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Download fileSearching New Crystalline Substrates for OMBE: Topological and Energetic Aspects of Cleavable Organic Crystals
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posted on 09.02.2016, 00:00 authored by Pavel
N. Zolotarev, Massimo Moret, Silvia Rizzato, Davide M. ProserpioThin films of organic semiconductors
are intensively studied in
view of their exploitation in modern electronic devices. Until now,
few crystalline substrates have been used as clean surfaces for organic
molecular beam epitaxy (OMBE). Among them, β-alanine crystals
recently proved to be valuable substrates because of their cleavage
along (010) surfaces. To increase the set of available substrates,
we searched layered structures through the Cambridge Structural Database
by means of the ToposPro program package. Also, we propose here an
energy partitioning scheme with a new descriptor that allows one to
determine the feasibility of cleaving a crystal along a given crystallographic
plane. This procedure is based on the partition of cohesive energy
among molecules in a given layer in the crystal structure and molecules
found in adjacent layers. The experimental validation on 12 selected
amino acid structures, selected among potentially suitable compounds
for the OMBE trials, showed the reliability of the method proposed
here.