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A Bacterial Photosynthetic Enzymatic Unit Modulating Organic Transistors with Light

massimo trotta; Michele Di Lauro; Simona la Gatta; Carlo A. Bortolotti; Valerio Beni; Vitaliy Parkula; Sofia Drakopoulou; Martina Giordani; Marcello Berto; Francesco Milano; Tobias Cramer; Mauro Murgia; Angela Agostiano; Gianluca M. Farinola; Fabio Biscarini

The photochemical core of every photosynthetic apparatus is the reaction center, a transmembrane enzyme that converts photons into charge-separated states across the biological membrane with an almost unitary quantum yield. We present a light-driven organic transistor architecture, which converts light into electrical current by exploiting the efficiency of this biological machinery. Proper surface tailoring enables the integration of the bacterial reaction center as photoactive element in organic transistors, allowing the transduction of its photogenerated voltage into photomodulation of the output current up to two orders of magnitude. The device architecture, termed Light-driven Electrolyte-Gated Organic Transistor (LEGOT), is the prototype of a new generation of low-power hybrid bio-optoelectronic organic devices.

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