37 citations · 147 across the 9 of their papers we have counts for
10 papers
Micro-gap thermo-photo-thermionics: An alternative approach to harvesting thermo-photons and its comparison with thermophotovoltaics
Ehsanur Rahman, Alireza Nojeh
This work investigates an alternative to thermophotovoltaics for harvesting thermal and optical energy via photon coupling and thermionic energy conversion. In this device, a heat…
Tuning the thermal conductivity of silicon nanowires by surface passivation
Céline Ruscher, Robinson Cortes-Huerto, Robert Hannebauer +3
Using large scale molecular dynamics simulations, we study the thermal conductivity of bare and surface passivated silicon nanowires (SiNWs). For the cross-sectional widths $w \le…
The Effects of Electronic and Photonic Coupling on the Performance of a Photothermionic-Photovoltaic Hybrid Solar Device
Ehsanur Rahman, Alireza Nojeh
This work presents a detailed analysis of the photothermionic-photovoltaic hybrid solar device. The electrons in this hybrid device gain energy from both the solar photons and ther…
Nanotube heat conductors under tensile strain: Reducing the three-phonon scattering strength of acoustic phonons
Daniel Bruns, Alireza Nojeh, A. Srikantha Phani +1
Acoustic phonons play a special role in lattice heat transport, and confining these low-energy modes in low-dimensional materials may enable nontrivial transport phenomena. By appl…
Harvesting Solar Thermal Energy With a Micro-gap Thermionic-Thermoelectric Hybrid Energy Converter: Model Development, Energy Exchange Analysis, and Performance Optimization
Ehsanur Rahman, Alireza Nojeh
We present a comprehensive analysis of a dual, micro-gap thermionic-thermoelectric hybrid energy converter by developing a detailed theoretical model of the system. The Space-charg…
Interplay Between Near-Field Radiative Coupling and Space Charge Effects in a Micro gap Thermionic Energy Converter under Fixed Heat Input
Ehsanur Rahman, Alireza Nojeh
We investigate the performance of a micro gap vacuum thermionic energy converter considering the loss mechanisms due to the space charge effect and interelectrode radiative heat tr…
Reduced thermal conductivity in molecular forests
Aashish Bhardwaj, A. Srikantha Phani, Alireza Nojeh +1
Heat propagation in quasi-one dimensional materials (Q1DMs) often appears paradoxical. While an isolated Q1DM, such as a nanowire, carbon nanotube, or polymer, can exhibit a high t…
Heat transport in carbon nanotubes: Length dependence of phononic conductivity from the Boltzmann transport equation and molecular dynamics
Daniel Bruns, Alireza Nojeh, A. Srikantha Phani +1
In this article, we address lattice heat transport in single-walled carbon nanotubes (CNTs) by a quantum mechanical calculation of three-phonon scattering rates in the framework of…
Adsorbate-enhanced field-emission from single-walled carbon nanotubes: a comparative first-principles study
Ehsanur Rahman, Alireza Nojeh
We report a comparative ab-initio study of different types of adsorbates and their adsorption mechanism on the field-emission performance of single-walled carbon nanotubes by analy…
Heat localization through reduced dimensionality
Mike Chang, Harrison D. E. Fan, Mokter M. Chowdhury +2
We present a model to show that heat propagation away from a local source depends strongly on dimensionality, leading to dramatic localization in low-dimensional systems. An exampl…