研究目的
Investigating the effect of multiwall carbon nanotubes grafted with poly(3-dodecylthiophene) (CNT-graft-PDDT) on the performance of poly(3-hexylthiophene) (P3HT):phenyl-C61-butyric acid methyl ester photovoltaic cells.
研究成果
The incorporation of CNT-graft-PDDT into the matrix of P3HT:PCBM photovoltaic cells enhances the organization of the polymer phase, resulting in crystallite size increment, redshifted absorption characteristics, and charge mobility improvement. Over 380% PCE improvement was achieved by incorporating 0.5 wt% CNT-graft-PDDT into blend films, attributed to minimized bimolecular recombination within the active layer at this concentration.
研究不足
The study is limited by the technical constraints of the experimental setup and the potential for optimization in the concentration of CNT-graft-PDDT to achieve higher efficiency.
1：Experimental Design and Method Selection
The study involved the preparation of photoactive layers by dispersing CNTs-grafted-PDDT in 1,2-dichlorobenzene with different concentrations (0.05, 0.1, 0.5 and 1 wt%) with the aid of a sonication bath, for 2 h. The P3HT and PCBM were dissolved in 1:1 weight ratio, and the overall concentration was 20 mg/mL using the CNT solutions.
2：Sample Selection and Data Sources
The active layers were spin-coated onto the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) modified indium tin oxide (ITO, sheet resistance of 10–15 Ω/square) on the glass to yield 200 nm films.
3：List of Experimental Equipment and Materials
Lambda 750 UV–Vis spectrometer, AFM Nanoscope, CMOS flat panel X-ray detector (C9728DK), Newport computer-controlled measurement unit.
4：Experimental Procedures and Operational Workflow
To complete the device fabrication, the LiF interfacial layer (1 nm) and Al electrode (100 nm) were thermally evaporated onto the device under the vacuum below 2 × 10?4 Pa. The current density–voltage (J–V) characterizations were performed by a computer-controlled measurement unit from Newport under the illumination of AM1.5G, 100 mW/cm2.
5：Data Analysis Methods
The photophysics of hybrid systems were studied by means of the electrochemical impedance spectroscopy as well as Voc and Jsc dependent on the light intensity.
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