Photoreflectance and contactless electroreflectance measurements of semiconductor structures by using bright and dark configurations

Kudrawiec, R.; Misiewicz, J.
September 2009
Review of Scientific Instruments;Sep2009, Vol. 80 Issue 9, p096103
Academic Journal
Experimental setup for measurements of photoreflectance (PR) and contactless electroreflectance (CER) spectra in bright and dark configurations is described in this work and applied to study various semiconductor structures. The innovative solution in this setup is the possibility to measure PR and CER spectra in both experimental configurations with the same halogen lamp, monochromator, detector, and only very small modification in the optical path. In this setup the measurement conditions for the two experimental configurations are very similar, and the obtained PR and CER spectra can be compared and discussed in the context of the unwanted constant photovoltaic (PV) effect, which appears in the bright configuration when the sample is illuminated by the spectrum of white light instead of the monochromatic light. It has been clearly shown that for (i) epitaxial layers, (ii) quantum wells, and (iii) quantum dots, exactly the same spectral features are observed in both configurations at room temperature. It means that from the viewpoint of the detection of optical transitions, it is not important what configuration is used since the white light-induced PV effect does not influence the energy of optical transitions in these structures.


Related Articles

  • Spectral sensitivity of p-Cu1.8S/ n --ZnS/ n-(II-VI) heterostructures. Komaschenko, V. N.; Kolezhuk, K. V.; Yaroshenko, N. V.; Sheremetova, G. I.; Bobrenko, Yu. N. // Semiconductors;Mar2006, Vol. 40 Issue 3, p327 

    Photosensitivity of multilayered p-Cu1.8S/ n --(II-VI)/ n-(II-VI) heterostructures beyond the fundamental-absorption edge of the wide-gap component is studied experimentally, and a simple model is suggested as an explanation of this photosensitivity. It is established that an effective method...

  • Carrier dynamics in self-assembled ErAs nanoislands embedded in GaAs measured by optical-pump terahertz-probe spectroscopy. Prasankumar, R. P.; Scopatz, A.; Hilton, D. J.; Taylor, A. J.; Averitt, R. D.; Zide, J. M.; Gossard, A. C. // Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p201107 

    We use optical-pump terahertz (THz)-probe spectroscopy to study carrier dynamics in self-assembled ErAs nanoislands embedded in GaAs and deposited in a superlattice structure. Measurements are performed at several pump fluences on samples with different superlattice periods, enabling a...

  • Wavelength modulation spectroscopy using novel mechanical light chopper blade designs. Bhattacharyya, Jayeeta; Ghosh, Sandip; Arora, B. M. // Review of Scientific Instruments;Aug2005, Vol. 76 Issue 8, p083903 

    We describe two mechanical light chopper blade designs that can be used, with a monochromator and broadband light-source-based spectroscopy setup, to perform wavelength modulation spectroscopy. The left and the right half of a beam emerging from a monochromator would have spectral distributions...

  • Lab on a chip is designed for the field. Bains, Sunny // Laser Focus World;Apr2004, Vol. 40 Issue 4, p20 

    Reports that a team at the University of California-Berkeley has devised a system that can perform light-induced fluorescence spectroscopy. Complementary metal-oxide semiconductor detectors and light-emitting diodes included in the system; Design of a part that carries the chemical or...

  • Silicon radiation detectors ( Review). Akimov, Yu. // Instruments & Experimental Techniques;Jan2007, Vol. 50 Issue 1, p1 

    The modern status of the field of development of silicon detectors of charged particles and x/γ rays is considered. The types and characteristics of spectrometric detectors are briefly described; the predominant attention is given to track devices. The results of studies of the radiation...

  • Leading-order electroweak corrections to the Drell-Yan process in the CMS experiment at LHC. Zykunov, V. A. // Physics of Atomic Nuclei;Sep2010, Vol. 73 Issue 9, p1571 

    The leading part of electroweak radiative corrections to the Drell-Yan process in the CMS (compact muon solenoid detector) experiment at LHC were calculated. Analytic and numerical tests indicate that the results are independent of all nonphysical parameters. A numerical analysis of radiative...

  • Decay of 1.643 h 95Ru and its daughter's level structure. Shen Shuifa; Fang Keming; Gu Jiahui; Liu Qingcheng; Xu Furong // European Physical Journal A -- Hadrons & Nuclei;May2007, Vol. 32 Issue 2, p149 

    The decay of 95Ru has been investigated by means of γ-ray spectroscopy. The 95Ru nuclei were produced by the reaction 92Mo( α, n) 95Ru at a beam energy of 17MeV. High-purity Ge detectors have been used singly and in coincidence to study γ-rays in the decay of 95Ru to 95Tc. 132 γ-rays...

  • Double pion photoproduction off 40Ca. Bloch, F.; Ahrens, J.; Annand, J. R. M.; Beck, R.; Fog, L. S.; Hornidge, D.; Janssen, S.; Kotulla, M.; Krusche, B.; McGeorge, J. C.; MacGregor, I. J. D.; Messchendorp, J. G.; Metag, V.; Novotny, R.; Owens, R. O.; Pfeiffer, M.; Rost, M.; Sanderson, R.; Schadmand, S.; Thomas, A. // European Physical Journal A -- Hadrons & Nuclei;May2007, Vol. 32 Issue 2, p219 

    The photoproduction of π 0 π 0 and π 0 π ± pairs off 40Ca has been investigated with the TAPS detector using the Glasgow photon tagging spectrometer at the Mainz MAMI accelerator. Data have been taken for incident photon energies in the energy range from 200-820MeV. Total...

  • Near-surface and bulk deep trap states in AlxGa1-xAs/GaAs. Halder, N.C.; Genareau, K. // Applied Physics A: Materials Science & Processing;2005, Vol. 80 Issue 1, p81 

    We have measured the field-effect deep-level transient spectra of AlxGa1-xAs/GaAs (where x = 0.385) at different reverse-bias fields to probe the near-surface deep trap and bulk deep trap states. In the temperature range 77 to 380 K and for a reverse-bias field -1 to -5 V/cm, four major deep...


Read the Article


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

Try another library?
Sign out of this library

Other Topics