Anais do Workshop INEO 2023

PASSIVATION OF PERSISTENT CONDUCTIVITY FROM ULTRAVIOLET RADIATION IN ZINC OXIDE FILMS

Published in 12/12/2023 - ISBN: 978-65-272-0088-8

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Paper Title
PASSIVATION OF PERSISTENT CONDUCTIVITY FROM ULTRAVIOLET RADIATION IN ZINC OXIDE FILMS
Authors
  • Mayk Rodrigues Do Nascimento (DR); FCT - UNESP
  • Douglas Henrique Vieira
  • Gabriel L. Nogueira
  • Luis Henrique Tigre Bertoldo
  • Neri Alves
Modality
Pôster
Subject area
Dispositivos eletrônicos e ópticos (OLED/OFET/OPVs/etc.)
Publishing Date
12/12/2023
Country of Publishing
Brasil
Language of Publishing
Inglês
Paper Page
https://www.even3.com.br/anais/workshop-do-ineo-2023/613446-passivation-of-persistent-conductivity-from-ultraviolet-radiation-in-zinc-oxide-films
ISBN
978-65-272-0088-8
Keywords
Persistent conductivity, ZnO, UV, Humidity
Summary
Printed electronics have shown excellent potential for developing sensors that can be incorporated into wearable devices, intelligent labels and packaging. Zinc oxide (ZnO) films, obtained from organic precursor solution or by printing nanoparticle dispersion, have been widely studied for their ability to sense ultraviolet radiation (UV), gas and vapors. When ZnO is exposed to UV, it can introduce what is known as persistent conductivity, in other words, the conductivity increase remains even after radiation has ceased. In this work, we present the development of photoresistors and photodiodes based on sprayed ZnO active layer in which is to investigate how the persistent conductivity effect relates with the humidity. All measurements were conducted in an environment with controlled relative humidity (RH).The photoresistor used aluminum coplanar electrodes and the photodiode architecture comprised aluminum bottom electrode and PEDOT:PSS top electrode, sandwiching the ZnO layer. Both devices were applied as UV-assisted humidity sensors to investigate the passivation of persistent conductivity. From measurements of visible-ultraviolet (Uv-Vis) spectra for the ZnO films, a maximum absorption was observed at 355 nm. The current versus time measurement showed that with RH of 17 %, the response time (tres) and the recovery time (trec) were 67.7 and 124.9 s, respectively. When the UR was increased to 87 %, these times decreased to 11.6 and 21.1 s. In the measurement of current versus voltage, the photoresistor showed high sensitivity, reaching 6.6 ×10^3 when exposed to high humidity. The photodiode showed rectification of four times in a dry chamber, but it increased to 34 times when humidity was increased, whereas a more significant increase was observed in reverse polarization. This work demonstrated that the exposure of ZnO to high RH is a way to reduce the effects of persistent conductivity after UV exposition. Furthermore, the parameters of the photoresistor and photodiode showed improvement when measurements were made in high RH.
Title of the Event
Workshop do INEO 2023
City of the Event
Nazaré Paulista
Title of the Proceedings of the event
Anais do Workshop INEO 2023
Name of the Publisher
Even3
Means of Dissemination
Meio Digital

How to cite

UNESP, Mayk Rodrigues Do Nascimento (DR); FCT - et al.. PASSIVATION OF PERSISTENT CONDUCTIVITY FROM ULTRAVIOLET RADIATION IN ZINC OXIDE FILMS.. In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/613446-PASSIVATION-OF-PERSISTENT-CONDUCTIVITY-FROM-ULTRAVIOLET-RADIATION-IN-ZINC-OXIDE-FILMS. Access in: 06/10/2024

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