Experimental Physics VI



    New Paper

    Doping Profile in Planar Hybrid Perovskite Solar Cells Identifying Mobile Ions
    M. Fischer, K. Tvingstedt, A. Baumann, and V. Dyakonov
    ACS Applied Energy Materials Article (2018) [DOI: 10.1021/acs.jpcc.8b08716]

    New Paper

    Photophysics of Deep Blue Acridane- and Benzonitrile-Based Emitter Employing Thermally Activated Delayed Fluorescence
    N. A. Drigo, L. G. Kudriashova, S. Weissenseel, A. Sperlich, A. J. Huckaba, M. K. Nazeeruddin, and V. Dyakonov,
    J. Phys. Chem. C (2018) [DOI: 10.1021/acs.jpcc.8b08716]


    to David Kiermasch and the Photovoltaic Group, winners of the Outstanding Poster Award of the Chemical and Polymer Physics (CPP) Division of the German Physical Society (DPG).
    The prize sponsored by Park Systems Europe GmbH was awarded in the Annual General Meeting of the CPP Division on 15.03.2018 in Berlin.

    The work entitled “Charge carrier recombination in planar n-i-p and p-i-n perovskite solar cells - the role of interfaces” is a collaboration of the Julius Maximilian University Würzburg, Instituto de Ciencia Molecular of University of Valencia in Spain and Bavarian Center for Applied Energy Research (ZAE Bayern). The work presented at the DPG Spring Meeting Berlin 2018 addressed charge carrier recombination dynamics in vacuum deposited planar n-i-p and p-i-n perovskite solar cells with power conversion efficiencies of 20 % and 17 %, respectively. David and coauthors explained the differences between both types of devices by studying charge carrier recombination dynamics with steady state and transient electrical measurements and attributed them to different recombination rates. The work at ZAE Bayern and University of Würzburg were carried out within the project titled “Potential of Perovskite Photovoltaics: Investigation of relevant physical parameters, material properties and efficiency limiting factors in hybrid perovskite solar cells” (HYPER) funded by the Federal Ministry of Education and Research (BMBF) under 03SF0514A and 03SF0514B.

    New Paper

    Revisiting lifetimes from transient electrical characterization of thin film solar cells; a capacitive concern evaluated for silicon, organic and perovskite devices
    D. Kiermasch, A. Baumann, M. Fischer, V. Dyakonov, K. Tvingstedt
    Energy Environ. Sci., 2018,11, 629-640 (2018) [DOI: 10.1039/C7EE03155F]

    New Paper

    Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport and Recombination
    Y. Hu, E. M. Hutter, P. Rieder, I. Grill, J. Hanisch, M. F. Aygüler, A. G. Hufnagel, M. Handloser, E. Ahlswede, Th. Bein, A. Hartschuh, K. Tvingstedt, V. Dyakonov, A. Baumann, T. J. Savenije, M. L. Petrus, P. Docampo
    Adv. Energy Mater. 2018, 8, 1703057 (2018) [DOI: 10.1002/aenm.201703057]


    University of Würzburg newspaper einBLICK interviewed Dr. Hannes Kraus about his recent Nano Letter paper, the  Takasaki-Würzburg project on 3D-writing of spin defects in silicon carbide as well as on his future plans. More.

    Congratulation to Dr. Georgy Astakhov, who was awarded with the Habilitation degree in Experimental Physics for his work “Intrinsic Defects in Silicon Carbide for Quantum Application” after giving the public lecture entitled „Perowskite: eine Struktur mit drei einzigartigen Eigenschaften“. Habilitation is the highest post-doctoral qualification level issued by German universities and is the key for access to a professorship.

    Congratulation to our Silicon Carbide group! Two manuscripts were accepted for publication in high impact journals nearly at the same time, the one on „3D Proton Beam Writing of Optically Active Coherent Vacancy Spins in Silicon Carbide" by Hannes Kraus et al. in Nano Letters and the other one on „Locking of Electron Spin Coherence Above 20 ms in Natural Silicon Carbide“ by Dimitri Simin et al. in Phys. Rev. B. The latter paper has been selected by the editors of PRB to be an Editors’ Suggestion. Have a look at our list of publications.

    Congratulations to Hannes Kraus, who has been awarded a NASA Postdoctoral Program Fellowship at the NASA Jet Propulsion Laboratory. The NASA Postdoctoral Program is extremely selective, and this Fellowship is a recognition of his highly ranked academic and scientific achievement.

    Germany’s international broadcaster Deutsche Welle posted a video on Organic Solar Cells taken in our EP6 labs. Watch the video.

    Congratulations to our perovskite group, who published its recent findings related to various recombination mechanisms in the ACS and NPG journals. In particular, in the ACS Energy Letters they demonstrated how to reduce the shunt and surface recombination by employing polyarylamine as electron transport layer. This work was done in collaboration with our partners from the University of Valencia, Spain. In Scientific Reports they demonstrated how to improve charge carrier lifetime in planar perovskite solar cells by bromine doping. Have a look at our list of publications.




    DFG and the Austrian FWF approved the bilateral proposal "Quantum Control of Spin Centers in Silicon Carbide with Microcavities" under D-A-CH Lead-Agency. The purpose of this project is to realize light matter interfaces based on optically active defects in SiC. Project partners are Dr. Georgy Astakhov, EPVI, Uni Würzburg and Dr. Michael Trupke from Vienna Center for Quantum Science and Technology, TU Vienna.


    DFG and the Russian Science Foundation (RSF) approved the bilateral proposal "Polytype and isotope engineering of silicon carbide for quantum microwave amplifiers". The purpose of this project is to demonstrate quantum microwave amplification in SiC. Project partners are University of Würzburg and Ioffe Institute, Saint Petersburg, Russia. 14 Russian-German research proposals (of more than 120) will be funded under the framework of this first joint call.


    Good news from Brussels! Horizon 2020 Project SEPOMO - Spins for Efficient Photovoltaic Devices based on Organic Molecules was selected for funding. The project objective is to clarify the role of electron spins of photo-generated species in the efficiency of organic solar cells. The EU Commission has granted ca. 4 Mio. Euro to pursue this research and training network in 6 European countries in the coming 4 years.



    Congratulations! The proposal DIABASE “Highly sensitive diamond and carborundum nano-sensors and bio-markers with NIR optical addressability”, submitted under the ERA.Net RUS Plus initiative has been selected for funding. Project partners are: Würzburg / Germany (as Coordinator), Ulm and Stuttgart / Germany, Moscow and St. Petersburg / Russia, Vienna / Austria, Krakow / Poland, Tallin / Estonia,
    Turku / Finland.


    Congratulations to Katrin Anneser, ZAE Bayern and EP6. Her project "Development of an energy efficient solar energy storage system based on a printed solar cell and supercapacitor" will be funded by Deutsche Bundesumweltstiftung (DBU).


    Our new publication on room-temperature single-emitters based on spin centers in SiC: The work entitled "Engineering near infrared single photon emitters with optically active spins in ultrapure silicon carbide" has been accepted for publication in Nature Communications. Have a look at the preprint at arXiv:1407.7065.


    The German Research Council (DFG) established a new Research Training Group (GRK2112) Molecular Biradicals: Structure, Properties and Reactivity, in which EP6 is participating. See also the press release of the University of Würzburg (in German).


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