Fullerene Derivative Bonding for OPV Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic photovoltaic (OPV) devices face challenges in efficiency and material processing, particularly with regioregular polythiophenes, which require improvements in nanoscale morphology and device performance to enhance solar cell applications.
Innovation Solution
A composition comprising a mixture of p-type and n-type materials, where the n-type material is a fullerene derivative with a surface featuring six-membered and five-membered rings, covalently bonded through [4+2] cycloaddition, is used to create a photovoltaic device with improved efficiency and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fullerene derivatives are used in OPV devices, then device efficiency is limited, but using advanced fullerene derivatives with specific bonding improves photovoltaic efficiency
Solution Approach 1:
The patent modifies the chemical structure of fullerene derivatives by changing the bonding configuration to [4+2] cycloaddition and specifying particular ring structures (six-membered and five-membered rings). These parameter changes in molecular structure lead to improved photovoltaic efficiency while managing the complexity through targeted structural modifications rather than comprehensive redesign
Solution Approach 2:
The invention creates composite material systems by combining p-type materials with specifically structured n-type fullerene derivatives. This composite approach allows the fullerene derivatives to contribute their improved electron-accepting properties while the p-type materials provide hole transport, achieving enhanced overall device efficiency through synergistic material combinations
2Manufacturing precision
If regioregular polythiophenes are used, then nanoscale morphology can be controlled, but device performance requires further improvement
Solution Approach 1:
The patent applies local quality by combining regioregular polythiophenes (which provide controlled nanoscale morphology in specific regions) with advanced fullerene derivatives (which provide improved electronic properties). This local optimization of different material properties throughout the active layer achieves both morphology control and enhanced device performance
Solution Approach 2:
The invention creates a composite active layer combining regioregular polythiophenes and specifically structured fullerene derivatives. The polythiophene component provides the nanoscale morphology control through its regular structure, while the fullerene derivative component enhances electron acceptance and transport, together achieving superior device performance
3Duration of action of stationary object
If standard fullerene derivatives are used, then material processing is simplified, but device lifetime is reduced
Solution Approach 1:
The patent changes the chemical parameters of fullerene derivatives by specifying [4+2] cycloaddition bonding and particular ring structures. These parameter changes improve device lifetime through enhanced material stability and reduced degradation, while the processing remains feasible through solution-based methods and standard fabrication techniques
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
This approach results in better photovoltaic efficiency, versatility in active layer systems, and extended device lifetime, with enhanced material and processability, leading to improved solar cell performance.
Implementation Method 1
Organic photovoltaic (OPV) devices can provide improvements over older silicon devices
Implementation Method 2
R is covalently bonded to the fullerene by [4+2] cycloaddition
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Photovoltaic cells comprising an active layer comprising, as p-type material, conjugated polymers such as polythiophene and regioregular polythiophene, and as n-type material at least one fullerene derivative. The fullerene derivative can be C60, C70, or C84. The fullerene also can be functionalized with indene groups. Improved efficiency can be achieved.