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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Relating the Photodynamics of Squaraine-Based Dye-Sensitized Solar Cells to the Molecular Structure of the Sensitizers and to the Presence of Additives 査読有り

G. de Miguel, M. Marchena, B. Cohen, S. S. Pandey, S. Hayase and A. Douhal

Journal of Physical Chemistry-C 116 ( 42 ) 22157 - 22168 2012年10月

Dye sensitized solar cells based on novel far red sensitizing unsymmetrical squaraine dye containing pyrroloquinoline moiety 査読有り

Pandey S., Fujikawa N., Watanabe R., Ogomi Y., Yamaguchi Y., Hayase S.

Japanese Journal of Applied Physics 51 ( 10 PART 2 ) 2012年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

A novel far-red sensitive and direct aromatic ring carboxy functionalized unsymmetrical squaraine dye based on pyrroloquinoline moiety has been synthesized for the application as sensitizer of dye sensitized solar cells. This dye bearing the characteristics of both of indole and quinoline moieties exhibits the photon harvesting up to 820 nm. The enhancement in the photon harvesting window by the pyrroloquinoline based squaraine dye was attributed to the presence of increased π-conjugation in its pyrroloquinoline donor part. This pyrroloquinoline bearing unsymmetrical squaraine dye exhibits a short circuit current density of 9.88 mA/cm2, an open circuit voltage of 0.57 V and fill factor of 0.59 leading to the external power conversion efficiency of 3.33% under simulated solar irradiation of 100mW/cm2 at AM 1.5 condition. © 2012 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.51.10NE12

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Back contact dye-sensitized solar cells of various shapes without transparent conducing oxides (TCO-less DCCSs)-

Jun Usagawa, Takeshi Kougo, Yuhei Ogomi, Shyam S. Pandey and Shuzi Hayase

Trends in Advanced Sensitized and Organic Solar Cells 2012年10月

Solution processable thin film organic photovoltaic cells based on far red sensitive2 soluble squaraine dye 査読有り

Shyam S. Pandey, Takafumi Mizuno, Sandeep K. Das, Yuhei Ogomi and Shuzi Hayase.

Thin Solid Films 522 401 - 406 2012年08月

Novel unsymmetrical squaraine dye bearing cyanoacrylic acid anchoring group and its photosensitization behaviour 査読有り

Gururaj M. Shivashimpi, Shyam S. Pandey, Rie Watanabe, Naotaka Fujikawa, Yuhei Ogomi, Yoshihiro Yamaguchi and Shuzi Hayase

Tetrahedron Letters 53 ( 40 ) 5437 - 5440 2012年07月

Femto- to millisecond photophysical characterization of indole-based squaraines adsorbed on TiO <inf>2</inf> nanoparticle thin films 査読有り

De Miguel G., Marchena M., Ziółek M., Pandey S., Hayase S., Douhal A.

Journal of Physical Chemistry C 116 ( 22 ) 12137 - 12148 2012年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

In this paper, we address femto- to millisecond transient absorption studies of TiO 2 nanoparticle (NP) thin films sensitized with four squaraine (SQ) molecules, with and without a deaggregating agent, chenodeoxycholic acid (CDCA). On the femto- to picosecond time scale, we determined the presence of three transient species by using singular value decomposition (SVD) analysis, i.e., S 1 of the SQ monomers, S 1 of the SQ H-aggregates, and the SQ radical cation formed after the electron injection. Both monomers and H-aggregates are proven to inject electrons to the TiO 2 conduction band, being 5 times faster in the monomers (e.g., k ei mon = 5.1 × 10 11 s -1 and k ei H-agg = 1.1 × 10 11 s -1 for SQ 41). Besides, the undesired singlet-singlet annihilation is an active process in these samples, constituting the drain of a high percentage of the absorbed photons. The coadsorption of CDCA on the TiO 2 NP avoids the formation of H-aggregates, and therefore, only two transient species are present in these samples: S 1 of the monomer and the SQ radical cation with k ei mon = 6.7 × 10 11 s -1 for SQ 41. On the microsecond scale, we only observed the transient feature of the radical cation of the SQ that permits one to study its recombination dynamics. Similar lifetimes (94-150 μs) of the four SQ radial cations are obtained when only monomers are present in the sample. In the absence of CDCA, the presence of H-aggregates contributes to shorten the lifetime of the radical cation (e.g., from 110 to 45 μs in the case of SQ 41). This fact can be explained by considering a stronger electronic coupling of H-aggregates/TiO 2 surface with respect to the monomers. These results explore the photodynamics of this family of SQs adsorbed on TiO 2 NP in a very large time window and will enable a better understanding of the influence of aggregates in the kinetics of these SQs used as sensitizers in DSSCs. © 2012 American Chemical Society.

