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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Parametric Optimization of Dye-Sensitized Solar Cells Using Far red Sensitizing Dye with Cobalt Electrolyte 査読有り

A Pradhan, M Saikiran, G Kapil, S S Pandey, S Hayase

Journal of Physics: Conference Series 924 012001(1) - 012001(9) 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

A far-red sensitizing dye SQ-75 has been employed as a model sensitizer with Co
(bpy) 2+/3+ redox electrolytes to fabricate dye-sensitized solar cells (DSSCs) and optimize
the various device parameters which influence the overall photoconversion efficiency (PCE).
It has been found that the optimization of the TiO 2 thickness, surface treatment with TiCl 4,
and an optimum amount of the chenodeoxycholic acid (CDCA) as coadsorber are necessary
to attain the overall improved PCE. TiCl 4 surface treatment on both FTO and TiO 2 has been
found to outperform as compared to their untreated counterparts owing to the suppression of
the charge recombination. DSSCs with an optimized TiO 2 thickness of 6 μm and CDCA
concentration of 4 mM have exhibited best performance due to enhanced photon harvesting
and reduced dye aggregation, respectively.

DOI： 10.1088/1742-6596/924/1/012001

Kyutacar

その他リンク： http://iopscience.iop.org/article/10.1088/1742-6596/924/1/012001/meta

Investigation of the minimum driving force for dye regeneration utilizing model squaraine dyes for dye-sensitized solar cells 査読有り

Anusha Pradhan, Takuya Morimoto, Maryala Saikiran, Gaurav Kapil, Shuzi Hayase, Shyam S Pandey

Journal of Materials Chemistry A 5 ( 43 ) 22672 - 22682 2017年10月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Combined theoretical and experimental approaches were implemented to design model far-red sensitive unsymmetrical squaraine dyes in order to estimate the minimum energy barrier required for dye regeneration. Our logical molecular design indicated that it is possible to have a fine control on the energetics within 0.2 eV only by the judicious selection of substituents and alkyl chain length keeping the main π-molecular framework the same. The utilization of the LSDA functional under TD-DFT calculations offered an effective and economical computational method for the reliable prediction of the energetics as well as the absorption maximum of the sensitizers. Among the designed dyes under investigation, SQ-75 exhibited the best photovoltaic performance, having a short-circuit current density of 10.92 mA cm−2, open circuit voltage of 0.57 V and a fill factor of 0.67, leading to a photoconversion efficiency of 4.25% despite having photon harvesting mainly in the far-red region. The best photon harvesting by SQ-75, even with an energy difference of only 0.12 eV between the energy of its highest occupied molecular orbital and redox energy level I−/I3− electrolyte, corroborates the possibility for dye regeneration with such a small driving force.

DOI： 10.1039/C7TA06990A

Kyutacar

Efficient near infrared fluorescence detection of elastase enzyme using peptide-bound unsymmetrical squaraine dye 査読有り

Maryala Saikiran, Daisuke Sato, Shyam S Pandey, Shuzi Hayase, Tamaki Kato

Bioorganic & Medicinal Chemistry Letters 27 ( 17 ) 4024 - 4029 2017年07月

Air-stable vapor phase sensing of ammonia in sub-threshold regime of poly(2,5-bis(3-tetradecylthiophen-2yl)thieno(3,2-b)thiophene) based polymer thin-film transistor 査読有り

Sahu P., Pandey M., Kumar C., Pandey S., Takashima W., Mishra V., Prakash R.

Sensors and Actuators, B: Chemical 246 243 - 251 2017年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V. In the present study, device geometry having top contact bottom gated poly(2,5-bis(3-tetradecylthiophen-2yl)thieno(3,2-b)thiophene) (PBTTT) based polymer thin film transistor (PTFT) is reported to measure the changes in electrical responses with the exposure to various concentrations of ammonia vapor at room temperature. PTFT is preferred over other electronic devices due to its multi-parameter characteristics to explore gas sensing capabilities. A facile floating–film transfer method (FTM) is used to prepare an active layer of PTFT by forming optimized thin layer of PBTTT film having a thickness of ∼25 nm. Exposure to various concentrations of ammonia vapor, device parameters like I/O characteristics, mobility, threshold voltage, and trap density are found to change significantly. As PTFT is exposed to 100 ppm ammonia vapor a 70% reduction in mobility is observed whereas threshold voltage shifted to more negative from −17.62 V to −23.64 V. Better sensing capabilities with a detection limit of 0.33 ppm, fast response and recovery of exposed ammonia vapor are observed, when PTFT is operated in sub-threshold regime rather than the cut-off or saturated regime. All the electrical characterizations for the sensing purpose are carried out in ambient but in a closed chamber. Device shows enormous potential for ammonia sensing for real and environmental applications.

