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Erkin Zakhidov,Abdumutallib Kokhkharov,Vakhobjon Kuvondikov,Sherzod Nematov,Rafael Nusretov 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.7
The efficiency of solar radiation conversion in a model system of artificial photosynthesis, the porphyrin-fullerene assembly, is analyzed. A study of the optical absorption spectra of the porphyrin and the fullerene molecules, as well as their assembly in organic solutions, made it possible to estimate the energy efficiency of the conversion. Numerical values of the energy efficiency, defined as the fraction of the light quantum energy converted to the chemical potential of separated charges, are calculated for low- and high-concentration solutions of such a supramolecular system. The possibility of the efficient utilization of long-wavelength solar radiation in the high-concentration porphyrin-fullerene assembly solution in toluene and benzene is shown. In the photovoltaic system consisting of such a supramolecular active element, a thin ZnO film with a nanostructured surface may be introduced as a secondary acceptor of electrons from fullerene molecules. An enhancement of the transformation of separated charges of the porphyrin-fullerene assembly into electrical current by means of the ZnO film deposited on the surface of the anode electrode in such a heterogenic photovoltaic unit is proposed.
S. A. Bakhramov,A. M. Kokhkharov,E. A. Zakhidov,U. K. Makhmanov,Sh. P. Gofurov 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10
The effect of cluster formation in a fullerene mixture C60/70 (D5h−C70 − 95 mass percent andIh−C60 − 5 mass percent) solution in toluene on the electronic properties and the infrared absorptionspectra during long-term (60 days) storage under isotermic conditions is studied. The features ofthe structure of (C60/70)N clusters have been studied using high-resolution transmission electronmicroscopy and a fractal mechanism is proposed for the formation of large (291.4 nm) stableclusters, which may contain up to 19698 molecules of C70 and 1036 molecules of C60. Theprecise values of the nonlinear optical susceptibility (3)xyyx (!) of the C60/70 solutions for differentlaser beam polarizations (in the range of ellipticities = 0.1 − 0.8) are determined. The physicalmechanisms of the laser-induced optical activity of a C60/70 solution in toluene are discussed.