Back-Contact Solar Cell Doped Region Layout for Lower Recombination
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Solution Overview
Problem
Existing back-contact solar cells have suboptimal photoelectric conversion performance due to inadequate arrangement of P and N regions, leading to reduced open-circuit voltage and efficiency.
Innovation Solution
A back-contact solar cell design featuring alternating first and second doped sections of different conductivity types on the substrate's surface, with specific arrangements to maximize the area occupied by these regions, thereby increasing the number of electron-hole pairs and reducing carrier recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional arrangements of P and N regions are used in back-contact solar cells, then the device complexity is reduced and manufacturing is easier, but the photoelectric conversion efficiency is insufficient due to inadequate distribution of electron-hole pairs
Solution Approach 1:
The doped layer is segmented into multiple first doped sections and second doped sections with different conductivity types, arranged in a specific pattern on the substrate. This segmentation allows for optimized distribution of electron-hole pairs while maintaining manageable device complexity through systematic arrangement
Solution Approach 2:
Different regions of the substrate are assigned different doping types (P-type or N-type) to create local quality variations. This enables each region to contribute optimally to photoelectric conversion by generating the appropriate type of charge carriers at specific locations
2Area of stationary object
If the area occupied by doped regions is increased to generate more electron-hole pairs, then the photoelectric conversion efficiency improves, but the carrier recombination at the substrate interface increases
Solution Approach 1:
The doped regions are divided into alternating first and second doped sections with different conductivity types. This segmentation allows the structure to maximize the area occupied by doped regions while creating a pattern that reduces carrier recombination through proper spatial distribution of electron and hole generating regions
Solution Approach 2:
The substrate interface, which normally causes carrier recombination loss, is utilized by forming high-low junctions that create built-in electric fields. These fields convert the potentially harmful interface into a beneficial structure that reduces recombination by directing carrier flow away from the interface
3Productivity
If alternating first and second doped sections with different conductivity types are arranged to maximize electron-hole pair generation, then the photoelectric conversion efficiency is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The doped layer is divided into discrete first and second doped sections that can be manufactured and positioned as separate units. This segmentation makes the complex alternating pattern more manufacturable by allowing modular assembly or step-by-step formation of the pattern
Solution Approach 2:
The invention specifies particular geometric parameters for the doped sections (such as dimensions and spacing) that optimize photoelectric conversion while being compatible with existing manufacturing capabilities. By carefully selecting these parameters, the design achieves high efficiency without requiring unrealistic manufacturing precision
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 improved arrangement of doped sections enhances the photoelectric conversion efficiency of the back-contact solar cell by increasing the number of electron-hole pairs and reducing carrier recombination at the substrate interface.
Implementation Method 1
Solar cells have good photoelectric conversion capabilities. One category of the P regions and the N regions forms PN junctions with a substrate, and generates corresponding electron-hole pairs
Implementation Method 2
The high-low junction forms a built-in electric field directed to the interior of the substrate, reducing the recombination rate of carriers at the interface of the substrate
Data Source
AI summary
Provided are a back-contact solar cell, a method for preparing the same, and a photovoltaic module. The solar cell includes a substrate, a plurality of first doped sections and a plurality of second doped sections. The substrate has a first side, and the first side has two opposing first edges perpendicular to a first direction and two opposing second edges perpendicular a second direction, the first direction being perpendicular to the second direction. The plurality of first doped sections are formed on the first side, and each first doped section includes a first portion extending along the second direction and a plurality of second portions distributed at intervals along the second direction, where each second portion protrudes from the first portion in a direction parallel to the second edges.