Fluoro-Substituted Phenyl Polymer for Photovoltaic Efficiency
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Solution Overview
Problem
Conventional photovoltaic cells face limitations in efficiency due to the ability of photoactive materials to absorb light and generate charge carriers, which restricts their overall performance in energy conversion.
Innovation Solution
Introducing a fluoro-substituted phenyl moiety into a conjugated polymer to lower the highest occupied molecular orbital (HOMO) without significantly altering the bandgap, resulting in improved open circuit voltage and energy conversion efficiency in photovoltaic cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photoactive materials are used, then the photovoltaic cell can be manufactured with standard materials, but the energy conversion efficiency is limited due to absorption and charge carrier generation constraints
Solution Approach 1:
The patent modifies the chemical structure of the photoactive polymer by incorporating fluoro-substituted phenyl moieties, which changes the electronic parameters (HOMO level) of the material. This parameter change enables improved energy conversion efficiency while maintaining adequate charge carrier generation
Solution Approach 2:
The patent creates a composite polymer structure combining fluoro-substituted phenyl groups with conjugated polymer backbones, achieving synergistic effects that improve both energy conversion efficiency and charge carrier generation through the combined properties of the composite material
2Use of energy by moving object
If the photoactive layer is made thicker to improve light absorption, then more light can be absorbed, but manufacturing cost increases and continuous roll-to-roll processes become more difficult
Solution Approach 1:
The fluoro-substituted phenyl modification changes the optical and electronic parameters of the polymer, enabling enhanced light absorption in thinner films. This allows maintaining good light absorption while using thinner photoactive layers that are easier to manufacture using continuous roll-to-roll processes
3Power
If the HOMO level is lowered to improve open circuit voltage, then the open circuit voltage increases, but the bandgap may change affecting overall performance
Solution Approach 1:
The patent precisely controls the parameter changes by selecting specific fluoro-substituted phenyl structures that lower the HOMO level to improve open circuit voltage while maintaining the bandgap within the optimal range for energy conversion efficiency
Solution Approach 2:
The fluoro-substituted phenyl moieties are incorporated at specific positions in the polymer structure, creating local electronic modifications that lower HOMO level without significantly affecting the overall bandgap, thus achieving improved open circuit voltage while maintaining energy conversion efficiency
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 polymer design enhances the open circuit voltage and energy conversion efficiency of photovoltaic cells by lowering the HOMO and maintaining a desirable bandgap, leading to improved hole mobility and fill factor, while allowing for thicker photoactive layers that can be manufactured cost-effectively using continuous roll-to-roll processes.
Implementation Method 1
Photovoltaic cells are commonly used to transfer energy in the form of light into energy in the form of electricity. Atypical photovoltaic cell includes a photoactive material disposed between two electrodes. Generally, light passes through one or both of the electrodes to interact with the photoactive material, thereby generating charge carriers (i.e., electrons and holes).
Data Source
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AI summary
Novel photoactive polymers, as well as related photovoltaic cells, articles, systems, and methods, are disclosed.