Ultrathin films of highly monodispersed luminescent Si nanoparticles are directly integrated on polycrystalline Si solar cells. The authors monitor the open-circuit voltage and the short circuit current. The results demonstrate that films of 1nm blue luminescent or 2.85nm red luminescent Si nanoparticles produce large voltage enhancements with improved power performance of 60% in the UV/blue range. In the visible, the enhancements are ∼10% for the red and ∼3% for the blue particles. The results point to a significant role for charge resonant transport across the nanofilm and Schottky-like rectification at nanoparticle-metal interface.
Present red phosphor converters provide spectra dominated by sharp lines and suffer from availability and stability issues which are not ideal for color mixing in display or solid state lighting applications. We examine the use of mono dispersed 3 nm silicon nanoparticles, with inhomogeneously broadened red luminescence as an effective substitute for red phosphors. We tested a 3-phase hybrid nanophosphor consisting of ZnS:Ag, ZnS:Cu,Au,Al, and nanoparticles. Correlated color temperature is examined under UV and LED pumping in the range 254, 365-400 nm. The temperature is found reasonably flat for the longer wavelengths and drops for the shorter wavelengths while the color rendering index increases. The photo stability of the phosphors relative to the silicon nanoparticles is recorded. The variation in the temperature is analyzed in terms of the strength of inter-band-gap transition and continuum band to band transitions.
Hoang, T., Stupca, M., Mantey, K., Maximenko, Y., Elhalawany, N., Carr, C. M., Yu, H., Nayfeh, M. H., Morgan, H. (2013). Complex of heavy magnetic ions and luminescent silicon nanoparticles. Journal of Applied Physics, 114 (16), [164319]We study the optical properties of luminescent silicon nanoparticles in the presence of magnetic ions of iron or erbium under wet conditions and electric biasing. Upon the introduction of the ions under zero biasing, the brightness is enhanced with some spectral change. Under biasing including breakdown ?eld conditions, the enhancement remains stable and is maintained after recovery of the particles into nanosolid ?lms using electric spray. The ion-nanoparticle interaction is analyzed using ?rst principle atomistic calculations employing unrestricted Hartree-Fock density functional theory. The calculations yield con?gurations, which show strong binding and stability. The complexes promise diverse applications in magnetic/optical imaging, spatially programmable deposition, spin-based memories and transistors, infrared communications, ?ltration, as well as interplanetary and interstellar observation and modeling. VC 2013 AIP Publishing LLC.publishersversionPeer reviewe
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