338 citations · 737 across the 11 of their papers we have counts for
11 papers
Graphene Oxide Photoreduction Recovers Graphene Hot Electron Cooling Dynamics
Alden N. Bradley, Spencer G. Thorp, Gina Mayonado +2
Reduced graphene oxide (rGO) is a bulk-processable quasi-amorphous 2D material with broad spectral coverage and fast electronic response. rGO sheets are suspended in a polymer matr…
Illuminating trap density trends in amorphous oxide semiconductors with ultrabroadband photoconduction
George W. Mattson, Kyle T. Vogt, John F. Wager +1
Under varying growth and device processing conditions, ultrabroadband photoconduction (UBPC) reveals strongly evolving trends in the defect density of states (DoS) for amorphous ox…
Hydrogen incorporation into amorphous indium gallium zinc oxide thin-film transistors
George W. Mattson, Kyle T. Vogt, John F. Wager +1
Within the subgap of amorphous oxide semiconductors like amorphous indium gallium zinc oxide (a-IGZO) are donor-like and acceptor-like states that control the operational physics o…
Ultrafast photocurrent and absorption microscopy of few-layer TMD devices isolate rate-limiting dynamics driving fast and efficient photoresponse
Kyle T. Vogt, Su-Fei Shi, Feng Wang +1
Despite inherently poor interlayer conductivity, photodetectors made from few-layer devices of 2D transition metal dichalcogenides (TMDs) such as WSe and MoS can still yiel…
Ultrabroadband Density of States of Amorphous In-Ga-Zn-O
Kyle T. Vogt, Christopher E. Malmberg, Jacob C. Buchanan +6
The sub-gap density of states of amorphous indium gallium zinc oxide (-IGZO) is obtained using the ultrabroadband photoconduction (UBPC) response of thin-film transistors (TFTs)…
θ-Tunable Photoluminescence from Interlayer Excitons in Twisted Bilayer Graphene
Hiral Patel, Lujie Huang, Cheol-Joo Kim +2
Using resonant 2-photon excitation of interlayer electrons in twisted bilayer graphene (tBLG), we resolve photoluminescence (PL) that tunes spectrally with stacking angle, θ. This…
Strongly bound excitons dominate electronic relaxation in resonantly excited twisted bilayer graphene
Hiral Patel, Lola Brown, Yufeng Liang +3
When two sheets of graphene stack in a twisted bilayer graphene (tBLG) configuration, the resulting constrained overlap between interplanar 2p orbitals produce angle-tunable electr…
New Mechanism for Strongly Bound Excitons in Gapless Two-Dimensional Structures
Yufeng Liang, Ryan Soklaski, Shouting Huang +4
Common wisdom asserts that bound excitons cannot form in high-dimensional (d>1) metallic structures because of their overwhelming screening and unavoidable resonance with nearby co…
Transient absorption and photocurrent microscopy show hot electron supercollisions describe the rate-limiting relaxation step in graphene
Matt W. Graham, Su-Fei Shi, Zenghui Wang +3
Using transient absorption (TA) microscopy as a hot electron thermometer we show disorder-assisted acoustic-phonon supercollisions (SCs) best describes the rate-limiting relaxation…
Photocurrent measurements of supercollision cooling in graphene
Matt W. Graham, Su-Fei Shi, Daniel C. Ralph +2
The cooling of hot electrons in graphene is the critical process underlying the operation of exciting new graphene-based optoelectronic and plasmonic devices, but the nature of thi…
Ultrafast Spectroscopy of Mid-Infrared Internal Exciton Transitions of Separated Single-Walled Carbon Nanotubes
Jigang Wang, Matt W. Graham, Yingzhong Ma +2
We report a femtosecond mid-infrared study of the broadband low-energy response of individually separated (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorp…