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Subject: Photoemission electron microscopy × WGL Institute: IOM ×

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    Investigating the morphology of bulk heterojunctions by laser photoemission electron microscopy
    (Amsterdam [u.a.] : Elsevier Science, 2022) Niefind, Falk; Shivhare, Rishi; Mannsfeld, Stefan C.B.; Abel, Bernd; Hambsch, Mike
    The nanoscale morphology of bulk heterojunctions is highly important for the charge dissociation and transport in organic solar cells and ultimately defines the performance of the cell. The visualization of this nano-morphology in terms of domain size and polymer orientation in a fast and straightforward way is therefore of great interest to evaluate the suitability of a film for efficient solar cells. Here, we demonstrate that the morphology of different blends of poly(3-hexylthiophene-2,5-diyl) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) can be imaged and analyzed by employing photoemission electron microscopy.
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    Photoemission electron microscopy of magneto-ionic effects in La0.7Sr0.3MnO3
    (Melville, NY : AIP Publ., 2020) Wilhelm, Marek; Giesen, Margret; Duchoň, Tomáš; Moors, Marco; Mueller, David N.; Hackl, Johanna; Baeumer, Christoph; Hamed, Mai Hussein; Cao, Lei; Zhang, Hengbo; Petracic, Oleg; Glöß, Maria; Cramm, Stefan; Nemšák, Slavomír; Wiemann, Carsten; Dittmann, Regina; Schneider, Claus M.; Müller, Martina
    Magneto-ionic control of magnetism is a promising route toward the realization of non-volatile memory and memristive devices. Magneto-ionic oxides are particularly interesting for this purpose, exhibiting magnetic switching coupled to resistive switching, with the latter emerging as a perturbation of the oxygen vacancy concentration. Here, we report on electric-field-induced magnetic switching in a La0.7Sr0.3MnO3 (LSMO) thin film. Correlating magnetic and chemical information via photoemission electron microscopy, we show that applying a positive voltage perpendicular to the film surface of LSMO results in the change in the valence of the Mn ions accompanied by a metal-to-insulator transition and a loss of magnetic ordering. Importantly, we demonstrate that the voltage amplitude provides granular control of the phenomena, enabling fine-tuning of the surface electronic structure. Our study provides valuable insight into the switching capabilities of LSMO that can be utilized in magneto-ionic devices. © 2020 Author(s).