Solar Cell Design for Enhanced Light Absorption and Efficiency
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Summary
Problems
Conventional solar cells face inefficiencies in light absorption and carrier collection due to surface defects and reflections, leading to reduced energy conversion efficiency.
Innovation solutions
A solar cell design featuring a substrate with a textured surface, a multi-layered front passivation region comprising silicon oxide, aluminum oxide, and hydrogenated silicon nitride, and a multi-layered back passivation region with silicon oxide, hydrogenated silicon nitride, and aluminum oxide, which enhances light absorption and carrier collection by minimizing reflections and surface defects.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a conventional single-layer passivation structure is used, then the manufacturing process is simple, but light absorption is insufficient and carrier recombination occurs at surface defects
Why choose this principle:
The patent applies composite materials by using multiple passivation layers with different materials (silicon oxide, silicon nitride, aluminum oxide) instead of a single material. Each layer provides different functions: silicon oxide for excellent passivation, silicon nitride for anti-reflection and mechanical protection, and aluminum oxide for additional passivation and stability. This composite structure resolves the contradiction by achieving superior energy conversion efficiency through combined material properties while managing the increased structural complexity.
Principle concept:
If a conventional single-layer passivation structure is used, then the manufacturing process is simple, but light absorption is insufficient and carrier recombination occurs at surface defects
Why choose this principle:
The patent segments the passivation function into multiple distinct layers, each with specific thicknesses and material compositions. The front passivation region includes multiple layers with thicknesses ranging from 5-100 nm each, and the back passivation region similarly uses multiple layers. This segmentation allows each layer to optimize for its specific function (passivation, anti-reflection, mechanical protection) thereby achieving high energy conversion efficiency while the modular structure makes the complexity manageable.
Application Domain
Data Source
AI summary:
A solar cell design featuring a substrate with a textured surface, a multi-layered front passivation region comprising silicon oxide, aluminum oxide, and hydrogenated silicon nitride, and a multi-layered back passivation region with silicon oxide, hydrogenated silicon nitride, and aluminum oxide, which enhances light absorption and carrier collection by minimizing reflections and surface defects.
Abstract
A solar cell is discussed. The solar cell includes a substrate of a first conductive type, an emitter region which is positioned at a front surface of the substrate and has a second conductive type different from the first conductive type, a front passivation region including a plurality of layers which are sequentially positioned on the emitter region, a back passivation region which is positioned on a back surface opposite the front surface of the substrate and includes three layers, a plurality of front electrodes which pass through the front passivation region and are connected to the emitter region, and at least one back electrode which passes through the back passivation region and is connected to the substrate.