Self-powered photovoltaic liquid crystal light modulators (SP-PSLM)

Sadiara Fall; Nicolas Brouckaert; Yaochen Lin; Nina Podoliak; Malgosia Kaczmarek; Giampaolo D'Alessandro; Mohammed Ibn Elhaj; Lachezar Komitov; Thomas Heiser

doi:10.1117/12.2594240

1 August 2021 Self-powered photovoltaic liquid crystal light modulators (SP-PSLM)

Sadiara Fall, Nicolas Brouckaert, Yaochen Lin, Nina Podoliak, Malgosia Kaczmarek, Giampaolo D'Alessandro, Mohammed Ibn Elhaj, Lachezar Komitov, Thomas Heiser

Author Affiliations +

Proceedings Volume 11807, Liquid Crystals XXV; 118070A (2021) https://doi.org/10.1117/12.2594240
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States

Abstract

Photo-voltaic light modulators consist of a liquid crystal layer integrated with an organic photovoltaic structure. Addressing them with light produces an internal voltage that changes the liquid crystal orientation and the optical transmission properties of the device. They offer an exciting prospect for autonomous, light controlled smart displays and visors. Herein we report the development of self-activated light modulators, whose transmittance drops with increasing light intensity without applying an external power supply. This could be achieved by introducing a tandem photovoltaic structure that allows to produce larger voltages. Crossed polarized intensity measurements on devices based on different liquid crystals and photovoltaic layers are presented to clarify the physical mechanisms underlying self-activation.

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Sadiara Fall, Nicolas Brouckaert, Yaochen Lin, Nina Podoliak, Malgosia Kaczmarek, Giampaolo D'Alessandro, Mohammed Ibn Elhaj, Lachezar Komitov, and Thomas Heiser "Self-powered photovoltaic liquid crystal light modulators (SP-PSLM)", Proc. SPIE 11807, Liquid Crystals XXV, 118070A (1 August 2021); https://doi.org/10.1117/12.2594240

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KEYWORDS

Liquid crystals

Modulators

Photovoltaics

Measurement devices

Transmittance

Photonic crystals

Polarizers

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