MItigating coulomb interactions improves transport in doped polymers

in collaboration with the ALIEN group at UMass Amherst, we show that adding nanoparticles with large dielectric constant can help mitigate enegetic disorder caused by carrier-dopant interactions and lead to large improvements in electrical conductivity of doped conjugated polymers. This work was recently published in Advanced Science:

Cameron’s work on thermal boundary conductance published in Nanotechnology

Cameron’s research on the thermal boundary conductance between 2D materials beyond graphene and 3D substrates, including amorphous SiO2 and crystalline GaN, has been published in a special issue of Nanotechnology: “Focus on 2D Materials for Microelectronic Devices and Nanoscale Heat Dissipation

Arnab’s work on graphene accepted in Nano Express


Arnab’s last PhD article on transport across extended grain boundaries in graphene is accepted in Nano Express. Here is a link to the article:
A large mismatch in the crystal orientations of adjacent grains in polycrystalline graphene could lead to large electrical resistivity across such GBs. However, in this work we show that due to the meandering nature of a GB, a few “special” regions of the GB provide conductive paths for the charge carriers to flow across them. We simulated 5000 identical GBs (i.e. GBs with the same roughness and correlation lengths) to report statistical mean and standard deviation of resistivities across GBs of varying length. Our results show that shorter GBs exhibit larger variation in resistivities as compared to the longer ones.

Adithya defends his dissertation. Congratulations Dr. Kommini!

Adithya defended his dissertation titled “TOWARDS HIGHER POWER FACTOR IN SEMICONDUCTOR THERMOELECTRICS: BANDSTRUCTURE ENGINEERING AND POTENTIAL BARRIERS,” which has led to a number of discoveries and papers, including our recent work on “Very high thermoelectric power factor near magic angle in twisted bilayer graphene,” now on arXiv:

Adithya’s work on Winger transport in 2D thermoelectrics published in Phys. Rev. Applied

In this work, we show that the thermoelectric power factor in 2D materials can be dramatically improved by adding periodic potential barriers, such as those depicted schematically in the image above. We find the optimal barrier configuration (height, width, and shape) for transport parallel and perpendicular to the barriers.