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Open AccessFeature PaperArticle

Bio-Phototransistors with Immobilized Photosynthetic Proteins

1
Department of Electrical Engineering, University of South Florida (USF), Tampa, FL 33620, USA
2
Quidel Corporation Headquarters, 9975 Summers Ridge Rd, San Diego, CA 92121, USA
3
Department of Microbiology and Immunology, University of British Columbia (UBC), Vancouver, BC V6T 1Z3, Canada
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(10), 1709; https://doi.org/10.3390/electronics9101709
Received: 26 September 2020 / Revised: 12 October 2020 / Accepted: 15 October 2020 / Published: 18 October 2020
(This article belongs to the Special Issue Ultrasensitive Photodetectors and Applications)
The efficient mechanism of light capture by photosynthetic proteins allows for energy transfer and conversion to electrochemical energy at very low light intensities. In this work, reaction center (RC) proteins, or a core complex consisting of the RC encircled by light harvesting (LH1) proteins (RC-LH1) from photosynthetic bacteria, were immobilized on an insulating layer of an ion-sensitive field-effect transistor (ISFET) to build bio-photodetectors. The orientation of the RC proteins was controlled via application of a hybrid linker made of 10-carboxydecylphosphonic acid and cytochrome c that anchored the RCs to their electron donor side. Bio-phototransistors consisting of either the core RC or the RC-LH1 core complex were tested under white and monochromic light. The difference between the dark and light currents at different wavelengths are well-matched with the absorption spectrum of the photosynthetic proteins. The results show potential for the use of photosynthetic proteins in photodetectors. View Full-Text
Keywords: bio-phototransistor; reaction center; rhodobacter sphaeroides bio-phototransistor; reaction center; rhodobacter sphaeroides
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Takshi, A.; Yaghoubi, H.; Jun, D.; Beatty, J.T. Bio-Phototransistors with Immobilized Photosynthetic Proteins. Electronics 2020, 9, 1709.

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