for Fiscal Year 2010 Project Title : Theoretical Modeling of Photosynthesis
نویسنده
چکیده
1. Background and purpose Recently we have studied a model [1] of lightinduced proton and electron pump in artificial reaction centers. The model contains a molecular triad, which is inserted between two (either proton or electron) reservoirs. The molecular triad transports protons (mediated by a shuttle) and electrons energetically uphill: from the lower energy reservoir to the higher energy reservoir, using the energy of light. Applying the methods of quantum transport theory, we calculated the ranges of light intensity and potential energy of the electron/proton reservoir that maximize both the light-induced proton/electron current and the energy-transduction efficiency. We also have shown that under resonant tunneling conditions, and strong coupling of molecular triads with leads, the power conversion efficiency increases drastically. Thus, we obtained the optimalefficiency conditions. We also have extended our models presented in Ref [1] including additional four lightharvesting pigments (LHP). We consider two different kinds of arrangements of the accessory light-harvesting pigments around the reaction center. The first arrangement allows direct excitation transfer to the reaction center from all the surrounding pigments. The second configuration transmits energy via a cascade mechanism along a chain of light-harvesting chromophores, where only one chromophore is connected to the reaction center. We have shown that the artificial photosynthetic system using the cascade energy transfer absorbs photons in a broader wavelength range and converts their energy into electricity with a higher efficiency than the system based on direct couplings between all the antenna chromophores and the reaction center.
منابع مشابه
RICC Usage Report for Fiscal Year 2013 Project Title : Theoretical Modeling of Photosynthesis
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