electron dynamiX

 

The combination of inorganic and organic semiconductors promises hybrid functionality for optoelectronic and light-harvesting applications. Any functionality of such inorganic/organic hybrid system is governed by the electronic levels and resonances at the interface. These determine the efficiency of charge and energy transfer processes, which occur on ultrafast timescales (femto- to picoseconds) and compete with relaxation channels as polaron formation, decay to dark (triplet) states, or trapping at defect sites. Also the electronic structure of the inorganic semiconductor surface is vital for charge and energy transfer processes. Effects like surface band bending and surface photovoltage shifts can occur as well as the formation of thin charge accumulation layers with peculiar non-equilibrium properties, as exemplarily discussed here.

---

related publications

Laura Foglia, Sesha Kumar Vempati, Boubacar Tanda Bonkano, Lukas Gierster, Martin Wolf, Sergey Sadofev, Julia Stähler
Revealing the Competing Contributions of Charge Carriers, Excitons, and Defects to the Non-Equilibrium Optical Properties of ZnO
Struct. Dyn. 6, 034501(2019) (publisher version) (preprint: arXiv:1811.04499)

Sesha Vempati, Jan-Christoph Deinert, Lukas Gierster, Lea Bogner, Clemens Richter, Niklas Mutz, Sylke Blumstengel, Anton Zykov, Stefan Kowarik, Yves Garmshausen, Jana Hildebrandt, Stefan Hecht, Julia Stähler
­­Uncovering the (un-)occupied electronic structure of a buried hybrid interface by selective interfacial photoexcitation
J. Phys.: Cond. Matt. 31, 094001 (2019), (publisher version, OPEN ACCESS) (preprint: arXiv:1811.00779 [cond-mat.mtrl-sci])
***JPCM Special Issue: Internal Interfaces***

Julia Stähler and Patrick Rinke
Global and local aspects of the surface potential landscape for energy level alignment at organic-ZnO interfaces
Chemical Physics 485 149 (2017) (publisher version)

Laura Foglia, Lea Bogner, Martin Wolf and Julia Stähler
Localization-dependent charge separation efficiency at an organic/inorganic hybrid interface
Chem. Phys. Lett. 646 25 (2016) (publisher version) (free full text) ***Frontiers Article***

Laura Foglia, Martin Wolf, Julia Stähler
Ultrafast dynamics in solids probed by femtosecond time-resolved broadband electronic sum frequency generation
Appl. Phys. Lett. 109 202106 (2016) (publisher version)

Jan-Christoph Deinert, Oliver Hofmann, Michael Meyer, Patrick Rinke, Julia Stähler
Local aspects of hydrogen-induced metallization of the ZnO(10-10) surface
Phys. Rev. B 91 235313 (2015) (publisher version) (free full text)

Jan-Christoph Deinert, Daniel Wegkamp, Michael Meyer, Clemens Richter, Martin Wolf, and Julia Stähler
Ultrafast exciton formation at the ZnO(10-10) surface
Phys. Rev. Lett. 113 057602 (2014) (publisher version) (free full text)

O. T. Hofmann, J.-C. Deinert, Y. Xu, P. Rinke, J. Stähler, M. Wolf, and M. Scheffler
Large work function reduction by adsorption of a molecule with a negative electron affinity: Pyridine on ZnO(10-10)
J. Chem. Phys., 139 174701 (2013) (publisher version) (free full text)
***Top 25 of the most viewed JCP articles in 2014!***

J. Stähler, O. T. Hofmann, P. Rinke, S. Blumstengel, F. Henneberger, Y. Li, T. F. Heinz
Raman study of 2,7-bis(biphenyl-4-yl-)2′,7′-ditertbutyl-9,9′-spirobifluorene adsorbed on oxide surfaces
Chem. Phys. Lett. 584 74 (2013) (publisher version) (free full text)