PANDEY Shyam sudhir



Associate Professor


2-4 Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka

Research Fields, Keywords

Dye-Sensitized, Solar Cells, Organic Electronics, Photo-Functional Materials


E-mail address





Post Graduate Education 【 display / non-display

  • 1987.03  Gorakhpur University, Gorakhpur  Graduate School, Division of Chemistry  Biophysical Chemistry  Master's Course  Completed  INDIA

Degree 【 display / non-display

  • NPL New Delhi/Gorakhpur University -  Ph.D.  1997.04

Biography in Kyutech 【 display / non-display

  • 2014.04

    Kyushu Institute of TechnologyGraduate School of Life Science and Systems Engineering   Department of Biological Functions Engineering   Associate Professor  

  • 2012.04

    Kyushu Institute of TechnologyGraduate School of Life Science and Systems Engineering   Department of Biological Functions and Engineering   Associate Professor  

  • 2009.04

    Kyushu Institute of TechnologyGraduate School of Life Science and Systems Engineering   Assistant Professor  

Biography before Kyutech 【 display / non-display

  • 2008.04

    Fukuoka Industry Science and Technology Foundation   Knowledge Cluster Iniative Researcher   JAPAN

  • 2003.10

    Kitakyushu Foundation for Advancement of Industry, Science and Technology   Invited Researcher   JAPAN

  • 2001.09

    Japan Society for the Promotion of Science   JSPS Fellow   JAPAN

  • 1998.04

    Fukuoka Industry Science and Technology Foundation   Specialized Researecher   JAPAN

Academic Society Memberships 【 display / non-display

  • 2016.12

    International Conference on Computational Methods in Engineering and Health Sciences  JAPAN

  • 2016.07

    9th International Conference on Materials for Advanced Technology (ICMAT-2017)  SINGAPORE

Specialized Field (scientific research fund) 【 display / non-display

  • Thin film/Surface and interfacial physical properties

  • Device related chemistry

  • Functional solid state chemistry

  • Thin film/Surface and interfacial physical properties

  • Device related chemistry

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Publications (Article) 【 display / non-display

  • Synthesis, Photophysical characterization and dye adsorption behavior in unsymmetrical squaraine dyes with varying anchoring groups

    Ajendra Kumar Vats, Anusha Pradhan, Shuzi, Hayase, Shyam S. Pandey

    Journal of Photochemistry and Photobiology A: Chemistry  ( Elsevier )  394   112467(1) - 112467(12)   2020.03  [Refereed]

     View Summary

    Four newly designed unsymmetrical squaraine dyes bearing different functional groups for their anchoring on the surface of mesoporous TiO2 were successfully synthesized aiming towards development of far-red sensitizers for dye-sensitized solar cells (DSSCs). The synthesized dyes were characterized by 1H NMR, fast ion bombardment mass, and subjected to photophysical investigations by electronic absorption/fluorescence emission spectroscopy and cyclic voltammetry. These dyes exhibited excellent solubility in a number of common organic solvents. Adsorption behavior of these dyes on the thin films of mesoporous TiO2 was investigated in detail and results indicated that rate of dye adsorption follows the order −COOH>-PO3H2>OH > SO3H. At the same time, dye desorption studies demonstrated that stability of adsorbed dyes on the mesoporous TiO2 follows the order -PO3H2>>OH>−COOH > –SO3H. Further, implication of the nature of anchoring groups of dye molecules upon the energy levels of their highest occupied molecular orbital and lowest unoccupied molecular orbital was evaluated by both of the combined theoretical and experimental approaches. In spite of enhanced dye loading, very high binding strength and favorable energetic cascade, SQ-143 bearing Phosphonic acid exhibited hampered photovoltaic performance as compared to that of SQ-138 with carboxylic acid anchoring group. Amongst various sensitizers used for present investigation, SQ-138 exhibited best photovoltaic performance having short-circuit current density, open circuit voltage and fill factor of 12.49 mA/cm2, 0.60 V, and 0.53, respectively, leading to power conversion efficiency of 4.07 % after simulated solar irradiation.


