By Andrés G Muñoz
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Additional info for Photoelectrochemical Solar Conversion Systems: Molecular and Electronic Aspects
The present technology for the construction of heterojunction organic solar cells is based on an intimate mixing of donator and acceptor materials [85,86]. In this way, excitons can be split within their diffusion length at the hetero-contact. Both phases must be blended together to yield a dispersed continuous path for the transport of separated charges to the contacts. Isolated domains can trap charges, causing recombination. 5% are achieved. 17), with an efficiency of 5% [88,89]. In this case, the introduction of a high conducting polymer layer of PEDOT:PSS (poly-3,4-(ethylendioxy)-thiophene with polystyrene-sulfonate) between the photoactive blend and the conducting ITO-glass (indium tin oxide) improves the cell efficiency because of the higher work function of the polymeric layer.
The solar spectrum is indicated as the energy density of photons as a function of photon energy. pair, μe + μh, and at the same time to the energy distance between the quasi-Fermi levels. The light-induced current density at each cell component can be calculated from the difference between the absorbed and the emitted radiation, as proposed by Shockley and Queisser . Let us consider a semiconductor as a blackbody at temperature Tc. 28) Here, the integration is made upon energies higher than the band gap EG,n.
Holes, on the other hand, are transported to the MnCa-complex, where oxygen evolution takes place. The particularity of some microorganisms to generation hydrogen [137,138] by a photosynthetic process constitutes a potential source for the design of bio-inspired conversion systems . The light absorption in photosynthetic and organic conversion systems involves excitation of organic molecules. 25) . The ground and excited states of a molecule are characterized by discrete energy levels delimited by Morse’s curves of potential energy.
Photoelectrochemical Solar Conversion Systems: Molecular and Electronic Aspects by Andrés G Muñoz