Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Transport and Spectroscopy in Molecular Nanostructures I (related to SYMN, jointly with MO)

CPP 32.3: Vortrag

Mittwoch, 16. März 2011, 14:30–14:45, ZEU 160

Photocurrent of a single Photosystem I — •Daniel Gerster¹, Simone M. Kaniber², Johannes V. Barth¹, Alexander W. Holleitner², Itai Carmeli³, and Joachim Reichert¹ — ¹Physik Department E20, TU München, James-Franck Str, D-85748 Garching — ²Walter Schottky Institut and Physik-Department, TU München, Am Coulombwall, D-85748 Garching — ³Center for NanoScience and Nanotechnology and School of Chemistry, Tel Aviv University, Israel 69978 Tel Aviv

Photosynthesis in plants and bacteria is driven by photoactive bio-molecular complexes. Such photosynthetic reaction centers have evolved approximately 3.5 billion years ago, and they serve as the ultimate source of energy in the biosphere. The photosynthetic process involves an efficient conversion of solar energy to stable chemical energy. Photo-excitation of photosystem I (PS I) causes an electron transfer through a series of redox reactions. We report on the directed photo-current which is generated by a single PS I. The PS I is situated on an Au substrate, and it is electronically contacted by an apertureless scanning near-field optical microscope tip. The tip acts as a light source and counter-electrode at the same time. The PS I is covalently bound to the electronic circuit via cysteine mutation groups located at both ends of the electron transfer path.