665 citations · 1.9k across the 27 of their papers we have counts for
27 papers
The Limits of Thermoelectric Performance with a Bounded Transport Distribution
Jesse Maassen
With the goal of maximizing the thermoelectric (TE) figure of merit , Mahan and Sofo [Proc. Natl. Acad. Sci. U.S.A. 93, 7436 (1996)] found that the optimal transport distributi…
First-principles analysis of intravalley and intervalley electron-phonon scattering in thermoelectric materials
Vahid Askarpour, Jesse Maassen
Intervalley collisions, which scatter electrons from one valley or band to another, can be detrimental to thermoelectric performance in materials with multiple valleys/bands. In th…
A Gate-All-Around Single-Channel In2O3 Nanoribbon FET with Near 20 mA/μm Drain Current
Zhuocheng Zhang, Zehao Lin, Pai-Ying Liao +12
In this work, we demonstrate atomic-layer-deposited (ALD) single-channel indium oxide (In2O3) gate-all-around (GAA) nanoribbon FETs in a back-end-of-line (BEOL) compatible process.…
A Nanometer-Thick Oxide Semiconductor Transistor with Ultra-High Drain Current
Zehao Lin, Mengwei Si, Vahid Askarpour +12
High drive current is a critical performance parameter in semiconductor devices for high-speed, low-power logic applications or high-efficiency, high-power, high-speed radio freque…
Thermoelectric calculations of ring-shaped bands in two-dimensional BiTe, BiSe and SbTe: a comparison of simple scattering approximations
Cameron Rudderham, Jesse Maassen
Materials with ring-shaped electronic bands are promising thermoelectric candidates, since their unusual dispersion shape is predicted to give large power factors. While previous c…
Impact of dimensional crossover on phonon transport in van der Waals materials: a case study of graphite and graphene
Patrick Strongman, Jesse Maassen
Using first-principles modeling, we investigate how phonon transport evolves in layered/van der Waals materials when going from 3D to 2D, or vice versa, by gradually pulling apart…
Analysis of simple scattering models on the thermoelectric performance of analytical electron dispersions
Cameron Rudderham, Jesse Maassen
Recent first-principles electron-phonon scattering calculations of heavily-doped semiconductors suggest that a simple DOS scattering model, wherein the electronic scattering rates…
Unusual thermoelectric transport anisotropy in quasi-2D, rhombohedral GeTe
Vahid Askarpour, Jesse Maassen
In this study, we calculate the =300 K scattering and thermoelectric transport properties of rhombohedral GeTe using first-principles modeling. The room-temperature phase of GeT…
Phonon transport across a Si-Ge interface: the role of inelastic bulk scattering
Jesse Maassen, Vahid Askarpour
Understanding phonon transport across heterojunctions is important to achieve a wide range of thermal transport properties. Using the McKelvey-Shockley flux method with first-princ…
LanTraP: A code for calculating thermoelectric transport properties with the Landauer formalism
Xufeng Wang, Evan Witkoske, Jesse Maassen +1
A code for calculating the semi-classical thermoelectric and electronic transport properties is described. It uses the Landauer transport theory, which is equivalent to the Boltzma…
Universal Behavior of the Thermoelectric Figure of Merit, zT, vs. Quality Factor
Evan Witkoske, Xufeng Wang, Jesse Maassen +1
To increase the performance of thermoelectric materials, the electronic parameters in the figure of merit must be improved. In this paper, we use full, numerical band structures an…
Theoretical overview of black phosphorus
Andrey Chaves, W. Ji, J. Maassen +2
We review the basic optical, electronic, optoelectronic, thermoelectric and mechanical properties of few-layer black phosphorus (BP), a layered semiconductor that can be exfoliated…
On the Calculation of Lorenz Numbers for Complex Thermoelectric Materials
Xufeng Wang, Vahid Askarpour, Jesse Maassen +1
A first-principles informed approach to the calculation of Lorenz numbers for complex thermoelectric materials is presented and discussed. Example calculations illustrate the impor…
Thermoelectric Band Engineering: The Role of Carrier Scattering
Evan Witkoske, Xufeng Wang, Vahid Askarpour +2
Complex electronic band structures, with multiple valleys or bands at the same or similar energies can be beneficial for thermoelectric performance, but the advantages can be offse…
Modeling quasi-ballistic transient thermal transport with spatially sinusoidal heating: a McKelvey-Shockley flux approach
Daniel Abarbanel, Jesse Maassen
Ballistic phonon effects, arising on length scales comparable to the mean-free-path, result in non-diffusive heat flow and alter the thermal properties of materials. Simple theoret…
Control of interlayer delocalization in 2H transition metal dichalcogenides
Kuang-Chung Wang, Teodor K. Stanev, Daniel Valencia +14
It is assessed in detail both experimentally and theoretically how the interlayer coupling of transition metal dichalcogenides controls the electronic properties of the respective…
Thermal Transport at the Nanoscale - A Fourier's Law vs. Phonon Boltzmann Equation Study
Jan Kaiser, Tianli Feng, Jesse Maassen +3
Steady-state thermal transport in nanostructures with dimensions comparable to the phonon mean-free-path is examined. Both the case of contacts at different temperatures with no in…
Auxetic Black Phosphorus: A 2D Material with Negative Poisson's Ratio
Yuchen Du, Jesse Maassen, Wangran Wu +3
The Poisson's ratio of a material characterizes its response to uniaxial strain. Materials normally possess a positive Poisson's ratio - they contract laterally when stretched, and…
Modeling ballistic effects in frequency-dependent transient thermal transport using diffusion equations
Jesse Maassen, Mark Lundstrom
Understanding ballistic phonon transport effects in transient thermoreflectance experiments and explaining the observed deviations from classical theory remains a challenge. Diffus…
Gate-Tunable and Thickness-dependent Electronic and Thermoelectric Transport in few-layer MoS2
Morteza Kayyalha, Jesse Maassen, Mark Lundstrom +2
Over the past few years, there has been a growing interest in layered transition metal dichalcogenides (TMD) such as molybdenum disulfide (MoS2). Most studies so far have focused o…
Anisotropic in-plane thermal conductivity observed in few-layer black phosphorus
Zhe Luo, Jesse Maassen, Yexin Deng +5
Black phosphorus has been revisited recently as a new two-dimensional material showing potential applications in electronics and optoelectronics. Here we report the anisotropic in-…
A Simple Boltzmann Transport Equation for Ballistic to Diffusive Transient Heat Transport
Jesse Maassen, Mark Lundstrom
Developing simplified, but accurate, theoretical approaches to treat heat transport on all length and time scales is needed to further enable scientific insight and technology inno…
Steady-State Heat Transport: Ballistic-to-Diffusive with Fourier's Law
Jesse Maassen, Mark Lundstrom
It is generally understood that Fourier's law does not describe ballistic phonon transport, which is important when the length of a material is similar to the phonon mean-free-path…
Straining Graphene by Chemical Vapour Deposition Growth on Copper
Victor Yu, Eric Whiteway, Jesse Maassen +1
Strain can be used as an alternate way to tune the electronic properties of graphene. Here we demonstrate that it is possible to tune the uniform strain of graphene simply by chang…