Orientation-induced molecular rectification in polymer films: improving organic-semiconductor device efficiency

Carole Sentein; Celine Fiorini-Debuisschert; Andre Lorin; Paul Raimond; Lionel Sicot; Jean-Michel Nunzi

doi:10.1117/12.348410

18 May 1999 Orientation-induced molecular rectification in polymer films: improving organic-semiconductor device efficiency

Carole Sentein, Celine Fiorini-Debuisschert, Andre Lorin, Paul Raimond, Lionel Sicot, Jean-Michel Nunzi

Author Affiliations +

Proceedings Volume 3623, Organic Photonic Materials and Devices; (1999) https://doi.org/10.1117/12.348410
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

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.

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Carole Sentein, Celine Fiorini-Debuisschert, Andre Lorin, Paul Raimond, Lionel Sicot, and Jean-Michel Nunzi "Orientation-induced molecular rectification in polymer films: improving organic-semiconductor device efficiency", Proc. SPIE 3623, Organic Photonic Materials and Devices, (18 May 1999); https://doi.org/10.1117/12.348410

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KEYWORDS

Polymers

Molecules

Solar cells

Polymer thin films

Electrodes

Aluminum

Photovoltaics

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