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Abbotto, Alessandro,Sauvage, Frederic,Barolo, Claudia,De Angelis, Filippo,Fantacci, Simona,Graetzel, Michael,Manfredi, Norberto,Marinzi, Chiara,Nazeeruddin, Mohammad K. Royal Society of Chemistry 2011 Dalton transactions Vol.40 No.1
<P>The first example of a heteroarylvinylene π-conjugated quaterpyridine Ru(<SMALL>II</SMALL>) sensitizer (N1044) was synthesized and used in dye-sensitized solar cells; the dye has an effective panchromatic absorption band, covering the entire visible spectrum up to the NIR region, and superior electrochemical characteristics (HOMO/LUMO and bandgap energies) with respect to previous representative Ru(<SMALL>II</SMALL>) bi- and quaterpyridine sensitizers. A record IPCE curve ranging from 360 to 920 nm has been measured with a maximum of 65% at 646 nm and still 33% efficiency at 800 nm; this leads to substantially increased photocurrent (19.2 mA cm<SUP>−2</SUP>) when compared to the prototype N719 Ru(<SMALL>II</SMALL>) sensitizer.</P> <P>Graphic Abstract</P><P>The first heteroarylvinylene π-conjugated quaterpyridine Ru(<SMALL>II</SMALL>) sensitizer is reported; the dye has an effective panchromatic response through the visible and NIR, delivering high photocurrent when employed in dye-sensitized solar cells. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0dt01190h'> </P>
High efficiency electrospun TiO2nanofiber based hybrid organic-inorganic perovskite solar cell
Dharani, Sabba,Mulmudi, Hemant Kumar,Yantara, Natalia,Thu Trang, Pham Thi,Park, Nam Gyu,Graetzel, Michael,Mhaisalkar, Subodh,Mathews, Nripan,Boix, Pablo P. The Royal Society of Chemistry 2014 Nanoscale Vol.6 No.3
The good electrical and morphological characteristics of TiO2 nanofibers and the high extinction coefficient of CH3NH3PbI3 perovskite are combined to obtain a solar cell with a power conversion efficiency of 9.8%. The increase of the film thickness dramatically diminishes the performance due to the reduction in porosity of the TiO2 nanofiber framework. The optimum device (similar to 413 nm film thickness) is compared to a planar device, where the latter produces higher V-oc but lower J(sc), and consequently lower efficiency at all measured light intensities.
Hu, Yelin,Boudoire, Florent,Hermann-Geppert, Iris,Bogdanoff, Peter,Tsekouras, George,Mun, Bongjin Simon,Fortunato, Giuseppino,Graetzel, Michael,Braun, Artur American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.6
<P>The origin, the nature, and the electronic structure of surface defects causing surface states on metal oxides and their role in solar water splitting have been under scrutiny for several decades. In the present study, the surface of hematite films is treated with an oxygen plasma and then subject to a detailed investigation with electroanalytical methods and element orbital specific X-ray spectroscopy. We observe a systemic variation of photoelectrochemical properties with oxygen treatment time. Fe 2p and O is core level X-ray photoelectron spectra and resonant valence band photoemission at the Fe 3p edge reveal the filling of prevalent oxygen vacancies with concomitant oxidation of Fe2+ to Fe3+ upon the oxygen treatment. The dc bias dependent impedance spectra confirm how a prevalent capacitive surface state, which evolves parallel with the photocurrent onset potential, becomes diminished upon oxygen treatment. Surface states of iron induce higher reactivity toward water oxidation than oxygen surface states. correlation between oxygen vacancy filling, concentration of surface states, and photocurrent density in the course of treatment confirms that the surface defects are of a capacitive nature and that the onset of water splitting can be considered as a result of dielectric breakdown in an interfacial hydroxide layer between photoanode and water.</P>