DOI： 10.1021/jp302928f

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Femto to Millisecond Photophysical Characterization of Indole-based Squaraines Adsorbed on TiO2 Nanoparticle Thin Films. 査読有り

de Miguel, Gustavo; Marchena, Maria Jose; Ziolek, Marcin; Pandey, Shyam; Hayase, Shuzi; Douhal, Abderrazzak

Journal of Physical Chemistry-C; 116 ( 22 ) 12137 - 12148 2012年05月

Flexible Transparent Conductive Oxide-less Flat and Cylinder Dye-Sensitized Solar Cells 査読有り

Jun Usagawa, Takeshi Kougo, Kengo Sadamasu, Shyam S. Pandey, Yuhei Ogomi and Shuzi Hayase

Journal of Photonics for Energy 2 ( 1 ) 021011-1 - 021011-10 2012年05月

Photophysics of H-and J-aggregates of Indole based squaraines in solid state. 査読有り

G. de Miguel, M. Ziolek, M, Zitnan, J. A. Organero, S. S. Pandey, S Hayase and A. Douhal

Journal of Physical Chemistry-C 116 ( 17 ) 9379 - 9389 2012年04月

Multiple electron injection dynamics in linearly linked two dye-co-sensitized nanocrystalline metal oxide electrode for dye sensitized solar cells;; 査読有り

Qing Shen, Y. Ogomi, Byung-wook Park, Takafumi Inoue, Shyam S. Pandey, Akari Miyamoto, Shinsuke Fujita, Kenji Katayama, Taro Toyoda and Shuzi Hayase

Physical Chemistry and Chemical Physics 14 4605 - 4613 2012年01月

Transparent conductive oxide less flexible dye-sensitized solar cells with flat and cylinder shapes 査読有り

Usagawa J., Park B., Ogomi Y., Pandey S., Hayase S.

Materials Research Society Symposium Proceedings 1435 ( January ) 51 - 54 2012年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2012 Materials Research Society. Transparent conductive oxide less flexible dye-sensitized solar cells (TCO-less DSC) with flat and cylinder shapes are reported. The cell consists of a plastic cover, a flexible titania/dye sheet back contacted with a metal mesh sheet, a gel electrolyte sheet, and Pt layer on a Ti sheet. How to increase the efficiency were discussed. We concluded that making a titania/dye layer on a metal mesh sheet thinner and using a thinner electrolyte layer were effective for increasing the efficiency. A flat TCO-less DSC with 6.1 % efficiency and a cylindrical TCO-less DSC with 5.1 % efficiency are reported.

DOI： 10.1557/opl.2012.1695

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Femto to millisecond observations of indole-based squaraines molecules photodynamics in Solution 査読有り

G. de Miguel, M. Marchena, M. Ziolek, M, Zitnan, S. S. Pandey, S Hayase and A. Douhal

Physical Chemistry and Chemical Physics 2011年12月

Multiple electron injection from dyes to titania layer for high efficiency-dye-sensitized solar cells 査読有り

Park B., Sadamasu K., Ogomi Y., Miyamoto A., Fujita S., Pandey S., Shen Q., Shen Q., Toyoda T., Hayase S.

Conference Record of the IEEE Photovoltaic Specialists Conference 001187 - 001191 2011年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We report two kinds of dye-sensitized solar cells where multiple electron injection mechanism is used. One is multiple electron injection consisting of linearly linked two dye molecules. Tin(IV) 2,11,20,29-tetra-tert-butyl-2,3- naphthalocyanine (NcSn) was adsorbed on a SnO 2 surface by a Sn(p)-O-Sn(n) linkage, where Sn(p) and Sn(n) stand for a Sn atom on a Sn nanoparticle surface and that at the center of NcSn, respectively. Cis-diisothiocyanato- bis(2,2′-bipyridyl-4,4′-dicarboxylato) ruthenium(II) bis(tetrabutylammonium), known as N719, was bonded to NcSn by a-Sn(n)-O-CO-linkage. The incident photon to photocurrent efficiency (IPCE) curve of the cell (DD-cell) suggested that electrons are injected from both N719 and NcSn to SnO 2 nanoparticles. The mechanism was supported by transient absorption spectra studies. The other is multiple electron injection from double titania layer (top and bottom layers). The top and bottom electrodes were stained with different dyes having different λ max. A top layer fabricated on a glass was mechanically pressed with a bottom layer fabricated on a glass cloth to fabricate an anode. The glass cloth acts as a supporter of a porous titania layer as well as a holder of electrolyte. The incident photon to current efficiency (IPCE) curve had two peaks corresponding to those of the two dyes, which demonstrates that electrons are collected from both the top and bottom layers. © 2011 IEEE.

