Interplay of device structure and intrinsic polymer photophysics and its effects on the ITO/PEDOT:PSS/MEH-PPV/Al photocurrent spectra

Petrović, Jovana P.; Matavulj, Petar S.; Pinto, Leon R.; Živanović, Sandra R.

doi:doi:10.1117/1.3594090

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Journal of Nanophotonics / Volume 5 / Special Section: Selected Papers from the 3rd Mediterranean Conference on Nanophotonics

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Interplay of device structure and intrinsic polymer photophysics and its effects on the ITO/PEDOT:PSS/MEH-PPV/Al photocurrent spectra

J. Nanophoton. 5, 051808 (May 26, 2011); http://dx.doi.org/10.1117/1.3594090

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Abstract

References (76)

Jovana P. Petrović and Petar S. Matavulj

University of Belgrade, Faculty of Electrical Engineering, Belgrade, Serbia

Leon R. Pinto and Sandra R. Živanović

Louisiana Tech University, Institute for Micromanufacturing and Electrical Engineering Program, Ruston, Louisiana 71272

The dc photocurrent spectra of the indium tin oxide/poly(3,4-ethylene- dioxythiophene):poly(styrenesulfonate)/poly (2-methoxy-5-(2´-ethylhexyloxy)-1,4-phenylene- vinylene)Al (ITO/PEDOT:PSS/MEH-PPV/Al) device are measured for three different MEH-PPV thin-film thicknesses in a wide range of bias voltages and for several incident light intensities. The device operation is modeled based on a singlet exciton diffusion and hole polaron drift and diffusion. The Poole–Frenkel transport and the bimolecular Langevine recombination for hole polarons are assumed. The extrinsic photocarrier generation through singlet exciton dissociation on the electrodes and charge transfer in bulk of the polymer film is discussed. We considered three intrinsic charge-carrier photogeneration mechanisms: exciton-exciton annihilation, hot-exciton dissociation, and field dissociation. It is shown that the photocurrent is dominated by the field dissociation of singlet excitons. Experimental results compared to model predictions indicate that absorption coefficient of the MEH-PPV film is thickness dependent. This surprising result is experimentally investigated and confirmed. Excellent agreement between theory and experiment for all the measured photocurrent spectra is achieved.

History

Received Jan 31, 2011
Accepted May 02, 2011
Revised Apr 23, 2011
Published online May 26, 2011

Digital Object Identifier

http://dx.doi.org/10.1117/1.3594090

Citation

Jovana P. Petrović, Petar S. Matavulj, Leon R. Pinto and Sandra R. Živanović, "Interplay of device structure and intrinsic polymer photophysics and its effects on the ITO/PEDOT:PSS/MEH-PPV/Al photocurrent spectra", J. Nanophoton. 5, 051808 (May 26, 2011); http://dx.doi.org/10.1117/1.3594090