Double-Capped Electron Donor Material for Organic Solar Cell Morphology
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Solution Overview
Problem
Existing micromolecule electron donor materials based on the BDT core suffer from suboptimal phase separation morphology and lower photoelectric conversion efficiency, especially when combined with fullerene electron acceptors, limiting their suitability for large-scale printing applications.
Innovation Solution
A double-capped micromolecule electron donor material is developed with a novel molecular structure, optimized through a new capping design, enhancing solubility, stability, and phase separation with micromolecule acceptors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional micromolecule electron donor materials based on BDT core are used, then the materials have good solubility and stability, but the photoelectric conversion efficiency is limited due to suboptimal phase separation morphology
Solution Approach 1:
The invention divides the single capping group into two separate capping groups (double-capped structure), creating compounds with formulas (I) and (II). This segmentation allows independent optimization of each capping group's function, improving phase separation morphology and photoelectric conversion efficiency while maintaining the solubility and stability provided by the BDT core structure
Solution Approach 2:
The invention creates composite molecular structures by combining the BDT core with specific capping groups (such as indolo[3,2-b]indole, carbazole, or triphenamine derivatives). This composite approach integrates the beneficial properties of different molecular components, achieving both good processability from the core and improved efficiency from the capping groups
2Productivity
If non-fullerene electron acceptor materials are used to achieve high photoelectric conversion efficiency, then the efficiency exceeds 16%, but the materials are more expensive and sensitive to film thickness, making them unsuitable for large-scale printing
Solution Approach 1:
The invention optimizes molecular parameters of the donor materials (such as LUMO energy levels and molecular weight) to match fullerene acceptors better. By adjusting these parameters, the system achieves improved efficiency with fullerene-based acceptors while maintaining solution processability and reducing film thickness sensitivity, enabling large-scale printing applications
3Productivity
If optimization strategies focus on core and end-capping of BDT-based donor materials, then some improvement is achieved, but progress is slower compared to polymer-micromolecule system development
Solution Approach 1:
The invention extracts and emphasizes the capping group as a独立 optimization target, separating it from the core structure. By focusing specifically on designing and optimizing capping groups (formulas I and II), the research achieves rapid progress without requiring complex structural changes to the entire molecular system, accelerating development compared to holistic optimization approaches
Data Source
AI summary
Disclosed is a double-capped micromolecule electron donor material, its preparation and application. The micromolecule electron donor material comprises a molecular structure as shown in formula (I). The double-capped micromolecule electron donor material of the application has good solubility, stability, photoelectric property and solution processability, and may be used as an electron donor material for all-micromolecule organic solar cells.