研究目的
Investigating the role of semiconducting single-walled carbon nanotubes (SWNTs) in the exciton dynamics of photovoltaic blends with the polymer PTB7 and the fullerene derivative PCBM.
研究成果
The study demonstrated an active role of the nanotube in the excitonic photodynamic of photovoltaic blends, highlighting evidence of ultrafast SWNTs → PTB7 hole transfer. These findings can be useful for the optimization of photovoltaic nanocomposites integrating SWNTs as active material.
研究不足
The relatively high level of complexity of these blends and the strong dependency of their nanomorphology on the intrinsic structural properties of the constituent materials and on a number of process parameters hinder a complete and reliable characterization of these functional nanocomposites.
1：Experimental Design and Method Selection:
The study employed ultrafast pump-probe spectroscopy to investigate the photophysics of three sample configurations with different interfacial arrangements between PTB7:PCBM blends and nanotubes.
2：Sample Selection and Data Sources:
The samples included (6,5) SWNT films deposited below or on top of the bulk heterojunction layer and a SWNT:PTB7:PCBM heterojunction blend.
3：List of Experimental Equipment and Materials:
A Perkin Elmer spectrophotometer Lambda 1050 WB for steady state absorption spectra and a Ti:Sapphire amplified laser system for ultrafast differential transmission measurements.
4：Experimental Procedures and Operational Workflow:
The active layer was spin-coated at 1200 rpm, yielding a thickness of about 80 nm. Ultrafast differential transmission measurements were performed with excitation pulses obtained with second harmonic generation or by optical parametric amplification.
5：Data Analysis Methods:
Chirp-free transient differential transmission (ΔT/T) was collected by using an optical multichannel analyser (OMA) with a dechirping algorithm.
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