Sam Crawford

Massachusetts Institute of Technology

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Silvija Gradečak

National University of Singapore

Sung Keun Lim

Jeonnam Bioindustry Foundation

Georg Haberfehlner

Graz University of Technology

T. Ernst

CEA Grenoble

P. Bleuet

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

G. Audoit

CEA Grenoble

P. Bayle‐Guillemaud

Institut Nanosciences et Cryogénie

Marcus J. Smith

Wright-Patterson Air Force Base

Paul-Henry Morel

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

N. Gambacorti

CEA LETI

Cooperative Institutions

CEA Grenoble

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Institut polytechnique de Grenoble

CEA LETI

Université Grenoble Alpes

STMicroelectronics (France)

Massachusetts Institute of Technology

Centre National de la Recherche Scientifique

Institut Nanosciences et Cryogénie

Klinikum Magdeburg

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Fundamental Insights into Nanowire Diameter Modulation and the Liquid/Solid Interface

Nano Letters (2012)

Sam Crawford Sung Keun Lim Silvija Gradečak

Controlled modulation of diameter along the axis of nanowires can enhance nanowire-based device functionality, but the potential for achieving such structures with arbitrary diameter ratios has not been explored. Here, we use a theoretical approach that considers changes in the volume, wetting angle, and three-dimensional morphology of seed particles during nanowire growth to understand and guide nanowire diameter modulation. We use our experimental results from diameter-modulated InN and GaN nanowires and extend our analysis to consider the potential and limitations for diameter modulation in other materials systems. We show that significant diameter modulations can be promoted for seed materials that enable substantial compositional and surface energy changes. Furthermore, we apply our model to provide insights into the morphology of the liquid/solid interface. Our approach can be used to understand and guide nanowire diameter modulation, as well as probe fundamental phenomena during nanowire growth.

Modulation (music)

Morphology

10.1021/nl3039019

Cite

Citations (30)

Controlled Modulation of Diameter and Composition along Individual III–V Nitride Nanowires

Nano Letters (2012)

Sung Keun Lim Sam Crawford Georg Haberfehlner Silvija Gradečak

Semiconducting nanowires have unique properties that are distinct from their bulk counterparts, but realization of their full potential will be ultimately dictated by the ability to control nanowire structure, composition, and size with high accuracy. Here, we report a simple, yet versatile, approach to modulate in situ the diameter, length, and composition of individual segments within (In,Ga)N nanowires by tuning the seed particle supersaturation and size via the supply of III and V sources during the growth. By elucidating the underlying mechanisms controlling structural evolution, we demonstrate the synthesis of axial InN/InGaN nanowire heterojunctions in the nonpolar m-direction. Our approach can be applied to other materials systems and provides a foundation for future development of complex nanowire structures with enhanced functionality.

Supersaturation

Modulation (music)

10.1021/nl300121p

Cite

Citations (71)

Electron Tomography for 3D Nanoscale Characterization of Semiconductor Materials and Devices

Microscopy and Microanalysis (2013)

Georg Haberfehlner P. Bayle‐Guillemaud G. Audoit Marcus J. Smith Sam Crawford

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Characterization

10.1017/s143192761300487x

Cite

Citations (0)