M. Toerker

Flat Lying Pin-Stripe Phase of Decanethiol Self-Assembled Monolayers on Au(111)

Self-assembled monolayers with low molecular surface density of decanethiol on Au(111) have been prepared by annealing of the densely packed (√3 × √3)R30° structure. High-resolution scanning tunneling microscope (STM) imaging reveals the formation of a 11.5 × √3 stripe structure where the molecules are aligned along the substrate surface in double lamellae. We can deduce from the images that the molecules bind to specific sites at the Au(111) surface rather than adsorb as didecane disulfides. For the first time, a lattice structure for an alkanethiol stripe phase can be derived from the obtained real-space data.

Annealed decanethiol monolayers on Au(111) – intermediate phases between structures with high and low molecular surface density

Abstract Self-assembled monolayers of decanethiol on Au(111) have been investigated using high resolution scanning tunneling microscopy (STM). After the annealing of the as-adsorbed densely packed c(2 3 ×4 3 )R30° structure and before the formation of a previously described low density (11.5× 3 ) stripe phase three different phases with intermediate molecular surface density have been observed. We present highly resolved and distortion-corrected STM images for both the (7.5× 3 ) stripe phase and the meshlike structure. We describe a mixed (7.5/11.5× 3 ) stripe phase that shows a switching of the stripe arrangement.

Highly efficient p-i-n-type organic light emitting diodes on ZnO:Al substrates

Aluminum doped zinc oxide (ZAO) is presented in this letter as an alternative transparent electrode: optimized ZAO films offer excellent parameters for organic light emitting diodes (OLEDs). The ZAO films are applied to various p-i-n-type OLEDs. By using green phosphorescent molecules in a double emitter structure, very high efficiencies were obtained, namely, 54.6cd∕A and 61.5lm∕W for 100cd∕m2 at 2.78V. Additionally, white OLEDs on ZAO demonstrated pure white emission independent of the luminance and high efficiencies of 12.6cd∕A and 14.5lm∕W for 100cd∕m2 at 2.6V, which is comparable to indium-tin-oxide based white OLEDs.