Nripan Mathews

Cette personne n’est plus à l’EPFL

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Publications associées (29)

Influence of 4-tert-Butylpyridine in DSCs with Co-II/III Redox Mediator

Michael Graetzel, Ulf Anders Hagfeldt, Nripan Mathews, Kazuteru Nonomura

The effect of TBP on Co(II/III) redox electrolyte was examined. Photocurrent of the device can be limited in electrolyte with high TBP concentration due to its viscous nature. The higher amount of TBP in electrolyte increases the viscosity of electrolyte a ...

American Chemical Society2013

Determining the Conductivities of the Two Charge Transport Phases in Solid-State Dye-Sensitized Solar Cells by Impedance Spectroscopy

Michael Graetzel, Shaik Mohammed Zakeeruddin, Soo-Jin Moon, Nripan Mathews, Feng Li

To apply impedance spectroscopy (IS) for studying charge transport in the mesoporous film of solid-state dye-sensitized solar cells (ss-DSCs), it is necessary to determine the relative conductivities of the electron and hole transporting phases, given the ...

American Chemical Society2013

Long-Range Balanced Electron- and Hole-Transport Lengths in Organic-Inorganic CH3NH3PbI3

Michael Graetzel, Nripan Mathews

Low-temperature solution-processed photovoltaics suffer from low efficiencies because of poor exciton or electron-hole diffusion lengths (typically about 10 nanometers). Recent reports of highly efficient CH3NH3PbI3-based solar cells in a broad range of co ...

American Association for the Advancement of Science2013

Decoupling light absorption and charge transport properties in near IR-sensitized Fe2O3 regenerative cells

Michael Graetzel, Satvasheel Powar, Nripan Mathews, Kazuteru Nonomura

We report a regenerative iron oxide nanorod solar cell sensitized with squarine (SQ02) dye, which improves the overall light harvesting due to the dye's complementary absorption. The use of illumination sources which enabled selective excitation of Fe2O3 a ...

Royal Society of Chemistry2013

Flexible, low-temperature, solution processed ZnO-based perovskite solid state solar cells

Michael Graetzel, Nripan Mathews

A ZnO compact layer formed by electrodeposition and ZnO nanorods grown by chemical bath deposition (CBD) allow the processing of low-temperature, solution based and flexible solid state perovskite CH3NH3PbI3 solar cells. Conversion efficiencies of 8.90% we ...

Royal Society of Chemistry2013

Photovoltage enhancement from cyanobiphenyl liquid crystals and 4-tert-butylpyridine in Co(II/III) mediated dye-sensitized solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Nripan Mathews, Kazuteru Nonomura

Two cyanobiphenyl liquid crystals (LCs), 5CB (4-cyano-4'-pentylbiphenyl) and 8CB (4-cyano-4'-octylbiphenyl), are introduced as additives into Co(II/ III) electrolytes for dye-sensitized solar cells (DSCs). An electrolyte containing a combination of these L ...

Royal Society of Chemistry2013

Light scattering enhancement from sub-micrometer cavities in the photoanode for dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Takeru Bessho, Nripan Mathews

A simple cell architecture that achieves enhanced light harvesting with less dye quantity while simultaneously improving the power conversion efficiency (PCE) of dye-sensitized solar cells is presented. Polystyrene (PS) spheres of sub-micrometer size were ...

Royal Society of Chemistry2012

Transparent, conducting Nb:SnO2 for host-guest photoelectrochemistry

Michael Graetzel, Maurin Cornuz, Takashi Hisatomi, Morgan Mertens Stefik, Nripan Mathews

Many candidate materials for photoelectrochemical water splitting will be better employed by decoupling optical absorption from carrier transport. A promising strategy is to use multiple thin absorber layers supported on transparent, conducting materials; ...

American Chemical Society (ACS)2012

Enhancement in the Performance of Ultrathin Hematite Photoanode for Water Splitting by an Oxide Underlayer

Michael Graetzel, Kevin Sivula, Takashi Hisatomi, Morgan Mertens Stefik, Nripan Mathews

Wiley-Blackwell2012

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