Publications by Aravind Kumar Chandiran

Measurement of the inclusive and differential t(t)over-bar gamma cross sections in the dilepton channel and effective field theory interpretation in proton-proton collisions at root s=13 TeV

Jean-François Carlin, Rakesh Chawla, Richard Pitts, Arvind Shah, Ian Smith, Randoald Müller, Carlos Andres Peña Reyes, Jung Eung Park, Thomas Mountford, Matthias Finger, Jin Won Seo, Johannes Steen, Josef Andreas Schuler, Olivier Martin, Melody Swartz, Kyumin Lee, Hoang-Trang Lam, Maria Isabel Cordero Campana, Ananda Sankar Roy, Bertrand François, Yogesh Singh Chauhan, Xiaoqiang Wang, Miguel Fernández Ruiz, Sun Hee Kim, Jian Zhao, João Miguel das Neves Duarte, Justin Terence Notz Pekkanen, Joo Yeon Kim, Alexis Kalogeropoulos, Jae-Woo Choi, Pedro Camilo de Oliveira e Silva, Cristopher Ariel Zeballos Avila, Myun Sik Kim, Chao Wang, Yixing Chen, Aravind Kumar Chandiran, Tian Cheng, Ana Margarida Da Costa Ricardo, , , , , , , , , , , ,

Search for resonant and nonresonant new phenomena in high-mass dilepton final states at root s=13 TeV

Aravind Kumar Chandiran, Jan Steggemann, Konstantin Androsov

A search is presented for physics beyond the standard model (SM) using electron or muon pairs with high invariant mass. A data set of proton-proton collisions collected by the CMS experiment at the LHC at root s = 13 TeV from 2016 to 2018 corresponding to ...

Springer Nature2021

Coordinate parameterisation and spectral method optimisation for Beltrami field solver in stellarator geometry

David Pfefferlé, Aravind Kumar Chandiran, Antoine Baillod, Ajay Kumar

The numerical solution of the stepped pressure equilibrium (Hudson et al 2012 Phys. Plasmas 19 112502) requires a fast and robust solver to obtain the Beltrami field in three-dimensional geometry such as stellarators. The spectral method implemented in the ...

2020

Investigation on the Interface Modification of TiO2 Surfaces by Functional Co-Adsorbents for High-Efficiency Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Aravind Kumar Chandiran

The influence of interface modification of sensitized TiO2 surfaces by co-adsorbents on photovoltaic performance is detailed. We investigated different functional groups of co-adsorbents, such as carboxylic (4-guanidino butyric acid, chenodeoxycholic acid) ...

Wiley-Blackwell2017

Pyridyl- and Picolinic Acid Substituted Zinc(II) Phthalocyanines for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Aravind Kumar Chandiran

A series of tri-tert-butyl zinc(II) phthalocyanines (Pcs) substituted with pyridyl, carboxyl, or picolinic acid anchoring groups on the periphery were prepared. Photovoltaic (PV) studies on these dyes were carried out revealing some interesting features. I ...

Wiley-VCH Verlag2017

Double D-pi-A Dye Linked by 2,2'-Bipyridine Dicarboxylic Acid: Influence of para- and meta-Substituted Carboxyl Anchoring Group

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Peng Gao, Paramaguru Ganesan

Starting from 2,2-bipyridine dicarboxylic acid, two new (D--A)(2) sensitizers, including m-DA with the carboxyl anchoring group substituted meta to the donor-bridge moiety and p-DA with a para-substituted anchoring group, were synthesized in order to evalu ...

Wiley-Blackwell2015

Yttrium-substituted nanocrystalline TiO2 photoanodes for perovskite based heterojunction solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Aravind Kumar Chandiran, Thomas Moehl, Peng Gao, Peng Qin, Mohammad Ibrahim Dar

We report the use of Y3+-substituted TiO2 (0.5% Y-TiO2) in solid-state mesoscopic solar cells, consisting of CH3NH3PbI3 as the light harvester and spiro-OMeTAD as the hole transport material. A power conversion efficiency of 11.2% under simulated AM 1.5 fu ...

Royal Society of Chemistry2014

Quantum-Confined ZnO Nanoshell Photoanodes for Mesoscopic Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Aswani Yella, Chenyi Yi, Mojtaba Abdi Jalebi, Mohammad Ibrahim Dar

We present a photoanode for dye-sensitized solar cell (DSC) based on ZnO nanoshell deposited by atomic layer deposition at 150°C, on a mesoporous insulating template. An ultrathin layer of ZnO between 3 and 6 nm, which exhibits quantum confinement effect, ...

American Chemical Society2014

Sub-Nanometer Conformal TiO2 Blocking Layer for High Efficiency Solid-State Perovskite Absorber Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Aswani Yella, Peng Gao, Matthew Thomas Mayer

A mere 2 nm conformal titanium dioxide overlayer coated by atomic layer deposition is shown to act as a blocking layer for high-efficiency solid-state perovskite (CH3NH3PbI3) absorber-based solar cells. Surpassing the existing multilayer passivation, this ...

