Double-Sided Solar Cell with Anti-Reflection Layers
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Solution Overview
Problem
Conventional solar cells have low current transformation efficiency due to light being incident on only one surface of the substrate, limiting their photoelectric transformation efficiency.
Innovation Solution
A solar cell design featuring a substrate with an emitter layer, a first anti-reflection layer, a back surface field layer, and a second anti-reflection layer, where the second anti-reflection layer extends over the edges of the substrate, and both anti-reflection layers are strategically positioned to reduce light reflectance and enhance light transmittance on both surfaces, along with textured surfaces to increase light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light is incident on only one surface of the substrate, then the structure is simple, but the current transformation efficiency is low
Solution Approach 1:
The patent transitions from single-sided light reception to double-sided light reception by adding functional layers on both the front and back surfaces of the substrate. The back surface field layer and second anti-reflection layer enable the back surface to receive and convert light, effectively utilizing both surfaces (two dimensions) of the substrate for photoelectric conversion, thereby doubling the light absorption capacity and improving current transformation efficiency
2Productivity
If a double-sided light receiving structure is implemented, then the photoelectric transformation efficiency increases, but the device complexity increases
Solution Approach 1:
The patent divides the solar cell structure into distinct functional segments: front surface components (emitter layer, first anti-reflection layer) and back surface components (back surface field layer, second anti-reflection layer). This segmentation allows each layer to perform its specific function independently while contributing to the overall double-sided light reception capability, making the complex structure more manageable and manufacturable
Solution Approach 2:
The substrate serves multiple functions: it acts as the mechanical support structure, the active photoelectric conversion medium for both front and back surfaces, and the platform for forming p-n junctions. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving double-sided light reception
3Use of energy by moving object
If anti-reflection layers are formed on both surfaces, then light transmittance increases, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates the formation of anti-reflection layers as an integral part of the manufacturing process sequence. The first anti-reflection layer is formed on the front surface before emitter layer deposition, and the second anti-reflection layer is formed on the back surface after back surface field layer formation. This preliminary and integrated action ensures optimal light transmittance is achieved during manufacturing rather than requiring post-processing adjustments
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 enhances the solar cell's efficiency by allowing light to be incident on both sides of the substrate, reducing reflectance, and increasing light absorption, thereby improving the overall photoelectric transformation efficiency.
Implementation Method 1
an anti-reflection layer is formed on a light receiving surface of the substrate, so as to reduce a reflectance of light incident on the substrate and increase a light transmittance of a predetermined wavelength band
Implementation Method 2
The solar power generation of converting light energy into electric energy using a photoelectric transformation effect
Implementation Method 3
One or both of the front surface and the back surface of the substrate may be textured to form a textured surface having a plurality of uneven portions
Data Source
AI summary
A solar cell and a method for manufacturing the same are disclosed. The solar cell includes a substrate, an emitter layer at a front surface of the substrate, a first anti-reflection layer on the emitter layer, a back surface field layer at a back surface of the substrate, and a second anti-reflection layer on the back surface field layer. The first anti-reflection layer and the second anti-reflection layer overlap may each other.