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Electroluminescence of n-Zn1-xMgxO/ZnO/p-Zn1-xMgxO Heterostructures Grown on Si Substrates
Sh. U. Yuldashev,T. W. Kang,R. A. Nusretov,I. V. Khvan,P. K. Khabibullaev,Y. K. Yeo,R. L. Hengehold 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
The n-Zn0.9Mg0.1O/ZnO/p-Zn0.9Mg0.1O heterojunction structures were grown on single-crystal p-type Si (100) substrates by using a simple process of ultrasonic spray pyrolysis. Aqueous solutions of zinc acetate, magnesium acetate, and ammonium acetate were used as the sources of Zn, Mg, and N, respectively. P-type conductivity was observed for the nitrogen-doped ZnO and Zn0.9Mg0.1O films. A distinct visible electroluminescence was observed at room temperature from the n-Zn0.9Mg0.1O/ZnO/p-Zn0.9Mg0.1O heterojunction structures under forward bias conditions.
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.