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1

Effects of Al doping on the morphology of ZnO nanowires and the properties of dye-sensitized solar cells

Wang Yanxiang, Li Jing, Sun Jing

Materiały Ceramiczne

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2019

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T. 71, nr 4

334--340

EN

ZnO nanowire photoanodes were prepared by a simple chemical bath method. The influence of doping Al into ZnO seed layer, dipping times of seed layers and the growth times of ZnO nanowires on the morphology of ZnO nanowires and photoelectric performance of dye-sensitized solar cells were mainly investigated. The results showed that when the ZnO seed layer was doped with 9 at.% Al, both dipping times of seed layer solution and growth times of films were 9; ZnO photoanodes with nanowires and nanosheets composite structure were obtained. The length of the ZnO nanowires reached about 15μm. The power conversion efficiency, open circuit voltage, short-circuit photocurrent density and fill factor of the corresponding cells were 2.36%, 0.66 V, 5.28 mA•cm-2, and 0.62, respectively.

PL

Fotoanody zbudowane z nanodrutów ZnO zostały przygotowane prostą metodą kąpieli chemicznej. Badano głównie wpływ domieszkowania Al warstwy zarodkowej ZnO, czasu zanurzenia warstw zarodkowych i czasu wzrostu nanodrutów ZnO na morfologię nanodrutów ZnO i parametry fotoelektryczne ogniw słonecznych uświatłoczulonych barwnikiem. Wyniki pokazały, że gdy warstwa zaszczepiająca ZnO była domieszkowana 9% at. Al, zarówno czasy zanurzania w roztworze zaszczepiającym warstwę, jak i czasy wzrostu filmów wynosiły 9; otrzymano wówczas fotoanody ZnO z nanodrutami i strukturą kompozytową nanoskładników. Długość nanodrutów ZnO osiągnęła około 15 μm. Efektywność konwersji mocy, napięcie w obwodzie otwartym, gęstość zwarciowa fotoprądu i współczynnik wypełnienia odpowiednich ogniw wynosiły odpowiednio 2,36%, 0,66 V, 5,28 mA•cm-2 i 0,62.

2

The influence of reduced graphene oxide on the structure of the electrodes and the properties of dye-sensitized solar cells

Dobrzański L. A., Prokopiuk vel Prokopowicz M.

Archives of Materials Science and Engineering

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2016

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Vol. 77, nr 1

12--30

EN

Purpose of the paper: The aim of the research is to investigate the influence of the structure and chemical composition of the surface layers containing reduced oxide graphene on the properties of dye-sensitized solar cells, and to determine the correlation between the morphology and physicochemical properties of reduced graphene oxide and the electrical and optical properties of dye-sensitized solar cells, which will result in the desired effects reducing production costs and increasing the efficiency of dye cells. Design/methodology/approach: Complete manufacturing technology of dye-sensitized solar cells included the selection of the conditions of the thermal reduction of graphene oxide, the development of manufacturing technology of photoanode with and without reduced graphene oxide, the development of manufacturing technologies of counter electrodes with the reduced graphene oxide and the production of dye-sensitized solar cells by combining photoanode and counter electrode and filling the space between them by the electrolyte. Findings: A reduced graphene oxide layers applied to a glass substrate with transparent conductive oxide, used as a counter electrode and photoanode effect on reducing the degree of recombination and increasing electrochemical properties, which makes them important factors in increasing the efficiency of photovoltaic cells and reduce their manufacturing costs. Research limitations/implications: Dye-sensitized solar cells research develop in the direction to increase their efficiency and reduce manufacturing costs, among others, by modifying the chemical composition and structure of the main components: photoanode and counter electrode. Using one of the most expensive materials in the world - a platinum as a catalytic layer causes a significant increase in production costs. For this reason, it is important to search for new materials that can replace the expensive platinum. Practical implications: Developed in this work producing technology of photoanode and the counter electrode containing reduced graphene oxide is an attractive alternative to dye-sensitized solar cell by reducing the manufacturing cost by eliminating costly layer of platinum while maintaining a relatively high efficiency, high transmittance and low resistance of charge transfer at the interlayer counter electrode/electrolyte. Originality/value: In the paper, the reduced graphene oxide was applied as both photoanode and the counter electrode in dye-sensitized solar cells.

3

Investigation of sol-gel processed CuO/SiO2 nanocomposite as a potential photoanode material

Tenkyong T., Bachan N., Raja J., Kumar P. N., Shyla J. M.

Materials Science Poland

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2015

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Vol. 33, No. 4

826--834

EN

Synthesis and characterization of a highly efficient photoconductive nanocomposite comprising of two common metal oxides: copper oxide (CuO) and silicon dioxide (SiO2>/sub>) are being reported in this paper. The CuO/SiO2 nanocomposite has been synthesized using a cost-effective and facile sol gel route. The structural, chemical and optical properties of the prepared samples have been studied using various characterization techniques. The UV-Vis analysis revealed better absorption in the case of the nanocomposite as compared to its parent materials. X-ray diffraction (XRD) analysis has been employed to determine the structural formation of the nanocomposite and the crystallite size with the use of Scherrer's formula. The photo conductivity study of the sample showed enhanced photocurrent in the case of nanocomposite as compared to its single components, thus, presenting it as a potential candidate for solar cell applications, especially as photoanode material in the dye-sensitized solar cells (DSSC).

4

Photoresponse of Undoped and W-Doped TiO2

Radecka M., Sobaś P., Trenczek A., Rękas M.

Polish Journal of Chemistry

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2004

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Vol. 78 / nr 10

1925-1934

EN

Undoped andW-doped polycrystalline TiO2 were investigated. The kinetics of recombination processes has been studied. The flat band potential of TiO2 was determined (-0.11 V in respect to saturated calomel electrode, at pH = 7.8). Basing on the photocurrent experiments, the effect of Wconcentration on solar energy conversion efficiency was discussed. It was found, that addition ofWleads to an increase of solar-to-hydrogen energy efficiency. The maximum energy conversion efficiency has been observed for voltage bias ca 0.65 V. The highest energy conversion efficiency has been observed for TiO2 doped with 0.1 at % W.