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Liquid-like Free Carrier Solvation and Band Edge Luminescence in Lead-Halide Perovskites
Yinsheng Guo, Omer Yaffe, Trevor D. Hull +3
We report a strongly temperature dependent luminescence Stokes shift in the electronic spectra of both hybrid and inorganic lead-bromide perovskite single crystals. This behavior s…
Interplay between organic cations and inorganic framework and incommensurability in hybrid lead-halide perovskite CH3NH3PbBr3
Yinsheng Guo, Omer Yaffe, Daniel W. Paley +6
Organic-inorganic coupling in the hybrid lead-halide perovskite is a central issue in rationalizing the outstanding photovoltaic performance of these emerging materials. Here we co…
Local polar fluctuations in lead halide perovskite crystals
Omer Yaffe, Yinsheng Guo, Liang Z. Tan +11
Hybrid lead-halide perovskites have emerged as an excellent class of photovoltaic materials. Recent reports suggest that the organic molecular cation is responsible for local polar…
Raman Spectroscopy of Lithographically Patterned Graphene Nanoribbons
Sunmin Ryu, Janina Maultzsch, Melinda Y. Han +2
Nanometer-scale graphene objects are attracting much research interest because of newly emerging properties originating from quantum confinement effects. We present Raman spectrosc…
Atmospheric Oxygen Binding and Hole Doping in Deformed Graphene on a SiO2 Substrate
Sunmin Ryu, Li Liu, Stephane Berciaud +5
Using micro-Raman spectroscopy and scanning tunneling microscopy, we study the relationship between structural distortion and electrical hole doping of graphene on a silicon dioxid…
Imaging Stacking Order in Few-Layer Graphene
Chun Hung Lui, Zhiqiang Li, Zheyuan Chen +3
Few-layer graphene (FLG) has been predicted to exist in various crystallographic stacking sequences, which can strongly influence the electronic properties of FLG. We demonstrate a…