Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 18: Carbon: Diamond, nanotubes and Buckyballs

HL 18.3: Vortrag

Montag, 31. März 2014, 15:30–15:45, POT 112

Photocurrent from Hybrid Systems Based on Diamond and Bacterial Reaction Centers — •Réka Csiki, Roberta Caterino, Matthias Sachsenhauser, Philipp Niedermayr, Martin Stutzmann, Anna Cattani-Scholz, and Jose Antonio Garrido — Walter Schottky Institut, TU München, Am Coulombwall 4, 85748 Garching

Photoactive reaction centers (RCs) are protein complexes which can convert sunlight into other forms of energy with high efficiency. These proteins can generate a photocurrent under photostimulation when they are immobilized on and electrically connected to inorganic electrodes. In this contribution we show that heavily boron-doped polycrystalline diamond can be chemically modified by covalently attaching the linker molecule 6-phosphonohexanoic acid to the diamond surface, creating a suitable environment for a subsequent attachment of bacterial reaction centers. Two important mediators are involved in the natural charge transfer process of the bacterial RCs: the coenzyme Q₀ and the redox protein cytochrome c. The role of these two mediators in the photocurrent generation from photoactive RCs immobilized on functionalized diamond electrodes will be reported together with a discussion on the voltage dependence of the induced photocurrent. We demonstrated that OH-terminated diamond surfaces can be functionalized with organophosphonates and, together with the attached reaction centers, represent a suitable biohybrid system for energy harvesting.