voltage.
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
The tunneling oxide layer has good chemical passivation effect
Implementation Method 3
the doped conductive layer has good field passivation effect
Implementation Method 4
Solar cells have good photoelectric conversion capabilities
Data Source
AI summary
A solar cell, a method for manufacturing the solar cell, and a photovoltaic module are provided. 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 are arranged over a first surface of the substrate. The doped conductive layer includes main body portions. Each first electrode is disposed on and electrically connected to a side of a corresponding main body portion facing away from the substrate. Each transmission layer is disposed between a corresponding pair of adjacent main body portions. Each 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 each diffusion region is greater than a doping ion concentration of the substrate.