Anisotropic Properties of Black Phosphorus and Phosphorene
Proceeding the current interest in layered structure for electronic and optoelectronic applications, research in the 1960s found that black phosphorus combines high carrier mobility with a narrow bandgap. The very recent successful exfoliation of monolayer black phosphorus, also called phosphorene, and the demonstration of superior transport properties of few-layer black phosphorus have generated wide interests, because black phosphorus does bridge the gap between zero bandgap graphene and wide bandgap transition metal dichalcogenides, thereby providing a new venue to expand the range of experimentally accessible two-dimensional crystals. In the unit cell of phosphorene, each phosphorus atom covalently bonds to its three nearest neighbors, and this sp3-type bonding has introduced a distinctly anisotropic crystal structure, resulting in two principal lattice axes, named armchair and zigzag. Owing to its unusual puckered structure and coupled hinge-like bonding configuration, the anisotropic properties in black phosphorus are unique and intriguing, compared to the conventional bulk semiconductors and other two-dimensional materials like graphene and molybdenum disulfide. In the scope of this dissertation, device perspectives for black phosphorus transistors in terms of contact resistance, channel length scaling, and chemical doping had been firstly established. In addition, weak localization and universal conductance fluctuation effects had also been studied at cryogenic temperatures. Moreover, the dissertation plans to address the substantial anisotropic properties of this novel nanomaterial, including electrical, optical, mechanical behaviors, and their relations.
Ye, Purdue University.
Electrical engineering|Condensed matter physics|Nanotechnology
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