Solar Cell Layer Structure for Selective Carrier Collection
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Solution Overview
Problem
Current solar cell technologies face limitations in achieving higher photoelectric conversion efficiency despite advancements, necessitating innovative structural and material optimizations to enhance light absorption and carrier collection.
Innovation Solution
The solar cell design incorporates a substrate with specific passivation and insulating layers, tunnel oxide structures, and textured surfaces to reduce recombination and improve light utilization, featuring a stacked structure with doped layers and insulating layers to optimize carrier collection and surface passivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional solar cell structures (PERC, TOPCON, HIT, IBC) are used, then manufacturing and basic functionality are maintained, but photoelectric conversion efficiency cannot be further improved
Solution Approach 1:
The solar cell is divided into distinct functional regions: a first region with a first doped layer and tunnel oxide layer for carrier collection, and a second region with a second doped layer for additional carrier collection. This segmentation allows each region to be optimized for its specific function, improving overall photoelectric conversion efficiency while maintaining manageable structural complexity.
Solution Approach 2:
Different regions of the solar cell are assigned different properties: the first region has a tunnel oxide layer for selective carrier collection, while the second region has a different doped layer configuration. This local differentiation optimizes carrier collection at each interface, reducing recombination losses and improving efficiency without requiring complete structural redesign.
2Reliability
If more passivation layers and insulating layers are added to reduce recombination, then carrier collection is improved, but device complexity increases
Solution Approach 1:
The first insulating layer and second insulating layer are positioned to work together in coordinating fashion, with the second insulating layer extending between the first doped layer and tunnel oxide layer. This merging of insulating functions reduces the need for separate, additional passivation layers, maintaining high carrier collection efficiency while limiting the increase in structural complexity.
Solution Approach 2:
The tunnel oxide layer acts as an intermediary between the first doped layer and the substrate, providing selective carrier collection. The insulating layers serve as intermediaries between different doped regions, managing carrier flow and reducing recombination. These intermediary layers are strategically placed to maximize their beneficial effects while minimizing the total number of layers required.
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 configuration enhances the solar cell's efficiency by reducing recombination centers, improving light absorption, and optimizing carrier collection, leading to increased photoelectric conversion efficiency.
Implementation Method 1
a tunnel oxide layer... selectively collect carriers
Implementation Method 2
a first passivation layer located on the first surface... a second passivation layer located in the second region... reduce recombination
Implementation Method 3
the photoelectric conversion efficiency of solar cells has gradually increased
Data Source
AI summary
A solar cell comprises a substrate having an opposite first surface and a second surface, and the second surface has a first regions and a second regions adjacent in the first direction; a first passivation layer located on the first surface; a first doped layer and a tunnel oxide layer sequentially stacked in the first region; a first insulating layer located on a surface of the first doped layer away from the substrate; a second passivation layer located in the second region and extending to a surface of the first insulating layer away from the substrate; a second doped layer located on a surface of the second passivation layer away from the substrate, and a second insulating layer located between the second passivation layer and the first doped layer, the tunnel oxide layer in the first direction, a surface of the second insulating layer away from the substrate contacting with the first insulating layer.