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Registration Number

0213U004617, 0113U005302 , R & D reports

Title

Multi-layered metal - semiconductor nanostructures for efficient solar light harvesting

Head

Khalavka Yuriy Bogdanovych,

Registration Date

19-12-2013

Organization

Yuri Fedkovych Chernivtsi National University

Description

As a result of the investigation synthesis of metal nanostructures spherical decahedral , rod and prismatic shapes w with intense light absorption in the wavelength range 400 - 900 nm and semiconductor structures ( quantum dots and nanowires ) with absorption in the region 350-500 nm and photoluminescence in the range of 400 -700 nm were obtained. Cyclovolttametric CdTe nanocrystals stabilized with thioglycolic acid showed that this method can be effectively used to determine the energy gap, valence band and the conduction band of QD. It was figured out that the distance between the peaks of oxidation and reduction increases with decreasing size of CdTe QDs and corresponds to the band gap. Difference between potentials of peaks oxidation and reduction allow us to calculate the corresponding values of the valence band and the conduction band of CdTe quantum dots. Both fluorescent and electrochemical measurements showed - increase in temperature leads to a decrease in the band gap of the quantum effects due to increased restrictions. Using the method of mathematical planning we studies additive effect of the composition of Cd2 + - L-Cys - S2- optical properties of colloidal solutions of nanoparticles of CdS / L- Cysteine obtained in potentially oxidizing conditions in alkaline (pH = 9 , 11) environment, determined range of the stable solutions and correlation equations of obtained concentration dependence of the spectral characteristics of NPs (maximum wavelength and photoluminescence peak , the size of nanoparticles, quantum yield of photoluminescence, band gap , Stokes shift ).

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Буркут Володимир Ігорович
Копач Олег Вадимович
Крупко Олена Василівна
Наконечний Ігор Йосипович
Халавка Юрій Богданович
Щербак Лариса Павлівна