Self-Organization and nanostructural control in thin film heterojunctions

Camillo Sartorio, Sebastiano Cataldo, Bruno Giuseppe Pignataro, Filippo Giannazzo, Antonino Scandurra

Risultato della ricerca: Articlepeer review

18 Citazioni (Scopus)

Abstract

In spite of more than two-decades of studies of molecular self-assembly, the achievement of low cost, easy-to-implement and multi-tasking bottom-up approaches to address the supramolecular morphology in three-dimensional (3D) systems is still missing. In the particular case of molecular thin films, the 3D nanoscale morphology and function are crucial for both fundamental and applied research. Here we show how it is possible to tune the 3D film structure (domain size, branching etc.) of thin film heterojunctions with a nanoscale accuracy together with the modulation of their optoelectronic properties by employing an easy two-steps approach. At first we prepared multi-planar heterojunctions with programmed sequence of nanoscopic layers. In a second step, thermal stimuli have been employed to induce the formation of bulk heterojunctions with bicontinuous and interdigitated phases having a size below the exciton diffusion length. Importantly, the study of luminescence quenching of these systems can be considered as a useful means for the accurate estimation of the exciton diffusion length of semiconductors in nanoscale blends. Finally, nearly thousand times lower material consumption than spin coating allows a drastic reduction of material wasting and a low-cost implementation, besides the considerable possibility to prepare thin film blends also by employing materials soluble in different solvents.
Lingua originaleEnglish
pagine (da-a)3566-3575
Numero di pagine10
RivistaNanoscale
Volume6
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

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