@misc{AdelmannCuypersTallaridaetal., author = {Adelmann, Christoph and Cuypers, Daniel and Tallarida, Massimo and Rodriguez, Leonard and De Clercq, Astrid and Friedrich, Daniel and Conard, Thierry and Delabie, Annelies and Seo, Jin Won and Locquet, Jean-Pierre and De Gendt, Stefan and Schmeißer, Dieter and Elshocht, Sven van and Caymax, Matty}, title = {Surface Chemistry and Interface Formation during the Atomic Layer Deposition of Alumina from Trimethylaluminum and Water on Indium Phosphide}, series = {Chemistry of Materials}, volume = {25}, journal = {Chemistry of Materials}, number = {7}, issn = {1520-5002}, doi = {10.1021/cm304070h}, pages = {1078 -- 1091}, abstract = {The surface chemistry and the interface formation during the initial stages of the atomic layer deposition (ALD) of Al2O3 from trimethylaluminum (TMA) and H2O on InP(100)were studied by synchrotron radiation photoemission spectroscopy and scanning tunneling microscopy. The effect of the ex situ surface cleaning by either H2SO4 or (NH4)2S was examined. It is shown that the native oxide on the InP surface consisted mainly of indium hydrogen phosphates with a P enrichment at the interface with InP. After a (NH4)2S treatment, S was present on the surface as a sulfide in both surface and subsurface sites. Exposure to TMA led to the formation of a thin AlPO4 layer, irrespective of the surface cleaning. The surface Fermi level of p-type InP was found to be pinned close to midgap after H2SO4 cleaning and moved only slightly further toward the conduction band edge upon TMA exposure, indicating that the AlPO4/InP interface was rather defective. (NH4)2S passivation led to a Fermi level position of p-type InP close to the conduction band edge. Hence, the InP surface was weakly inverted, which can be attributed to surface doping by S donors. TMA exposure was found to remove surface S, which was accompanied by a shift of the Fermi level to midgap, consistent with the removal of (part of) the S donors in combination with a defective AlPO4/InP interface. Further TMA/H2O ALD did not lead to any detectable changes of the AlPO4/InP interface and suggested simple overgrowth with Al2O3.}, language = {en} } @inproceedings{RichterFriedrichPhilipetal., author = {Richter, Matthias and Friedrich, Daniel and Philip, Shine and Paloumpa, Ioanna and M{\"u}ller, Klaus and Schmeißer, Dieter}, title = {Study of P3HT/PCBM based films by NEXAFS}, series = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Reihe 6, Bd. 45}, booktitle = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Reihe 6, Bd. 45}, publisher = {Deutsche Physikalische Gesellschaft}, address = {Bad Honnef}, issn = {0420-0195}, pages = {S. 194}, abstract = {In this contribution we report on investigations of the electronic structure and composition of regioregular poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) based films by using Near Edge X-Ray Absorption Fine Structure (NEXAFS). The measurements were done at the U49/2-PGM2 beam line of BESSY II, Berlin using TEY (total electron yield) and TFY (total fluorescence yield) detection. The samples were produced by spin casting a mixture of P3HT (dissolved in chloroform) and PCBM (dissolved in chlorobenzene) on ITO (indium tin oxide) coated glass slides. Measurements of pure P3HT and PCBM show all typical excitations, whereas the blended system is a weighted superposition of the related peaks. Analyzing these weighted superposition, we observe in the surface sensitive TEY data an accumulation of P3HT, whereas in the bulk sensitive TFY signal an as expected mixture is found. We also show angular dependent NEXAFS measurements of the P3HT/PCBM blend in order to measure the orientation and distribution of the P3HT polymer. Additionally, we will show a new approach for organic solar cell application by introducing ferroelectric nanoparticles into the mixture.