Ruthenium Complex Dye for Solar Light Absorption
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Solution Overview
Problem
Current dye-sensitized solar cells face challenges in achieving high photoelectric conversion efficiency due to limitations in the absorption coefficient of conventional photosensitizer dyes, which affect their ability to effectively convert solar light into electrical output.
Innovation Solution
A ruthenium (Ru) complex photosensitizer dye with specific functional groups (X1, X2, Z1, and Z2) is developed, enhancing light absorption capabilities by aligning its absorption spectrum with solar light and optimizing energy levels for efficient electron transport and hole retrieval, thereby improving the photoelectric conversion efficiency of dye-sensitized solar cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional photosensitizer dyes are used in dye-sensitized solar cells, then the cell structure is simple and easy to manufacture, but the photoelectric conversion efficiency is limited due to low absorption coefficient
Solution Approach 1:
The patent modifies the molecular structure of photosensitizer dyes by changing chemical parameters - specifically introducing ruthenium complexes with bipyridine ligands containing electron-donating groups (methoxy, hydroxy, amino groups). These parameter changes in molecular composition and structure result in enhanced absorption coefficients and improved photoelectric conversion efficiency while maintaining the feasibility of manufacturing
Solution Approach 2:
The patent creates composite photosensitizer molecules by combining ruthenium metal centers with organic bipyridine ligands and various substituent groups. This composite material approach allows optimization of light absorption properties through the synergistic combination of different functional groups, achieving higher photoelectric conversion efficiency without compromising manufacturability
2Device complexity
If the absorption spectrum of photosensitizer dye is not aligned with solar light spectrum, then the dye structure is simple, but the light absorption capability is insufficient
Solution Approach 1:
The patent systematically adjusts molecular parameters of the photosensitizer dye - specifically the HOMO-LUMO energy gap and molecular orbital levels - by introducing electron-donating groups at specific positions on the bipyridine ligand. These parameter changes shift the absorption spectrum to better overlap with the solar light spectrum, maximizing light absorption capability while managing structural complexity
Solution Approach 2:
The patent applies local quality modification by placing specific electron-donating groups (methoxy, hydroxy, amino) at particular positions on the bipyridine ligand structure. This localized functional group placement optimizes electron density distribution and HOMO-LUMO energy levels in specific regions, enhancing overall light absorption capability without requiring complete structural redesign
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 ruthenium complex photosensitizer dye significantly increases the absorption coefficient and photoelectric conversion efficiency of dye-sensitized solar cells, making them more effective in converting solar light into electrical current, with efficiencies reaching up to 10.5-11.0% compared to conventional dyes.
Implementation Method 1
the photosensitizer dye is a ruthenium (Ru) complex... the absorption spectrum of the photosensitizer dye of the present invention is close to the solar light spectrum... the photoelectric conversion efficiency of a dye-sensitized solar cell using the dye is enhanced
Data Source
AI summary
A photosensitizer dye is provided. The photosensitizer dye is a Ru complex as formula (1):