研究目的
To improve the photovoltaic performance and processability of organic photovoltaic (OPV) cells by fine-modifying the flexible side chains of non-fullerene acceptors (NFAs) and exploring their applicability in large-area production technologies.
研究成果
The fine-modification of the flexible side chains of NFAs can significantly improve the photovoltaic performance and processability of OPV cells. The optimal NFA (BTP-4Cl-12) demonstrated a high PCE of 17% in spin-coated devices and maintained a high PCE of 15.5% in blade-coated devices, making it suitable for large-area production. This work provides important guidelines for the development of highly efficient OPV materials for commercialization.
研究不足
The study primarily focuses on the impact of side-chain modification on the performance of OPV cells and their applicability in large-area production. The scalability of the blade-coating method and the uniformity of the active layer over large areas are critical challenges that need further optimization.
1：Experimental Design and Method Selection:
The study involved the synthesis of new NFAs with modified side chains (BTP-4Cl-8, BTP-4Cl-12, BTP-4Cl-16) and their application in OPV cells. The devices were fabricated using both spin-coating and blade-coating methods to compare their performance.
2：Sample Selection and Data Sources:
The NFAs were synthesized with different alkyl side chains to study their impact on solubility and aggregation properties. The photovoltaic performance was evaluated based on current density-voltage (J-V) characteristics, external quantum efficiency (EQE), and electroluminescence (EL) quantum efficiency measurements.
3：List of Experimental Equipment and Materials:
The study utilized ultraviolet-visible (UV-vis) absorption spectroscopy, grazing-incidence wide-angle X-ray scattering (GIWAXS), atomic force microscopy (AFM), and photoinduced charge-carrier extraction in a linearly increasing voltage (photo-CELIV) for characterization.
4：Experimental Procedures and Operational Workflow:
The OPV cells were fabricated with a structure of ITO/PEDOT:PSS/PBDB-TF:NFA blend/PDINO/Al. The active layer thickness was varied to study its effect on photovoltaic characteristics.
5：Data Analysis Methods:
The data were analyzed to understand the relationship between the molecular structure of NFAs, their solubility, aggregation properties, and the resulting photovoltaic performance.
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