Fullerene

About: Fullerene is a research topic. Over the lifetime, 12723 publications have been published within this topic receiving 359173 citations.

Formation of high mass carbon cluster ions from laser ablation of polymers and thin carbon films

Abstract: Three materials were studied by laser ablation/Fourier transform mass spectrometry, using 266 nm laser radiation: a copolymer of ethylene and tetrafluoroethylene (ETFE), polyphenylene sulfide (PPS), and a diamond‐like carbon film (DLC). In each case, positive ion mass spectra exhibit primarily even‐numbered, high mass carbon clusters (‘‘fullerenes’’) of the type previously reported for graphite ablation. In the case of ETFE, a large C+60 peak (‘‘buckminsterfullerene’’) was observed. The polymer spectra showed a strong dependence on the number of laser pulses on one spot and the laser power density. For ETFE, the fullerene ion relative intensity first increases and then decreases as a function of the number of laser pulses. For the DLC film, fullerenes are observed with a single laser pulse on a fresh spot of the sample. The results are interpreted in terms of a gas phase growth model for the fullerene ion formation.

Novel bis-C60 derivative compared to other fullerene bis-adducts in high efficiency polymer photovoltaic cells

Abstract: We report the application of novel mono- and bis-o-quino-dimethane C60 (oQDMC60) adducts in bulk heterojunction photovoltaic devices. When blended with poly(3-hexylthiophene), the fullerene adducts presented here have an enhanced open-circuit voltage of 640 mV and 820 mV, while preserving high short-circuit current and fill factor, resulting in efficiencies of 4.1% and 5.2%, respectively. Detailed assessment of material properties relevant to photovoltaic devices such as energy levels, charge carrier mobility, absorption and solubility further complements the evaluation. Increased fullerene solubility hindering phase segregation in blends with bis-oQDMC60 has been circumvented by an in-depth morphology optimization assisted by absorption spectroscopy, X-ray reflectivity and atomic force microscopy. This optimized preparation could also serve as a guide for implementation of similar fullerene derivatives. Furthermore, we compare bis-oQDMC60 to previously reported fullerene bis-adducts to provide insight into this emerging class of materials.

Dendritic fullerenes; a new approach to polymer modification of C60

Abstract: A new route for the preparation of polymer modified fullerences by the cycloaddition reaction of azides is demonstrated and the physical properties of the dendritic fullerence obtained show influences from both the parent dendrimer and C60

Origin of Reduced Bimolecular Recombination in Blends of Conjugated Polymers and Fullerenes

Abstract: Bimolecular charge carrier recombination in blends of a conjugated copolymer based on a thiophene and quinoxaline (TQ1) with a fullerene derivative ((6,6)-phenyl-C-71-butyric acidmethyl ester, PC71 ...