Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 104: Transport: Molecular electronics (TT with CPP/HL/MA/O)

HL 104.2: Talk

Friday, March 20, 2015, 09:45–10:00, H 0110

Conductance and thermopower of C₈₂ and endohedral metallofullerene molecular junctions with Au electrodes — •Marius Buerkle¹, See Kei Lee², Ryo Yamada², Hirokazu Tada², and Yoshihiro Asai¹ — ¹AIST, NRI, Tsukuba, Japan — ²Graduate School of Engineering Science, Osaka University, Japan

By combining STM based conductance and thermopower measurements with first-principle transport calculations we investigate the thermoelectric properties of single C₈₂ molecules, and its endohedral metallofullerene (EMF) derivatives Gd@C₈₂ and Ce@C₈₂ bridging Au electrodes. All three molecular junctions show a comparable conductance of around 0.2 G0 and a negative thermopower indicating electron-like transport through the lowest unoccupied molecular orbital (LUMO). However, for the EMF junctions a much larger thermopower is observed which we can relate to changes in the electronic structure induced by the lanthanide atoms.