研究目的
Investigating the effect of changing the alky chain position on the molecular stacking and photovoltaic performance of all-small-molecule organic solar cells (ASM OSCs).
研究成果
The study demonstrates that fine-tuning the molecular structure, specifically the alky chain position, can significantly improve the photovoltaic performance of ASM OSCs. The BIHTR-based devices achieved a remarkable PCE of 12.3%, highlighting the importance of molecular planarity and optimized phase separation in enhancing device performance.
研究不足
The study focuses on the effect of alky chain position on molecular stacking and photovoltaic performance, but other factors such as solvent effects, processing conditions, and device architecture could also influence the results. The scalability and long-term stability of the devices were not addressed.
1：Experimental Design and Method Selection:
The study involved designing and synthesizing two conformation isomerism small-molecule donors (BIHTR and BOHTR) with different alky chain positions to match a high-performance small-molecule nonfullerene acceptor (NFA), Y6. The photovoltaic properties were compared through device fabrication and characterization.
2：The photovoltaic properties were compared through device fabrication and characterization.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The samples were the synthesized small-molecule donors BIHTR and BOHTR, and the acceptor Y6. Data were acquired through various characterization techniques including UV–vis absorption spectroscopy, cyclic voltammetry, and device performance testing.
3：Data were acquired through various characterization techniques including UV–vis absorption spectroscopy, cyclic voltammetry, and device performance testing.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Instruments used include a Bruker AFM, Talos F200S electron microscopy, and GIWAXS at the PLS-II 6A U-SAXS beamline. Materials include the synthesized small-molecule donors and acceptor, PEDOT:PSS, and Phen-NaDPO.
4：Experimental Procedures and Operational Workflow:
The devices were fabricated with a conventional architecture, optimized through adjusting the D/A ratio, using additives, and thermal annealing treatment. Characterization included AFM, TEM, GIWAXS, and photovoltaic performance testing.
5：Data Analysis Methods:
Data were analyzed using Gaussian 09 for DFT calculations, and photovoltaic performance was evaluated through J–V characteristics and EQE measurements.
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