Publication detail

How to Achieve High Spatial Resolution in Organic Optobioelectronic Devices?

FABBRI, L. MIGLIACCIO, L. ŠIRVINSKYTĖ, A. RIZZI, G. BONDI, L. TAMAROZZI, C. WEBER, S. FRABONI, B. GLOWACKI, E. CRAMER, T.

Original Title

How to Achieve High Spatial Resolution in Organic Optobioelectronic Devices?

Type

journal article in Web of Science

Language

English

Original Abstract

Light activated local stimulation and sensing of biological cells hold great promise for minimally invasive bioelectronic interfaces. Organic semiconductors are particularly appealing for these applications due to their optoelectronic properties and biocompatibility. This study examines the material properties necessary to localize the optical excitation and achieve optoelectronic transduction with high spatial resolution. Using photovoltage and photocurrent microscopy, we investigate spatial broadening of local optical excitation in Phthalocyanine/3,4,9,10-Perylenetetracarboxylic diimide (H2PC/PTCDI) planar heterojunctions. Our measurements reveal that resolution losses are tied to the effective diffusion length of charge carriers at the heterojunction. For the H2PC/PTCDI heterojunction, the diffusion length is determined to be lambda d = 1.5 +/- 0.1 mu m, attributed to reduced carrier mobility. Covering the heterojunction with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) improves the charge generation performance but increases the carrier diffusion length to lambda d = 7.0 +/- 0.3 mu m due to longer lifetime and higher carrier mobility. These findings elucidate the physical mechanisms underlying transduction and provide design principles for organic semiconductor devices aimed at achieving high efficiency and high spatial resolution for wireless and optically activated bioelectronics.

Keywords

optobioelectronics; organic heterojunctions; photocapacitors; photocurrent microscopy; photovoltage; spatial resolution

Authors

FABBRI, L.; MIGLIACCIO, L.; ŠIRVINSKYTĖ, A.; RIZZI, G.; BONDI, L.; TAMAROZZI, C.; WEBER, S.; FRABONI, B.; GLOWACKI, E.; CRAMER, T.

Released

1. 5. 2025

Publisher

WILEY

Location

HOBOKEN

ISBN

2196-7350

Periodical

Advanced Materials Interfaces

Year of study

12

Number

9

State

Federal Republic of Germany

Pages from

1

Pages to

9

Pages count

9

URL

https://advanced.onlinelibrary.wiley.com/doi/10.1002/admi.202400822

Full text in the Digital Library

http://hdl.handle.net/11012/250922

BibTex

@article{BUT197816,
  author="Luca {Fabbri} and Ludovico {Migliaccio} and Aleksandra {Širvinskytė} and Giacomo {Rizzi} and Luca {Bondi} and Cristiano {Tamarozzi} and Stefan A.L. {Weber} and Beatrice {Fraboni} and Eric Daniel {Glowacki} and Tobias {Cramer}",
  title="How to Achieve High Spatial Resolution in Organic Optobioelectronic Devices?",
  journal="Advanced Materials Interfaces",
  year="2025",
  volume="12",
  number="9",
  pages="1--9",
  doi="10.1002/admi.202400822",
  issn="2196-7350",
  url="https://advanced.onlinelibrary.wiley.com/doi/10.1002/admi.202400822"
}