研究目的
To investigate the impact of alkyl chain optimization on the performance of organic photovoltaic (OPV) cells, specifically focusing on the chlorinated nonfullerene acceptor (NFA) BTP-4Cl-BO and its derivatives.
研究成果
The optimization of alkyl chains on the edge of Y6-type molecules significantly improves the performance of OPV cells, with BTP-eC9 achieving a maximum PCE of 17.8%. The study highlights the importance of molecular structure optimization in enhancing photovoltaic performance.
研究不足
The study found that BTP-eC7 had poor solubility, limiting its application in device fabrication. The research suggests that further optimization of donor materials or device engineering could overcome these limitations.
1：Experimental Design and Method Selection
The study involved the synthesis of NFAs with optimized alkyl chains (BTP-eC9 and BTP-eC7) from BTP-eC11 to study their photovoltaic properties. The methodology included solubility tests, optical absorption measurements, GIWAXS for intermolecular packing analysis, and fabrication of OPV cells to evaluate performance.
2：Sample Selection and Data Sources
Samples included the synthesized NFAs (BTP-eC11, BTP-eC9, BTP-eC7) and their blend films with polymer donor PBDB-TF. Data were obtained from solubility tests, optical absorption spectra, GIWAXS patterns, and photovoltaic device measurements.
3：List of Experimental Equipment and Materials
Equipment used included GIWAXS for molecular packing analysis, atomic force microscopy (AFM) for morphology characterization, and photovoltaic device fabrication tools. Materials included the NFAs, polymer donor PBDB-TF, and solvents like chlorobenzene and chloroform.
4：Experimental Procedures and Operational Workflow
The workflow involved synthesizing NFAs with varying alkyl chain lengths, characterizing their physical and electronic properties, fabricating OPV devices, and evaluating their performance through J-V measurements and EQE spectra.
5：Data Analysis Methods
Data analysis included calculating Urbach energies from EQE spectra, determining electron mobilities from J-V curves, and analyzing GIWAXS patterns for molecular packing and coherence lengths.
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