Prof. Carmeli Chanoch
|Affiliation:||Department Of Biochemistry, The George S.Wise faculty of life sciences
|Postal Address:||Department of Biochemistry|
The George S.Wise faculty of life sciences
Tel Aviv University
Tel Aviv 69978
Application of The Photosynthetic
Photovolteic devices are fabricated by assembling the highly efficient photosynthetic reaction center protein in solid state scaffolds. The assembly of the soft protein-made photosystem I (PS I) into a solid state scaffold without damaging the activity is very challenging therefore the robust chlorophyll-protein PS I reaction centerfrom cyanobacteria was selected. Induction of cysteine mutants in the outer loops of this membrane protein enabled fabrication of oriented self assembled monolayer by formation of sulfide bonds to metal electrodes as determined by AFM. In the biological membranes the efficient PS I generates light-induced vectorial charge transfer across nano size protein creating a potential of 1 V in 200 ns at quantum efficiency of 1 and energy conversion efficiency of 58%. It was found that the self assembled dry PS I retained its activity as it generated a reversible photovoltage of 1 V as measured by KPFM1,2. A photocurrent of 0.35A/cm2 was measured when the oriented self assembled monolayer of PS I on metal electrode was capsulated in a nitride micro cell and toped with the transparent indium tin oxide electrode. These photovoltaic devices are being used for development of cost effective solar cells. It can be applied in the development of bio-nano-photo-sensors, in artificial vision and as photo-switches in molecular electronics.
Light induced charge separation in protein-chlorophyll reaction center-PS I drives current in a solid state scaffold. The nano-particles are attached to bottom metal electrode inside a nano-cavity drilled in a Si3N4 layer. A conductive and transparent protective InSnO2 is sputtered on top.