  • Molecular Orientation and Anisotropic Charge Transport in the Large Area Thin Films of Regioregular Poly (3-alkylthiopnes) Fabricated by Ribbon-Shaped FTM

    Atul SM Tripathi, Rakesh Kumar Gupta, Shubham Sharma, Shuichi Nagamatsu, Shyam S Pandey

    Organic Electronics  ( Elsevier )  81   105683(1) - 105683(9)   2020.03  [Refereed]

     View Summary

    Introduction of alkyl chains is a plausible approach to impart the facile solution processability in regioregular (poly-3-alkylthiophenes) (RR-P3ATS) but drastic fall in the conductivity as a function of increasing alkyl chain length restricted the versatile use of its hexyl substituted derivative (P3HT). In this work, fabrication of large area oriented thin films of RR-P3ATs with varying alkyl chain lengths was successfully demonstrated using ribbon shaped floating film transfer method (FTM). Observed decrease in the molecular orientation with increasing alkyl chain length was explained by enhanced alkyl chain inter-digitation as evidenced by trends of d-spacing estimated from the out-of-plane XRD results. In-plane GIXD revealed edge-on orientation in the thin films of all of the P3ATs prepared by ribbon-shaped FTM, which is highly desired for planer charge carrier transport. Parallel oriented thin film of longest alkyl chain (octadecyl) substituted P3AT poly (3-octadecylthiophene) exhibited a field effect transistor (FET) mobility of 1.9 × 10−2 cm2/V, which is about 4–5 orders of magnitude higher as compared its previously reported values estimated by time-of-flight and FET methods. Thus, fabrication of thin films by FTM leads to versatile choice of RR-P3ATs for solution processing for FETs using common organic solvents without having any detrimental impact of alkyl chain length on the charge carrier mobility.


  • Investigation and control of charge transport anisotropy in highly oriented friction transferred polythiophene thin films

    Nikita Kumari, Manish Pandey, Shuichi Nagamatsu, Masakazu Nakamura, Shyam Sudhir Pandey

    ACS Applied Materials & Interfaces  ( American Chemical Society )  12 ( 10 ) 11876 - 11883   2020.02  [Refereed]

     View Summary

    Highly oriented thin films of poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT) were prepared by friction-transfer technique followed by their characterization using polarized absorption spectroscopy, angle-dependent polarized Raman spectroscopy, and X-ray diffraction (XRD) techniques. Orientation in high-molecular-weight (MW) polymers is hampered by chain folding or entanglements, which limit their macromolecular orientation. Interestingly, utilizing high-molecular-weight PBTTT (MW > 50 kDa) and friction-transfer technique, successful fabrication of highly oriented thin films with very high dichroic ratio (∼30) was demonstrated. The role of the substrate’s surface energy and its impact on the field-effect mobility (μ) of the oriented thin films were comprehensively investigated. The influence of annealing the thin films as prepared on the bare and self-assembled monolayer (SAM)-treated SiO2 surfaces exhibiting differential trends of μ was systematically investigated. This was explained by partial and complete conformational transformation of macromolecules on bare and SAM-treated SiO2 surfaces, respectively, after annealing them beyond liquid crystalline phase transition temperature, as revealed by in-plane and out-of-plane XRD results. On bare SiO2, optimum μ up to 0.03 cm2 V–1 s–1 along the backbone orientation was obtained for the thin films annealed to 120 °C; whereas, it reached up to 0.36 cm2 V–1 s–1 on SAM-treated SiO2 after annealing at 200 °C. Finally, a charge transport mechanism was proposed taking evidence from the anisotropic optical and electrical characteristics of the friction-transferred PBTTT films into consideration.


