183 citations · 911 across the 21 of their papers we have counts for
21 papers
High thermal conductivity of rutile-GeO films grown by MOCVD:
Imteaz Rahaman, Michael E. Liao, Ziqi Wang +10
Rutile germanium dioxide (r-GeO2) has recently emerged as a promising ultrawide-bandgap (UWBG) semiconductor owing to its wide bandgap (~4.4-5.1 eV), ambipolar doping potential, an…
Experimental observation of ballistic to diffusive transition in AlN thin films
Md Shafkat Bin Hoque, Michael E. Liao, Saman Zare +10
Bulk AlN possesses high thermal conductivity due to long phonon mean-free-paths, high group velocity, and long lifetimes. However, the thermal transport scenario becomes very diffe…
18 GHz Solidly Mounted Resonator in Scandium Aluminum Nitride on SiO2/Ta2O5 Bragg Reflector
Omar Barrera, Nishanth Ravi, Kapil Saha +12
This work reports an acoustic solidly mounted resonator (SMR) at 18.64 GHz, among the highest operating frequencies reported. The device is built in scandium aluminum nitride (ScAl…
Imaging Hot Photocarrier Transfer across a Semiconductor Heterojunction with Ultrafast Electron Microscopy
Basamat S. Shaheen, Kenny Huynh, Yujie Quan +5
Semiconductor heterojunctions have gained significant attention for efficient optoelectronic devices owing to their unique interfaces and synergistic effects. Interaction between c…
Unraveling the nature of quasi van der Waals Epitaxy of magnetic topological insulators Cr: (BixSb1-x)2Te3 on a GaAs (111) substrate through coherently strained interface
Yuxing Ren, Lixuan Tai, Kaicheng Pan +14
Quasi van der Waals Epitaxy (qvdWE) has been realized for decades at the interfaces between 3D and 2D materials or van der Waals materials. The growth of magnetic topological insul…
Transferred Thin Film Lithium Niobate as Millimeter Wave Acoustic Filter Platforms
Omar Barrera, Sinwoo Cho, Kenny Hyunh +6
This paper reports the first high-performance acoustic filters toward millimeter wave (mmWave) bands using transferred single-crystal thin film lithium niobate (LiNbO3). By transfe…
Thin-Film Lithium Niobate Acoustic Resonator with High Q of 237 and k2 of 5.1% at 50.74 GHz
Jack Kramer, Vakhtang Chulukhadze, Kenny Huynh +6
This work reports a 50.74 GHz lithium niobate (LiNbO3) acoustic resonator with a high quality factor (Q) of 237 and an electromechanical coupling (k2) of 5.17% resulting in a figur…
Thin-Film Lithium Niobate Acoustic Filter at 23.5 GHz with 2.38 dB IL and 18.2% FBW
Omar Barrera, Sinwoo Cho, Lezli Matto +6
This work reports an acoustic filter at 23.5 GHz with a low insertion loss (IL) of 2.38 dB and a 3-dB fractional bandwidth (FBW) of 18.2%, significantly surpassing the state-of-the…
Defects Evolution and Mg Segregation in Mg-implanted GaN with Ultra-High-Pressure Annealing
Y. Wang, K. Huynh, M. E. Liao +9
Annealing Mg-implanted homoepitaxial GaN at temperatures at or above 1400 °C eliminates the formation of inversion domains and leads to improved dopant activation efficiency. Exten…
Experimental Observation of Localized Interfacial Phonon Modes
Zhe Cheng, Ruiyang Li, Xingxu Yan +12
Interfaces impede heat flow in micro/nanostructured systems. Conventional theories for interfacial thermal transport were derived based on bulk phonon properties of the materials m…
Approaching the Practical Conductivity Limits of Aerosol Jet Printed Silver
Eva S. Rosker, Michael T. Barako, Evan Nguyen +6
Previous efforts to directly write conductive metals have been narrowly focused on nanoparticle ink suspensions that require aggressive sintering (>200 °C) and result in low-densit…
Simultaneous Evaluation of Heat Capacity and In-plane Thermal Conductivity of Nanocrystalline Diamond Thin Films
Luke Yates, Zhe Cheng, Tingyu Bai +6
As wide bandgap electronic devices have continued to advance in both size reduction and power handling capabilities, heat dissipation has become a significant concern. To mitigate…
A Refined Model for Epitaxial Tilt of Epilayers Grown on Miscut Substrates
Michael E. Liao, Mark S. Goorsky
A refined model of the origin of epitaxial tilt on miscut (or vicinal) substrates is explained by employing crystal modeling and reciprocal space analysis. The Nagai tilt model (H.…
Experimental Observation of High Intrinsic Thermal Conductivity of AlN
Zhe Cheng, Yee Rui Koh, Abdullah Mamun +17
AlN is an ultra-wide bandgap semiconductor which has been developed for applications including power electronics and optoelectronics. Thermal management of these applications is th…
Molecular Beam Epitaxy Growth of High Crystalline Quality LiNbO
M. Brooks Tellekamp, Joshua C. Shank, Mark S. Goorsky +1
Lithium niobate is a multi-functional material with wide reaching applications in acoustics, optics, and electronics. Commercial applications for lithium niobate require high cryst…
Integration of Atomic Layer Epitaxy Crystalline Ga2O3 on Diamond for Thermal Management
Zhe Cheng, Virginia D. Wheeler, Tingyu Bai +6
Ga2O3 has attracted great attention for electronic device applications due to its ultra-wide bandgap, high breakdown electric field, and large-area affordable substrates grown from…
Thermal Conductance Across Harmonic-matched Epitaxial Al-sapphire Heterointerfaces
Zhe Cheng, Yee Rui Koh, Habib Ahmad +17
A unified understanding of interfacial thermal transport is missing due to the complicated nature of interfaces which involves complex factors such as interfacial bonding, interfac…
Tunable Thermal Energy Transport across Diamond Membranes and Diamond-Si Interfaces by Nanoscale Graphoepitaxy
Zhe Cheng, Tingyu Bai, Jingjing Shi +14
The development of electronic devices, especially those that involve heterogeneous integration of materials, has led to increased challenges in addressing their thermal operational…
Direct Visualization of Thermal Conductivity Suppression Due to Enhanced Phonon Scattering Near Individual Grain Boundaries
Aditya Sood, Ramez Cheaito, Tingyu Bai +9
Understanding the impact of lattice imperfections on nanoscale thermal transport is crucial for diverse applications ranging from thermal management to energy conversion. Grain bou…
Thermal boundary conductance across epitaxial ZnO/GaN interfaces: Assessment of phonon gas models and atomistic Green's function approaches for predicting interfacial phonon transport
John T. Gaskins, George Kotsonis, Ashutosh Giri +13
We present experimental measurements of the thermal boundary conductance (TBC) from K across isolated heteroepitaxially grown ZnO films on GaN substrates. These data pro…
Probing Growth-Induced Anisotropic Thermal Transport in CVD Diamond Membranes by Multi-frequency and Multi-spot-size Time-Domain Thermoreflectance
Zhe Cheng, Thomas Bougher, Tingyu Bai +7
The maximum output power of GaN-based high-electron mobility transistors is limited by high channel temperature induced by localized self-heating which degrades device performance…