PCBM Solid Additives Extend Polymer Solar Cell Ink Shelf Life
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Solution Overview
Problem
Organic solar cells (OSCs) face significant stability challenges, leading to rapid degradation and short shelf life of polymer solar cell ink, which hinders their commercialization.
Innovation Solution
The introduction of solid state additives, specifically PCBM variants such as PC61BM and PC71BM, into the polymer solar cell ink, which forms a ternary blend with donor polymers like D18-CI and nonfullerene acceptors like Y6, enhances stability and shelf life by suppressing pre-aggregation and maintaining electron percolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid state additives (PCBM variants) are added to form ternary blend, then stability and shelf life are improved, but device complexity increases
Solution Approach 1:
PCBM variants serve as intermediary substances that mediate between the donor polymer and nonfullerene acceptor. They suppress pre-aggregation of the NFA and maintain electron percolation pathways, thereby stabilizing the ink composition and extending shelf life without requiring fundamental changes to the device architecture
Solution Approach 2:
The invention creates a ternary composite material system combining donor polymer, nonfullerene acceptor, and PCBM variants. This composite approach leverages the complementary properties of each component: the donor polymer provides hole transport, the NFA provides electron transport and light absorption, and the PCBM variants provide morphological stabilization and electron percolation, achieving enhanced overall stability
2Duration of action of stationary object
If solid state additives (PCBM variants) are added to form ternary blend, then shelf life is improved, but manufacturing process complexity increases
Solution Approach 1:
The invention modifies the compositional parameters of the ink by incorporating PCBM variants at optimized ratios (e.g., 1:1.6:0.2 for D18-CI:Y6:PCBM). This parameter change extends the ink's shelf life from a few days to over 20 days while maintaining processability through standard ink-processing techniques, balancing shelf life extension with manufacturing feasibility
3Stability of the object's composition
If PCBM variants are used to suppress pre-aggregation, then performance stability is improved, but loss of substance increases due to additional components
Solution Approach 1:
The invention uses small amounts of PCBM variants (typically 5-20 wt% of the total acceptor content) as sacrificial stabilizing agents. These additives are consumed during the stabilization process by suppressing pre-aggregation and maintaining morphological stability, but their small required quantity minimizes material loss while achieving significant performance stability improvements
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 use of highly miscible PCBM variants significantly reduces the aging of polymer solar cell ink, maintaining performance and stability even after 20 days, compared to binary blends which show substantial degradation within a few days.
Implementation Method 1
The use of highly miscible PCBM variants significantly reduces the aging of polymer solar cell ink, maintaining performance and stability even after 20 days
Implementation Method 2
maintaining electron percolation
Data Source
AI summary
A polymer solar cell ink for organic solar cell (OSC) devices is provided. The polymer solar cell ink includes at least one solid state additive. The polymer solar cell ink further includes a donor polymer. The polymer solar cell ink further includes a nonfullerene acceptor (NFA).