Publication detail

Understanding Photocapacitive and Photofaradaic Processes in Organic Semiconductor Photoelectrodes for Optobioelectronics

GLOWACKI, E.

Original Title

Understanding Photocapacitive and Photofaradaic Processes in Organic Semiconductor Photoelectrodes for Optobioelectronics

Type

journal article in Web of Science

Language

English

Original Abstract

Photoactive organic semiconductor substrates are envisioned as a novel class of bioelectronic devices that transduce light into stimulating biological signals with relevance for retinal implants or guided cellular differentiation. The direct interface between the semiconductor and the electrolyte gives rise to different competing optoelectronic transduction mechanisms. A detailed understanding of such faradaic or capacitive processes and the underlying material science is necessary to develop and optimize future devices. Here, the problem in organic photoelectrodes is addressed based on a planar p-n junction containing phthalocyanine (H2Pc) and N,N '-dimethyl perylenetetracarboxylic diimide (PTCDI). The detailed characterization of photoelectrochemical current transients is combined with spectroscopic measurements, impedance spectroscopy, and local photovoltage measurements to establish a model that predicts quantitatively faradaic or capacitive current transients. The decisive elements of the model are the energy levels present at the interface and the voltage building up in the photoelectrode. The result of the efforts is a comprehensive model of photocapacitive and photofaradaic effects that can be applied to developing wireless bioelectronic photostimulation devices.

Keywords

bioelectronics; organic semiconductors; photoelectrodes; photostimulation; semiconductor‐ electrolyte interfaces

Authors

GLOWACKI, E.

Released

15. 2. 2021

Publisher

WILEY-V C H VERLAG GMBH

Location

WEINHEIM

ISBN

1616-301X

Periodical

ADVANCED FUNCTIONAL MATERIALS

Year of study

31

Number

16

State

Federal Republic of Germany

Pages from

1

Pages to

10

Pages count

10

URL

https://onlinelibrary.wiley.com/doi/epdf/10.1002/adfm.202010116

BibTex

@article{BUT171364,
  author="Eric Daniel {Glowacki}",
  title="Understanding Photocapacitive and Photofaradaic Processes in Organic Semiconductor Photoelectrodes for Optobioelectronics",
  journal="ADVANCED FUNCTIONAL MATERIALS",
  year="2021",
  volume="31",
  number="16",
  pages="1--10",
  doi="10.1002/adfm.202010116",
  issn="1616-301X",
  url="https://onlinelibrary.wiley.com/doi/epdf/10.1002/adfm.202010116"
}