  • 2D positional mapping of casting condition driven microstructural distribution in organic thin films

    Nikita Kumari, Manish Pandey, Shuichi Nagamatsu, Shyam S Pandey

    Japanese Journal of Applied Physics  ( IOP Science )  69 ( SC ) SCCA06-1 - SCCA06-6   2019.11  [Refereed]

     View Summary

    Fabrication of large-area thin films and their swift characterization is highly desired for the commercial aspects of the organic electronic devices. Although a number of techniques have been proposed for the large-area thin film fabrication, the microstructural variation is still an issue. In this work, the facile characterization of distribution in thickness and macromolecular ordering in the drop-casted and spin-coated poly(3-hexylthiophene) thin films have been performed through newly developed 2D positional mapping technique. Through this technique, a comparative analysis of the absorption spectra in terms of peak absorbance and excitonic bandwidth (W) was performed for the whole sample, the lower value of W observed for the drop-casted thin film depicts its molecular ordering. Moreover, the difference in W (≈ 10 meV) was noticed between two points (≈1 mm apart) on the drop-casted film, which corresponds to the difference in microstructural ordering and it is complicated to characterize through the conventional spectroscopic techniques.


  • P3HT Nanofibrils Thin-Film Transistors by Adsorbing Deposition in Suspension

    Shuichi Nagamatsu, Masataka Ishida, Shougo Miyajima, Shyam S Pandey

    Materials  ( MDPI )  12 ( 21 ) 3643   2019.11  [Refereed]

     View Summary

    A novel film preparation method utilizing polymer suspension, entitled adsorbing deposition in suspensions (ADS), has been proposed. The poly(3-hexylthiophene) (P3HT) toluene solution forms P3HT nanofibrils dispersed suspension by aging. P3HT nanofibrils are highly crystallized with sharp vibronic absorption spectra. By the ADS method, only P3HT nanofibrils in suspension can be deposited on the substrate surface without any disordered fraction from the dissolved P3HT in suspension. Formed ADS film contains only the nanostructured conjugated polymer. Fabricated polymer thin-film transistor (TFT) utilizing ADS P3HT film shows good TFT performances with low off current, narrow subthreshold swing and large on/off current ratio


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Conference Prsentations (Oral, Poster) 【 display / non-display

  • Semitransparent Dye-Sensitized Solar Cells using Novel Blue- Colored Unsymmetrical Squaraine Dyes.

    Pritha Roy, Ajendra Kumar Vats, Shyam S. Pandey

    100th Annual Spring Meeting of Japan Chemical Society  (Tokyo University of Science, Noda Campus)  2020.03  -  2020.03  Chemical Society of Japan

  • Design and Synthesis of Novel NIR Dyes with Phosphonic Acid based Anchoring Groups for Dye-Sensitized Solar Cells

    Ajendra Kumar Vats, Shyam S. Pandey

    100th Annual Spring Meeting of Japan Chemical Society  (Tokyo University of Science, Noda Campus)  2020.03  -  2020.03  Chemical Society of Japan

  • Fabrication of anisotropic OTFT utilizing oriented DPP polymer blend film by FTM

    Satoru Namba

    67 Spring Meeting of Japan Applied Physics Society,  (Jochi University, Tokyo)  2020.03  -  2020.03  Japan Applied Physics Society

  • Investigation of molecular orientation in thin films of polythiophenes fabricated on airliquid interface

    Subhajit Jana, Rajiv Kr. Pandey, Nikita Kumari, Takaaki Manaka, Shyam S. Pandey, Rajiv Prakash

    67 Spring Meeting of Japan Applied Physics Society  (Jochi University, Tokyo)  2020.03  -  2020.03  Japan Applied Physics Society

  • Effect of dielectric interface on charge transport anisotropy in polymer thin-film transistors fabricated by friction transfer method

    Nikita Kumari, Manish Pandey, Shuichi Nagamatsu, Masakazu NakamuraShuzi Hayase and Shyam S. Pandey

    67 Spring Meeting of Japan Applied Physics Society  (Jochi University, Tokyo)  2020.03  -  2020.03  Japan Applied Physics Society

