研究目的
To develop highly efficient electron donors based on 5,5′-bibenzothiadiazole (BBT) for organic solar cells, overcoming the limitations of benzothiadiazole (BT) based materials.
研究成果
The swivel-cruciform BBT based small molecules exhibit excellent solubility, thermostability, and photovoltaic performance, with a record power conversion efficiency of 7.21% for BBT based solar cells. The results highlight the potential of BBT as a building block for high-performance organic solar cells.
研究不足
The study focuses on the synthesis and initial photovoltaic performance of BBT based small molecules. Further optimization of device architecture and processing conditions may be required to achieve higher efficiencies.
1：Experimental Design and Method Selection:
Synthesis of two BBT based small molecule donors (DFTBTF and DCzTBTCz) with fluorene and carbazole as branches. Comparison with a linear BT based small molecule (L-DCzTBTCz).
2：Sample Selection and Data Sources:
Use of DFTBTF and DCzTBTCz as donor materials in bulk heterojunction solar cells with PC71BM as the acceptor.
3：List of Experimental Equipment and Materials:
Thermogravimetric analysis for thermal property, density functional theory (DFT) calculations for geometrical configuration and electron distribution, cyclic voltammetry (CV) for energy levels, X-ray diffraction (XRD) for molecular order, space charge limited current (SCLC) method for hole mobility, atomic force microscopy (AFM) and transmission electron microscopy (TEM) for morphology.
4：Experimental Procedures and Operational Workflow:
Fabrication of solar cells with a normal device structure of ITO/PEDOT:PSS/small molecules:PC71BM/LiF/Al using solution spin-coating process. Optimization of donor-to-acceptor ratio.
5：Data Analysis Methods:
Analysis of photovoltaic performance through current-density versus voltage (J-V) curves and external quantum efficiency (EQE) spectra.
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