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. 2019 Jan 9;19(2):218. doi: 10.3390/s19020218

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Schematic diagram of an organic photoelectrochemical transistor (OPECT)-based biosensor for the DNA detection, and (b) the charge transfer between CdS quantum dots (QDs) and indium tin oxide (ITO) gate electrode under light illumination. (c) Channel current (I_ds) versus time at several repeated light on/off cycles with the immobilization of DNA. The concentration of the ssDNA probes is 1 × 10⁻¹⁵ M. (d) Dependence of ΔI/I on the concentration of ssDNA targets. Figure reproduced with permission from reference [51].