DOI： 10.1016/j.snb.2017.02.063

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85013080947&origin=inward

Investigation of Interfacial Charge transfer in Solution Processed Cs2SnI6 Thin Films 査読有り

Gaurav Kapil, Takeshi Ohta, Tsuguo Koyanagi, Yaohong Zhang, Murugan Vigneshwaran, Yuhei Ogomi, Shyam Sudhir Pandey, Kenji Yoshino, Qing Shen, Taro Toyoda, Md Mijanur Rahman, Takashi Minemoto, Takurou N Murakami, Hiroshi Segawa, Shuzi Hayase

Journal of Physical Chemistry C 121 ( 24 ) 13092 - 13100 2017年06月

Interplay of Orientation and Blending: Synergistic Enhancement of Field Effect Mobility in Thiophene-Based Conjugated Polymers 査読有り

Manish Pandey, Shuichi Nagamatsu, Wataru Takashima, Shyam Sudhir Pandey, Shuzi Hayase

Journal of Physical Chemistry C 121 ( 21 ) 11184 - 11193 2017年05月

Layer-by-layer coating of oriented conjugated polymer films towards anisotropic electronics 査読有り

Pandey M., Sadakata S., Nagamatsu S., Nagamatsu S., Pandey S., Hayase S., Hayase S., Takashima W.

Synthetic Metals 227 29 - 36 2017年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Dynamic casting of floating-film and transferring method for preparing oriented multilayer films of conjugated polymers is reported. This method is based on dynamic casting of a floating-film on liquid substrate to obtain oriented thin-film followed by its transfer on a desired solid substrate. The uniqueness in this method lies in the isolation of casting and coating procedures of oriented films, which enables us to fabricate the oriented multilayer with minimum interlayer interference. It provides a key-technology to build up the organic multi-layered architecture while preserving oriented morphologies. Several types of multilayer films have been prepared and investigated in detail in terms of their film characteristics. The layer-by-layer coating of oriented films demonstrated by this method is found to be a unique feature which overcomes cumbersome procedures in the conventional orientation methods. The coating procedure demonstrated in this study provides a facile methodology to construct anisotropic architectures.

DOI： 10.1016/j.synthmet.2017.02.018

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85015758294&origin=inward

Solvent driven performance in thin floating-films of PBTTT for organic field effect transistor: Role of macroscopic orientation 査読有り

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

Organic Electronics: physics, materials, applications 43 240 - 246 2017年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V. Considering the advantages of floating film transfer method (FTM), we have investigated the optical and electronic characteristics of PBTTT-C14 thin-films prepared by the static and the dynamic casting on liquid substrate. It has been demonstrated that judicious selection of solvents during FTM switches the casting mode from the static casting (S-FTM) using high boiling point solvent to the dynamic casting (D-FTM) from low boiling point solvent. Although both of the methods provide the edge-on oriented structure of PBTTT-C14 by XRD, the structural and the optical analyses reveal relatively extended π-conjugation length in parallel D-FTM film as compared to that of S-FTM. A high field-effect mobility (μ) of 0.11 cm 2 /V.s was exhibited by OFETs fabricated by parallel D-FTM film even without any high temperature post-annealing up to the liquid crystalline phase transition. This observed value of μ for parallel D-FTM is 4.7 and 12.8 times higher than the isotropic S-FTM and the perpendicular D-FTM films, respectively.