Wiley-Blackwell2014

Adapting Ruthenium Sensitizers to Cobalt Electrolyte Systems

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran

In this work, we report the use of bulky substitutions in a new heteroleptic ruthenium(II) bipyridine complex, Ru(NCS)(2)LL', coded TT-230 to obtain high open-circuit potential in a dye-sensitized solar cell (where L is a bipyridine ligand appended with tw ...

Amer Chemical Soc2014

Cyclopentadithiophene-functionalized Ru(II)-bipyridine sensitizers for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran

Two ruthenium sensitizers TT-230 and TT-232 based on cyclopenta[2,1-b:3,4-b']dithiophene (CDT) were tested in dye-sensitized solar cells (DSSCs) using,a tri-iodide/iodide redox couple, and their performances compared to the benchmark Z907. Both dyes of gen ...

Pergamon-Elsevier Science Ltd2014

Low temperature dye-sensitized solar cells based on conformal thin zinc oxide overlayer on mesoporous insulating template by atomic layer deposition

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Mojtaba Abdi Jalebi

Low temperature processing of Dye-sensitized Solar Cells (DSCs) is essential to enable commercialization with low cost plastic substrates and diminish the overall manufacturing cost. We report a low temperature processing route for photoanodes where thin Z ...

Elsevier Science Bv2014

Branched and bulky substituted ruthenium sensitizers for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran

We report on the synthesis, and photovoltaic performances of four novel Ru(II)-bipyridine heteroteptic complexes TT206-209, incorporating branched and bulkier alkyl chains compared to their linear analogues C106 and CYC-B11 previously reported. In both ser ...

Royal Society of Chemistry2014

Controlled synthesis of TiO2 nanoparticles and nanospheres using a microwave assisted approach for their application in dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Mohammad Ibrahim Dar

Rapid and facile synthesis of similar to 7 nm and similar to 100-400 nm nano-structures of anatase titania is achieved by exploiting the chemical nature of solvents through a microwave based approach. After using these nanostructures as a photoanode in dye ...

Royal Society of Chemistry2014

Sterically Hindered Phthalocyanines for Dye-Sensitized Solar Cells: Influence of the Distance between the Aromatic Core and the Anchoring Group

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Aravind Kumar Chandiran

A new phthalocyanine (Pc) bearing bulky peripheral substituents and a carboxylic anchoring group directly attached to the macrocycle has been prepared and used as a sensitizer in DSSCs, reaching 5.57% power conversion efficiency. In addition, an enhanced p ...

Wiley-Blackwell2014

Molecular Engineering of 2-Quinolinone Based Anchoring Groups for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Peng Gao, Paramaguru Ganesan

Six new donor-pi spacer-acceptor (D-pi-A) organic sensitizers based on the 2-quinolinone moiety as acceptor and anchoring groups were synthesized and tested for their performance in dye-sensitized solar cells (DSSCs). The systematic tuning of acceptor stre ...

American Chemical Society2014

Toward Higher Photovoltage: Effect of Blocking Layer on Cobalt Bipyridine Pyrazole Complexes as Redox Shuttle for Dye-Sensitized Solar Cells

Michael Graetzel, Jun Ho Yum, Paul Gratia, Aravind Kumar Chandiran, Thomas Moehl, Junghyun Yoon

Fluorine-doped tin-oxide (FTO) transparent conducting substrates, for use in cobalt bis(bipyridine pyrazole) complex based dye-sensitized solar cells (DSCs), were compared using the conventional TiCl4 treatment with conformal TiO2 blocking layers formed by ...

American Chemical Society2014

Analysis of Electron Transfer Properties of ZnO and TiO2 Photoanodes for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Mojtaba Abdi Jalebi

Mesoporous TiO2 nanoparticle films are used as photoanodes for high efficiency dye-sensitized solar cells (DSC). In spite of excellent photovoltaic power conversion efficiencies (PCE) displayed by titanium dioxide nanoparticle structures, the transport rat ...

American Chemical Society2014

The Role of Insulating Oxides in Blocking the Charge Carrier Recombination in Dye- Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran

Electron recombination is one of the major loss factors in dye-sensitized solar cells (DSC), especially, with single electron outer sphere redox shuttle electrolyte. Insulating sub-nanometer oxide tunneling layers deposited by atomic layer deposition (ALD) ...

Wiley-Blackwell2014

Passivation of ZnO Nanowire Guests and 3D Inverse Opal Host Photoanodes for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Aravind Kumar Chandiran, Thomas Moehl, Hauke Arne Harms, Philippe Pierre Labouchère

A hierarchical host-guest nanostructured photoanode is reported for dye-sensitized solar cells. It is composed of ZnO nanowires grown in situ into the macropores of a 3D ZnO inverse opal structure, which acts both as a seed layer and as a conductive backbo ...

Wiley-VCH Verlag Berlin2014