Ifland, Benedikt

[["dc.bibliographiccitation.artnumber","063046"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Hoffmann, Joerg"],["dc.contributor.author","Kressdorf, Birte"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Seibt, Michael"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2018-11-07T10:22:28Z"],["dc.date.available","2018-11-07T10:22:28Z"],["dc.date.issued","2017"],["dc.description.abstract","The effect of correlation effects on photovoltaic energy conversion at manganite/titanite heterojunctions is investigated. As a model system we choose a heterostructure consisting of the small polaron absorber Pr0.66Ca0.34MnO3 (PCMO) epitaxially grown on single-crystalline Nb-doped SrTi0.998Nb0.002O3 (STNO) substrates. The high structural and chemical quality of the interfaces is proved by detailed characterization using high-resolution transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) studies. Spectrally resolved and temperature-dependent photovoltaic measurements show pronounced contributions of both the Jahn-Teller (JT) excitations and the charge transfer (CT) transitions to the photovoltaic effect at different photon energies. A linear temperature dependence of the open-circuit voltage for an excitation in the PCMO manganite is only observed below the charge-ordering temperature, indicating that the diffusion length of the photocarrier exceeds the size of the space charge region. The photovoltaic response is compared to that of a heterojunction of lightly doped Pr0.05Ca0.95MnO3 (CMO)/STNO, where the JT transition is absent. Here, significant contributions of the CT transition to the photovoltaic effect set in below the Neel temperature. We conclude that polaronic correlations and ordering effects are essentials for photovoltaic energy conversion in manganites."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [SFB1073]"],["dc.description.sponsorship","Open-Access-Publikationsfonds 2017"],["dc.identifier.doi","10.1088/1367-2630/aa6c22"],["dc.identifier.isi","000404761900009"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14592"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42283"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B02 Photonen-getriebener Energietransfer über Grenzflächen zwischen Materialien mit starken Korrelationen"],["dc.relation.issn","1367-2630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.title","Contribution of Jahn-Teller and charge transfer excitations to the photovoltaic effect of manganite/titanite heterojunctions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","1600358"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","physica status solidi (RRL) - Rapid Research Letters"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Peretzki, Patrick"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Jooss, Christian"],["dc.contributor.author","Seibt, Michael"],["dc.date.accessioned","2018-11-07T10:28:51Z"],["dc.date.available","2018-11-07T10:28:51Z"],["dc.date.issued","2017"],["dc.description.abstract","Electron beam induced current (EBIC) at p-n junctions can be measured in high spatial resolution using a thin lamella geometry, where most incident electrons transmit the sample. We explore the case of low excitation energies in a wedge-shaped lamella geometry to increase resolution in a controlled way. We compare a sample with high (Si) and low (manganite-titanate heterojunction) diffusion length and use Monte Carlo based simulations as a reference. It is shown that the EBIC signal obtained from the Si junction vanishes below a thickness of 300 nm, whereas this happens at 80 nm in the PCMO-STNO junction. This allows for achieving an EBIC resolution of better than 50 nm for the latter system. The observed fundamental differences between the silicon and the perovskite junction are discussed in terms of preparation induced 'dead' layers and surface recombination."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [SFB1073]"],["dc.identifier.doi","10.1002/pssr.201600358"],["dc.identifier.isi","000396401500012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43519"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1862-6270"],["dc.relation.issn","1862-6254"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Low energy scanning transmission electron beam induced current for nanoscale characterization of p-n junctions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","935167"],["dc.bibliographiccitation.journal","Journal of Nanomaterials"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Hoffmann, Joerg"],["dc.contributor.author","Kramer, Thilo"],["dc.contributor.author","Scherff, Malte"],["dc.contributor.author","Mildner, Stephanie"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2018-11-07T10:02:49Z"],["dc.date.available","2018-11-07T10:02:49Z"],["dc.date.issued","2015"],["dc.description.abstract","The deposition of heteroepitaxial thin films on single crystalline substrates by means of physical deposition methods is commonly accompanied by mechanical strain due to lattice mismatch and defect generation. Here we present a detailed analysis of the influence of strain on the Mn solubility of Pr1-xCaXMnO3 thin films prepared by ion-beam sputtering. Combining results from X-ray diffraction, transmission electron