}, language = {en} } @misc{KlossekMankovicsArguirovetal., author = {Klossek, Andre and Mankovics, Daniel and Arguirov, Tzanimir V. and Ratzke, Markus and Kirner, Simon and Friedrich, Felice and Gabriel, Onno and Stannowski, Bernd and Schlatmann, Rutger and Kittler, Martin}, title = {Growth process of microcrystalline silicon studied by combined photoluminsescence and Raman investigations}, series = {Journal of applied physics}, volume = {114}, journal = {Journal of applied physics}, issn = {1520-8850}, doi = {10.1063/1.4838058}, pages = {223511}, language = {en} } @misc{GrefTeodoreanuLeihkaufetal., author = {Gref, Orman and Teodoreanu, Ana-Maria and Leihkauf, Rainer and Lohrke, Heiko and Kittler, Martin and Amkreutz, Daniel and Boit, Christian and Friedrich, Felice}, title = {Grain boundary light beam induced current: A characterization of bonded silicon wafers and polycrystalline silicon thin films for diffusion length extraction}, series = {Physica Status Solid A}, volume = {213}, journal = {Physica Status Solid A}, number = {7}, issn = {1862-6319}, doi = {10.1002/pssa.201532987}, pages = {1728 -- 1737}, language = {en} } @misc{FriedrichHollensteinerScherfetal., author = {Friedrich, Ines and Hollensteiner, Jacqueline and Scherf, Janna and Weyergraf, Judith and Klassen, Anna and Poehlein, Anja and Hertel, Robert and Daniel, Rolf}, title = {Complete Genome Sequence of Stenotrophomonas indicatrix DAIF1}, series = {Microbiology Resource Announcements}, volume = {10}, journal = {Microbiology Resource Announcements}, number = {6}, issn = {2576-098X}, doi = {10.1128/MRA.01484-20}, pages = {1 -- 3}, abstract = {We present the complete genome of Stenotrophomonas indicatrix DAIF1, which was isolated from an oligotrophic pond in a water protection area. Whole-genome alignments indicated that strain DAIF1 belongs to the species Stenotrophomonas indicatrix. The whole genome (4,639,375 bp) harbors 4,108 protein-encoding genes, including 3,029 genes with assigned functions.}, language = {en} } @misc{HollensteinerFriedrichHollsteinetal., author = {Hollensteiner, Jacqueline and Friedrich, Ines and Hollstein, Lucas and Lamping, Jan-Philipp and Wolf, Kalina and Liesegang, Heiko and Poehlein, Anja and Hertel, Robert and Daniel, Rolf}, title = {Complete Genome Sequence of Kinneretia sp. Strain DAIF2, Isolated from a Freshwater Pond}, series = {Microbiology Resource Announcements}, volume = {10}, journal = {Microbiology Resource Announcements}, number = {8}, issn = {2576-098X}, doi = {10.1128/MRA.00003-21}, pages = {1 -- 3}, abstract = {Kinneretia sp. strain DAIF2 was isolated from a eutrophic freshwater pond. The genome consists of a single chromosome (6,010,585 bp) with a GC content of 69.3\%. The whole-genome-based phylogeny of DAIF2 revealed a closest relation to the genus Kinneretia.}, language = {en} } @misc{FriedrichHollensteinerSchneideretal., author = {Friedrich, Ines and Hollensteiner, Jacqueline and Schneider, Dominik and Poehlein, Anja and Hertel, Robert and Daniel, Rolf}, title = {First Complete Genome Sequences of Janthinobacterium lividum EIF1 and EIF2 and their Comparative Genome Analysis}, series = {Genome Biology and Evolution}, volume = {12}, journal = {Genome Biology and Evolution}, number = {10}, issn = {1759-6653}, doi = {10.1093/gbe/evaa148}, pages = {1782 -- 1788}, abstract = {We present the first two complete genomes of the Janthinobacterium lividum species, namely strains EIF1 and EIF2, which both possess the ability to synthesize violacein. The violet pigment violacein is a secondary metabolite with antibacterial, antifungal, antiviral, and antitumoral properties. Both strains were isolated from environmental oligotrophic water ponds in G{\"o}ttingen. The strains were phylogenetically classified by ANI analysis and showed a species assignment to Janthinobacterium lividum with 97.72\% (EIF1) and 97.66\% (EIF2) identity. These are the first complete genome