Speaker: Mrinomy Chini (Teerthanker Mahaveer University, India)

Abstract: There has been a significant increase in the interest in organic optoelectronics over the last 20 years, owing to significant advancements in material design and purification, which have resulted in a significant increase in material performance. Organic materials are nowadays being widely used in optoelectronic devices like organic thin-film transistors, LEDs, solar cells, detectors, photorefractive devices, and so on. The low cost of these materials, as well as the potential of room-temperature deposition from solution on large-area and/or different substrates, are among the technological promises. This presentation briefly highlights the rationale behind organic semiconductors design and synthesis, and their applications in organic field effect transistors (OFETs), dye-sensitized solar cells (DSSCs), and electrochemical supercapacitors. OFETs help us to measure the n-type and p-type charge carrier mobilities of organic semiconductors [1]. In the case of DSSCs, we have shown that the introduction of an efficient and precious platinum (Pt) free counter electrode made of nano-porous reduced graphene oxide (PG) and containing a PEDOT:PSS−PG composite on an FTO substrate, can be effectively employed as a counter electrode for DSSCs, owing to the demonstration of excellent I₃⁻ diffusion, remarkable photocatalytic activity, and better device performances along with desired stability [2]. Hydrothermally reduced PGs and conducting polyaniline (PANI) nanofiber composites (PGs–PANI) have shown capacitive behavior superior to their individual PANI and PGs counterparts. This is due to the synergistic effect of PANI and PGs in improving the performance of supercapacitors [3].

[1] M. K. Chini, C. Das and S. Chatterjee, Chem. Phys. Lett. 657, 26 (2016).

[2] V. Sudhakar, A. K. Singh, and M. K. Chini, ACS Appl. Electron. Mater. 2, 626 (2020).

[3] M. K. Chini and S. Chatterjee, FlatChem 1, 1 (2017).