Nanostructured Solar Cell Electrode Light Absorption
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Solution Overview
Problem
Conventional silicon solar cells have low utilization efficiency due to the poor sunlight transmittance of metal materials used in their upper electrodes, limiting the conversion of light energy into electrical energy.
Innovation Solution
The solar cell design incorporates a three-dimensional nanostructured upper electrode with pine-shaped ridges, comprising rectangular and triangular prism structures, which are arranged parallel to the doped silicon layer, enhancing light resonance and absorption across a broader wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal mesh is used as the upper electrode, then electrical conductivity is ensured, but sunlight transmittance deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional metal mesh electrode to a three-dimensional nanostructured electrode array. The vertical nanostructures (nanowires, nanorods, or nanopillars) extend into the third dimension, allowing sunlight to interact with the structures through multiple pathways including side surfaces and top surfaces, thereby improving light absorption while maintaining electrical conductivity through the vertically oriented conductive material array.
Solution Approach 2:
The nanostructured electrode array creates a porous or open architecture where light can penetrate through the spaces between individual nanostructures. This porous arrangement allows sunlight to reach the active layers beneath while the distributed conductive nanostructures maintain electrical conductivity across the electrode area, resolving the contradiction between light transmittance and electrical conductivity.
2Ease of manufacture
If conventional metal mesh is used as the upper electrode, then manufacturing simplicity is maintained, but photoelectric conversion efficiency deteriorates
Solution Approach 1:
The patent changes the structural parameters of the electrode from a continuous mesh pattern to discrete nanostructured elements with controlled dimensions (diameter, length, spacing). By optimizing these nanoscale parameters, the electrode achieves enhanced light trapping and absorption characteristics that improve photoelectric conversion efficiency, while the fabrication processes (such as colloidal assembly, electrochemical deposition, or vapor-phase growth) remain relatively straightforward and scalable.
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 nanostructured upper electrode improves the photoelectric conversion efficiency by achieving resonance at different wavelengths, effectively increasing the range of resonant waves and enhancing light intensity and conduction at a nanometer scale.
Implementation Method 1
The plurality of three-dimensional nanostructures can achieve resonance at different wavelengths, thereby effectively increasing the range of resonant waves and enhancing light intensity and conduction at a nanometer scale
Implementation Method 2
Solar cells work via photovoltaic effects of the semiconductor materials
Data Source
AI summary
A solar cell including: a silicon substrate; a back electrode; a doped silicon layer; an upper electrode, wherein the upper electrode includes a plurality of three-dimensional nanostructures extending along a same direction; an electrode lead, wherein a direction of the electrode lead intersects with the direction of the plurality of three-dimensional nanostructures; wherein the three-dimensional nanostructures includes a first rectangular structure, a second rectangular structure, and a triangular prism structure; the first rectangular structure, the second rectangular structure, and the triangular prism structure are stacked, a first width of a bottom surface of the triangular prism structure is equal to a second width of a top surface of the second rectangular structure, and is greater than a third width of a top surface of the first rectangular structure, materials of the first rectangular structure and the triangular prism structure are metal.