Dye Molecule XD/YA Ratio for Low-Light Solar Cell Efficiency
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Solution Overview
Problem
Existing dye-sensitized solar cells, such as Gratzel cells, have not achieved sufficiently high photoelectric conversion efficiency, especially in environments with low illuminance, like indoor settings.
Innovation Solution
A photoelectric conversion element is designed with a solid semiconductor layer containing a novel dye molecule, where the ratio of donor part XD to acceptor part YA is 2 or more, allowing efficient light absorption and electron migration, suppressing reverse electron migration and enhancing conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dyes are used in dye-sensitized solar cells, then the device can operate with simpler structure and lower cost, but the photoelectric conversion efficiency is insufficient especially in low-illuminance environments
Solution Approach 1:
The patent changes the molecular structure parameters of the dye by introducing a specific ratio (XD/YA ≥ 2) of electron-donating to electron-withdrawing groups. This parameter change optimizes light absorption and electron injection efficiency, achieving high conversion efficiency even in low-illuminance environments while maintaining reasonable structural complexity
Solution Approach 2:
The dye molecule is designed as a composite structure combining multiple functional groups (XD and YA) in a specific ratio. This composite molecular architecture enables synergistic effects that enhance both light harvesting and charge separation, resolving the contradiction between efficiency improvement and structural simplicity
2Power
If the dye molecule has high light absorption capability, then more electrons are generated, but reverse electron migration increases leading to recombination losses
Solution Approach 1:
The patent applies preliminary anti-action by designing the dye molecule with electron-withdrawing groups (YA) positioned to preemptively counteract reverse electron migration. The specific XD/YA ratio ≥ 2 creates an internal electric field that prevents electron back-transfer to the dye, thereby reducing recombination losses while maintaining high electron generation
Solution Approach 2:
The dye molecule exhibits local quality differentiation with distinct electron-donating (XD) and electron-withdrawing (YA) regions. This spatial separation of electronic functions creates directional electron flow that enhances forward electron injection while suppressing reverse migration, effectively decoupling electron generation from recombination losses
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 novel dye molecule structure achieves higher photoelectric conversion efficiency compared to traditional dye-sensitized solar cells, even in low-illuminance environments, by efficiently absorbing light, generating electrons, and preventing recombination.
Implementation Method 1
photoanode that includes a solid semiconductor layer containing a dye molecule
Implementation Method 2
efficiently absorbing light
Data Source
AI summary
A photoelectric conversion element includes a photoanode that includes a solid semiconductor layer containing a dye molecule, a counter electrode, and an electrolyte medium disposed between the photoanode and the counter electrode. The dye molecule includes XD represented by chemical formula (1) and YA represented by chemical formula (2) in a molecule:R(XD/YA), which is a ratio of the number of XD to the number of YA in the dye molecule, is 2 or more.