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Proceedings Paper

Orientation-induced molecular rectification in polymer films: improving organic-semiconductor device efficiency
Author(s): Carole Sentein; Celine Fiorini-Debuisschert; Andre Lorin; Paul Raimond; Lionel Sicot; Jean-Michel Nunzi
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Paper Abstract

In the field of organic semiconductor devices, such as electroluminescent diodes or photovoltaic cells, a rectifying junction is mandatory to improve their efficiency. In order to build single polymer film photovoltaic cells, we realize an equivalent distributed p-n junction in a polymeric monolayer. For this purpose, we propose an inter-disciplinary principle derived from the application of nonlinear optical techniques to the technology of polymer semiconductors. We give experimental evidence that molecular rectification induced in an oriented amorphous polymer bearing polar chromophores improves efficiency of polymeric semiconductor device such as photovoltaic cells. Orientation is performed through DC- field ordering of the polar molecules contained in the polymer. Second harmonic generation is used as a probe of the molecular order and permits optimization of the sample orientation parameters, i.e., orientation-field, sample temperature, poling duration and cooling conditions to achieve the largest stable orientation. Additionally, to establish a model which describes charge injection and transport through such device, we propose to use Solid Electric Field Induced Second Harmonic Generation (SEFISHG) as an in situ internal field measurement technique. In this way, before orientation of the molecules, SEFISHG provides the electron work function difference between the two electrode materials, and after orientation, SEFISHG permits the measure of the internal field stored in the structure.

Paper Details

Date Published: 18 May 1999
PDF: 10 pages
Proc. SPIE 3623, Organic Photonic Materials and Devices, (18 May 1999); doi: 10.1117/12.348410
Show Author Affiliations
Carole Sentein, CEA-LETI (France)
Celine Fiorini-Debuisschert, CEA-LETI (France)
Andre Lorin, CEA-LETI (France)
Paul Raimond, CEA-LETI (France)
Lionel Sicot, CEA-LETI (France)
Jean-Michel Nunzi, CEA-LETI (France)

Published in SPIE Proceedings Vol. 3623:
Organic Photonic Materials and Devices
Bernard Kippelen, Editor(s)

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