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Transferable Organic Semiconductor Nanosheets for Application in Electronic Devices
Author(s) -
Noever Simon J.,
Eder Michael,
del Giudice Fabio,
Martin Jan,
Werkmeister Franz X.,
Hallwig Stefan,
Fischer Stefan,
Seeck Oliver,
Weber NilsEike,
Liewald Clemens,
Keilmann Fritz,
Turchanin Andrey,
Nickel Bert
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201606283
Subject(s) - pentacene , materials science , semiconductor , organic semiconductor , crystallinity , optoelectronics , monolayer , nanotechnology , layer (electronics) , composite material , thin film transistor
A method has been developed to stabilize and transfer nanofilms of functional organic semiconductors. The method is based on crosslinking of their topmost layers by low energy electron irradiation. The films can then be detached from their original substrates and subsequently deposited onto new solid or holey substrates retaining their structural integrity. Grazing incidence X‐ray diffraction, X‐ray specular reflectivity, and UV–Vis spectroscopy measurements reveal that the electron irradiation of ≈50 nm thick pentacene films results in crosslinking of their only topmost ≈5 nm (3–4 monolayers), whereas the deeper pentacene layers preserve their pristine crystallinity. The electronic performance of the transferred pentacene nanosheets in bottom contact field‐effect devices is studied and it is found that they are fully functional and demonstrate superior charge injection properties in comparison to the pentacene films directly grown on the contact structures by vapor deposition. The new approach paves the way to integration of the organic semiconductor nanofilms on substrates unfavorable for their direct growth as well as to their implementation in hybrid devices with unusual geometries, e.g., in devices incorporating free‐standing sheets.