研究者詳細 - パンディ　シャム　スディル

論文 - パンディ　シャム　スディル

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Tandem Dye-Sensitized Solar Cells Based on TCO-less Back Contact Bottom Electrodes 査読有り

Ajay K. Baranwal, Naotaka Fujikawa, Terumi Nishimura, Yuhei Ogomi, Shyam S. Pandey, Tingli Ma and Shuzi Hayase

Journal of Physics:Conference Series 704 012003-1 - 012003-8 2016年04月

Orientation Characteristics of Non-regiocontrolled Poly (3-hexyl-thiophene) Film by FTM on Various Liquid Substrates 査読有り

M Pandey, S Nagamatsu, S S Pandey, S Hayase and W Takashima

Journal of Physics:Conference Series 704 012005-1 - 012005-7 2016年04月

Photophysical investigations of squaraine and cyanine dyes and their interaction with bovine serum albumin 査読有り

M Saikiran, D Sato, S S Pandey and T Kato

Journal of Physics:Conference Series 704 012012-1 - 012012-10 2016年04月

A Special Section on Recent Progress in Nano-Molecular Electronics 査読有り

Katsuhiko Ariga, Takaaki Manaka, Shyam S Pandey

Journal of Nanoscience and Nanotechnology 16 ( 4 ) 3157 - 3158 2016年04月

Design of far-red sensitizing squaraine dyes aiming towards the fine tuning of dye molecular structure 査読有り

Morimoto T., Fujikawa N., Ogomi Y., Pandey S., Ma T., Hayase S.

Journal of Nanoscience and Nanotechnology 16 ( 4 ) 3282 - 3288 2016年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2016 American Scientific Publishers. All rights reserved. Model squaraine dyes having sharp and narrow absorptions mainly in the far-red wavelength region has been logically designed, synthesized and used for their application as sensitizer in the dye-sensitized solar cells (DSSC). In order to have fine control on energetics, dyes having same mother core and alkyl chain length varying only in molecular symmetry and position of substituent were designed. It has been found that even keeping all other structural factor constant, only positional variation of substituent leads to not only in the variation of energetics by 0.1 eV but affects the photovoltaic characteristics also. Optimum concentration of dye de-aggregating agent was found to be 100 times with respect to the sensitizing dye concentration. Amongst dyes utilized in this work best performance was obtained for unsymmetrical dye SQ-40 giving a photoconversion efficiency of 4.01% under simulated solar irradiation at global AM 1.5.

DOI： 10.1166/jnn.2016.12304

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84969256666&origin=inward

Enhancing the performance of transparent conductive oxide-less back contact dye-sensitized solar cells by facile diffusion of cobalt species through TiO2 nanopores 査読有り

Md Zaman Molla, Minobu Kawano, Ajay K Baranwal, Shyam S Pandey, Yuhei Ogomi, Tingli Ma, Shuzi Hayase

RSC Advances 6 ( 40 ) 33353 - 33360 2016年03月

First principles analysis of oxygen vacancy formation and migration in Sr 2 BMoO 6 (B= Mg, Co, Ni) 査読有り

Shuai Zhao, Liguo Gao, Chunfeng Lan, SHYAM S PANDEY, Shuji Hayase and Tingli Ma

RSC Advances 6 ( 38 ) 31968 - 31975 2016年03月

First principles analysis of oxygen vacancy formation and migration in Sr<inf>2</inf>BMoO<inf>6</inf> (B = Mg, Co, Ni) 査読有り

Zhao S., Gao L., Lan C., Pandey S., Hayase S., Ma T.

RSC Advances 6 ( 38 ) 31968 - 31975 2016年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry 2016. Molybdenum-based double perovskites have been extensively studied as electrode materials in solid oxide fuel cells (SOFCs) due to their mixed ionic/electronic conductivity (MIEC) characteristics. Since the ionic conductivity in perovskite crystals arises primarily from oxygen ion diffusion via a vacancy-hopping mechanism, both the formation energy of the oxygen vacancy and the migration energy barrier play an essential role in the MIEC performance. In this work, we present a detailed first-principles investigation on the stoichiometric and oxygen-deficient structures of double perovskites, Sr 2 BMoO 6 (B = Mg, Co and Ni), using the density functional theory (DFT) method plus Hubbard U for Co and Ni. The electronic ground states of the oxygen-stoichiometric cells exhibited apparent eigenvalue gaps which are consistent with the measured insulating features. The oxygen-deficient structures were studied by removing a neutral oxygen atom according to SOFC working conditions, and the minimum energy path (MEP) of oxygen ion migration was optimized using the nudged elastic band (NEB) method which produced the theoretical migration energy barriers at the DFT+U level. The vacant oxygen sites released electrons to the adjacent cation d states, coupled with the delocalization characteristics of the Mo 4d state, which led eventually to the transition from an insulator to the electronic conductivity of the oxygen-deficient crystals. The electronic structure analysis suggested that the outer shell electrons of Mg, Co and Ni significantly affected the energies of oxygen vacancy formation and migration. Our results elucidate the effect of B-site substitution elements on the electronic properties and MIEC characteristics which provides theoretical support for the enhancement of the MIEC properties for these Mo-based double perovskites.

DOI： 10.1039/c6ra02297a

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84963740416&origin=inward

Oxygen vacancy formation and migration in double perovskite Sr<inf>2</inf>CrMoO<inf>6</inf>: A first-principles study 査読有り

Zhao S., Gao L., Lan C., Pandey S., Hayase S., Ma T.

