Publications

2024

Perspectives and progress on wurtzite ferroelectrics: Synthesis, characterization, theory, and device applications

J. Casamento, S. Baska, D. Behrendt, S. Calderon, D. Goodling, J. Hayden, F. He, L. Jacques, S.H. Lee, W. Smith, A. Suceava, Q. Tran, X. Zheng, R. Zu, T. Beechem, I. Dabo, E. Dickey, G. Esteves, V. Gopalan, M. Henry, J. Ihlefeld, T. Jackson, S. Kalinin, K. Kelley, Y. Liu, A. Rappe, J. Redwing, S. Trolier-McKinstry, J.P. Maria. Applied Physics Letters. (124) 080501. 2024.

Photoinduced patterning of oxygen vacancies to promote the ferroelectric phase of Hf0.5Zr0.5O2

T. Beechem, F. Vega, S. Jaszewski, B. Aronson, K. Kelley, J. Ihlefeld. Applied Physics Letters. 124, 062902. 2024.

2023

Deposition and dielectric characterization of highly oriented V2O5 thin films

L. Jacques, S. Shetty, F. Vega, Y. Liu, B. Aronson, T. Beechem, S. Trolier-Mckinstry. MRS Communications. 2023.

Material characteristics governing in-plane phonon-polariton thermal conductance

J. Minyard, T. Beechem. Journal of Applied Physics. (134) 165102. 2023.

*Selected as Feature Article.

The Role of Optical Phonon Confinement in The Infrared Dielectric Response of III-V Superlattices

J. Matson, MD Alam, G. Varnavides, P. Sohr, S. Knight, V. Darakchieva, M. Stokey, M. Schubert, A. Said, T. Beechem, P. Narang, S. Law, J. Caldwell. Advanced Materials. 2023.

Oxygen vacancy contributions to the electrical stress response and endurance of ferroelectric hafnium zirconium oxide thin films

A. Mallik, M. Lennox, T. Beechem, J. Ihlefeld, N. Shukla. Applied Physics Letters (122) 123902. 2023.

*Selected as Feature Article.

Defect structures as a function of ion irradiation and annealing in LiNbO3

E. Lang, T. Beechem, A. McDonald, T. Friedmann, R.H. Olsson, J. Stevens, B. Clark, K. Hattar. Thin Solid Films (768) 139719. 2023.

Interface-Independent sound speed and thermal conductivity of atomic-layer-deposition-grown AlN/Al2O3 multilayers with varying oxygen composition

M.D. Hoque, I. Brummel, E. Hoglund, J. Dionne, K. Aryana, J. Tomko, J. Gaskins, D. Hirt, S. Smith, T. Beechem, J. Howe, A. Giri, J. Ihlefeld, P. Hopkins. Physical Review Materials (7) 025401. 2023.

Growth of Ultrathin Bi2Se3 Films by Molecular Beam Epitaxy

S. Nasir, W. Smith, T. Beechem, S. Law. Journal of Vacuum Science and Technology A. (41) 012202. 2023.

2022

Detection of High Energy Ionizing Radiation Using Deeply Depleted Graphene-Oxide-Semiconductor Junction

I. Ruiz, G. Vizkelethy, A. McDonald, S. Howell, P. Thelen, M. Goldflam, T. Beechem. Journal of Applied Physics. (132) 184503. 2022.

Growth-Microstructure-Thermal Property Relations in AlN Thin Films

Y. Song, C. Zhang, J.S. Lundh, H. Luang, Y. Zheng, Y. Zhang, M. Park, T. Mirabito, R. Beaucejour, N. McIllwaine, G. Esteves, T. Beechem, C. Moe, R. Dargis, J. Jones, J. Leach, R. Lavelle, D. Snyder, J.P. Maria, R. Olsson, J. Redwing, A. Ansari, J. Hwang, X. Wang, B. Foley, S. Trolier-McKinstry, S. Choi. Journal of Applied Physics. (132) 175108. 2022.

