Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901449
Keywords
asymmetric photoexcitation; bio-photovoltaic; in-plane electric field; semiartificial photosynthetic system
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Funding
- MOE AcRF 1 [R-284-000-161-114]
- Biotechnology and Biological Sciences Research Council (BBSRC) [BB/I022570/1]
- BrisSynBio Synthetic Biology Research Centre at the University of Bristol - BBSRC [BB/L01386X/1]
- Engineering and Physical Sciences Research Council (EPSRC) of the UK
- BBSRC [BB/L01386X/1, BB/I022570/1] Funding Source: UKRI
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Semiartificial photosynthetic systems have opened up new avenues for harvesting solar energy using natural photosynthetic materials in combination with synthetic components. This work reports a new, semiartificial system for solar energy conversion that synergistically combines photoreactions in a purple bacterial photosynthetic membrane with those in three types of transition metal-semiconductor Schottky junctions. A transparent film of a common transition metal interfaced with an n-doped silicon semiconductor exhibits an in-plane potential gradient when a light-penetration variance is established on its surface by optical shading of photoabsorbing photosynthetic membranes. The in-plane potential gradients (0.08-0.3 V) enable a directional charge transport between the synthetic and natural photoelectric systems, which is further enhanced in a device setting by a biocompatible thixotropic gel electrolyte that permeates the membrane multilayer, facilitating a strong and steady photoelectric current as high as 1.3 mA cm(-2), the highest achieved so far with any anoxygenic photosynthetic system.
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