DOI： 10.1016/j.orgel.2017.01.031

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85011373224&origin=inward

Controlling factors for orientation of conjugated polymer films in dynamic floating-film transfer method 査読有り

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

Journal of Nanoscience and Nanotechnology 17 ( 3 ) 1915 - 1922 2017年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2017 American Scientific Publishers All rights reserved. Orientation in conjugated polymers is a unique phenomenon by the virtue of their one dimensionality leading to semiconductor performances in organic electronic devices. A unique, cost-effective and highly efficient method for the fabrication of oriented thin film consisted of non-regiocontrolled poly(3-hexylthiophene) (NR-P3HT) using dynamic floating-film transfer method (dynamic-FTM) has been investigated. Orientation of NR-P3HT by dynamic-FTM has been quantitatively measured as the optical anisotropy represented by dichroic ratio (DR). Amongst several factors like concentration of polymer solution, temperature and viscosity of liquid-substrate along with post-annealing temperature, viscosity of liquid-substrate plays a crucial role in controlling the molecular orientation. A judicious control and optimization of various underlying factors affecting the molecular orientation led to relatively high DR of 9.3 even in NR-P3HT films cast by dynamic-FTM.

DOI： 10.1166/jnn.2017.12816

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85009971833&origin=inward

Transparent Conductive Oxide Layer and Hole Selective Layer Free Back-Contacted Hybrid Perovskite Solar Cell 査読有り

Zhaosheng Hu, Gaurav Kapil, Hiromitsu Shimazaki, Shyam Sudhir Pandey, Tingli Ma, Shuzi Hayase

The Journal of Physical Chemistry C 121 ( 8 ) 4214 - 4219 2017年02月

Combined theoretical and experimental approaches for development of squaraine dyes with small energy barrier for electron injection 査読有り

Shyam S Pandey, Takuya Morimoto, Naotaka Fujikawa, Shuzi Hayase

Solar Energy Materials and Solar Cells 159 625 - 632 2017年01月

Photophysical characterization and BSA interaction of the direct ring carboxy functionalized unsymmetrical NIR cyanine dyes 査読有り

Maryala Saikiran, Daisuke Sato, Shyam S Pandey, Takeshi Ohta, Shuzi Hayase, Tamaki Kato

Dyes and Pigments 140 6 - 13 2017年01月

Transparent conductive oxide-less back contact dye-sensitized solar cells using flat titanium sheet with microholes for photoanode fabrication 査読有り

Hayat A., Hayat A., Baranwal A., Nakamura M., Shigeki F., Pandey S., Ma T., Hayase S.

Journal of Photonics for Energy 7 ( 1 ) 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE). A flat titanium sheet with microholes (FTS-MH) has been utilized to fabricate transparent conductive oxide-less dye-sensitized solar cells (TCO-less DSSCs) in back contact device architecture. Utilization of FTS-MH to fabricate a TCO-less photoanode offers several advantages in terms of simplicity and ease of fabrication as compared with the TCO-less DSSCs structure reported previously. Hydrogen peroxide (H 2 O 2 ) surface treatments on FTS-MH have shown important factors to enhance the photoanode properties. H 2 O 2 surface treatment is able to change the surface morphology of FTS-MH, and the created anatase titanium dioxide (TiO 2 ) nanostructures increase the surface contact between the FTS-MH and the coated mesoporous TiO 2 . Electrochemical impedance investigations reveled that improvements of the FTS-MH/TiO 2 and TiO 2 /dye/electrolyte interface led to hampered charge recombination resulting in enhancement of both short-circuit current density and open-circuit voltage, respectively. Even after removal of both TCO layers, our complete TCO-less DSSCs exhibited a power conversion efficiency of 7.25% under simulated solar irradiation.

DOI： 10.1117/1.JPE.7.015501

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85009473630&origin=inward

Transparent conductive oxide-less dye-sensitized solar cells consisting of dye-cocktail and cobalt based redox electrolyte 査読有り

Molla M., Baranwal A., Pandey S., Ma T., Hayase S.

