Atomic Level Understanding of Interfaces using X-ray photoelectron spectroscopy.

Håkan Rensmo^a

^aDepartment of Physics and Astronomy, Uppsala University, Sweden, Uppsala, Sweden

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Håkan Rensmo, 274
Publication date: 5th February 2015

This presentation focuses on new possibilities in X-ray photoelectron spectroscopy and in particular the use of soft and hard X-ray photoelectron spectroscopy for experimental understanding and design of interfaces in solar cells. The efficiency of the conversion process in these systems is largely dependent on the properties of the interfacial region including atomic and molecular organization as well as orbital composition and energy matching between the materials. Insight into electronic structure of the interface is therefore crucial in order to understand and optimize the function. X-ray based techniques such as photoelectron spectroscopy (PES) are powerful for obtaining such information at an atomic level due to the possibility for element specificity. This contribution reviews some of our recent synchrotron based PES developments for understanding the material interfaces between molecular as well as inorganic materials. Specifically how PES can be used for a surface as well as a near surface technique. Specifically it will be shown how a combination of soft and hard X-ray photoelectron spectroscopy can be used to experimentally understand the molecular orbital structure in molecular materials, the valence electronic structure of perovskite and similar compounds as well as oxide intermixing in conducting thin films [1-3].

1 Johansson, E. Lindblad. R, Siegbahn H., Hagfeldt, A., Rensmo, H., Interface Atomic and Electronic Structure in Dye-Sensitized Nanostructured Solar Cells, ChemPhysChem, 15, 6, 1006 2. Lindblad, R, Jena N.K., Philippe B., Oscarsson J., Bi D., Lindblad A., Mandal S, Pal B., Sarma D.D., Karis O., Siegbahn H. , Johansson E.J., Odelius M. , and Rensmo H. Electronic Structure of CH3NH3PbX3 Perovskites: Dependence on the Halide Moiety J. Phys. Chem. C (accepted) 3. Lindbad, R., Bi, D., Park, B.-W., Oscarsson, J., Gorgoi, M., Siegbahn, H., Odelius, M., Johansson, E.M.J., and Rensmo, H., Electronic Structure of TiO2/CH3NH3Pbl3 Perovskite Solar Cell Interfaces. Journal of Physical Chemistry Letters, 5, 2014, 648

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