期刊
CHEMSUSCHEM
卷 3, 期 4, 页码 471-475出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.200900255
关键词
electron transfer; fluorescence; photosynthesis; self-assembly; surface chemistry
资金
- Rutgers Energy Institute
- Rutgers University
- Institute for Advanced Materials, Devices and Nanotechnologies (IAMDN) at Rutgers University
- Strategic Environmental Research and Development Program
- NASA
- AFOSR
By using a nondestructive, ultrasensitive, fluorescence kinetic technique, we measure in situ the photochemical energy conversion efficiency and electron transfer kinetics on the acceptor side of histidine-tagged photosystem II core complexes tethered to gold surfaces. Atomic force microscopy images coupled with Rutherford backscattering spectroscopy measurements further allow us to assess the quality, number of layers, and surface density of the reaction center films. Based on these measurements, we calculate that the theoretical photo-electronic current density available for an ideal monolayer of core complexes is 43 mu A cm(-2) at a photon flux density of 2000 mu mol quanta m(-2) s(-1) between 365 and 750 nm. While this current density is approximately two orders of magnitude lower than the best organic photovoltaic cells (for an equivalent area), it provides an indication for future improvement strategies. The efficiency could be improved by increasing the optical cross section, by tuning the electron transfer physics between the core complexes and the metal surface, and by developing a multilayer structure, thereby making biomimetic photoelectron devices for hydrogen generation and chemical sensing more viable.
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