Special Section: Selected Papers from the 3rd Mediterranean Conference on Nanophotonics

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

[+] Author Affiliations
Jovana P. Petrović, Petar S. Matavulj

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

Leon R. Pinto, Sandra R. Živanović

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

J. Nanophoton. 5(1), 051808 (May 26, 2011). doi:10.1117/1.3594090
History: Received January 31, 2011; Revised April 23, 2011; Accepted May 02, 2011; Published May 26, 2011; Online May 26, 2011
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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.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

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(1), 051808 (May 26, 2011). ; http://dx.doi.org/10.1117/1.3594090


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