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Aswani Yella

Cette personne n’est plus à l’EPFL

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Publications associées (36)

Peripherally and Axially Carboxylic Acid Substituted Subphthalocyanines for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Aswani Yella

A series of subphthalocyanines (SubPcs) bearing a carboxylic acid group either at the peripheral or axial position have been designed and synthesized to investigate the influence of the COOH group positions on the dye-sensitized solar cell (DSSC) performan ...

Wiley-Blackwell2014

Acetylene-bridged dyes with high open circuit potential for dye-sensitized solar cells

Pascal Comte, Michael Graetzel, Shaik Mohammed Zakeeruddin, Thomas Moehl, Aswani Yella, Yongjoo Kim, Fabrizio Giordano, Chi-Lun Mai

A series of simple metal-free organic dyes MS1-MS3 have been designed and synthesized, and their optical, electrochemical, and photovoltaic properties were investigated. The molecular structures are based on a push-pull framework with a triphenylamine, nap ...

RSC Publishing2014

Nanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency

Michael Graetzel, Mohammad Khaja Nazeeruddin, Leo-Philipp Heiniger, Aswani Yella, Peng Gao

We demonstrate low-temperature (70 degrees C) solution processing of TiO2/CH3NH3PbI3 based solar cells, resulting in impressive power conversion efficiency (PCE) of 13.7%. Along with the high efficiency, a strikingly high open circuit potential (V-OC) of 1 ...

American Chemical Society2014

Molecular Engineering of Push-Pull Porphyrin Dyes for Highly Efficient Dye-Sensitized Solar Cells: The Role of Benzene Spacers

Michael Graetzel, Shaik Mohammed Zakeeruddin, Aswani Yella, Chi-Lun Mai

Porphyrins have drawn much attention as sensitizers owing to the large absorption coefficients of their Soret and Q bands in the visible region. In a donor and acceptor zinc porphyrin we applied a new strategy of introducing 2,1,3-benzothiadiazole (BTD) as ...

Wiley-Blackwell2014

New sensitizers for dye-sensitized solar cells featuring a carbon-bridged phenylenevinylene

Michael Graetzel, Anne-Sophie Chauvin, Aswani Yella

We demonstrate that a carbon-bridged phenylenevinylene (CPV)-linked dye serves as a novel and efficient sensitizer for dye-sensitized solar cells. The cells show IPCE values of greater than 90%, PCEs of up to 7.12%, and high open circuit voltages reaching ...

Royal Society of Chemistry2013

Towards Compatibility between Ruthenium Sensitizers and Cobalt Electrolytes in Dye-Sensitized Solar Cells

Michael Graetzel, Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Joël Teuscher, Rosario Scopelliti, Ursula Röthlisberger, Ivano Tavernelli, Basile Curchod, Negar Ashari Astani, Aswani Yella, Julien Edouard Frey, Peng Gao, Simon Mathew, Lauren Elizabeth Polander

Wiley-Blackwell2013

The Molecular Engineering of Organic Sensitizers for Solar-Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aswani Yella, Thomas Wesley Holcombe

Wiley-Blackwell2013

Sterically demanded unsymmetrical zinc phthalocyanines for dye-sensitized solar cells

Mohammad Khaja Nazeeruddin, Aswani Yella, Peng Gao, Filippo de Angelis

Three new sterically demanding unsymmetrical zinc phthalocyanines have been designed and synthesized as sensitizers for dye-sensitized solar cells. All three unsymmetrical phthalocyanines have been completely characterized by elemental analyses, mass spect ...

Elsevier2013

Thiocyanate-Free Ru(II) Sensitizers with a 4,4-Dicarboxyvinyl-2,2-bipyridine Anchor for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aswani Yella, Kuan-Lin Wu, Shilong Wang

A new class of thiocyanate-free Ru(II) sensitizers with 4,4-dicarboxyvinyl-2,2-bipyridine anchor and two trans-oriented pyrid-2-yl pyrazolate (or triazolate) functional chromophores is synthesized, characterized, and evaluated in dye-sensitized solar cells ...

Wiley-Blackwell2013

Low temperature crystalline titanium dioxide by atomic layer deposition for dye-sensitized solar cells

Pascal Comte, Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Leo-Philipp Heiniger, Aswani Yella, Morgan Mertens Stefik

Low temperature processing of dye-sensitized solar cells (DSC) is crucial to enable commercialization with low-cost, plastic substrates. Prior studies have focused on mechanical compression of premade particles on plastic or glass substrates, however, this ...

Amer Chemical Soc2013

Molecular Engineering of a Fluorene Donor for Dye-Sensitized Solar Cells

Michael Graetzel, Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Joël Teuscher, Ursula Röthlisberger, Ivano Tavernelli, Basile Curchod, Negar Ashari Astani, Aswani Yella, Julien Edouard Frey, Simon Mathew, Lauren Elizabeth Polander

To improve their efficiency beyond the state-of-the-art, D-pi-A dyes must display increased spectral breadth and account for the physical limitations observed in the dye. sensitized solar cells. In particular, they should be designed to control the electro ...

Amer Chemical Soc2013

Unravelling the Potential for Dithienopyrrole Sensitizers in Dye-Sensitized Solar Cells

Two D−π−A dyes based on the dithieno[3,2-b:2′,3′-d]pyrrole π-bridge (DTP) were synthesized, characterized using UV−vis absorption spectroscopy and electrochemistry, modeled using quantum chemical calculations, and used as sensitizers in dye-sensitized sola ...

Amer Chemical Soc2013

Modulating dye E(S+/S*) with efficient heterocyclic nitrogen containing acceptors for DSCs

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aswani Yella

Acceptor motifs based on nitrogen containing heterocycles have been synthesized for use in dye-sensitized solar cells (DSCs). Through the selective addition of nitrogen atoms and increased conjugation of the nitrogen containing heterocycles the excited-sta ...

Royal Society of Chemistry2012

Improved redox couple for electrochemical and optoelectronic devices

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Aswani Yella, Hoi Nok Tsao

The present invention provides an improved redox couple for electrochemical and optoelectronic devices. The redox couple is based on a complex of a first row transition metal, said complex containing at least one mono-, bi-, or tridentate ligand comprising ...

2012

Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12 Percent Efficiency

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Aravind Kumar Chandiran, Aswani Yella, Chenyi Yi, Hoi Nok Tsao

The iodide/triiodide redox shuttle has limited the efficiencies accessible in dye-sensitized solar cells. Here, we report mesoscopic solar cells that incorporate a Co((II/III))tris(bipyridyl)-based redox electrolyte in conjunction with a custom synthesized ...

American Association for the Advancement of Science2011

Design and Development of Functionalized Cyclometalated Ruthenium Chromophores for Light-Harvesting Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Baumgartner, Aswani Yella

The syntheses and the electrochemical spectroscopic properties of a suite of asymmetrical bistridentate cyclometalated Ru(II) complexes bearing terminal triphenylamine (TPA) substituents are reported. These complexes, which contain structural design elemen ...

2011

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