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. 2020 Apr 17;8:284. doi: 10.3389/fbioe.2020.00284

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Copyright © 2020 Ðerek, Rand, Migliaccio, Hanein and Głowacki.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Measuring time-resolved photocurrents of a floating optoelectronic stimulation device. (A) The split-architecture OEPC structure. Red arrows signify the current flow lines. (B) The measurement configuration showing the elastomer electrolyte-containment well on top of a split-OEPC device, with red LED light source in the background (C) current traces of a split-OEPC device under light excitation with sub-1 ms light pulses, 33 mW/cm² intensity. (D) Total charge, charge delivered during the positive and negative current phase, and time derivative of the total charge delivered for long light pulses (E) current traces of a split-OEPC device under light excitation with pulses longer than 1 ms. (F) A proposed model of a floating OEPC charge dynamics in darkness (green) and under light excitation (black).