Type

Journal Article

Authors

C O'Dwyer
K M Ryan
C M Sotomayor Torres
T Kennedy
E Armstrong
Clivia M. Sotomayor Torres
W Khunsin
T. Armstrong
M Osiak
E. Khunsin

Subjects

Physics

Topics
lithium thin film surface orientation ito nanowires perfect antireflection coatings light emitting diodes electrodes silica single crystal size distribution refractive index molecular beam epitaxy three dimensional fabrication infra red

Epitaxial growth of visible to infra-red transparent conducting In(2)O(3) nanodot dispersions and reversible charge storage as a Li-ion battery anode. (2013)

Abstract Unique bimodal distributions of single crystal epitaxially grown In(2)O(3) nanodots on silicon are shown to have excellent IR transparency greater than 87% at IR wavelengths up to 4 μm without sacrificing transparency in the visible region. These broadband antireflective nanodot dispersions are grown using a two-step metal deposition and oxidation by molecular beam epitaxy, and backscattered diffraction confirms a dominant (111) surface orientation. We detail the growth of a bimodal size distribution that facilitates good surface coverage (80%) while allowing a significant reduction in In(2)O(3) refractive index. This unique dispersion offers excellent surface coverage and three-dimensional volumetric expansion compared to a thin film, and a step reduction in refractive index compared to bulk active materials or randomly porous composites, to more closely match the refractive index of an electrolyte, improving transparency. The (111) surface orientation of the nanodots, when fully ripened, allows minimum lattice mismatch strain between the In(2)O(3) and the Si surface. This helps to circumvent potential interfacial weakening caused by volume contraction due to electrochemical reduction to lithium, or expansion during lithiation. Cycling under potentiodynamic conditions shows that the transparent anode of nanodots reversibly alloys lithium with good Coulombic efficiency, buffered by co-insertion into the silicon substrate. These properties could potentially lead to further development of similarly controlled dispersions of a range of other active materials to give transparent battery electrodes or materials capable of non-destructive in situ spectroscopic characterization during charging and discharging.
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Full list of authors on original publication

C O'Dwyer, K M Ryan, C M Sotomayor Torres, T Kennedy, E Armstrong, Clivia M. Sotomayor Torres, W Khunsin, T. Armstrong, M Osiak, E. Khunsin

Experts in our system

1
Colm O'Dwyer
University College Cork
Total Publications: 121
 
2
Kevin M. Ryan
University of Limerick
Total Publications: 79
 
3
Tadhg Kennedy
University of Limerick
Total Publications: 10
 
4
Eileen Armstrong
University College Cork
Total Publications: 8
 
5
Michal J Osiak
University College Cork
Total Publications: 4