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29 Oct 2012

Volume 101, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 101, 183101 (2012); http://dx.doi.org/10.1063/1.4761935 (4 pages)

S. J. Kim, J. J. Lee, H. J. Kang, J. B. Choi, Y.-S. Yu, Y. Takahashi, and D. G. Hasko
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Direct visualization of Ni-Nb bulk metallic glasses surface: From initial nucleation to full crystallization

A. I. Oreshkin, V. N. Mantsevich, S. V. Savinov, S. I. Oreshkin, V. I. Panov, N. S. Maslova, and D. V. Louzguine-Luzgin

Appl. Phys. Lett. 101, 181601 (2012); http://dx.doi.org/10.1063/1.4760272 (4 pages)

Online Publication Date: 29 October 2012

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This article is devoted to in situ investigation of the Ni-based bulk metallic glass structural evolution and crystallization behavior by scanning tunneling microscopy/spectroscopy. The possibility of different surface nanostructures formation is shown by annealing of an original bulk glassy alloy in ultra high vacuum. Atomic locations in these surface nanostructures are completely different from those formed according to Ni-Nb binary phase diagram in the bulk area of the sample. The validity of the results is also verified by transmission electron microscopy and nano-beam diffraction measurements.
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64.70.pe Metallic glasses
81.40.Gh Other heat and thermomechanical treatments
81.16.-c Methods of micro- and nanofabrication and processing
61.46.-w Structure of nanoscale materials
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
61.43.Fs Glasses

Phase constitution and interface structure of nano-sized Ag-Cu/AlN multilayers: Experiment and ab initio modeling

Giancarlo Pigozzi, Andrej Antušek, Jolanta Janczak-Rusch, Magdalena Parlinska-Wojtan, Daniele Passerone, Carlo Antonio Pignedoli, Vinzenz Bissig, Jörg Patscheider, and Lars P. H. Jeurgens

Appl. Phys. Lett. 101, 181602 (2012); http://dx.doi.org/10.1063/1.4761471 (5 pages)

Online Publication Date: 1 November 2012

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Nano-sized Ag-Cu8nm/AlN10nm multilayers were deposited by reactive DC sputtering on α-Al2O3(0001) substrates. Investigation of the phase constitution and interface structure of the multilayers evidences a phase separation of the alloy sublayers into nanosized grains of Ag and Cu. The interfaces between the Ag grains and the quasi-single-crystalline AlN sublayers are semi-coherent, whereas the corresponding Cu/AlN interfaces are incoherent. The orientation relationship between Ag and AlN is constant throughout the entire multilayer stack. These observations are consistent with atomistic models of the interfaces as obtained by ab initio calculations.
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81.07.Bc Nanocrystalline materials
64.75.Jk Phase separation and segregation in nanoscale systems
68.35.Ct Interface structure and roughness
81.15.Cd Deposition by sputtering

Exploring the p-n junction region in Cu(In,Ga)Se2 thin-film solar cells at the nanometer-scale

O. Cojocaru-Mirédin, P. Choi, R. Wuerz, and D. Raabe

Appl. Phys. Lett. 101, 181603 (2012); http://dx.doi.org/10.1063/1.4764527 (5 pages) | Cited 1 time

Online Publication Date: 2 November 2012

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In this work we study the CdS/Cu(In,Ga)Se2 p-n junction region in Cu(In,Ga)Se2 thin-film solar cells using atom probe tomography. A Cu-, Ga-depleted, and Cd-doped region of about 1 nm thickness is detected at the Cu(In,Ga)Se2 side of the CdS/Cu(In,Ga)Se2 interface. Furthermore, Cd is also found to be enriched at Cu(In,Ga)Se2 grain boundaries connected to the CdS layer. Na and O impurities decorate the CdS/CIGS interface, where Na-rich clusters are preferentially located in CdS regions abutting to Cu(In,Ga)Se2 grain boundaries. The experimental findings of this work demonstrate the capability of atom probe tomography in studying buried interfaces and yield vital information for understanding and modeling the p-n junction band structure in Cu(In,Ga)Se2 solar cells.
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73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
88.40.jp Multijunction solar cells
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