Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: Organic electronics and photovoltaics: Transport of charges - from molecules to devices (CPP with HL/TT)
HL 26.1: Talk
Tuesday, March 17, 2015, 09:30–09:45, C 130
Electronic properties of biphenylene and the biphenylene carbon sheet — •Johann Lüder, Biplab Sanyal, Olle Eriksson, Carla Puglia, and Barbara Brena — Department of Physics and Astronomy, Uppsala University, Sweden
Biphenylene (C12H8) is a promising candidate for applications in molecular electronics as well as a building block for two dimensional materials such as the biphenylene carbon (BPC) sheet, a possible alternative for graphene in nanoelectronics. The electronic structure of the gas phase biphenylene molecule is measured by core and valence level spectroscopy and detailed insights are revealed in conjunction with Density Functional Theory calculations. Hybrid functional calculations including the recently proposed OT-RSH functional are compared to GW calculations to provide an accurate theoretical description. Using the band structure obtained from GW calculations, we compute the optical adsorption spectrum by solving the Bethe-Salpeter equation of BPC. Typically for two-dimensional materials, a strong excitonic effect is found and bright and dark excitons are determined.