Journal
LIQUID CRYSTALS
Volume 35, Issue 3, Pages 233-239Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678290701806584
Keywords
nature-inspired liquid crystals; light-harvesting porphyrin; hexagonal phase; homeotropic alignment; photovoltaics
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A new class of nanoscale light-harvesting discotic liquid crystalline porphyrins, with the same basic structure of the best photoreceptor in nature (chlorophyll), was synthesized. These materials can be exceptionally aligned into a highly ordered architecture in which the columns formed by intermolecular pi-pi stacking are spontaneously perpendicular to the substrate. The homeotropic alignment, well confirmed by synchrotron X-ray diffraction, could not only provide the most efficient pathway for hole conduction along the columnar axis crossing the device thickness, but also offer the largest area to the incident light for optimized light harvesting. Their preliminary photocurrent generation and photovoltaic performances were also demonstrated. The results provide new and efficient pathways to the development of organic photovoltaics by using homeotropically aligned liquid crystal thin films.
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