Spectral and Polarization Based Imaging in Deep-Ultraviolet Excited Photoelectron Microscopy

T. Beechem, S. Smith, R. G. Copeland, F. Liu, T. Ohta. Review of Scientific Instruments. (93) 053701. 2022.

Emergent Interface Vibrational Structure of Oxide Superlattices

E. Hoglund, D. Bao, A. O'Hara, S. Makarem, Z. Piontkowski (PD), J. Matson, A. Yadav, R. Haisimaier, R. Engel-Herbert, J. Ihlefeld, J. Ravichandran, R. Ramesh, J. Caldwell, T. Beechem, J. Tomko, J. Hachtel, S. Pantelides, P. Hopkins, J. Howe. Nature. (601) 556. 2022.

2021

Effects of Strain, Disorder, and Coulomb Screening on Free-Carrier Mobility in Doped Cadmium Oxide

Z. Piontkowski, E. Runnerstrom, A. Cleri, A. McDonald, J. Ihlefeld, C. Saltonstall, J.P. Maria, T. Beechem. Journal of Applied Physics. (130) 195105. 2021. Selected as an “Editor’s Pick.”

Phonon engineering of Boron Nitride via Isotopic Enrichment

M. He, L. Lindsay, T. Beechem, T. Folland, J. Matson, K. Watanabe, A. Zavalin, A. Ueda, W. Collins, T. Taniguchi, J.

Caldwell. Journal of Materials Research. (36) 4394. 2021.

Stress- and Time-Dependent Formation of Self-Lubricating In-Situ Carbon (SLIC) Films on Catalytically-Active Noble Alloys

M. Jones, F. Del Rio, T. Beechem, A. McDonald, T. Babuska, M. Dugger, M. Chandross, N. Argibay, J. Curry. JOM. 2021.

Thermal Conductivity of Aluminum Scandium Nitride for 5G Mobile Applications and Beyond

Y. Song (G), C. Perez (G), G. Esteves, J.S. Lundh (G), C. Saltonstall (PD), T. Beechem, J. Yang, K. Ferri (G), J. Brown, Z. Tang, J.P. Maria, D. Snyder, R.H. Olsson, B. Griffin, S. Trolier-McKinstry, B. Foley, S. Choi. ACS Applied Materials and Interfaces. (13) 19031. 2021.

2020

Thermal Conductivity of (Ge2Sb2Te5)1-xCx

E. Scott (G), E. Ziade, C. Saltonstall (PD), A. McDonald, M. Rodriguez, P. Hopkins, T. Beechem, D. Adams. Journal of Applied Physics. (128) 15, 155106. 2020.

Enhancing Graphene Plasmonic Device Performance via Its Dielectric Environment

A. Jarzembski (PD), M. Goldflam, I. Ruiz, A. Siddiqui, T. Beechem. Physical Review Applied (14) 3 034044. 2020.

Photo-Physics and Electronic Structure of Lateral Graphene/MoS2 and Metal/MoS2 Junctions

S. Subramanian (G), Q. Campbell, S. Moser, J. Kiemle, P. Zimmerman, P. Siefert, F. Sigger, D. Sharma, H. Al-Sadeg, M. Labella, D. Waters, R. Feenstra, R. Koch, C. Jozwiak, A. Bostwick, E. Rotenberg, I. Dabo, A. Holleitner, T. Beechem, U. Wurstbauer, J. Robinson. ACS Nano. (14) 16663. 2020.

K-Means-Driven Gaussian Process Data Collection for Angle-Resolved Photoemission Spectroscopy

C. Melton, M. Noack, T. Ohta, T. Beechem, J. Robinson, X. Zhang, A. Bostwich, C. Jozwiak, R. Koch, P. Zwart. Machine Learning: Science and Technology. (1) 4, 045015. 2020.

Complexion Dictated Thermal Resistance With Interface Density in Reactive Metal Multilayers

C. Saltonstall (PD), Z. McClure (G), M. Abere, D. Guzman, S. Reeve, A. Strachan, P. Kotula, D. Adams, and T. Beechem. Physical Review B (101) 245422. 2020.

Monolithically Fabricated Tunable Long-Wave Infrared Detectors Based on Dynamic Graphene Metasurfaces

M. Goldflam (PD), I. Ruiz, S. Howell, A. Tauke-Pedretti, E. Anderson, J. Wendt, P. Finnegan, S. Hawkins, W. Coon, T. Fortune, E. Shaner, C. Kadlec (G), J. Olesberg, J. Klem, P. Webster, M. Sinclair, J. K. Kim, D. Peters, and T.E. Beechem. Applied Physics Letters (116) 191102. 2020.

