5 papers
Ultrafast generation and decay of a surface metal
Lukas Gierster, Sesha Vempati, Julia Stähler
Band bending at semiconductor surfaces induced by chemical doping or electric fields can create metallic surfaces with properties not found in the bulk, such as high electron mobil…
Distinguishing strain, charge and molecular orbital induced effects on the electronic structure: graphene/ammonia system
Tanmay Das, Sesha Vempati
Molecular adsorption at the surface of a 2D material poses numerous questions regarding the modification to the band structure and interfacial states, which of course deserve full…
Photoexcited organic molecules to highly efficient autoionization
Sesha Vempati, Lea Bogner, Clemens Richter +4
The conversion of optical and electrical energy in novel materials is key to modern optoelectronic and light-harvesting applications. Here, we investigate the equilibration dynamic…
Uncovering the (un-)occupied electronic structure of a buried hybrid interface
S. Vempati, J. -C. Deinert, L. Gierster +10
The energy level alignment at organic/inorganic (o/i) semiconductor interfaces is crucial for any light-emitting or -harvesting functionality. Essential is the access to both occup…
Revealing the Competing Contributions of Charge Carriers, Excitons, and Defects to the Non-Equilibrium Optical Properties of ZnO
Laura Foglia, Sesha Vempati, Boubacar Tanda Bonkano +4
Due to its wide band gap and high carrier mobility, ZnO is an attractive material for light-harvesting and optoelectronic applications. Its functional efficiency, however, is stron…