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Self-assembled photosystem-I biophotovoltaics on nanostructured TiO2 and ZnO

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The abundant pigment-protein membrane complex photosystem-I (PS-I) is at the heart of the Earth¡¯s energy cycle. It is the central molecule in the ¡®¡®Z-scheme¡¯¡¯ of photosynthesis, converting sunlight into the chemical energy of life. Commandeering this intricately organized photosynthetic nanocircuitry and re-wiring it to produce electricity carries the promise of inexpensive and environmentally friendly solar power. We here report that dry PS-I stabilized by surfactant peptides functioned as both the light-harvester and charge separator in solar cells self-assembled on nanostructured semiconductors. Contrary to previous attempts at biophotovoltaics requiring elaborate surface chemistries, thin filmdeposition, and illumination concentrated into narrow wavelength ranges the devices described here are straightforward and inexpensive to fabricate and performwell under standard sunlight yielding open circuit photovoltage of 0.5 V, fill factor of 71%, electrical power density of 81 mW/cm2 and photocurrent density of 362 mA/cm2 , over four orders of magnitude higher than any photosystem-based biophotovoltaic to date.

[ Last edited by nxl5096224 on 2012-3-11 at 22:07 ]
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