     View Summary

    Conjugated polymers (CPs) offer adequate freedom to improve the charge transport in their thin films by tuning their chemical structure or processing techniques aiming towards enhancing their crystallinity. Exploiting quasi 1-dimensional nature of CPs is one of the best possible approaches to improve the carrier transport by uniaxially orienting them along the channel of an organic field-effect transistor (OFET). Various solution-based approaches in order to orient the CPs leading to high-performance OFETs has been demonstrated, however, the limitations like need of good solubility of the CPs, surface wettability, pre-aggregation in solution, etc., are the bottleneck to generalize them. Moreover, inevitability of halogenated solvents for film fabrication may also lead to serious health and environmental hazards during large scale production. Friction transfer is a solvent-free processing technique to fabricate large-area oriented polymer thin films and can effectively be utilized to overcome aforementioned challenges. In this work, role of dielectric surface to control the anisotropic charge transport in the OFETs has been extensively investigated and considering the optical and electrical characteristics, a possible transport mechanism has been proposed.

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Industrial Property 【 display / non-display

  • Phthalocyanine dyes having trisiloxane-structure axial ligands, photoelectric converters containing them, and dye-sensitized solar cells using them

    Industrial Property No 2013-045530  Unexpectedly No 2014-172961  JAPAN

    Hayase, Shuji; Pandey Shyam Sudhir; Yamaguchi, Yoshihiro; Ochi, Noriaki;

  • Porphyrin pigments and dye-sensitized solar cells and photoelectric converters using same

    Industrial Property No 2012-114539  Unexpectedly No 2013-241500  JAPAN

    Hayase, Shuji; Pandey Shyam Sudhir; Yamaguchi, Yoshihiro; Ochi, Noriaki; Fujino, Kenichi; Okamoto, Etsuya; Komaya, Yohei

  • Phthalocyanine dyes, dye sensitized solar cells and photoconversion elements based on phthalocyanine dyes

    Industrial Property No 2012-114541  Unexpectedly No 2013-241502  JAPAN

    Hayase Shuzi, Pandey Shyam Sudhir, Yamaguchi Yoshihiro, Shiga, Fujino, Okamoto, Komaya Yohei

  • Polymethene precursors, squaraine dyes using these precursors, dye-sensitized solar cells and photoconversion elements based on these.

    Industrial Property No 2012-067436  Unexpectedly No 2013-199536  JAPAN

    Shuzi Hayase, Pandey Shyam Sudhir and Yamaguchi Yoshihiro

  • Dye-Adsorbed Semiconductor Electrode for dye sensitized solar cell, and process for production of dye adsorbed semiconductor electrode

    Industrial Property No PCT/JP2011/002753  Unexpectedly No WO2011155131 A1  JAPAN

    Shuzi Hayase, Shyam S. Pandey, Yuji Narutomi, Shinsuke Fujita, Akari Miyamoto,

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Lectures 【 display / non-display

  • Design and Development of NIR Dyes by Altering the Anchoring Groups aiming towards High Stability and Efficiency

    6th International Conference on Advanced Nanomaterials and Nanotechnology (ICANN2019) ( Indian Institute of Technology, Guwahati, Assam, India )  2019.12.18 

  • Nanomolecular Self-Assembly Control of Organic Semiconductors & Their Visualization by 2D Positional Mapping

    International Conference on Precision, Meso, Micro & Nano Engineering [COPEN-11] ( Indian Institute of Technology, Indore, India )  2019.12.14 

  • Molecular Orientation and Device Performance in Organic Electronic Devices: Control & Visualization

    7th International Symposium on Applied Engineering and Sciences (SAES2019) ( UNIVERSITI PUTRA MALAYSIA, SERDANG, SELANGOR, MALAYSIA )  2019.11.11 

  • Dye-Sensitized Solar Cells in the Realm of Future Energy Challenges: Materials Design & Device Engineering

