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10 papers
Optical excitation of atomic force microscopy cantilever for accurate spectroscopic measurements
Yoichi Miyahara, Harrisonn Griffin, Antoine Roy-Gobeil +4
Reliable operation of frequency modulation mode atomic force microscopy (FM-AFM) depends on a clean resonance of an AFM cantilever. It is recognized that the spurious mechanical re…
Mechanisms of Ultrafast Charge Separation in a PTB7/Monolayer MoS2 van der Waals Heterojunction
Chengmei Zhong, Vinod K. Sangwan, Chen Wang +3
Mixed-dimensional van der Waals heterojunctions comprising polymer and twodimensional (2D) semiconductors have many characteristics of an ideal charge separation interface for opto…
Charge Separation at Mixed-Dimensional Single and Multilayer MoS2/Silicon Nanowire Heterojunctions
Alex Henning, Vinod K. Sangwan, Hadallia Bergeron +4
Layered two-dimensional (2-D) semiconductors can be combined with other low-dimensional semiconductors to form non-planar mixed-dimensional van der Waals (vdW) heterojunctions whos…
Multi-Terminal Memtransistors from Polycrystalline Monolayer MoS2
Vinod K. Sangwan, Hong-Sub Lee, Hadallia Bergeron +4
In the last decade, a 2-terminal passive circuit element called a memristor has been developed for non-volatile resistive random access memory and has more recently shown promise f…
Self-Aligned van der Waals Heterojunction Diodes and Transistors
Vinod K. Sangwan, Megan E. Beck, Alex Henning +7
A general self-aligned fabrication scheme is reported here for a diverse class of electronic devices based on van der Waals materials and heterojunctions. In particular, self-align…
Valley-selective optical Stark effect probed by Kerr rotation
Trevor LaMountain, Hadallia Bergeron, Itamar Balla +3
The ability to monitor and control distinct states is at the heart of emerging quantum technologies. The valley pseudospin in transition metal dichalcogenide (TMDC) monolayers is a…
Ultrafast Exciton Dissociation and Long-Lived Charge Separation in a Photovoltaic Pentacene MoS2 van der Waals Heterojunction
Stephanie Bettis Homan, Vinod K. Sangwan, Itamar Balla +3
Van der Waals heterojunctions between two-dimensional (2D) layered materials and nanomaterials of different dimensions present unique opportunities for gate-tunable optoelectronic…
Mutual Photoluminescence Quenching and Photovoltaic Effect in Large-Area Single-Layer MoS2-Polymer Heterojunctions
Tejas A. Shastry, Itamar Balla, Hadallia Bergeron +3
Two-dimensional transition metal dichalcogenides (TMDCs) have recently attracted attention due to their superlative optical and electronic properties. In particular, their extraord…
Point Defects and Grain Boundaries in Rotationally Commensurate MoS2 on Epitaxial Graphene
Xiaolong Liu, Itamar Balla, Hadallia Bergeron +1
With reduced degrees of freedom, structural defects are expected to play a greater role in two-dimensional materials in comparison to their bulk counterparts. In particular, mechan…
Rotationally Commensurate Growth of MoS2 on Epitaxial Graphene
Xiaolong Liu, Itamar Balla, Hadallia Bergeron +3
Atomically thin MoS2/graphene heterostructures are promising candidates for nanoelectronic and optoelectronic technologies. Among different graphene substrates, epitaxial graphene…