Faculty Profiles - PANDEY Shyam sudhir

Papers - PANDEY Shyam sudhir

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2D positional profiling of orientation and thickness uniformity in the semiconducting polymers thin films Reviewed

Nikita Kumari, Atul SM Tripathi, Shifumi Sadakata, Manish Pandey, Shuichi Nagamatsu, Shuzi Hayase, Shyam S Pandey

Organic Electronics ( Elsevier ) 68 221 - 229 2019.02

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Harnessing the full potential of solution processable conjugated polymers (CPs) as active semiconductor elements lies in the facile thin film fabrication along with amicable control of molecular self-assembly and orientation. Probing the nature and uniformity of thin films are inevitable for fabrication of devices with high reproducibility. Herein, a new method for the fast and facile profiling of thickness and molecular orientation of large area thin films is being reported. Thin films of PBTTT-C14 fabricated by three different methods like floating film transfer method (FTM), friction transfer and spin coating were subjected to profiling of thickness and molecular orientation using 2D positional mapping system followed by fabrication of organic thin film transistors. In order to prove applicability of the mapping system on other CPs, oriented films of PQT-C12 were also prepared by FTM and optical anisotropy estimated by the mapping system (23.0) and conventional spectrophotometer (22.4) validates the performance of our positional mapping system. Spin-coated thin films of PBTTT-C14 subjected to positional profiling of the film uniformity revealed that films are non-uniform and there was a gradual increase in the thickness from center to the periphery.

DOI： 10.1016/j.orgel.2019.02.011

Kyutacar

Other Link： https://www.sciencedirect.com/science/article/pii/S1566119919300746

Back-illuminated dye-sensitized solar cell flexible photoanode on titanium foil Reviewed

Shaban S., Shafie S., Pandey S.S., Lokman M.Q., Ahmad F., Hamidon M.N., Sharif N.F.M.

ASM Science Journal 12 ( SpecialIssue4 ) 29 - 35 2019.01

Language：English Publishing type：Research paper (scientific journal)

© 2019, Akademi Sains Malaysia. This paper reports the preparation and performance analysis on dye-sensitized solar cells (DSSC) using titanium (Ti) foil as flexible photoanode for back-illuminated measurement. Performance differences were also carried with the fluorine-doped tin oxide (FTO) glass photoanode using the back and front-illuminated technique. The hydrogen peroxide (H2O2) treated Ti foil surface was applied and the doctor blade method was used for deposition on photoanode during the process of fabrication. Surface morphology of the treated Ti Foil with H2O2 shows the formation of TiO2 nanostructure which results in significant attachment of TiO2 layer on Ti Foil. The results on measurement show that the fabricated flexible photoanode DSSC has an efficiency of power conversion at 1.00% under 1.5 A. M solar radiation by using back-illuminated while DSSC with solid-state glass photoanode has an efficiency power conversion at 0.53% (back-illuminated) and 2.22% (front-illuminated). However, the flexible photoanode DSSC has better power conversion efficiency than the solid-state glass photoanode DSSC under the condition of back-illumination. It is lower in result comparatively with front illumination DSSC due to the coated of platinum at the counter electrode that reflects light partially, while electrolyte iodine absorbs some photons and effects on DSSC performance.

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85084484893&origin=inward

Synthesis, characterizations and photo-physical properties of novel lanthanum (III) complexes Reviewed

Iffat Ameen, Abhishek Kumar Tripathi, Afshan Siddiqui, Gaurav Kapil, Shyam S Pandey, Umesh Nath Tripathi

Journal of Taibah University for Science 12 ( 6 ) 796 - 808 2018.11

Facile fabrication of large area oriented conjugated polymer films by ribbon-shaped FTM and its implication on anisotropic charge transport Reviewed

Atul S.M.Tripathi, Nikita Kumari, Shuichi Nagamatsu, Shuzi Hayase, Shyam S.Pandey

Organic Electronics ( Elsevier ) 65 1 - 7 2018.10

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Facile fabrication of large area [20 cm (L) × 2 cm (W)] uniform and oriented thin films of a variety of conjugated polymers (CPs) with minimal material wastage has been successfully demonstrated using our newly developed ribbon-shaped floating film transfer method (FTM). Under identical film fabrication conditions of FTM like hydrophilic liquid substrate consisted of ethylene glycol and glycerol (3:1), the temperature of 60 °C and polymer concentration 1% (w/w) in chloroform, order of molecular orientation was found to be PQT-C12 > F8T2 > NR-P3HT > PBTTT-C14 > PTB7. Depending on the nature of polymeric backbone, CPs exhibited different optical anisotropies in their oriented thin films, which was explained in terms of nature and rigidity of polymeric chains in the light of persistent length. Organic field effect transistors fabricated using these CPs exhibited clear p-type behaviour and anisotropic charge transport. Amongst various CPs used, PQT-C12 not only exhibited the highest optical anisotropy (DR = 5.1) but also highest anisotropic charge transport (μ||/μ⊥ = 7.1). Ribbon-shaped thin films of PQT-C12 prepared by slider based FTM exhibited best device performance with charge carrier mobility of 5.0 × 10−2 cm2/V and ON/OFF ratio of 106, when films were oriented parallel to the channel direction. Interestingly, a mobility of parallel oriented thin films prepared by FTM was about two orders of magnitude higher compared to the OFETs fabricated using conventional spin coating (6.7× 10−4 cm2/V).

