The control on the growth of organic semiconductor thin films is one of the most intriguing challenges in the field of organic electronics, in view of understanding film properties and taking advantage of them in devices. Much effort has been devoted to the comprehension of the growth mechanisms, highly dependent on the growth technique and conditions employed, in view of obtaining samples with the desired morphology and properties. Among organic semiconductors, tetraphenylporphyrins (TPPs) are chosen for their great potential in many technological fields, such as gas sensing, energy capture and transfer. Here, we present a comparative study of nickel-TPP thin films deposited, by means of organic molecular beam epitaxy, onto potassium acid phthalate (KAP) crystalline substrates following different growth protocols. The monitoring of film morphology performed ex situ by atomic force microscopy reveals the formation of nanoaggregates, in most cases accompanied by an evolution of the island structure from amorphous to crystalline. By properly adjusting the growth parameters, one single stable phase can be selected and its structure and properties studied.
Pancaldi, A., Raimondo, L., Minotto, A., Sassella, A. (2023). Nanostructure phase selection in vacuum-grown Ni-TPP thin films.. In 109° CONGRESSO NAZIONALE Società Italiana di Fisica Atti del Congresso (pp.165-165).
Nanostructure phase selection in vacuum-grown Ni-TPP thin films.
Pancaldi A.;Raimondo L.;Minotto A.;Sassella A.
2023
Abstract
The control on the growth of organic semiconductor thin films is one of the most intriguing challenges in the field of organic electronics, in view of understanding film properties and taking advantage of them in devices. Much effort has been devoted to the comprehension of the growth mechanisms, highly dependent on the growth technique and conditions employed, in view of obtaining samples with the desired morphology and properties. Among organic semiconductors, tetraphenylporphyrins (TPPs) are chosen for their great potential in many technological fields, such as gas sensing, energy capture and transfer. Here, we present a comparative study of nickel-TPP thin films deposited, by means of organic molecular beam epitaxy, onto potassium acid phthalate (KAP) crystalline substrates following different growth protocols. The monitoring of film morphology performed ex situ by atomic force microscopy reveals the formation of nanoaggregates, in most cases accompanied by an evolution of the island structure from amorphous to crystalline. By properly adjusting the growth parameters, one single stable phase can be selected and its structure and properties studied.
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