    The 8th Joint Conference on Renewable Energy and Nanotechnology (JCREN-2019) ( Hasanuddin Universaity, Makassar, Indonesia )  2019.11.05 

  • Molecular Orientation and Its 2D Profiling for Organic Electronic Devices

    19th International Discussion and Conference on Nano Interface Controlled Electronic Devices (IDC-NICE 2019) ( Hokkaido University, Sapporo, Japan )  2019.10.10  Japan Society of Applied Physics

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Honors and Awards 【 display / non-display

  • Best Poster Award:Synthesis and Photovoltaic Characterization of NIR Sensitive Squaraine Dyes with Extended pi conjugation for Dye-Sensitized Solar Cells

    2019.07.13     JAPAN

    Winner: Ajendra Kumar Vats, Gaurav Kapil, Shuzi Hayase, Shyam S. Pandey

  • Best Presentation Award: Synthesis, Characterization and Adsorption behaviour of Unsymmetrical Squaraine Dyes Bearing Varying Anchoring Groups on Mesoporous TiO2

    2018.12.18     JAPAN

    Winner: Ajendra Kumar Vats*, Anusha Pradhan, Shuzi Hayase and Shyam S. Pandey

  • Orientation Characteristics in Ribbon Shaped Floating Thin-Films of Conjugated Polymers Prepared by Dynamic FTM

    2016.12.16     JAPAN

    Winner: Atul Tripathi*, Manish Pandey, Shyam. S. Pandey, Shuzi Hayase,Wataru Takashima, Shuichi Nagamatsu

  • "Organic-Inorganic Hybrid Solar Cells utilizing ZnO"

    2012.06.30     JAPAN

    Winner: Yamashita Daiki, Sandeep K. Das, Tanaka Hiroki, Tasaku Yuumi, Ogomi Yuhei, Pandey Shyam S, Yoshino Kenji and Hayase Shuzi

Grants-in-Aid for Scientific Research 【 display / non-display

  • Investigation pertaining to the stability of NIR dyes with efficient photoconversion by logical molecular design

    Grant-in-Aid for Scientific Research(C)

    Project Year:  2018.04  -  2021.03

    Project Number:  18K05300

  • Investigations pertaining to the development organic dyes with low energy barrier for charge injection and high photoconversion efficiency in NIR region

    Grant-in-Aid for Scientific Research(C)

    Project Year:  2014.04  -  2017.03

    Project Number:  26410206

Contracts 【 display / non-display

  • Morphology Control of Organic Materials for Nanobio and Electronics Devices

    Joint research

    Project Year:  2011.06  -  2013.03

  • Design, Exploration and Fabrication of Solar Cells Based on New Nanomaterials with High Conversion Efficiency, NANOCONV

    Joint research

    Project Year:  2010.10  -  2013.03


Activities of Academic societies and Committees 【 display / non-display

  • 2019.11

    Materials Research Society, Japan   Session Organizer, Session Chair and Presentation

  • 2017.12

    Material Research Society, Japan   Session Organizer, Session Chair and Oral Presentation

  • 2017.06

    9th International Conference on Materials for Advanced Technology (ICMAT-2017)   Session Organizer (Session-F), Session Chair (Session F-02) and Oral Presenter

  • 2016.12

    Material Research Society, Japan   Session Organizer (Symposium B1), Session Chair and Research Presentation

  • 2016.12

    International Conference on Computational Methods in Engineering and Health Sciences   Executive Committee Member and Research Presentation

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Social Contribution 【 display / non-display

  • Advanced Materials and Devices for Next Generation Photovoltaics

  • Special Lecture in English at Kitakyushu National College of Technology


     View Summary

    This was special lecture in English for Advanced Course Students in the Kitakyushu National College of Technology. Two lectures (90 min each) were conducted simultaneously on the same day. This was an attempt to familiarize the selected students about the technical knowledge in English about the next generation solar cells.

  • IITG-Kyutech Seminar