研究目的
Investigating the effect of a high-viscosity polymeric additive on the electron- and hole-transfer dynamics in all-polymer organic photovoltaic blends.
研究成果
The addition of a viscosity additive promotes hole transfer in all-polymer photovoltaic blends by modifying the dielectric screening, while the electron transfer remains nearly unchanged. This suggests a new strategy for designing high-performance flexible organic photovoltaic devices by manipulating the dielectric environment.
研究不足
The study focuses on a specific model system of an all-polymer blend, and the findings may not be directly applicable to other systems. The effect of viscosity additives on the morphology of the blends was not extensively studied.
1：Experimental Design and Method Selection:
Ultrafast transient absorption spectroscopy was used to investigate the charge generation dynamics in the blend films with and without adding PDPS.
2：Sample Selection and Data Sources:
The samples were all-polymer blends consisting of a polymer donor poly[6-?uoro-2,3-bis(3-octyloxyphenyl)quinoxaline-5,8-dyl-alt-thiophene-2,5-diyl] (TQ-F) and a naphthalene diimide-based polymer acceptor poly{[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} (N2200).
3：0). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Optical parametric amplifier (OperA Solo, Coherent) for generating wavelength-tunable pump pulses, and a white-light supercontinuum light beam for probing.
4：Experimental Procedures and Operational Workflow:
The film samples were excited with wavelength-tunable pump pulses and probed with a white-light supercontinuum light beam covering the visible or near-infrared range.
5：Data Analysis Methods:
The dynamics of photocharge generation was analyzed to understand the effect of the additive on the charge generation dynamics.
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