Systematic study of polarized electron emission from strained GaAs/GaAsP superlattice photocathodes

Maruyama, T.; Luh, D.-A.; Brachmann, A.; Clendenin, J. E.; Garwin, E. L.; Harvey, S.; Jiang, J.; Kirby, R. E.; Prescott, C. Y.; Prepost, R.; Moy, A. M.
September 2004
Applied Physics Letters;9/27/2004, Vol. 85 Issue 13, p2640
Academic Journal
Spin-polarized electron photoemission has been studied for GaAs/GaAsl-xPx strained superlattice cathodes grown by gas-source molecular beam epitaxy. The superlattice structural parameters are systematically varied to optimize the photoemission characteristics. The heavy-hole and light-hole transitions are reproducibly observed in quantum efficiency spectra, enabling direct measurement of the band energies and the energy splitting. Electron-spin polarization as high as 86% with over 1% quantum efficiency has been observed.


Related Articles

  • Li- and Er-codoped ZnO with enhanced 1.54 μm photoemission. Zhen Zhou; Komori, Toshitaka; Ayukawa, Tatsuya; Yukawa, Hiroshi; Morinaga, Masahiko; Koizumi, Atsushi; Takeda, Yoshikazu // Applied Physics Letters;8/29/2005, Vol. 87 Issue 9, p091109 

    Lithium ions were introduced into Er-doped ZnO specimens, and the codoping effect was investigated on the photoluminescence (PL) spectra around 1.54 μm. It was found that the Li addition increased the PL intensity by about 90 times at most, and also the strongest peak position shifted from...

  • Three-dimensional Child–Langmuir law for uniform hot electron emission. Koh, W. S.; Ang, L. K.; Kwan, T. J. T. // Physics of Plasmas;May2005, Vol. 12 Issue 5, p053107 

    This paper presents a three-dimensional (3D) model of Child–Langmuir (CL) law for uniform hot electron emission in planar and cylindrical gap, including the effects of finite emission energy. It is found that the enhancement of 3D CL law (in terms of 1D CL law) can be written in a general...

  • Electron emission properties of Spindt-type platinum field emission cathodes. Gotoh, Y.; Nagao, M.; Nozaki, D.; Utsumi, K.; Inoue, K.; Nakatani, T.; Sakashita, T.; Betsui, K.; Tsuji, H.; Ishikawa, J. // Journal of Applied Physics;2/1/2004, Vol. 95 Issue 3, p1537 

    Electron emission properties of Spindt-type platinum field emission cathodes were investigated. The current–voltage characteristics together with the current fluctuation during long term operation were evaluated in ultrahigh vacuum. The changes of the emission properties in hydrogen,...

  • Secondary electron emission yield on poled silica based thick films. Braga, D.; Poumellec, B.; Cannas, V.; Blaise, G.; Ren, Y.; Kristensen, M. // Journal of Applied Physics;7/1/2004, Vol. 96 Issue 1, p885 

    Studies on the distribution of the electric field produced by a thermal poling process in a layer of Ge-doped silica on silicon substrate, by using secondary electron emission yield (SEEY) measurements (δ) are presented. Comparing δ0 between poled and unpoled areas, the SEEY at the origin...

  • A porous silicon diode as a source of low-energy free electrons at milli-Kelvin temperatures. Pilla, S.; Naberhuis, B.; Goodkind, J. // Journal of Applied Physics;7/15/2005, Vol. 98 Issue 2, p024508 

    We have developed a porous silicon (PS) diode that yields free-electron currents with energies <0.1 eV below 77 K. The power dissipated during emission is low so that pulses of electrons can be produced below 100 mK without raising the temperature of the system. Free electrons were generated in...

  • Site specific Eu3+ stimulated emission in GaN host. Park, J. H.; Steckl, A. J. // Applied Physics Letters;1/2/2006, Vol. 88 Issue 1, p011111 

    We report the observation of site-specific Eu3+ stimulated emission in GaN:Eu laser structures. Two main Eu sites have been identified from emission peaks associated with the 5D0→7F2 transition during above band gap optical pumping with a pulsed N2 laser (337 nm): (a) Eux emitting at...

  • Screened field enhancement factor for a tall closely spaced array of identical conducting posts and implications for Fowler-Nordheim-type equations. Forbes, Richard G. // Journal of Applied Physics;May2012, Vol. 111 Issue 9, p096102 

    For a floating-sphere model of an array of identical cylindrical posts, Zhbanov et al. [J. Appl. Phys. 110, 114311 (2011)] derive a limiting formula (as post height increases) for the screened field enhancement factor. An alternative derivation is given here for a simpler variant of this...

  • Correlation between interface energetics and open circuit voltage in organic photovoltaic cells. Wilke, A.; Endres, J.; Hörmann, U.; Niederhausen, J.; Schlesinger, R.; Frisch, J.; Amsalem, P.; Wagner, J.; Gruber, M.; Opitz, A.; Vollmer, A.; Brütting, W.; Kahn, A.; Koch, N. // Applied Physics Letters;12/3/2012, Vol. 101 Issue 23, p233301 

    We have used ultraviolet and inverse photoemission spectroscopy to determine the transport gaps (Et) of C60 and diindenoperylene (DIP), and the photovoltaic gap (EPVG) of five prototypical donor/acceptor interfaces used in organic photovoltaic cells (OPVCs). The transport gap of C60 (2.5 ±...

  • Secondary Electron Emission as a Measure of Sample Degradation Irradiated with Electrons and UV. Miyake, Hiroaki; Nitta, Kumi; Michizono, Shinichiro; Saito, Yoshio // AIP Conference Proceedings;1/5/2009, Vol. 1087 Issue 1, p645 

    We studied measurement of secondary electron emission (SEE) of metal and insulating materials used for satellite thermal insulation or other such purposes. The SEE yield measurement is very important for analyzing charge accumulation on satellite surfaces for a space environment because electron...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics