Solar Cell Anti-Reflection Layer Segmentation for Carrier Collection
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Solution Overview
Problem
Conventional solar cells face inefficiencies in light absorption and carrier collection due to reflection losses and recombination of carriers at the surface, leading to reduced energy conversion efficiency and increased manufacturing costs.
Innovation Solution
A solar cell design featuring a substrate with a selective emitter structure, an anti-reflection layer with strategically positioned openings under the first electrode, and a heavily doped region only under these openings, which reduces recombination and enhances carrier collection efficiency while minimizing heat application and manufacturing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a continuous anti-reflection layer is formed on the emitter region, then light reflection is reduced and light absorption is improved, but carrier recombination at the surface increases and manufacturing complexity increases
Solution Approach 1:
The anti-reflection layer is segmented by forming openings (through-holes) in specific regions, particularly in the bus bar area. This segmentation allows the anti-reflection layer to maintain its light-absorbing function in most areas while creating localized regions where carriers can be collected without suffering from surface recombination losses.
Solution Approach 2:
Different regions of the emitter are treated differently: the bus bar area has openings in the anti-reflection layer for efficient carrier collection, while other areas maintain the continuous anti-reflection layer for optimal light absorption. This local differentiation optimizes both light absorption and carrier collection performance.
2Loss of energy
If the anti-reflection layer is removed completely to improve carrier collection, then carrier recombination is reduced, but light reflection increases and light absorption decreases
Solution Approach 1:
Instead of completely removing the anti-reflection layer, openings are formed only in specific regions where carrier collection is critical (bus bar areas). This partial removal achieves the necessary carrier collection improvement while preserving the light absorption benefits of the anti-reflection layer in the remaining areas.
3Loss of energy
If a selective emitter structure with heavily doped regions is implemented, then carrier collection is improved, but manufacturing precision requirements increase and process complexity increases
Solution Approach 1:
The anti-reflection layer openings are formed first, creating a mask pattern that guides subsequent doping processes. The heavily doped regions are then formed through these openings, ensuring precise positioning without requiring complex alignment steps. This preliminary structuring simplifies the overall manufacturing precision requirements.
4Productivity
If laser processing is used to form openings and dope regions, then manufacturing time is reduced and process integration is improved, but heat application control becomes more critical
Solution Approach 1:
The laser processing is segmented into distinct steps: first forming openings in the anti-reflection layer, then separately doping through these openings. This segmentation allows optimized heat application for each step, reducing overall thermal stress and improving control while maintaining high productivity.
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 design improves the short-circuit current and overall efficiency of the solar cell by reducing carrier recombination and maintaining the selective emitter structure's characteristics, while also lowering manufacturing costs and time by optimizing heat application and laser processing.
Implementation Method 1
an anti-reflection layer positioned on the emitter region
Implementation Method 2
When light is incident on the solar cell, electrons and holes are produced in the semiconductor parts. The electrons move to the n-type semiconductor part, and the holes move to the p-type semiconductor part under the influence of the p-n junction
Data Source
AI summary
A solar cell includes a substrate containing impurities of a first conductive type, an emitter region which is positioned at a first surface of the substrate and contains impurities of a second conductive type opposite the first conductive type to form a p-n junction along with the substrate, an anti-reflection layer positioned on the emitter region, a first electrode which is positioned on the anti-reflection layer and is coupled to the emitter region, and a second electrode which is positioned on a second surface of the substrate and is coupled to the substrate. A first area of the anti-reflection layer, which is positioned under the first electrode, has a plurality of openings. The first electrode couples to the emitter region exposed through the plurality of openings.