Photoconductivity and current-voltage characteristics of thin DNA films: experiments and modeling

Ravindra Venkatramani; De Yu Zang; Choon Oh; James Grote; David Beratan

doi:10.1117/12.831024

20 August 2009 Photoconductivity and current-voltage characteristics of thin DNA films: experiments and modeling

Ravindra Venkatramani, De Yu Zang, Choon Oh, James Grote, David Beratan

Author Affiliations +

Proceedings Volume 7403, Nanobiosystems: Processing, Characterization, and Applications II; 74030B (2009) https://doi.org/10.1117/12.831024
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

We report experimental observations and theoretical modeling of an unusual photoelectric effect in deoxyribonucleic acid (DNA) thin-film devices, under visible and near-infrared illumination. The devices also show diode-type rectifying current-voltage (I-V) characteristics. An equivalent circuit model was constructed that fits the experimental data, and physical processes likely to arise in the devices are discussed. We envisage the formation of a Schottky barrier at the DNA film-metal interface and infer that the photoresponse arises from photoinjection of electrons from the metal into the DNA film.

Citation Download Citation

Ravindra Venkatramani, De Yu Zang, Choon Oh, James Grote, and David Beratan "Photoconductivity and current-voltage characteristics of thin DNA films: experiments and modeling", Proc. SPIE 7403, Nanobiosystems: Processing, Characterization, and Applications II, 74030B (20 August 2009); https://doi.org/10.1117/12.831024

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