RSC Advances 6 ( 49 ) 43034 - 43040 2016年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry 2016. The perovskite-type oxide ABO 3 with mixed ionic and electronic conductivity (MIEC) is a promising candidate for electrode materials of the intermediate-temperature solid oxide fuel cells (IT-SOFCs). The strontium molybdate SrMoO 3 shows high electrical conductivity but low oxygen ionic conductivity due to the stoichiometric features of oxygen. To enhance the oxygen ions diffusion rate, B-site Mo 4+ cation was partially substituted by trivalent transition metals (TM) to generate the oxygen-deficient double perovskite Sr 2 BMoO 6-δ . In this study, we present the theoretical investigation of the oxygen vacancy properties of Sr 2 CrMoO 6 (SCM) using density functional theory (DFT) with on-site Coulomb potential U for the Cr 3d electrons. The oxygen vacancy formation and migration were investigated for the B-site-ordered SCM, as well as the SCM with Cr/Mo antisite defects (ADs). The oxygen ion migration was optimized by the climbing image nudged elastic band (CINEB) method to identify the minimum energy pathway. The B-site Cr/Mo ADs allow various TM-O bond types in the double perovskite SCM. The calculated formation energy and migration barrier suggests that the B-site Cr/Mo ADs are favorable to enhance the oxygen ionic conductivity of the SCM. These results elucidate the influence of B-site Cr and Mo cations on the oxygen vacancy formation and migration in the double perovskite SCM, which can be useful for investigating Cr-doped SrMoO 3 as an IT-SOFCs anode.

DOI： 10.1039/c6ra05581h

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84968747312&origin=inward

Effect of Varying Alkyl Chain Length on Thermal Decomposition Temperature of Zinc (II) Xanthates and its Impact on Curing of Epoxy Resin 査読有り

Tarun Chand Vagvala*, Shyam Sudhir Pandey, Suvratha Krishnamurthy and Shuzi Hayase

Zeitschrift für anorganische und allgemeine Chemie 642 ( 2 ) 134 - 139 2015年11月

Effects of different chloride precursors on crystal growth of lead halide perovskites 査読有り

Vigneshwaran Murugan, Yuhei Ogomi, Shyam S Pandey, Taro Toyoda, Qing Shen, Shuzi Hayase

Applied Physics Express 8 ( 12 ) 125501-1 - 125501-4 2015年11月

Relationship between diffusion of Co 3+/Co 2+ redox species in nanopores of porous titania stained with dye molecules, dye molecular structures, and photovoltaic performances 査読有り

Minobu Kawano, Tsubasa Nishiyama, Yuhei Ogomi, Shyam S Pandey, Tingli Ma, Shuzi Hayase

RSC Advances 5 ( 102 ) 83725 - 83731 2015年10月

Combining novel device architecture and NIR dye towards the fabrication of transparent conductive oxide-less tandem dye sensitized solar cells 査読有り

Ajay Kumar Baranwal, Naotaka Fujikawa, Azwar Hayat, Yuhei Ogomi, Shyam S Pandey, Tingli Ma, Shuzi Hayase

Applied Physics Express 8 ( 10 ) 102301-1 - 102301-３ 2015年09月

Investigation of metal xanthates as latent curing catalysts for epoxy resin via formation of in-situ metal sulfides 査読有り

Tarun Chand Vagvala, Shyam Sudhir Pandey, Yuhei Ogomi, Tingly Ma, Shuzi Hayase

INORGANICA CHIMICA ACTA 435 292 - 298 2015年08月

First principles study on the electronic and optical properties of B-site ordered double perovskite Sr 2 MMoO 6 (M= Mg, Ca, and Zn) 査読有り

Shuai Zhao, Chunfeng Lan, Jie Ma, Shyam S Pandey, Shuzi Hayase, Tingli Ma

Solid State Communications 213-214 19 - 23 2015年04月

Simple Metal-Free Dyes from Triphenylamine for DSSC: A Comparative Study of Two Different Anchoring Groups

K. Narayanaswami, T. Swetha, Gaurav Kapil, Shyam S. Pandey, Shuzi Hayase and Surya Prakash Singh

Electrochimica Acta 169 256 - 263 2015年04月

Nonisothermal curing kinetics of epoxy resin composite utilizing Ga (III) xanthate as a latent catalyst 査読有り

Tarun Chand Vagvala*, Gaurav Kapil, Shyam S. Pandey, Yuhei Ogomi and Shuzi Hayase*

Journal of Applied Polymer Science 132 ( 26 ) 42149-1 - 42149-7 2015年03月

Dye-sensitized solar cells based on axially ligated phosphorus-phthalocyanine dyes 査読有り

Azwar Hayat, Gururaj M Shivashimpi, Terumi Nishimura, Naotaka Fujikawa, Yuhei Ogomi, Yoshihiro Yamaguchi, Shyam S Pandey, Tingli Ma, Shuzi Hayase

Applied Physics Express 8 ( 4 ) 047001-1 - 047001-4 2015年03月

Complete Photodynamics of the Efficient YD2-o-C8 Based Solar Cell 査読有り

Piotr Piatkowski, Cristina Martin, Maria Rosaria di Nunzio, Boiko Cohen, Shyam S Pandey, Shuzi Hayase, Abderrazzak Douhal

Piotr Piatkowski, Cristina Martin, Maria Rosaria di Nunzio, Boiko Cohen, Shyam S Pandey, Shuzi Hayase, Abderrazzak Douhal 118 29674 - 29687 2014年11月

A COMBINED THEORETICAL AND EXPERIMENTAL APPROACHES TOWARDS DESGNING NIR DYES FOR DYE-SENSITIZED SOLAR CELLS 査読有り

YOSHIHIRO YAMAGUCHI, SHYAM S. PANDEY, NAOTAKA FUJIKAWA, YUHEI OGOMI, SHUZI HAYASE

Journal of Engineering Science and Technology 9 53 - 66 2014年10月

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