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Thermal Stability and Molecular Ordering of Organic Semiconductor Monolayers: Effect of an Anchor Group
Author(s) -
Jones Andrew O. F.,
Knauer Philipp,
Resel Roland,
Ringk Andreas,
Strohriegl Peter,
Werzer Oliver,
Sferrazza Michele
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500098
Subject(s) - monolayer , alkyl , thermal stability , substrate (aquarium) , melting point , molecule , perylene , organic semiconductor , chemistry , semiconductor , crystallography , materials science , stereochemistry , organic chemistry , nanotechnology , optoelectronics , geology , oceanography
The thermal stability and molecular order in monolayers of two organic semiconductors, PBI‐PA and PBI‐alkyl, based on perylene derivatives with an identical molecular structure except for an anchor group for attachment to the substrate in PBI‐PA, are reported. In situ X‐ray reflectivity measurements are used to follow the stability of these monolayers in terms of order and thickness as temperature is increased. Films have thicknesses corresponding approximately to the length of one molecule; molecules stand upright on the substrate with a defined structure. PBI‐PA monolayers have a high degree of order at room temperature and a stable film exists up to 250 °C, but decomposes rapidly above 300 °C. In contrast, stable physisorbed PBI‐alkyl monolayers only exist up to 100 °C. Above the bulk melting point at 200 °C no more order exists. The results encourage using anchor groups in monolayers for various applications as it allows enhanced stability at the interface with the substrate.