研究目的
Investigating the impact of fullerene side chain functionalization with thiophene and carbazole groups on the device properties of bulk-heterojunction polymer:fullerene solar cells.
研究成果
The study demonstrated that the chemical modification of N-methyl-fulleropyrrolidine acceptors with thiophene and carbazole moieties can be extended, but OPV devices based on these novel fullerene acceptors performed worse than PC71BM-based reference devices. The structural and energetic heterogeneity present in the isomer mixture of C70-fulleropyrrolidines was found to be detrimental to device performance, highlighting the need for regioselective synthetic pathways.
研究不足
The study found that fulleropyrrolidines based on C60 produced better devices than those based on C70, attributed to the detrimental effect of structural and energetic disorder in C70-based fullerenes. The surface morphology of the photoactive layer did not directly correlate with photovoltaic performance.
1：Experimental Design and Method Selection:
The study involved the synthesis of eight novel N-methyl-fulleropyrrolidine acceptors with thiophene and carbazole substituents and their testing in polymer solar cells based on PffBT4T-2OD. The photovoltaic performance was evaluated through device fabrication and characterization.
2：Sample Selection and Data Sources:
The materials used included the conjugated polymer PffBT4T-2OD as donor and C60 or C70 fulleropyrrolidines as acceptors. The fulleropyrrolidines were synthesized using the Prato methodology.
3：List of Experimental Equipment and Materials:
Equipment included a Bruker Avance 300 or 500 spectrometer for NMR spectroscopy, an Autolab PGSTAT302N potentiostat for cyclic voltammetry, a Shimadzu UV-2501PC spectrophotometer for absorption spectroscopy, and a Molecular Imaging PicoLE AFM for atomic force microscopy.
4：Experimental Procedures and Operational Workflow:
The fulleropyrrolidines were synthesized, characterized, and then used to fabricate OPV devices with a standard structure ITO/PEDOT:PSS/Active layer/Ca/Al. The devices were characterized using a Newport-Oriel 96000 AM 1.5 Global solar simulator.
5：5 Global solar simulator.
Data Analysis Methods:
5. Data Analysis Methods: The data was analyzed to determine the photovoltaic performance of the devices, including power conversion efficiencies (PCE), open-circuit voltage (VOC), fill factor (FF), and short-circuit current density (JSC).
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