Title

Nature inspired light-harvesting liquid crystalline porphyrins for organic photovoltaics

Publication Title

Liquid Crystals

Publication Date

2007

Document Type

Article

DOI

10.1080/02678290701806584

Keywords

nature-inspired liquid crystals, light-harvesting porphyrin, hexagonal phase, homeotropic alignment, photovoltaics

Disciplines

Physics

Abstract

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 p–p 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.