Eminent scientists from Japan delivered lectures on need, synthesis and applications of solar cells under the light of the current research. Although there are numerous other methods of generating electricity, solar cells have a number of considerable advantages for consumers, producers, and the environment.

Solar cells are clean – while generating electricity from sunlight, solar cells produce virtually no pollution, whereas burning fossil fuels releases large quantities of toxic gases into the atmosphere. Knowing the importance of this technology and need to expand the horizon up to the consumers, it is necessary to have exchange of ideas between eminent scientists of different countries actively involved in such projects.

Prof. Keiichi Kaneto from Graduate School of Life Science and System Engineering, Kyushu Institute of Technology delivered lecture on “Novel Fabrication of Anisotropic Polymer Films for Organic Field Effect Transistors and Organic Light Emitting Diodes”. In his talk, he discussed two novel fabrication methods recently developed in his lab namely, Dielectric Barrier electrophoretic deposition (DBEPD) on insulators and floating film transfer method (FTM). The films are used to fabricate organic electronics devices.

The Electrophoretic deposition (EPD) of colloidal poly(3-hexylthiophen), P3HT on a gate insulator is used to fabricate organic field effect transistors (OFET). The FTM, has been carried out for Poly(3,3-didodecyl quaterthiophene) (PQT-12), Poly(9,9-dioctyl fluorene) (PFO), poly(9,9’ dioctyl-fluorene-alt-bithiophene) copolymer (F8T2), and Poly(9,9- dioctylfluorene-alt-benzothiadiazole) (F8BT) thin films.

The light emitting diodes are also fabricated by using PFO FTM, which exhibited polarized light emission

Prof. Mitsuyoshi Onoda from Graduate School of Engineering, University of Hyogo delivered lecture on “Conduction current behavior during electrophoretic deposition of conjugated polymer”. He gave an insight on electrophoretic deposition of a fluorene-based conductive polymer, poly[(9,9-dioctyl-,7-ivinylenefluorenylene)-alt-{2-methoxy- 5-(2-ethylhexyloxy)-1, 4-phenylene}], (PDOF-MEHPV).

It was also clarified that the transient electric current during the electrophoretic deposition strongly depends on the shape of the vessel. With the thin slab vessel geometry, which provides a simple path for the colloidal particles during deposition as well as minimum suspension consumption, transit currents reveling clear plateaus and breaks have been recorded.

In the same line, Prof. Shuji Hayase from Kyushu Institute of Technology spoke on “Back contact type dye-sensitized solar cells with cylinder shape-High efficiency cell by using optical wave guide effect and their optical simulation”. He focused on cylindrical solar cells because the shape allows easy and perfect encapsulation which is one of the major problems of the cell.

The comparative analysis between cylindrical dye-sensitized solar cells and flat dye-sensitized solar cells revealed that cylinder type DSC was 1.3 times larger than the latter, proving the effectiveness of the same.

In the last, Prof. S. S. Pandey from Graduate School of Life Science and System Engineering, Kyushu Institute of Technology delivered lecture on “Design & Development of Squaraine Sensitizers for the Efficient Dye-Sensitized Solar Cells”. He discussed over dye-sensitized solar cells (DSSCs) which has emerged as one of the cheap alternatives to the traditional silicon solar cells for harnessing the solar energy.

It was highly enlighting to learn about the design and development of symmetrical and unsymmetrical Squaraine dyes for the photon harvesting in the far-red to NIR wavelength region.

The seminar was coordinated by Prof. B. D. Malhotra, Department of Bio Technology, a renowned scientist, who has recently joined DTU after superannuation from NPL. A larger number of UG, PG students and faculty members of the Department attended the seminar. DTU has organized this seminar for future collaboration with Japanese research groups to meet the unmet demand of the society in India.

Source: AglaSem