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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday , 13 November 2014
(at 13:00 in room HAL 115)
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Using synchrotron x-ray scattering to discover the molecular packing in high performance organic semiconductor thin films

Stefan C. B. Mannsfeld

cfaed, TU Dresden

In polycrystalline thin films of small organic semiconductor molecules, the precise molecular packing determines the film’s intrinsic charge transport properties and consequently the electrical performance in thin-film devices such as organic thin film transistors (OTFTs). Synchrotron X-ray scattering is a powerful method to extract molecular packing details in such films that cannot currently be obtained by any other available technique. It can, in fact, be used to analyze films as thin as a fraction of a single monolayer. We employ a combination of Grazing Incidence X-ray Scattering (GIXS) and advanced crystallographic refinement calculations to obtain a detailed picture of the molecular packing at the emiconductor/dielectric interface in OTFT thin films. The capability to obtain the detailed molecular packing with this approach is highlighted at the example of several organic semiconductor thin film systems, including high performance solution-deposited materials, both n- type and p-type, that exhibit field effect mobilities > 3 cm^2/Vs in the respective OTFT devices.

Brief Bio:

After getting his PhD in Physics at the TU Dresden's IAPP in 2004, Dr. Mannsfeld went to Stanford University to do his postdoc at the Department of Chemical Engineering. From 2009 until his return to Dresden earlier this year, he was a member of the Stanford Institute for Materials and Energy Sciences (SIMES) and worked as Staff Scientist at the SLAC National Accelerator Laboratory. In Dresden, he is currently building up the new cfaed Chair of Organic Devices, with his group's focus being the name-giving “organic devices” in which soft plastic materials are employed to create functional electronic devices and circuits.

Announcement (pdf)

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.10.21 Thu
author: webadmin