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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.
Orthogonal Processing: A Novel Photolithographic Patterning Method for Organic Electronics
Lee, Jin-Kyun,Taylor, Priscillia G.,Zakhidov, Alexander A.,Fong, Hon Hang,Hwang, Ha Soo,Chatzichristidi, Margarita,Malliaras, George G.,Ober, Christopher K. The Conference of Photopolymer Science and Technol 2009 フォトポリマ-懇話會誌= Journal of photopolymer science and t Vol.22 No.5
<P>Organic electronics is an extensively studied subject opening new horizons in electronics technology. It has attracted great attention as a technology to enable flexible electronic devices through solution processing of organic and polymeric materials. However, patterning of organic materials to construct device components still remains one of the major hurdles to be overcome due to problems with chemical processing. Fundamentally this challenge originates from the limited number of options regarding orthogonal solvents. Recently, we have identified supercritical carbon dioxide (scCO<SUB>2</SUB>) and segregated hydrofluoroethers (HFEs) as universal, non-damaging solvents for most non-fluorinated polymeric materials. These unconventional solvents expand processing options from the two-dimensional plane to three-dimensional space by drawing another orthogonal axis. Taking advantage of those noble solvents and fluorinated photoresists, we were able to make patterns of functional organic materials photolithographically. Furthermore, our orthogonal processing method has been applied to the fabrication of a patterned polymer light-emitting device in scCO<SUB>2</SUB> and an organic thin-film transisotor in HFEs.</P>
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.