microscopy and in situ hot-stage stress measurements, we give strong evidence that large tensile strain during deposition limits the Mn solubility range of the Perovskite phase to near-stoichiometric composition. Mn excess gives rise to MnO2. precipitates and the precipitation seems to represent a stress relaxation path. With respect to size and density of the precipitates, the relaxation process can be affected by the choice of substrate and the deposition parameters, that is, the deposition temperature and the used sputter gas."],["dc.description.sponsorship","DFG [SFB 1073]"],["dc.identifier.doi","10.1155/2015/935167"],["dc.identifier.isi","000363631200001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12547"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38308"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B02 Photonen-getriebener Energietransfer über Grenzflächen zwischen Materialien mit starken Korrelationen"],["dc.relation.issn","1687-4129"],["dc.relation.issn","1687-4110"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 3.0"],["dc.title","Strain Driven Phase Decomposition in Ion-Beam Sputtered Pr1-XCaXMnO3 Films"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","1602174"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Advanced Energy Materials"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Raiser, Dirk"],["dc.contributor.author","Mildner, Stephanie"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Sotoudeh, Mohsen"],["dc.contributor.author","Bloechl, Peter E."],["dc.contributor.author","Techert, Simone"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2018-11-07T10:22:36Z"],["dc.date.available","2018-11-07T10:22:36Z"],["dc.date.issued","2017"],["dc.description.abstract","Understanding and controlling the relaxation process of optically excited charge carriers in solids with strong correlations is of great interest in the quest for new strategies to exploit solar energy. Usually, optically excited electrons in a solid thermalize rapidly on a femtosecond to picosecond timescale due to interactions with other electrons and phonons. New mechanisms to slow down thermalization will thus be of great significance for efficient light energy conversion, e.g., in photovoltaic devices. Ultrafast optical pump-probe experiments in the manganite Pr0.65Ca0.35MnO3, a photovoltaic, thermoelectric, and electrocatalytic material with strong polaronic correlations, reveal an ultraslow recombination dynamics on a nanosecond-time scale. The nature of long living excitations is further elucidated by photovoltaic measurements, showing the presence of photodiffusion of excited electron-hole polaron pairs. Theoretical considerations suggest that the excited charge carriers are trapped in a hot polaron state. Escape from this state is possible via a slow dipole-forbidden recombination process or via rare thermal fluctuations toward a conical intersection followed by a radiation-less decay. The strong correlation between the excited polaron and the octahedral dynamics of its environment appears to be substantial for stabilizing the hot polaron."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [CRC 1073, CRC 755]"],["dc.identifier.doi","10.1002/aenm.201602174"],["dc.identifier.isi","000403913400011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42306"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B02 Photonen-getriebener Energietransfer über Grenzflächen zwischen Materialien mit starken Korrelationen"],["dc.relation","SFB 1073 | Topical Area B | B03 Relaxation, Thermalisierung, Transport und Kondensation in hochangeregten Festkörpern"],["dc.relation","SFB 1073 | Topical Area C | C02 In situ hochauflösende Untersuchung des aktiven Zustands bei der photo- und elektrochemischen Wasserspaltung"],["dc.relation","SFB 1073 | Topical Area C | C03 Vom Elektronentransfer zur chemischen Energiespeicherung: ab-initio Untersuchungen korrelierter Prozesse"],["dc.relation.issn","1614-6840"],["dc.relation.issn","1614-6832"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Techert (Structural Dynamics in Chemical Systems)"],["dc.rights","CC BY-NC 4.0"],["dc.title","Evolution of Hot Polaron States with a Nanosecond Lifetime in a Manganite Perovskite"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","235150"],["dc.bibliographiccitation.issue","23"],["dc.bibliographiccitation.journal","Physical Review B"],["dc.bibliographiccitation.volume","95"],["dc.contributor.author","Sotoudeh, Mohsen"],["dc.contributor.author","Rajpurohit, Sangeeta"],["dc.contributor.author","Blöchl, Peter"],["dc.contributor.author","Mierwaldt, Daniel"],["dc.contributor.author","Norpoth, Jonas"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Mildner, Stephanie"],["dc.contributor.author","Kressdorf, Birte"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2020-12-10T18:25:03Z"],["dc.date.available","2020-12-10T18:25:03Z"],["dc.date.issued","2017"],["dc.description.abstract","The electronic structure of Pr1-xCaxMnO3 has been investigated using a combination of first-principles calculations, x-ray photoelectron spectroscopy (XPS), x-ray absorption spectroscopy (XAS), electron-energy loss spectroscopy (EELS), and optical absorption. The full range of compositions, x = 0,1/2,1, and a variety of magnetic orders have been