Interdependence of Electronic and Thermal Transport in AlxGa1-xN Channel HEMTs

B. Chatterjee (G), J. Lundh (G), Y. Song, D. Shoemaker, A. Baca, R. Kaplar, T. Beechem, C. Saltonstall, A. Allerman, A. Armstrong, B. Klein, A. Bansal, H. Seyf, D. Talreja, A. Pogrebnyakov, E. Heller, V. Gopalan, A. Henry, J. Redwing, B. Foley, S. Choi. IEEE Electron Device Letters (41) 461. 2020.

Nanoscale Electro-Thermal Interactions in AlGaN/GaN High Electron Mobility Transistors

B. Chatterjee (G), C. Dundar, T. Beechem, E. Heller, D. Kendig, H. Kim, N. Donmezer, S. Choi. Journal of Applied Physics (127) 044502. 2020.
* Selected as a “Featured Article”

2019

Imaging Atomically Thin Semiconductors Beneath Dielectrics via Deep Ultraviolet Photoemission Electron Microscopy

M. Berg, F. Liu, S. Smith, R.G. Copeland, C. Chan, A. Mohite, T. Beechem, T. Ohta. Physical Review Applied (12) 6, 064064. 2019.

Influence of Spatial Dispersion on Spectral Tuning of Phonon-Polaritons

T. Beechem, C. Saltonstall (PD), T. Gilbert (G), J. Matson (G), F. Ugwu, R. Kasica, F. Bezares, J. Valentine, J. Caldwell. Physical Review B (100) 20. 205419. 2019.

Interface Defect Engineering for Improved Graphene-Oxide-Semiconductor Junction Photodetectors

I. Ruiz, T. Beechem, S. Smith, P. Dickens, E. Paisley, J. Shank, S. Howell, R. Sarma, B. Draper, M. Goldflam. ACS Applied Nano Materials. 2019.

Multidimensional Thermal Analysis of an Ultrawide Bandgap AlGaN Channel High Electron Mobility Transistor

J. Lundh (G), B. Chatterjee (G), Y. Song, A. Baca, R. Kaplar, T. Beechem, A. Allerman, A. Armstrong, B. Klein, A. Bansal, D. Talreja, A. Pogrebnyakov, E. Heller, V. Goplan, J. Redwing, B. Foley, S. Choi. Applied Physics Letters (115) 153503. 2019.

Thermal Conductivity and Phonon Scattering Processes of ALD Grown PbTe–PbSe Thermoelectric Thin Films

M. DeCoster(G), X. Chen, K. Zhang, C. Rost, E. Hoglund(G), J. Howe, T. Beechem, P. Hopkins. Advanced Functional Materials. 1904073. 2019.

Effect of Stresses on the Dielectric and Piezoelectric Properties of Pb(Zr0.52Ti0.48)O3 Thin Films

K. Coleman(G), J. Walker, T. Beechem, S. Trolier-McKinstry. Journal of Applied Physics (126) 034101. 2019.
* Selected as an “Editor’s Pick”

Uncertainty in Linewidth Quantification of Overlapping Raman Bands

C. Saltonstall (PD), T. Beechem, J. Amatya, J. Floro, P. Norris, P. Hopkins. Review of Scientific Instruments (90) 013111. 2019.

2018

Semiconductor Hyperbolic Metamaterials at the Quantum Limit

I. Montano, S. Campione, J. Klem, T. Beechem, O. Wolf, M. Sinclair, T.S. Luk. Scientific Reports (8) 16694. 2018.

Tunable Infrared Devices via Ferroelectric Domain Reconfiguration

T. Beechem, M. Goldflam, M. Sinclair, D. Peters, A. McDonald, E. Paisley, D.B. Burckel, P. Finnegan, A. Kitahara, D. Drury, J.W. Kim, Y. Choi, P. Ryan, J. Ihlefeld. Advanced Optical Materials. 1800862. 2018.

Unraveling Chemical Interactions between Titanium and Graphene for Electrical Contact Applications

K. Freedy, T. Beechem, P. Litwin, M. Gabriela Sales, M. Huang, R. Ruoff, S. McDonnel. ACS Applied Nano Materials (1) 4828. 2018.

