Surface analytical studies of interfaces in organic semiconductor devices

Van Der Waals Heterostructures between Small Organic Molecules and Layered Substrates

“…Organic (opto-)electronics are attracting tremendous attention for their mechanical flexibility, light weight, low cost, and available large scale production in organic light emitting diodes (OLEDs), organic photovoltaics (OPVs), and organic field effect transistors (OFETs) [1][2][3][4][5]. The quality of organic semiconductor thin films is one of the key components for a better device performance.…”

Fine-Tuning the Electrostatic Properties of an Alkali-Linked Organic Adlayer on a Metal Substrate

“…5,6 Alkali metals are also exploited as dopants, thanks to their low ionization potential and their strong donor properties. 7 Alternative procedures are based on the insertion of additional layers (interlayers) between the metallic electrode and the organic semiconductor, which modify the interface dipole. 8À11 For example, thin interlayers of organic molecules 12 and molecular acceptors can positively modify the work-function and the injection barriers of noble metal substrates.…”

Probing the electrode-polymer interface in conjugated polymer devices with surface-enhanced Raman scattering

“…2,3 In particular, the interface between a polymer and a metal electrode is almost ubiquitous in polymer-based devices and is suspected to play an important role in their overall performance and stability. 4 Accordingly, significant attention has been focused on the conformation and energetic alignment of polymers and molecules at this interface. 4,5 Optical spectroscopy techniques are facile tools for characterizing polymer-based devices [6][7][8] and can be used to probe non-pristine interfaces that are likely to occur in a production environment.…”

“…4 Accordingly, significant attention has been focused on the conformation and energetic alignment of polymers and molecules at this interface. 4,5 Optical spectroscopy techniques are facile tools for characterizing polymer-based devices [6][7][8] and can be used to probe non-pristine interfaces that are likely to occur in a production environment. 9 In particular, Raman scattering, where the vibrational modes of a molecule are mapped out through the inelastic scattering of light, is capable of elucidating subtle structural and chemical differences in molecular systems and has been successfully utilized to probe important changes 10,11 and degradation effects [12][13][14] in organic thin films and device structures.…”