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            <title xml:lang="en">Optically addressed light modulators using an organic photovoltaic layer</title>
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                <title xml:lang="en">Optically addressed light modulators using an organic photovoltaic layer</title>
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                <authority type="supervisor">Thomas Heiser</authority>
                <authority type="jury">Malgosia Kaczmarek [Président]</authority>
                <authority type="jury">Kristiaan Neyts [Rapporteur]</authority>
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                <term xml:lang="en">Photonics</term>
                <term xml:lang="en">Optoelectronic devices</term>
                <term xml:lang="en">Displays</term>
                <term xml:lang="en">Liquid crystals</term>
                <term xml:lang="en">Electronics</term>
                <term xml:lang="en">Optics</term>
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                <term xml:lang="fr">Fabrication de dispositifs optoélectroniques</term>
                <term xml:lang="fr">Afficheurs</term>
                <term xml:lang="fr">Cristaux liquides</term>
                <term xml:lang="fr">Photovoltaïque</term>
                <term xml:lang="fr">Électronique</term>
                <term xml:lang="fr">Optique</term>
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              <p>The performances of liquid crystals (LCs) based optically addressed Spatial Light Modulators (OASLMs) strongly depends on the photosensitive layer properties. To accommodate device transparency, lateral resolution and low cost production, organic semiconductors appear as the ideal candidates. We chose to use a P3HT: PCBM blend as the photosensitive layer. Our results showed that the liquid crystals reorient according to the luminous intensity alone and without external power supply. Additional measurements indicate that the photovoltaic effect is at the origin of this phenomenon. This type of device allowed spatial modulation of the LCs orientation and demonstrates its potential in holographic applications. A second type of device integrating interfacial layers of PEIE and PEDOT: PSS allowed us to control the orientation of the LCs and gives promising routes towards the design of self-sustainable OASLMs.</p>
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              <p>Les performances des modulateurs de lumières à commande optique (OASLMs) à base de cristaux liquides (CLs) dépendent fortement des propriétés de la couche photosensible. Afin de concilier transparence, résolution latérale et production à bas coûts, les semi-conducteurs organiques apparaissent comme des candidats idéaux. Nous avons choisi d'utiliser un mélange P3HT:PCBM comme couche photosensible. Nos résultats ont montré que les cristaux liquides se réorientaient en fonction de l'intensité lumineuse seule et sans tension appliquée. Des mesures complémentaires indiquent que l'effet photovoltaïque est à l'origine de ce phénomène. Ce type de dispositif nous permet de moduler spatialement l'orientation des CLs et démontre son potentiel dans des applications liées à l'holographie. Un second type de dispositif intégrant des couches d'interfaces de PEIE et de PEDOT:PSS nous permet de contrôler l'orientation des CLs et donne de nouvelles pistes permettant de fabriquer des OASLMs autonomes.</p>
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