Polysulfide Speciation in the Bulk Electrolyte of a Lithium Sulfur Battery

J. McBreyer, T. Beechem, C. Appblet, F. Garzon. Journal of the Electrochemical Society (165) A876. 2018.

Tunable Dual-Band Graphene-Based Infrared Reflectance Filter

M. Goldflam, I. Ruiz, S. Howell, J. Wendt, M. Sinclair, D. Peters, T. Beechem. Optics Express (26) 8532. 2018.

Effects of Deposition Temperature and Ammonia Flow on Metal-Organic Chemical Vapor Deposition of Hexagonal Boron Nitride

A. Rice, A. Allerman, M. Crawford, T. Beechem, T. Ohta, C. Spataru, J. Figiel, M. Smith. Journal of Crystal Growth (485) 90. 2018.

2017

Chelant Enhanced Solution Processing for Wafer Scale Synthesis of Transition Metal Dichalcogenide Thin Films

R. Ioncescu, B. Campbell, R. Wu, E. Aytan, A. Patalano, I. Ruiz, S. Howell, A. McDonald, T. Beechem, A. Mkhoyan, M. Ozkan, C. Ozcan. Scientific Reports (7) 6419. 2017.

Nanoscale Carbon Modified α-MnO2 Nanowires: Highly Active and Stable Oxygen Reduction Electrocatalysts with Low Carbon Content

J. Vigil, T. Lambert, J. Duay, C. Delker, T. Beechem, B. Swartzentruber. ACS Applied Materials and Interfaces. (10) 2040 2017.

Graphene-Insulator-Semiconductor Junction for Hybrid Photodetection Modalities

S. Howell, I. Ruiz, P. Davids, R. Harrison, S. Smith, M. Goldflam, J. Martin, N. Martinez, T. Beechem. Scientific Reports. (7) 14651. 2017.

Experimental Determination of the Ionization Energies of MoSe2, WS2, and MoS2 on SiO2 Using Photoemission Electron Microscopy

K. Keyshar, M. Berg, X. Zhang, R. Vajtai, G. Gupta, C. Chan, T. Beechem, P. Ajayan, A. Mohite. T. Ohta. ACS Nano. (11) 8223. 2017.

Visibility of Dielectrically Passivated Graphene Film

I. Ruiz, M. Goldflam, T. Beechem, A. McDonald, B. Draper, S. Howell. Optics Letters. (42) 2850. 2017.

Designing Graphene Absorption in a Multispectral Plasmon-Enhanced Infrared Detector

M. Goldflam, Z. Fei, I. Ruiz, S. Howell, P. Davids, D. Peters, T. Beechem. Optics Express. (25) 12400. 2017.

Dynamic Wavelength-Tunable Photodetector Using Subwavelength Graphene Field-Effect Transistors

F. Leonard, C. Spataru, M. Goldflam, D.W. Peters, T. Beechem. Scientific Reports (7) 45873. 2017.

2016

Size Dictated Thermal Conductivity of GaN

T. Beechem, A. McDonald, E. Fuller, A. Talin, C. Rost, J-P. Maria, J. Gaskins, P. Hopkins. Journal of Applied Physics (120) 095104. 2016.

Self-Heating Induced Failure in Scalable Graphene Devices

T. Beechem, R. Shaffer, J. Nogan, A. Hamilton, A. McDonald, T. Ohta, S. Howell. Scientific Reports (6) 26457. 2016.

Molecular Beam Epitaxy Growth of SrO Buffer Layers on Graphite and Graphene for the Integration of Complex Oxides

A. Ahmed, H. Wen, T. Ohta, I. Pinchuk, T. Beechem, R. Kawakami. Journal of Crystal Growth (447) 5. 2016.

Thermal Design and Characterization of Heterogeneously Integrated InGaP/GaAs HBTs

S. Choi, G. Peake, G. Keeler, G. Geib, R. Birggs, T. Beechem, R. Shaffer, J. Clevenger, G. Patrizi, J. Klem, A. Tauke-Pedretti, C. Nordquist. IEEE Transactions on Components, Packaging, and Manufacturing Technology (6) 740. 2016.