covered. Jahn-Teller as well as Zener polaron orders are considered. The free parameters of the local hybrid density functionals used in this study have been determined by comparison with measured XPS spectra. A model Hamiltonian, valid for the entire doping range, has been extracted. A simple local-orbital picture of the electronic structure for the interpretation of experimental spectra is provided. The comparison of theoretical calculations and different experimental spectra provide a detailed and consistent picture of the electronic structure. The large variations of measured optical absorption spectra are traced back to the coexistence of magnetic orders (respectively, to the occupation of local orbitals). A consistent treatment of the Coulomb interaction indicates a partial cancellation of Coulomb parameters and supports the dominance of the electron-phonon coupling."],["dc.identifier.doi","10.1103/PhysRevB.95.235150"],["dc.identifier.eissn","2469-9969"],["dc.identifier.isi","000404468000001"],["dc.identifier.issn","2469-9950"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75564"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B02 Photonen-getriebener Energietransfer über Grenzflächen zwischen Materialien mit starken Korrelationen"],["dc.relation","SFB 1073 | Topical Area B | B03 Relaxation, Thermalisierung, Transport und Kondensation in hochangeregten Festkörpern"],["dc.relation","SFB 1073 | Topical Area C | C02 In situ hochauflösende Untersuchung des aktiven Zustands bei der photo- und elektrochemischen Wasserspaltung"],["dc.relation","SFB 1073 | Topical Area C | C03 Vom Elektronentransfer zur chemischen Energiespeicherung: ab-initio Untersuchungen korrelierter Prozesse"],["dc.relation.issn","2469-9969"],["dc.relation.issn","2469-9950"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Electronic structure of Pr1-xCaxMnO3"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1467"],["dc.bibliographiccitation.journal","Beilstein Journal of Nanotechnology"],["dc.bibliographiccitation.lastpage","1484"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Peretzki, Patrick"],["dc.contributor.author","Kressdorf, Birte"],["dc.contributor.author","Saring, Philipp"],["dc.contributor.author","Kelling, Andreas"],["dc.contributor.author","Seibt, Michael"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2018-11-07T09:54:41Z"],["dc.date.available","2018-11-07T09:54:41Z"],["dc.date.issued","2015"],["dc.description.abstract","After a general introduction into the Shockley theory of current voltage (J-V) characteristics of inorganic and organic semiconductor junctions of different bandwidth, we apply the Shockley theory-based, one diode model to a new type of perovskite junctions with polaronic charge carriers. In particular, we studied manganite-titanate p-n heterojunctions made of n-doped SrTi1-yNbyO3, y = 0.002 and p-doped Pr1-xCaxMnO3, x = 0.34 having a strongly correlated electron system. The diffusion length of the polaron carriers was analyzed by electron beam-induced current (EBIC) in a thin cross plane lamella of the junction. In the J-V characteristics, the polaronic nature of the charge carriers is exhibited mainly by the temperature dependence of the microscopic parameters, such as the hopping mobility of the series resistance and a colossal electro-resistance (CER) effect in the parallel resistance. We conclude that a modification of the Shockley equation incorporating voltage-dependent microscopic polaron parameters is required. Specifically, the voltage dependence of the reverse saturation current density is analyzed and interpreted as a voltage-dependent electron-polaron hole-polaron pair generation and separation at the interface."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG), project B02 [SFB1073]"],["dc.identifier.doi","10.3762/bjnano.6.152"],["dc.identifier.isi","000357558400001"],["dc.identifier.pmid","26199851"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36591"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B02 Photonen-getriebener Energietransfer über Grenzflächen zwischen Materialien mit starken Korrelationen"],["dc.relation.issn","2190-4286"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 2.0"],["dc.title","Current-voltage characteristics of manganite-titanite perovskite junctions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","362"],["dc.bibliographiccitation.lastpage","363"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Fischgrabe, Florian"],["dc.contributor.author","Merten, Sebastian"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Moschnyaga, Vasily"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2021-12-08T12:29:15Z"],["dc.date.available","2021-12-08T12:29:15Z"],["dc.date.issued","2016"],["dc.identifier.doi","10.1002/9783527808465.EMC2016.6716"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/96010"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.publisher","Wiley-VCH Verlag GmbH & Co. KGaA"],["dc.publisher.place","Weinheim, Germany"],["dc.relation.eisbn","9783527808465"],["dc.relation.isbn","9783527808465"],["dc.relation.ispartof","European Microscopy Congress 2016: Proceedings"],["dc.title","HR(S)TEM, EELS and Raman spectroscopy analysis of a LCMO and PCMO films"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]