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Synteza matrycowa kompozytów tlenku cynku stosowanych w ogniwach słonecznych uczulanych barwnikiem

Zhao N., Zhang C., Zhang P.

Przemysł Chemiczny

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2018

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T. 97, nr 2

195--199

PL

Tlenek cynku jest obiecującym materiałem do budowy anod ze względu na możliwość uzyskiwania go w postaci różnych nanostruktur oraz doskonałą ruchliwość elektronów. W celu poprawy działania ogniw fotowoltaicznych otrzymano nanostruktury ZnO i zastosowano je w elektrodach półprzewodnikowych. Jako podłoże warstwy ZnO zastosowano szkło z tlenku cyny domieszkowanego fluorem FTO (fluorine-doped tin oxide). Po wyżarzaniu pokryto je warstwą składającą się z mikrokulek polistyrenowych wytworzonych in situ metodą polimeryzacji wolnorodnikowej. Zarodki ZnO hodowano w mieszaninie azotanu cynku i heksametylenotetraaminy w celu wytworzenia różnych typów nanostruktur ZnO (struktura siatki 3D i struktura nanodrutu-nanocząstki) o dużej powierzchni właściwej. Warstwę kompozytową uczulono barwnikiem N719 i zastosowano w ogniwach słonecznych. Uzyskano efektywność konwersji energii 3,91%.

EN

ZnO was deposited from Zn(OAc)2 soln. on F-doped SnO glass substrate by spin coating. After the procedure was repeated 4 times, the layer was annealed at 400°C for 1 h and covered with template layer consisting of polystyrene microspheres in-situ produced by free radical emulsion polymerization. The seed layer was grown in the mixt. of Zn(NO3)2 and hexamethylenetetramine to produce ZnO of nanowire-nanoparticle structures with high sp. surface area. The template layer was then removed by heating at 500°C for 1 h under formation of ZnO nanostructures. Di(tetrabutylammonium)cis-bis(isothiocyanato)bis(2,2’- bipyridyl-4,4’-dicarboxylato)ruthenium(II) (N719 dye) was then deposited from its soln. on the composite surface and sensitized in dark for 1 h. The product was characterized by X-ray diffractometry, elec. impedance spectroscopy and scanning electron microscopy and then successfully used as a semiconductor electrode in a solar cell of improved performance.

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ZnO nanocrystalline powder prepared by sol-gel method for photoanode of dye sensitized solar cells application

Szindler M., Szindler M. M., Boryło P.

Journal of Achievements in Materials and Manufacturing Engineering

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2018

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Vol. 88, nr 1

12--17

EN

Purpose: The article presents the results of research on ZnO nanopowder prepared using sol-gel method that is the easy process enabling us to control shape and size of particles The purpose of this article is to synthesized ZnO nanostructures by sol-gel method and characterized them for use in dye sensitized solar cells. Design/methodology/approach: Zinc oxide nanopowder was synthesized by using zinc acetate dehydrate as a precursor. The prepared nanopowder has been subjected to structural analysis using a transmission electron microscope (TEM). Scanning Electron Microscopic (SEM) images were taken with a Zeiss Supra 35. Qualitative studies of chemical composition were also performed using the Energy Dispersive Spectrometer (EDS). The structure of zinc oxide was investigated by X-ray crystallography The absorbance of zinc oxide layers with and without dye were measured by Thermo Scientific Evolution 220 spectrophotometer equipped with a xenon lamp in the wavelength range from 190 nm to 1100 nm. Findings: Sol-gel method allows the formation of uniform nanoparticles of zinc oxide. The nanoparticles have been successfully used in photoelectrode of dye sensitized solar cell. The light harvesting efficiency of the electrode it remains in a wide spectral range above 85%, which gives better results than in the case of titanium dioxide. Research limitations/implications: The next step in the research will be to investigate the ZnO/NiO composite on the properties of the photoelectrode of dye sensitized solar cell. Practical implications: he unique properties of produced ZnO nanostructural materials have caused their interest in such fields as medicine, transparent electronics and photovoltaics. Originality/value: The ZnO nanoparticles were prepared using sol-gel method and then effectively used in the photoanode of dye sensitized solar cell.

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Photovoltaic performance of dye-sensitized ZnO solar cell based on Eosin-Y photosensitizer

Suri P., Panwar M., Mehra R. M.

Materials Science Poland

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2007

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Vol. 25, No. 1

137--144

EN

The paper reports on the fabrication and characterization of dye sensitized solar cells using ZnO due to its stability against photo-corrosion and photochemical properties similar to TiO2. Thin films of nanocrystalline ZnO and Al-doped ZnO (AZO) were deposited on transparent conducting oxide glass using glass rod spreading method. Both doped and undoped ZnO films were found to be polycrystalline in nature. The ZnO electrode was dye sensitized by using an organic dye, Eosin-Y. The maximum quantum efficiency appears at the wavelength of 550 nm in both cases. However, the maximum quantum efficiency is higher (12%) in the case of ZnO cell electrode than AZO (7%) cell. The electric energy conversion efficiency was found to be 1.43% and 0.6% for undoped ZnO and Al-doped ZnO electrodes respectively. The lower conversion efficiency of the Al-doped ZnO solar cell could be attributed to lower injection efficiency due to less porosity in dye sensitized Al-doped ZnO electrode.