Measuring Li+ Inventory Losses in LiCoO2/Graphite Cellsusing Raman Microscopy

C. Snyder, C. Apblett, A. Grillet, T. Beechem, D. Duquette. Journal of the Electrochemical Society. (163) A1036. 2016.

Size Effects on the Thermal Conductivity of Amorphous Silicon Thin Films

J. Braun, C. Baker, M. Elahi, K. Artyushova, T. Beechem, P. Norris, Z. Leseman, J. Gaskins, P. Hopkins. Physical Review B Rapid Communications. (93) 140201. 2016.

Thermal Conductivity of Turbostratic Carbon Nanofiber Networks

M. Bauer, C. Saltonstall, Z. Leseman, T. Beechem, P. Hopkins, P. Norris. Journal of Heat Transfer. (138) 061302. 2016.

2015

Oxidation of Ultrathin GaSe

T. Beechem, B. Kowalski, M. Brumbach, A. McDonald, C. Spataru, S. Howell, T. Ohta, J. Pask, N. Kalugin. Applied Physics Letters (107) 173103. 2015.

Thermal Transport in Tantalum Oxide Films for Memristive Applications

C. Landon, H.T. Wilke, M. Brumbach, G. Brennecka, M. Blea-Kirby, J. Ihlefeld, M. Marinella, T. Beechem. Applied Physics Letters (107) 023108. 2015.

Electrodeposited NixCo3- xO4 Nanostructured Films as Bifunctional Oxygen Electrocatalysts

T. Lambert, J. Vigil, S. White, D. Davis, S. Limmer, P. Burton, E. Coker, T. Beechem, M. Brumbach. Chemical Communications. 2015.

Invited Review Article: Error and Uncertainty in Raman Thermal Conductivity Measurements

T. Beechem, L. Yates, S. Graham. Review of Scientific Instruments (86) 041101. 2015.
* Selected as Cover Article

Thermal Flux Limited Electron Kapitza Conductance in Copper-Niobium Multilayer

R. Cheaito, K. Hattar, J. Gaskins, A. Yadav, J. Duda, T. Beechem, J. Ihlefeld, E. Piekos, J. Baldwin, A. Misra, P. Hopkins. Applied Physics Letters (106) 093114. 2015

2014

Untangled Planarized Arrays of Aligned Multiwall Carbon Nanotubes with Ohmic Back Contacts

C. Rochford, S.J. Limmer, S. Howell, T. Beechem, M. Siegal. Journal of Materials Research. 2014.

Evidence of Defects Increasing the Thermal Boundary Conductance Across Aluminum/Silicon Interfaces Subjected to Proton Irradiation

C. Gorham, K. Hattar, R. Cheaito, J. Duda, J. Gaskins, T. Beechem, J. Ihlefeld, L. Biedermann, E. Piekos, D. Medlin, P. Hopkins. Physical Review B (90) 024301. 2014.

Thermal Boundary Conductance Between Al Films and GaN Nanowires Investigated with Molecular Dynamics

X. Zhou, R. E. Jones, P. Hopkins, T. Beechem. Phys. Chem. Chem. Phys. (16) 9403. 2014.

Rotational Disorder in Twisted Bilayer Graphene

T. Beechem, T. Ohta, B. Diaconescu, J.T. Robinson. ACS Nano (8) 1665. 2014.

Lithographically Defined Porous Ni-carbon Nanocomposite Supercapacitors

X. Xiao, T. Beechem, D.R. Wheeler, D. B. Burkel, R. Polsky. Nanoscale (6) 2629. 2014.
* Selected as Cover Article

2013

Single Element Raman Thermometry

C. Saltonstall, J. Serrano, P. Norris, P. Hopkins, T. Beechem. Review of Scientific Instruments (84) 064903. 2013.

Design of Robust On-Chip Drain Modulators for Monolithic Pulsed Power Amplifiers

C. Rodenbeck, D. Bryant, R. Eye, C. Sandoval, N. Young. T. Beechem, R. Knudson, D. Allen, G. Brehm, K. Peterson, T. Mendenhall. IEEE Microwave and Wireless Components Letters (23) 267. 2012.