DOI： 10.1016/j.orgel.2018.10.043

Kyutacar

Other Link： https://www.sciencedirect.com/science/article/pii/S1566119918305585

Synthesis and Optoelectrical Characterization of Novel Squaraine Dyes Derived from Benzothiophene and Benzofuran Reviewed

G. Hanumantha Rao, Manish Pandey, Kamatham Narayanaswamy, Ravulakollu Srinivasa Rao, Shyam S. Pandey, Shuzi Hayase, and Surya Prakash Singh

ACS Omega 3 ( 10 ) 13919 - 13927 2018.10

Enhancement of charge transport in quantum dots solar cells by N-butylamine-assisted sulfur-crosslinking of PbS quantum dots Reviewed

Zhen Wang, Zhaosheng Hu, Muhammad Akmal Kamarudin, Gaurav Kapil, Atul Tripathi, Qing Shen, Kenji Yoshino, Takashi Minemoto, Sham S. Pandey, Shuzi Hayase

Solar Energy 174 399 - 408 2018.09

Synthesis and Photophysical Characterization of Unsymmetrical Squaraine Dyes for Dye-Sensitized Solar Cells utilizing Cobalt Electrolytes Reviewed

Anusha Pradhan, Maryala Saikiran, Gaurav Kapil, Shuzi Hayase, and Shyam Sudhir Pandey

ACS Applied Energy Materials 1 ( 9 ) 4545 - 4553 2018.08

A review of transparent solar photovoltaic technologies Reviewed

Alaa AF Husain, Wan Zuha W Hasan, Suhaidi Shafie, Mohd N Hamidon, Shyam Sudhir Pandey

Renewable and Sustainable Energy Reviews 94 779 - 791 2018.07

Study Pertaining to Observe the Effect of PbI2 Passivation on Carbon Electrode for Perovskite Solar Cells by Quartz Crystal Microbalance System Reviewed

Putao Zhang, Gaurav Kapil, Kengo Hamada, Shyam Sudhir Pandey, Tingli Ma, Shuzi Hayase

ACS Sustainable Chemistry & Engineering 6 ( 8 ) 10221 - 10228 2018.06

Anisotropic charge transport in highly oriented films of semiconducting polymer prepared by ribbon-shaped floating film Reviewed

Atul SM Tripathi, Manish Pandey, Shifumi Sadakata, Shuichi Nagamatsu, Wataru Takashima, Shuzi Hayase, Shyam S Pandey

112 ( 12 ) 123301-1 - 123301-5 2018.03

Implications of doping and depletion on the switching characteristics in polymer-based organic field-effect transistors Reviewed

Shashi Tiwari, Manish Pandey, Wataru Takashima, Shuichi Nagamatsu, SK Balasubramanian, Shuzi Hayase, Shyam S Pandey, Rajiv Prakash

Organic Electronics 56 152 - 158 2018.02

Rapid Formation and Macroscopic Self-Assembly of Liquid-Crystalline, High-Mobility, Semiconducting Thienothiophene Reviewed

Manish Pandey, Ashwathanarayana Gowda, Shuichi Nagamatsu, Sandeep Kumar, Wataru Takashima, Shuzi Hayase, Shyam S. Pandey

Advanced Materials Interfaces 5 ( 6 ) 1700875(1) - 1700875(11) 2018.01

Casting Control of Floating-films into Ribbon-shape Structure by modified Dynamic FTM Reviewed

Tripathi, M Pandey, S Nagamatsu, SS Pandey, S Hayase, W Takashima

Journal of Physics: Conference Series 924 ( 1 ) 012014(1) - 012014(6) 2017.11

Photophysical Characterization and BSA Interaction of Direct Ring Carboxy Functionalized Symmetrical squaraine Dyes Reviewed

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

Journal of Physics: Conference Series 924 ( 1 ) 012006(1) - 012006(10) 2017.11

Parametric Optimization of Dye-Sensitized Solar Cells Using Far red Sensitizing Dye with Cobalt Electrolyte Reviewed

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

Journal of Physics: Conference Series 924 012001(1) - 012001(9) 2017.11

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

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

Journal of Materials Chemistry A 5 ( 43 ) 22672 - 22682 2017.10

Efficient near infrared fluorescence detection of elastase enzyme using peptide-bound unsymmetrical squaraine dye Reviewed

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

Bioorganic & Medicinal Chemistry Letters 27 ( 17 ) 4024 - 4029 2017.07

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 Reviewed

246 243 - 251 2017.07

Investigation of Interfacial Charge transfer in Solution Processed Cs2SnI6 Thin Films Reviewed

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 2017.06

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

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

Journal of Physical Chemistry C 121 ( 21 ) 11184 - 11193 2017.05

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Papers - PANDEY Shyam sudhir