Bifacial Dye-Sensitized Solar Cell With Three-Layer Semiconductor Electrode
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Solution Overview
Problem
Conventional solar cells have insufficient photoelectric conversion efficiency, necessitating the development of a bifacial light-harvesting dye-sensitized solar cell with improved efficiency.
Innovation Solution
A bifacial light-harvesting dye-sensitized solar cell is designed with a specific working electrode structure comprising three semiconductor layers of varying thicknesses and particle diameters, along with a light-transmitting catalyst layer and liquid electrolyte, to enhance light absorption and scattering, thereby improving photoelectric conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional single-layer semiconductor structure is used, then the device complexity is low, but the photoelectric conversion efficiency is insufficient
Solution Approach 1:
The semiconductor layer is divided into three distinct layers (first, second, and third semiconductor layers) with different particle diameters and thicknesses. Each layer serves a specific function in light absorption and electron transport, with the first and third layers having smaller particle diameters (15-25 nm) for efficient electron transport and the second layer having larger particle diameter (350-450 nm) for light scattering, thereby resolving the contradiction between structural complexity and photoelectric conversion efficiency
Solution Approach 2:
Different regions of the semiconductor structure are assigned different properties: the first and third semiconductor layers use small particles (15-25 nm) optimized for electron transport near the electrodes, while the second semiconductor layer uses large particles (350-450 nm) optimized for light scattering in the middle region. This local differentiation of material properties enables each region to perform its specific function optimally, achieving high photoelectric conversion efficiency
2Manufacturing precision
If light absorption is enhanced by increasing semiconductor layer thickness, then photoelectric conversion efficiency improves, but electron transport resistance increases
Solution Approach 1:
The total thickness of 5-12 μm is segmented into three layers with optimized individual thicknesses, preventing excessive thickness in any single layer. This segmentation maintains electron transport efficiency while achieving sufficient total light absorption through the combined thickness of all three layers
Solution Approach 2:
The particle diameter parameter is varied across layers (15-25 nm for first and third layers, 350-450 nm for second layer) to optimize both light scattering and electron transport properties at different positions, resolving the contradiction between thickness for light absorption and particle size for electron transport
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 three-layer semiconductor structure and light-transmitting catalyst layer significantly enhance the solar cell's ability to convert light into electricity, particularly from both the front and back surfaces, resulting in improved photoelectric conversion efficiency.
Implementation Method 1
enhance light absorption and scattering
Implementation Method 2
enhance light absorption and scattering
Implementation Method 3
photoelectric conversion efficiency
Data Source
AI summary
A bifacial light-harvesting dye-sensitized solar cell is provided and has: a first transparent substrate, a second transparent substrate, a working electrode, a first semiconductor layer, a second semiconductor layer, a third semiconductor layer, a counter electrode, a light-transmitting catalyst layer, and a liquid electrolyte. A photoelectric conversion efficiency of the dye-sensitized solar cell is improved by using a specific working electrode structure.