Self-Limiting Monomolecular Electrochemical Surface Functionalization of Graphene with Trifluoromethylphenylene

C. Chan, T. Beechem, M. Brumbach, D. R. Wheeler, K. Stevenson. Journal of Physical Chemistry C. (117) 12038. 2013.

Assessing Thermal Damage in Silicon PN-Junctions Using Raman Thermometry

T. Beechem, J. Serrano, A. McDonald, S. Mani. Journal of Applied Physics. (113) 123106. 2013.

Electronic Hybridization of Large-Area Stacked Graphene Films

J.T. Robinson, S. Schmucker, C.B. Diaconescu, J. P. Long, J. Culbertson, T. Ohta, A. Friedman, T. Beechem. ACS Nano (7) 637. 2013.
* Selected as “Editor’s Choice” in Science (339) Issue 6118

2012

Evidence for Interlayer Coupling and Moiré Periodic Potentials in Twisted Bilayer Graphene

T. Ohta, P. Feibelman, J.T. Robinson, A. Bostwick, E. Rotenberg, T. Beechem. Physical Review Letters (109) 186807. 2012.

Experimental Investigation of Size Effects on the Thermal Conductivity of Silicon-Germanium Alloy Thin Films

R. Cheaito. J. Duda, T. Beechem, K. Hattar, J. Ihlefeld, D.L. Medlin, M. Rodriguez, M. Campion, E. Piekos, P. Hopkins. Physical Review Letters (109) 195901. 2012.

Bidirectionally Tuning Kapitza Conductance Through the Inclusion of Substitutional Impurities

J. Duda, T. English, E. Piekos, T. Beechem, T. Kenny, P. Hopkins. Journal of Applied Physics (112) 073519. 2012.

Three Dimensional Nickel-Graphene/Core-Shell Electrodes

X. Xiao, J. Michael, T. Beechem, A. McDonald, M. Rodriguez, M. Brumbach, T. Lambert, C. Washburn, J. Wang,S.Brozik, D.R. Wheeler, D.B. Burkel, and R. Polsky. Journal of Materials Chemistry. September 2012.
* Featured on Cover

Long-Range Atomic Ordering and Variable Interlayer Interactions in Two Overlapping Graphene Lattices with Stacking Misorientations

T. Ohta, T. Beechem, J. Robinson, G. Kellogg. Physical Review B (85) 075415. 2012.

Lithographically Defined Three-Dimensional Graphene Nanostructures

X. Xiao, T. Beechem, M. Brumbach, T. Lambert, D. Davis, J. Michael, C. Washburn, J. Wang, S. Brozik, D.R. Wheeler, D.B. Burkel, R. Polsky. ACS Nano. (6) 3573. 2012.

Strategies for Tuning Phonon Transport in Multilayered Structures Using a Mismatch-based Particle Model

N. Le, J. Duda, T. English, P. Hopkins, T. Beechem, P. Norris. Journal of Applied Physics (111) 084310. 2012.

Manipulating Thermal Conductance at Metal-Graphene Contacts via Chemical Functionalization

P. Hopkins, M. Baraket, E. Barnat, T. Beechem, S. Kearney, J. Duda, J.T. Robinson, S. Walton. NanoLetters (12) 590. 2012.

2011

Strain and Charge Carrier Coupling in Epitaxial Graphene

D. Schmidt, T. Ohta, T. Beechem. Physical Review B (84) 235422. 2011.
* 2011 WiTec Paper Award

Raman Thermometry of Microdevices: Comparing Methods to Minimize Error

T. Beechem, J. Serrano. Spectroscopy. (26) 36. 2011.
* Featured on Cover

Influence of Anisotropy on Thermal Boundary Conductance at Solid Interfaces

P. Hopkins, T. Beechem, J. Duda, K. Hattar, J. Ihlefeld, M. Rodriguez, E. Piekos. Physical Review B (84) 125408. 2011.

Carotenoid Distribution in Living Cells of Haematococcus pluvialis (Chlorophyceae)

A. Collins, H. Jones, T. Beechem, J. Timlin, Q. Hu, D. Han. Plos One. 2011.

Lithographically-Defined 3D Porous Networks as Active Substrates for Surface Enhanced Raman Scattering

X. Xiao, J. Nogan, T. Beechem, G. Montano, C. Washburn, J. Wang, S. Brozik, D. Wheeler, B. Burkel, R. Polsky. Chem Commun. 47 9858. 2011.

