Showing papers by "Joshua E. Goldberger published in 2015"
TL;DR: This Account summarizes recent work on a new family of two-dimensional materials based on sp(3)-hybridized group IV elements that are promising building blocks for a variety of conventional semiconductor applications but also provide a pioneering platform to systematically and rationally control material properties using covalent chemistry.
Abstract: ConspectusThe isolation of graphene has sparked a renaissance in the study of two-dimensional materials. This led to the discovery of new and unique phenomena such as extremely high carrier mobility, thermal conductivity, and mechanical strength not observed in the parent 3D structure. While the emergence of these phenomena has spurred widespread interest in graphene, the paradox between the high-mobility Fermi–Dirac electronic structure and the need for a sizable band gap has challenged its application in traditional semiconductor devices. While graphene is a fascinating and promising material, the limitation of its electronic structure has inspired researchers to explore other 2D materials beyond graphene.In this Account, we summarize our recent work on a new family of two-dimensional materials based on sp3-hybridized group IV elements. Ligand-terminated Si, Ge, and Sn graphane analogues are an emerging and unique class of two-dimensional materials that offer the potential to tailor the structure, stabi...
91 citations
06 Aug 2015
TL;DR: In this article, the synthesis and transfer of epitaxial germanane (GeH) onto arbitrary substrates by electrochemical delamination and investigate its optoelectronic properties is reported.
Abstract: We report the synthesis and transfer of epitaxial germanane (GeH) onto arbitrary substrates by electrochemical delamination and investigate its optoelectronic properties. GeH films with thickness ranging from 1 to 600 nm (2–1000 layers) and areas up to ~1 cm2 have been reliably transferred and characterized by photoluminescence, x-ray diffraction, and energy-dispersive x-ray spectroscopy. Wavelength dependent photoconductivity measurements on few-layer GeH exhibit an absorption edge and provide a sensitive characterization tool for ultrathin germanane materials. The transfer process also enables the possibility of integrating germanane into vertically stacked heterostructures.
47 citations
TL;DR: There has been an expanding library of materials in which the framework connectivity of prevalent solid-state crystal structure types is terminated with ligands along specific axes to produce robust, crystalline, single-and few-atom/polyhedral thick fragments as discussed by the authors.
Abstract: There has been an expanding library of materials in which the framework connectivity of prevalent solid-state crystal structure types is terminated with ligands along specific axes to produce robust, crystalline, single- and few-atom/polyhedral thick fragments. The abrupt termination of the ionic/covalent inorganic framework along a particular direction, gives these materials fundamentally different electronic, optical, thermal, and magnetic properties, which can be manipulated via the design of the organic component. These new materials often exhibit advantageous electronic and optoelectronic behavior, making them viable platforms for applications ranging from light emitting phosphors, to thin film field effect transistors, to photovoltaics. This Perspective highlights our current understanding and future opportunities in the synthesis, properties, and applications of these atomic-scale derivatives of solid-state materials.
16 citations
4 citations
TL;DR: In this paper, Alloyed Ge/Sn graphane analogues are prepared by topochemical deintercalation of CaGe2-2xSn2x (x = 0-0.09) in conc.
Abstract: Alloyed Ge/Sn graphane analogues are prepared by topochemical deintercalation of CaGe2-2xSn2x (x = 0—0.09) in conc.
4 citations
TL;DR: There has been an expanding library of materials in which the framework connectivity of prevalent solid-state crystal structure types is terminated with ligands along specific axes to produce robust, crystalline, single-and few-atom/polyhedral thick fragments.
Abstract: There has been an expanding library of materials in which the framework connectivity of prevalent solid-state crystal structure types is terminated with ligands along specific axes to produce robust, crystalline, single- and few-atom/polyhedral thick fragments. The abrupt termination of the ionic/covalent inorganic framework along a particular direction, gives these materials fundamentally different electronic, optical, thermal, and magnetic properties, which can be manipulated via the design of the organic component. These new materials often exhibit advantageous electronic and optoelectronic behavior, making them viable platforms for applications ranging from light emitting phosphors, to thin film field effect transistors, to photovoltaics. This Perspective highlights our current understanding and future opportunities in the synthesis, properties, and applications of these atomic-scale derivatives of solid-state materials.
1 citations