Journal of Nanoscience and Nanotechnology 17 ( 7 ) 4748 - 4754 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2017 American Scientific Publishers. All rights reserved. Thin Ti-metal protected stainless steel metal mesh coated with mesoporous TiO 2 as flexible photoanode has been used to fabricate back contact transparent conductive oxide-less dye-sensitized solar cells. TiO 2 nanoparticle having a particle size of 15-20 nm sensitized with dye cocktail of two indoline dyes D-205 and D-131 were first utilized owing to their complementary light harvesting properties. Short-circuit photocurrent density (J sc ) for the dye cocktail combination of D-205 and D-131 (1:1) was found to be increased due to the increased photon harvesting in the 400-500 nm mainly associated with the contribution from D-131 dye. In addition, the electron recombination was suppressed when dye cocktail was employed as confirmed by the dark current measurement leading to higher open-circuit voltage (V oc ). The enhanced J sc accompanied with increased V oc resulted in to an improved efficiency of 3.59% for this cocktail combination. To enhance the efficiency even further, we have utilized TiO 2 nanoparticle having a larger particle size of 30 nm facilitating the mass transport of the bulky [Co(bpy) 3 ] 3+/2+ redox species. In order to enhance the photon harvesting window TiO 2 nanoparticles were sensitized with porphyrin dye (YD2-o-C8) along with different dye cocktail combinations with another complementary dye (Y123). Utilization of a dye cocktail of YD2-o-C8 and Y123 (4:1) led to improved photoconversion efficiency of 5.25% under simulated solar irradiation.

DOI： 10.1166/jnn.2017.13746

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85018244458&origin=inward

Influence of backbone structure on orientation of conjugated polymers in the dynamic casting of thin floating-films 査読有り

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

Thin Solid Films 619 125 - 130 2016年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V. Dynamic casting of conjugated polymer films on liquid-substrate is a unique method which provides thin floating-film and can be easily transferred on a desired substrate by stamping. The important feature in this procedure is associated with the formation of thin polymeric film during compression and solidification controlled by viscous drag of liquid substrate and solvent evaporation of the polymer, respectively. Lyotropic liquid-crystalline (LC) characteristics of conjugated polymer possibly assist to orient the polymer chain in one direction. It is found that this method produce highly oriented thin films (dichroic ratio > 5) of thiophene-based conjugated polymers such as PBTTT-C14, PQT-C12 and non-regiocontrolled poly(3-hexylthiophene) NR-P3HT. On the other hand, weak orientation intensity in regioregular poly(3-hexylthiophene) RR-P3HT was found. The mechanism for this diverse orientation in thiophene-based conjugated polymers is discussed in correlation with the backbone chemical structure and lyotropic LC phase transition during the floating-film formation.

DOI： 10.1016/j.tsf.2016.11.015

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84997830850&origin=inward

Facile Synthesis and Characterization of Sulfur Doped Low Bandgap Bismuth Based Perovskites by Soluble Precursor Route 査読有り

Murugan Vigneshwaran, Takeshi Ohta, Satoshi Iikubo, Gaurav Kapil, Teresa S Ripolles, Yuhei Ogomi, Tingli Ma, Shyam S Pandey, Qing Shen, Taro Toyoda, Kenji Yoshino, Takashi Minemoto, Shuzi Hayase

Chemistry of Materials 28 ( 18 ) 6336 - 6340 2016年09月

Enhancement of carrier mobility along with anisotropic transport in non-regiocontrolled poly (3-hexylthiophene) films processed by floating film transfer method 査読有り

Manish Pandey, Shuichi Nagamatsu, Shyam S Pandey, Shuzi Hayase, Wataru Takashima

Organic Electronics 38 115 - 120 2016年08月

Indoor Light Performance of Coil Type Cylindrical Dye Sensitized Solar Cells 査読有り

Gaurav Kapil · Yuhei Ogomi · Shyam S. Pandey · Tingli Ma · Shuzi Hayase ·

Journal of Nanoscience and Nanotechnology 16 ( 4 ) 3183 - 3187 2016年04月

Effect of Addition of KI on the Hydrothermal Growth of ZnO Nanostructures Towards Hybrid Optoelectronic Device Applications 査読有り

Anubha bilgaiyan · Tejendra Dixit · Gaurav Kapil · Shyam S Pandey · Shuji Hayase Iyamperumal Anand Palani · Vipul Singh ·

Journal of Nanoscience and Nanotechnology 16 ( 4 ) 3301 - 3306 2016年04月

Parametric Optimization of Experimental Conditions for Dye-Sensitized Solar Cells based on Far-red Sensitive Squaraine Dye 査読有り

Takuya Morimoto, Naotaka Fujikawa, Yuhei Ogomi, Shyam S. Pandey, Shuzi Hayase

Journal of Physics:Conference Series 704 012002-1 - 012002-7 2016年04月

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