Magnetotransport Properties of Quasi-Free-Standing Epitaxial Graphene Bilayer on SiC: Evidence for Bernal Stacking

K. Lee, S. Kim, M. S. Points, T. Beechem, T. Ohta, E. Tutuc. Nanoletters (11) 3624. 2011.

Reduction in Thermal Boundary Conductance Due to Proton Implantation in Silicon and Sapphire

P. Hopkins, K. Hattar, T. Beechem, J. Ihlefeld, D. Medling, E. Piekos. Applied Physics Letters (98) 231901. 2011.

2010

Contribution of Optical Phonons to Thermal Boundary Conductance

T. Beechem, J. Duda, P. Hopkins, P. Norris. Applied Physics Letters (97) 061907. 2010.

Role of Dispersion on Phononic Thermal Boundary Conductance

J. Duda, T. Beechem, J. Smoyer, P. Norris, P. Hopkins. Journal of Applied Physics (108) 073515. 2010.

Electrostatic Transfer of Patterned Epitaxial Graphene From SiC(0001) to Glass

L. Biedermann, T. Beechem, A. J. Ross III, T. Ohta, S. Howell. New Journal of Physics (12) 125016. 2010.

Effects of Surface Roughness and Oxide Layer on the Thermal Boundary Conductance at Aluminum/Silicon Interfaces

P. Hopkins, L. Phinney, JR Serrano, T. Beechem. Physical Review B (82) 085307. 2010.

Ultrafast Thermoelectric Properties of Gold Under Conditions of Strong Electron-Phonon Nonequilibrium

P. Hopkins, M. Bauer, J. Duda, J. Smoyer, T. English, P. Norris, T. Beechem, D. Stewart. Journal of Applied Physics (108) 104907. 2010.

Phonon Scattering and Velocity Considerations in the Minimum Phonon Thermal Conductivity of Layered Solids Above the Plateau

P. Hopkins. T. Beechem. Nanoscale and Microscale Thermophysical Engineering (14) 51. 2010.

Inelastic Phonon Interactions at Solid-Graphite Interfaces

J. Duda, P. Hopkins, T. Beechem, J. Smoyer, P. Norris. Superlattices and Microstructures (47) 550. 2010.

Effects of Sub-Conduction Band Excitations on Thermal Conductance at Metal-Metal Interfaces

P. Hopkins, T. Beechem, J. Duda, J. Smoyer, and P. Norris. Applied Physics Letters (96), 011907. 2010.

2009

Predictions of Thermal Boundary Conductance for Disordered Systems of Solids and Interfaces

T. Beechem and P. Hopkins. Journal of Applied Physics (106) 124301. 2009.

Assessment of Stress Contributions in GaN High Electron Mobility Transistors Using Raman Spectroscopy

T. Beechem, A. Christensen, D.S. Green, and S. Graham. Journal of Applied Physics (106) 114509. 2009.

2008

Temperature and Doping Dependence of Phonon Lifetimes and Decay Pathways in GaN

T. Beechem and S. Graham. Journal of Applied Physics (103) 093507. 2008.

Micro-Raman Thermometry in the Presence of Complex Stresses in GaN Devices

T. Beechem, A. Christensen, D.S. Green, and S. Graham. Journal of Applied Physics (103) 124501. 2008.

Influence of Interfacial Mixing on Thermal Boundary Conductance Across a Cr/Si Interface

P. Hopkins, P. Norris, R. Stevens, T. Beechem, and S. Graham. Journal of Heat Transfer (130) 062402. 2008.

GaN HEMT Thermal Behavior and Implications for Reliability Testing and Analysis

D.S. Green, B. Vembu, D. Hepper, S. Gibb, D. Jin, R. Vetury, J.R. Shealy, T. Beechem, and S. Graham. Physica status solidi (c) (5) 2026. 2008.

2007

Stress Relaxation in GaN by Transfer Bonding on Si Substrates

S. C. Hsu, B. J. Pong, W. H. Lee, C. Y. Liu, T. Beechem and S. Graham. Applied Physics Letters (91) 251114. 2007.

Simultaneous Measurement of Temperature and Stress in Micro-Devices Using Micro-Raman Spectroscopy

T. Beechem, S. Graham, S. Kearney, L. Phinney, and J. Serrano. Invited Paper. Review of Scientific Instruments (78) 061301. 2007.
* Featured on Cover

Role of Interface Disorder on Thermal Boundary Conductance Using a Virtual Crystal Approach

T. Beechem, S. Graham, P. Hopkins, and P. Norris. Applied Physics Letters (90) 054104. 2007.