DOI： 10.1109/PVSC.2011.6186168

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Transparent Conductive Oxide-less thee-dimentional cylindrical dye-sensitized solar cell fabricated with flexible metal mesh electrode 査読有り

Jun Usagawa, Shyam S. Pandey, Yuhei Ogomi, Sho Noguchi, Yoshihiro Yamaguchi and Shuzi Hayase

Progress in Photovoltaics Research and Applications 2011年11月

Aiming at high efficiency dye-sensitized solar cells - From the view point of photoconversion interface 査読有り

Hayase S., Ogomi Y., Pandey S.

Electrochemistry 79 ( 10 ) 761 - 764 2011年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Researches aiming at high efficiency-dye-sensitized solar cells (DSC) are reviewed from the view point of photoconversion interfaces. Developments of dyes converting photons to electrons in near infrared regions are essential for increasing short circuit current (Jsc). Hybrid cells consisting of double dye structures and double titania layer structures are proposed. Leak currents at photoconversion interfaces decrease open circuit voltage (Voc) and fill factor (FF). Therefore, strategies for decreasing leak currents are essential, especially for all-solid DSCs and IVLf free DSCs. Structures of these interfaces are discussed in terms of surface passivation, self-organization, dye structures, interactions between dyes and I3 - in titania nanopores. Fundamental studies for tandem cells are also reported.

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Fine tuning the structure of unsymmetrical squaraine dyes towards the development of efficient dye sensitized solar cells 査読有り

Shyam S. Pandey, Rie Watanabe, Naotaka Fujikawa, Yuhei Ogomi, Yoshihiro Yamaguchi and Shuzi Hayase

SPIE Proceeding 8111 811116-1 - 811116-9 2011年09月

Investigating the Role of Dye Dipole on Open Circuit Voltage in Solid-State Dye-Sensitized Solar Cells 査読有り

Shyam S Pandey, Kyung-Young Lee, Azwar Hayat, Yuhei Ogomi, and Shuzi Hayase

Japanese Journal of Applied Physics 50 ( 6 ) 06GF08-1 - 06GF08-4 2011年06月

Transparent conductive oxideless tandem dye-sensitized solar cells consisting of light-splitting structures 査読有り

Jun Usagawa,Masaki Kaya,Yuhei Ogomi,Shyam S. Pandey,and Shuzi Hayase

Journal of Photonics for Energy 1 ( 1 ) 011110 - 1 2011年03月

Hybrid Dye-Sensitized Solar Cells Consisting of Double Titania Layers for Harvesting Light with Wide Range of Wavelengths 査読有り

Kengo Sadamasu,Takafumi Inoue,Yuhei Ogomi,Shyam S. Pandey,and Shuzi Hayase

Applied Physics Express 4 ( 2 ) 022301 - 1 2011年01月

TCO-less 3D-DYE-sensitized solar cells consisting of charge separation sheet and direction to high efficiency cells by using TCO-less structure 査読有り

Usagawa J., Uzaki K., Pandey S., Ogomi Y., Yamaguchi Y., Kono M., Hayase S.

Conference Record of the IEEE Photovoltaic Specialists Conference 518 - 522 2010年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Three dimensional transparent conductive oxide-less dye-sensitized solar cells (3D-TCO-less DSCs) consisting of a flexible porous titania sheet are reported. The flexible titania sheet is composed of a dye stained porous titania layer and a mesh sheet acting as the backbone. Flexible TCO-less DSCs, tandem DSCs, TCO-less cylinder DSCs and TCO-Iess cubic DSCs are fabricated and their fundamental photovoltaic performances are reported. © 2010 IEEE.

DOI： 10.1109/PVSC.2010.5616802

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