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31 Mar 2003

Volume 82, Issue 13, pp. 1999-2184

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Appl. Phys. Lett. 82, 2094 (2003); http://dx.doi.org/10.1063/1.1563813 (3 pages)

Y. J. Lee, J. von Boehm, M. Pesola, and R. M. Nieminen
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Temperature- and injection-dependent lifetime spectroscopy for the characterization of defect centers in semiconductors

Jan Schmidt

Appl. Phys. Lett. 82, 2178 (2003); http://dx.doi.org/10.1063/1.1563830 (3 pages) | Cited 25 times

Online Publication Date: 25 March 2003

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A highly sensitive, contactless defect characterization technique, temperature- and injection-dependent lifetime spectroscopy (TIDLS), is introduced. In this method, the injection-level-dependent carrier lifetime curves of a semiconductor are measured at various temperatures by means of an inductively coupled resonant circuit. In order to illustrate certain features of the TIDLS, the lifetime-limiting defect center in aluminum-doped Czochralski silicon is analyzed. It is shown that, compared to previous lifetime spectroscopy techniques, TIDLS not only determines the defect energy level with improved accuracy, but is also capable of determining the temperature dependence of the electron and hole capture cross sections. In addition, the method permits the separation between shallow and deep-level centers. © 2003 American Institute of Physics.
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71.55.Cn Elemental semiconductors
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
72.80.Cw Elemental semiconductors

Layer-guided shear acoustic plate mode sensor

M. I. Newton, G. McHale, and F. Martin

Appl. Phys. Lett. 82, 2181 (2003); http://dx.doi.org/10.1063/1.1563832 (3 pages) | Cited 2 times

Online Publication Date: 25 March 2003

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Experimental data are presented for an acoustic wave sensor based on a layer-guided shear acoustic plate mode excited on a thin quartz substrate. The effect of coating the front and back faces with polymer waveguiding layers is shown to convert the plate modes into layer-guided plate modes in a manner analogous to Love waves and to produce a similar enhancement of mass sensitivity. These layer-guided plate mode devices offer the possibility of liquid-phase sensing with transducers situated on the face of the substrate isolated from the liquid, while offering a mass sensitivity comparable to a Love wave device. © 2003 American Institute of Physics.
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43.20.Mv Waveguides, wave propagation in tubes and ducts
43.38.-p Transduction; acoustical devices for the generation and reproduction of sound
43.58.-e Acoustical measurements and instrumentation
62.30.+d Mechanical and elastic waves; vibrations
68.60.Bs Mechanical and acoustical properties
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