Vigneswaran Ravi

PhD thesis: Thermoelectric physics of conjugated polymer thermoelectric materials

Research interests:

1. Organic Semiconductors: Physics and Applications
2. Device Physics
3. Nano-fabrication and Characterisation
4. Bioelectronics and Sensing

I will be investigating the thermoelectric physics of conjugated polymer materials, with a focus on strategies to enhance the Seebeck coefficient in model systems. A central aspect of this project will be the exploration of a recently identified mechanism that relies on controlling electron–ion coupling in organic mixed ionic–electronic conductors. By studying how this interaction affects charge transport and ionic dynamics, I will aim to gain a deeper understanding of the factors governing thermoelectric performance.

The research will involve systematic investigations of different polymer model systems to establish the underlying structure– property relationships. These insights will help reveal how microscopic features of the materials can be tuned for improved efficiency. The project will be primarily experimental, employing spectroscopic, structural, and transport measurements, but will also integrate aspects of device and materials modelling to complement and guide the experimental work.

Who or what inspired you to pursue your research interests?

My research journey has been shaped by a continuous evolution of questions. In school, molecular orbital theory first sparked my fascination with how orbitals interact. This curiosity deepened during my semester project, where I explored quasiparticle interactions through plasmon–exciton coupling in Au nanorod–MoS₂ hybrids. Motivated by the remarkable physics of lowdimensional materials and the desire to work on applications, I pursued my master’s thesis on graphene-based magnetic field sensors. This experience reinforced my belief that an interdisciplinary approach—linking fundamental understanding with practical utility—is essential in research. Over time, I became inspired by environmentally friendly and flexible materials, which now drives my PhD on the thermoelectric physics of conducting polymers.