Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Sameer Chhajed"'
Autor:
Jeong Min Baik, Sunyong Hwang, Sameer Chhajed, Ji Won Byon, Sang Ho Oh, Jiseong Im, Jong Kyu Kim, Seok-Jin Yoon, Hyunah Kwon, Ho Won Jang
Publikováno v:
The Analyst. 138:443-450
We present high performance gas sensors based on an array of near single crystalline TiO(2) nanohelices fabricated by rotating oblique angle deposition (OAD). The combination of large surface-to-volume ratio, extremely small size (30 nm) comparable t
Publikováno v:
physica status solidi c. 9:851-854
The evolution of the dominant carrier transport mechanism of Alx Ga1-xN/GaN Schottky barrier diodes with increasing Al mole fraction x (x = 0.2, 0.3, 0.4, and 0.5) is investigated. The Schottky barrier height (SBH) linearly increases with the work fu
Autor:
Mary H. Crawford, Daniel D. Koleske, E. Fred Schubert, Sameer Chhajed, Jong Kyu Kim, Jaehee Cho
Publikováno v:
physica status solidi (a). 208:947-950
We have experimentally investigated the temperature dependence of optical-output power of light-emitting diodes (LEDs) with different threading dislocation densities (TDDs) to assess the influence of the TDD on the temperature stability of LEDs. Wher
Autor:
Shuai Wu, Sameer Chhajed, Wenhong Sun, Li Yan, Vinod Adivarahan, M. Asif Khan, Maxim S. Shatalov
Publikováno v:
Japanese Journal of Applied Physics. 45:L352-L354
We report the fabrication and characterization of a 10×10 matrix addressable micro-pixel AlGaN-based deep UV light-emitting diodes (LEDs) with emission at 280 nm. Deep reactive ion etching and benzocyclobutene dielectric deposition were used for pix
Autor:
E. Fred Schubert, Jaehee Cho, Sameer Chhajed, David J. Poxson, Seung Jae Oh, Sung Ju Tark, Donghwan Kim, Jong Kyu Kim
Publikováno v:
Optics express. 21
The performance enhancement of polycrystalline Si solar cells by using an optimized discrete multilayer anti-reflection (AR) coating with broadband and omni-directional characteristics is presented. Discrete multilayer AR coatings are optimized by a
Autor:
Sameer Chhajed, Frank W. Mont, David J. Poxson, Roger E. Welser, Ashok K. Sood, E. Fred Schubert, Jaehee Cho, Adam W. Sood, Nibir K. Dhar
Publikováno v:
Journal of nanoscience and nanotechnology. 12(5)
Oblique-angle deposition of indium tin oxide (ITO) is used to fabricate optical thin-film coatings with a porous, columnar nanostructure. Indium tin oxide is a material that is widely used in industrial applications because it is both optically trans
Autor:
Sang Ho Oh, Seok-Jin Yoon, Sameer Chhajed, Ji Won Byon, Jiseong Im, Hyunah Kwon, Jong Kyu Kim, Sun-Yong Hwang, Ho Won Jang, Jeong Min Baik
Publikováno v:
Proceedings IMCS 2012.
We present TiO2 nanohelix gas sensors with top-and-bottom electrodes configuration fabricated by oblique angle deposition (OAD) that is very simple, easy, and compatible with conventional microfabrication processes. The combination of large surface-t
Autor:
David J. Poxson, Ashok K. Sood, Jaehee Cho, Nibir K. Dhar, Adam W. Sood, E. Fred Schubert, Sameer Chhajed, Roger E. Welser, Dennis L. Polla
Publikováno v:
Energy Harvesting and Storage: Materials, Devices, and Applications II.
Ultra-high, broadband transmittance through coated glass windows is demonstrated over a wide range of incident angles. Near perfect 100% transmittance through a glass substrate has been achieved over select spectral bands, and the average transmittan
Autor:
E. Fred Schubert, Roya Mirhosseini, Jong Kyu Kim, Sameer Chhajed, Martin F. Schubert, Jaehee Cho
Publikováno v:
SPIE Proceedings.
There exists a fundamental trade-off relation between color rendering index (CRI) and luminous efficacy; in other words, improvements in one are generally detrimental to the other. We analyze and demonstrate through simulation that phosphor-converted
Conductive distributed Bragg reflector fabricated by oblique angle deposition from a single material
Publikováno v:
SPIE Proceedings.
Oblique angle deposition allows the fabrication of nano-structured porous thin films of high optical quality. By selecting the incident angle, the porosity - and thereby, the refractive index - of the deposited film can be tuned to a specific desired