研究目的
Investigating the effects of fluorination and thermal annealing on charge recombination processes in polymer bulk-heterojunction solar cells.
研究成果
Fluorination and thermal annealing significantly affect the photovoltaic performance of polymer bulk-heterojunction solar cells by influencing charge recombination processes and the nature of donor–acceptor interfacial charge transfer states. The fluorinated polymer exhibited higher performance due to enhanced aggregation, while thermal annealing improved VOC and FF at the expense of a slight JSC loss.
研究不足
The study is limited to the specific polymers PBDT4TBT and PBDT4T?BT and their blends with [70]PCBM. The effects of fluorination and thermal annealing may vary with different materials or device architectures.
1：Experimental Design and Method Selection:
The study involved the synthesis of two new donor–acceptor copolymers, PBDT4TBT and PBDT4T?BT, via a Stille coupling polymerization reaction. The photovoltaic properties were evaluated in bulk-heterojunction solar cells with [70]PCBM.
2：Sample Selection and Data Sources:
The polymers were characterized using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), UV-vis-NIR spectroscopy, cyclic voltammetry, and gel permeation chromatography (GPC).
3：List of Experimental Equipment and Materials:
Equipment included a Bruker spectrometer for NMR, a TA Instruments TGA Q500 for TGA, a Perkin Elmer Lambda 1050 spectrophotometer for UV-vis-NIR spectroscopy, and a Keithley 2400 source meter for J–V characteristics.
4：Experimental Procedures and Operational Workflow:
Solar cells were fabricated using a conventional device configuration and characterized under simulated AM
5：5G illumination. Morphological characterization was performed using AFM, TEM, and 2D GIWAXS. Data Analysis Methods:
Charge carrier recombination was analyzed using light intensity dependence studies, and the nature of charge transfer states was explored through EQE and electroluminescence measurements.
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