Research Center for Organic Electronics ＞ {Finished} The 70th ROEL Lecture Session

The 70th ROEL Lecture Session was held in Conference room on 4th floor in Research Center for Organic Electronics on October 7. We invited Prof. Derck Schlettwein from Justus-Liebig-University Giessen as a guest speaker, and he gave a lecture entitled "Growth of organic thin films and organic/inorganic hybrid materials on microstructured electrode arrays."
Many researchers and students attended to the lecture and the 70th ROEL Lecture Session finished in success.

Conference room during the lecture

Prof. Derck Schlettwein, Institute of Applied Physics and Laboratory of Materials Research, Justus-Liebig-University Giessen

Interdigitated microstructured electrode arrays of gold or silver bands on oxidized silicon
were used as substrates for the vapor-deposition of substituted phthalocyanine thin films or
for the electrodeposition of crystalline ZnO thin films from aqueous precursor solutions. The
specific use of such substrates in the study of film growth and characterization will be shown
for two examples.
The organic semiconductor F16PcCu was characterized in organic field effect transistor
(OFET) geometry. The charge carrier mobility, the threshold voltage and the on/off- ratio
were determined during film preparation in intervals of 1 nm average film thickness. A
conductive channel in the interface region was already formed for 2 nm thick films. By such
in-situ characterization different contributions of interfacial and bulk transport could be
determined and used to optimize films to be used in OFET.
In the pulsed galvanostatic electrodeposition of ZnO from aqueous Zn(NO3)2 solutions,
homogenous films of ZnO were obtained for current densities below the diffusion-limited
regime. For larger current densities, strongly dendritic structures were formed. Film growth
was analyzed based on a duplex diffusion layer model of a steady-state and a pulsed
contribution and consequences for the film growth will be discussed.

Time/Date	October 7th (Mon) PM1:30 - PM3:00
Location	Conference room on 4th floor in Research Center for Organic Electronics
Lecturer	Prof. Derck Schlettwein, Institute of Applied Physics and Laboratory of Materials Research, Justus-Liebig-University Giessen
Subject	Growth of organic thin films and organic/inorganic hybrid materials on microstructured electrode arrays