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- W2241519046 abstract "Exploitation of the incoming solar energy is more than adequate to sufficiently meet the energy demands of the modern world. Photovoltaics constitute devices that convert solar energy to electricity. Among them, silicon photovoltaics have been extensively studied, although an emphasis has been given in the last decades towards third generation photovoltaics, such as dye sensitized solar cells (DSSCs). DSSCs are made of materials based on nanostructured semiconductors as photoanodes, with low cost and transparency. The main semiconductor that has been widely studied is titanium dioxide (TiO2), however the rate of electron recombination blocks the extensively high conversion efficiency. Many attempts have been made in order to suppress these losses and improve electron transport. Remarkable efforts led to doping the electrodes or combining specific semiconducting metal oxides with desirable band gaps in order to improve the direct electron transport, and eliminate electron recombination. At the present work, we demonstrate a combination of semiconductors (TiO2, In2O3, with band gaps about 3.2eV and 3eV respectively), where In2O3 acts as a barrier layer that suppresses the back reaction (recombination) and accelerates the electron transport, leading to higher charge collection efficiency. The photoanode was fabricated by TiO2 underlayer and In2O3 top layer due to the deeper conduction band of TiO2 than that of In2O3. Solar cells were fabricated combining these photoanodes with quasi solid-state electrolyte based on I−/I3− redox couple. The structural properties of the films with combined semiconductors were examined with porosimetry methods and scanning electron microscopy. The performance of the DSSCs with negative photoelectrodes made with combined TiO2-In2O3 oxides proved to be higher compared with those obtained for one semiconductor. 17% maximum increase to the overall performance was monitored for DSSCs made with TiO2-In2O3 coupled semiconductors in contrast to the pure TiO2 films." @default.
- W2241519046 created "2016-06-24" @default.
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- W2241519046 date "2015-07-01" @default.
- W2241519046 modified "2023-09-26" @default.
- W2241519046 title "Quasi solid-state photoelectrochemical cells combining nanocomposite semiconductors" @default.
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- W2241519046 doi "https://doi.org/10.1109/nano.2015.7388892" @default.
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