Simultaneous utilization of ac photoelectromotive (photo-EMF) and modulated photocarrier grating (MPG) techniques for characterization of bipolar transport in semi-insulating photorefractive GaAlAs multiple quantum well structure is reported. From the ac photo-EMF experiment the electrons were determined as the dominant photocarriers for interband optical excitation at nm. From the self-consistent data obtained from photo-EMF and MPG experiments the diffusion length of the photoelectrons was evaluated as μm, and that of the photoholes (minority carriers)—as μm. In the MPG configuration, the contrast of the illuminating interference pattern was controlled by electro-optic modulation of the signal beam polarization, which allowed us to measure dielectric relaxation time of the photoconductor as well. As evaluated by both techniques it proved to be about μs for the average light intensity The proposed combination of the characterization techniques seems to be especially promising for amorphous a–Si and polymer films.
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15 August 2002
Research Article|
August 15 2002
Characterization of photorefractive GaAlAs multiple quantum well structures by ac photoelectromotive force and modulated photocarrier grating techniques Available to Purchase
S. Stepanov;
S. Stepanov
INAOE, Apartado Postal 51 y 216, Puebla, 72000, Mexico
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I. Seres;
I. Seres
INAOE, Apartado Postal 51 y 216, Puebla, 72000, Mexico
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S. Mansurova;
S. Mansurova
CIICAp, University of Morelos, Avenida Universidad 1001, Cuernavaca, 62210, Mexico
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D. Nolte
D. Nolte
Department of Physics, Purdue University, West Lafayette, Indiana 47907-1396
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S. Stepanov
INAOE, Apartado Postal 51 y 216, Puebla, 72000, Mexico
I. Seres
INAOE, Apartado Postal 51 y 216, Puebla, 72000, Mexico
S. Mansurova
CIICAp, University of Morelos, Avenida Universidad 1001, Cuernavaca, 62210, Mexico
D. Nolte
Department of Physics, Purdue University, West Lafayette, Indiana 47907-1396
J. Appl. Phys. 92, 1825–1832 (2002)
Article history
Received:
October 16 2001
Accepted:
May 08 2002
Citation
S. Stepanov, I. Seres, S. Mansurova, D. Nolte; Characterization of photorefractive GaAlAs multiple quantum well structures by ac photoelectromotive force and modulated photocarrier grating techniques. J. Appl. Phys. 15 August 2002; 92 (4): 1825–1832. https://doi.org/10.1063/1.1490155
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