Shawn Sallis
Binghamton University
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Publication
Featured researches published by Shawn Sallis.
Advanced Materials | 2015
Kelvin H. L. Zhang; Yingge Du; Alexandra Papadogianni; Oliver Bierwagen; Shawn Sallis; L. F. J. Piper; Mark E. Bowden; V. Shutthanandan; Peter V. Sushko; Scott A. Chambers
Epitaxial La1-x Srx CrO3 deposited on SrTiO3 (001) is shown to be a p-type transparent conducting oxide with competitive figures of merit and a cubic perovskite structure, facilitating integration into oxide electronics. Holes in the Cr 3d t2g bands play a critical role in enhancing p-type conductivity, while transparency to visible light is maintained because low-lying d-d transitions arising from hole doping are dipole forbidden.
Nano Letters | 2013
Nicholas F. Quackenbush; J. W. Tashman; Julia A. Mundy; Shawn Sallis; Hanjong Paik; Rajiv Misra; Jarrett A. Moyer; Jinghua Guo; Daniel Fischer; J. C. Woicik; David A. Muller; Darrell G. Schlom; L. F. J. Piper
We have combined hard X-ray photoelectron spectroscopy with angular dependent O K-edge and V L-edge X-ray absorption spectroscopy to study the electronic structure of metallic and insulating end point phases in 4.1 nm thick (14 units cells along the c-axis of VO2) films on TiO2(001) substrates, each displaying an abrupt MIT centered at ~300 K with width <20 K and a resistance change of ΔR/R > 10(3). The dimensions, quality of the films, and stoichiometry were confirmed by a combination of scanning transmission electron microscopy with electron energy loss spectroscopy, X-ray spectroscopy, and resistivity measurements. The measured end point phases agree with their bulk counterparts. This clearly shows that, apart from the strain induced change in transition temperature, the underlying mechanism of the MIT for technologically relevant dimensions must be the same as the bulk for this orientation.
Physical Review Letters | 2016
Zachary W. Lebens-Higgins; David O. Scanlon; Hanjong Paik; Shawn Sallis; Yuefeng Nie; M. Uchida; Nicholas F. Quackenbush; Matthew J. Wahila; George E. Sterbinsky; D. A. Arena; J. C. Woicik; Darrell G. Schlom; L. F. J. Piper
We have directly measured the band gap renormalization associated with the Moss-Burstein shift in the perovskite transparent conducting oxide (TCO), La-doped BaSnO_{3}, using hard x-ray photoelectron spectroscopy. We determine that the band gap renormalization is almost entirely associated with the evolution of the conduction band. Our experimental results are supported by hybrid density functional theory supercell calculations. We determine that unlike conventional TCOs where interactions with the dopant orbitals are important, the band gap renormalization in La-BaSnO_{3} is driven purely by electrostatic interactions.
Applied Physics Letters | 2013
Shawn Sallis; David O. Scanlon; S. C. Chae; Nicholas F. Quackenbush; Daniel Fischer; J. C. Woicik; Jinghua Guo; Sang-Wook Cheong; L. F. J. Piper
We report direct evidence of conduction band filling in 3% La-doped BaSnO3 using hard x-ray photoelectron spectroscopy. Direct comparisons with hybrid density functional theory calculations support a 3.2 eV indirect band gap. The use of hybrid DFT is verified by excellent agreement between our photoelectron spectra and O K-edge x-ray emission and absorption spectra. Our experimental and computational results demonstrate that the conduction band is primarily of Sn 5s orbital character with little O 2p contribution, which is a prerequisite for designing a perovskite-based transparent conducting oxide.
Applied Physics Letters | 2014
Shawn Sallis; Keith T. Butler; Nicholas F. Quackenbush; Deborah S. Williams; M. Junda; Daniel A. Fischer; J. C. Woicik; Nikolas J. Podraza; Bruce White; Aron Walsh; L. F. J. Piper
The origin of the deep subgap states in amorphous indium gallium zinc oxide (a-IGZO), whether intrinsic to the amorphous structure or not, has serious implications for the development of p-type transparent amorphous oxide semiconductors. We report that the deep subgap feature in a-IGZO originates from local variations in the oxygen coordination and not from oxygen vacancies. This is shown by the positive correlation between oxygen composition and subgap intensity as observed with X-ray photoelectron spectroscopy. We also demonstrate that the subgap feature is not intrinsic to the amorphous phase because the deep subgap feature can be removed by low-temperature annealing in a reducing environment. Atomistic calculations of a-IGZO reveal that the subgap state originates from certain oxygen environments associated with the disorder. Specifically, the subgap states originate from oxygen environments with a lower coordination number and/or a larger metal-oxygen separation.
Physical Review B | 2015
Kelvin H. L. Zhang; Yingge Du; Peter V. Sushko; Mark E. Bowden; V. Shutthanandan; Shawn Sallis; L. F. J. Piper; Scott A. Chambers
We have investigated the evolution of the electronic properties of
Applied Physics Letters | 2014
Mohana K. Rajpalke; W. M. Linhart; K. M. Yu; Michael Alexander Birkett; J. Alaria; John James Bomphrey; Shawn Sallis; L. F. J. Piper; Tim Jones; M. J. Ashwin; T. D. Veal
\mathrm{L}{\mathrm{a}}_{1\ensuremath{-}x}\mathrm{S}{\mathrm{r}}_{x}\mathrm{Cr}{\mathrm{O}}_{3}\phantom{\rule{0.16em}{0ex}}(0\ensuremath{\le}x\ensuremath{\le}1)
Review of Scientific Instruments | 2017
Ruimin Qiao; Qinghao Li; Zengqing Zhuo; Shawn Sallis; O. Fuchs; M. Blum; L. Weinhardt; C. Heske; John Pepper; Michael S. Jones; Adam Brown; Adrian Spucces; Ken Chow; Brian Smith; Per-Anders Glans; Yanxue Chen; Shishen Yan; Feng Pan; L. F. J. Piper; Jonathan D. Denlinger; Jinghua Guo; Z. Hussain; Yi-De Chuang; Wanli Yang
epitaxial films deposited by molecular beam epitaxy (MBE) using x-ray diffraction, x-ray photoemission spectroscopy, Rutherford backscattering spectrometry, x-ray absorption spectroscopy, electrical transport, and ab initio modeling.
Applied Physics Letters | 2016
Shawn Sallis; Nathalie Pereira; Pinaki Mukherjee; Nicholas F. Quackenbush; Nicholas V. Faenza; Christoph Schlueter; Tien-Lin Lee; Wanli Yang; F. Cosandey; Glenn G. Amatucci; L. F. J. Piper
\mathrm{LaCr}{\mathrm{O}}_{3}
Applied Physics Letters | 2014
Linda Wangoh; Peter M. Marley; Nicholas F. Quackenbush; Shawn Sallis; Daniel Fischer; J. C. Woicik; Sarbajit Banerjee; L. F. J. Piper
is an antiferromagnetic insulator, whereas