The time dynamics of self-pumped reflection gratings in a commonly used photorefractive polymer PDCST:PVK:ECZ-BBP:C60 with no additional electron sources or traps is investigated. While holes are normally the mobile charges and responsible for grating formation, our experimental observations, analyzed using multi-exponential fitting curves, show evidence of electrons in addition to holes as charge carriers, particularly above an applied field of 40 V/μm. The dependence of effective carrier mobilities on the applied electric field, deduced from experimental results, show stronger field dependence of electron mobility at high electric fields. At an applied field of 70 V/μm, electron and hole mobilities become approximately equal, and the contribution of electrons on grating formation becomes significant.
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1 January 2012
Research Article|
January 12 2012
Time dynamics of self-pumped reflection gratings in a photorefractive polymer
P. P. Banerjee;
P. P. Banerjee
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, USA
2
University of Dayton
, Department of ECE and Electro-Optics Program, Dayton, Ohio 45469, USA
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S. H. Buller;
S. H. Buller
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, USA
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C. M. Liebig;
C. M. Liebig
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, USA
3
Azimuth Corporation
, 4134 Linden Avenue, Suite 300, Dayton, Ohio 45432, USA
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S. A. Basun;
S. A. Basun
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, USA
3
Azimuth Corporation
, 4134 Linden Avenue, Suite 300, Dayton, Ohio 45432, USA
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G. Cook;
G. Cook
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, USA
3
Azimuth Corporation
, 4134 Linden Avenue, Suite 300, Dayton, Ohio 45432, USA
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D. R. Evans;
D. R. Evans
a)
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, USA
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P.-A. Blanche;
P.-A. Blanche
4College of Optical Sciences,
University of Arizona
, Tucson, Arizona 85721, USA
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J. Thomas;
J. Thomas
4College of Optical Sciences,
University of Arizona
, Tucson, Arizona 85721, USA
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C. W. Christenson;
C. W. Christenson
4College of Optical Sciences,
University of Arizona
, Tucson, Arizona 85721, USA
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N. Peyghambarian
N. Peyghambarian
4College of Optical Sciences,
University of Arizona
, Tucson, Arizona 85721, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: dean.evans@wpafb.af.mil.
J. Appl. Phys. 111, 013108 (2012)
Article history
Received:
August 25 2011
Accepted:
November 29 2011
Citation
P. P. Banerjee, S. H. Buller, C. M. Liebig, S. A. Basun, G. Cook, D. R. Evans, P.-A. Blanche, J. Thomas, C. W. Christenson, N. Peyghambarian; Time dynamics of self-pumped reflection gratings in a photorefractive polymer. J. Appl. Phys. 1 January 2012; 111 (1): 013108. https://doi.org/10.1063/1.3672832
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