Cellules bio-photovoltaïques : nouveaux développements


University of Tennessee, MIT et EPF Lausanne collaborent pour le développement d'un processus augmentant le rendement de la production d'électricité à partir de structures moléculaires extraites des plantes, plus facilement et à coût réduit.
Ils exposent les derniers résultats dans le dernier numéro de Nature: Scientific Reports 2 - Article: 234
Self-assembled photosystem-I biophotovoltaics on nanostructured TiO2 and ZnO
A la base le composant Photosystème-I (PS-I )contenu dans certaines algues. Ce dernier est traité pour agir avec un semiconducteur,

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 film deposition, and illumination concentrated into narrow wavelength ranges the devices described here are straightforward and inexpensive to fabricate and perform well under standard sunlight yielding open circuit photovoltage of 0.5 V, fill factor of 71%, electrical power density of 81 µW/cm2 and photocurrent density of 362 µA/cm2, over four orders of magnitude higher than any photosystem-based biophotovoltaic to date.

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