研究目的
Investigating the effect of pendant group engineering on naphthodithiophene-based small molecule donors for achieving efficient organic solar cells with high fill factor.
研究成果
The hexyl-substituted NDT molecule (NDT-Hex) demonstrated superior morphological tunability, leading to high fill factors and power conversion efficiencies in both fullerene and non-fullerene based solar cells. This work provides a feasible method for achieving efficient organic solar cells with high fill factor through pendant group engineering.
研究不足
The study is limited to NDT-based small molecule donors and their blends with PC71BM and NBDTP-Fout. The morphological tunability and its impact on device performance may vary with other material systems.
1：Experimental Design and Method Selection:
Three NDT-based small molecules with different substituents were synthesized via Stille-coupling. Their photovoltaic effects were investigated through optical absorption, electronic energy levels, blend morphology, carrier mobility, and photovoltaic performance.
2：Sample Selection and Data Sources:
The study focused on three NDT molecules with hexyl-, null, and fluorene substituents. Data were collected from UV-vis absorption spectra, cyclic voltammetry, thermogravimetric analysis, and device performance measurements.
3：List of Experimental Equipment and Materials:
AFM for morphology analysis, UV-vis spectrometer for optical absorption, cyclic voltammetry for electrochemical energy levels, and solar simulators for photovoltaic performance.
4：Experimental Procedures and Operational Workflow:
The molecules were synthesized, characterized, and then used to fabricate BHJ solar cells. The devices were optimized through solvent vapor annealing (SVA) and electron transporting layer (ETL) selection.
5：Data Analysis Methods:
The performance of solar cells was analyzed through J-V curves, EQE measurements, and charge carrier mobility measurements via SCLC method.
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