sequences of strains belonging to the species Janthinobacterium lividum. The genome of strain EIF1 consists of one circular chromosome (6,373,589 bp) with a GC-content of 61.98\%. The genome contains 5,551 coding sequences, 122 rRNAs, 93 tRNAs, and 1 tm-RNA. The genome of EIF2 comprises one circular chromosome (6,399,352 bp) with a GC-content of 61.63\% and a circular plasmid p356839 (356,839 bp) with a GC-content of 57.21\%. The chromosome encodes 5,691 coding sequences, 122 rRNAs, 93 tRNAs, and 1 tm-RNA and the plasmid harbors 245 coding sequences. In addition to the highly conserved chromosomally encoded violacein operon, the plasmid comprises a non-ribosomal peptide synthetase cluster (NRPS) with similarity to xenoamicin, which is a bioactive compound effective against protozoan parasites.}, language = {en} } @misc{RichterFriedrichSchmeisser, author = {Richter, Matthias and Friedrich, Daniel and Schmeißer, Dieter}, title = {Interlayer-exciton mediated three-hole-Auger-decay in the pi-band of highly oriented pyrolytic graphite}, series = {Physica E}, volume = {Vol. 56}, journal = {Physica E}, issn = {1386-9477}, doi = {10.1016/j.physe.2013.01.015}, pages = {441 -- 446}, abstract = {Resonant photoemission spectroscopy(resPES) is used to probe the occupied pi- and unoccupied pi*-bands of carbon thin films with particular focus on the Auger decay. Highly Oriented Pyrolytic Graphite (HOPG) is studied at the C1s edge. We find strong resonant features at 285.5 eV and 292 eV in the resPES diagram. The normal two-hole Auger decay proceeds under constant kinetic energy (451)only in the sigma*-region. In the pi*-region, however, it proceeds under 67.5° in terms of a Ebind(w) diagram. We attribute this to a multiple Auger decay with a net three hole final state. For this novel decay process we propose a model.We discuss the long lifetime of the first resonant excitation and conclude that it arises from the strong excitonic character of the first resonant state. We use HOPG as a reference system and suggest that this novel process is a tool to identify interlayer-substrate interaction of the carbon layers involved.}, language = {en} } @misc{RichterPaloumpaFriedrichetal., author = {Richter, Matthias and Paloumpa, Ioanna and Friedrich, Daniel and Schmeißer, Dieter}, title = {Multiple Auger Decay At Resonant Photo-Excitation In Carbon Thin Films}, series = {ECS Transactions}, volume = {50}, journal = {ECS Transactions}, number = {20}, doi = {10.1149/05020.0009ecst}, pages = {9 -- 21}, abstract = {We use resonant photoemission at the C1s edge to study the electronic structure of HOPG, graphene flakes and monolayer graphene. We find remarkable differences in the profile of the Auger decay channels, which we attribute to an additional multiple-Auger with a three-hole final state. A prerequisite for the appearance of this decay mechanism is the existence of localized excitonic states, which cause the appearance of the multiple Auger decay. We use those effects to identify the existence and the quantity of such defect states within the π*-band regime in carbon thin films, because the intensity of the three-hole Auger decay is varying with the defect density of the carbon films. We find that the appearance of the multiple Auger decay is different for multilayer and monolayer graphene. In particular the interaction of impurities leads to broadening of the C1s core levels. The three-hole Auger decay spectroscopy is a new method to detect such contaminations with a high sensitivity.}, language = {en} } @misc{RichterFriedrichSchmeisser, author = {Richter, Matthias and Friedrich, Daniel and Schmeißer, Dieter}, title = {Valence and Conduction band states of PCBM as probed by photoelectron spectroscopy at resonant excitation}, series = {BioNanoScience}, volume = {2}, journal = {BioNanoScience}, number = {1}, issn = {2191-1630}, pages = {59 -- 65}, language = {en} }