Humidity effect on photoelectrical properties of photosensitive field effect transistors

Kunlong Yang, Sijian Yuan, Zhijun Qiu, Yiqiang Zhan, Ali Umar Akrajas, Lirong Zheng, Fernando Seoane

Research output: Contribution to journalArticle

Abstract

Environmental influences are critical for the reliability of photoelectric devices, especially those using organic semiconductors. Among all the influence factors, the effect of relative humidity on the material's photoelectrical properties receives less attentions. To date, reported humidity effects are mostly related to the electrical properties. Their impact to the photoelectrical characteristics has rarely been investigated. In this work, we firstly report a detailed study on the dependency of material's photoelectrical properties on the relative humidity in photosensitive field effect transistors. It was found that both the amplitude and the decay time of the photocurrent indicated a profound dependency on the humidity. To further clarify the mechanism, experiments were carefully designed along with a simulation to recognize and to provide a detailed understanding on any possible influence factors in these processes. The results indicate a prominent co-existence of carrier-trapping and dielectric-polarization phenomena in the photoelectric device under the influences of humidity. Since the water molecules in the atmosphere are predominant, the observed variation in the photoelectrical properties can be explained.

Original languageEnglish
Pages (from-to)42-47
Number of pages6
JournalOrganic Electronics: physics, materials, applications
Volume69
DOIs
Publication statusPublished - 1 Jun 2019
Externally publishedYes

Fingerprint

Phototransistors
Field effect transistors
humidity
Atmospheric humidity
field effect transistors
Photoelectric devices
Materials properties
dielectric polarization
Semiconducting organic compounds
organic semiconductors
Photocurrents
photocurrents
Electric properties
trapping
electrical properties
Polarization
atmospheres
Molecules
Water
decay

Keywords

  • Humidity
  • Photocurrent decay
  • Polarization
  • Trapping

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Humidity effect on photoelectrical properties of photosensitive field effect transistors. / Yang, Kunlong; Yuan, Sijian; Qiu, Zhijun; Zhan, Yiqiang; Akrajas, Ali Umar; Zheng, Lirong; Seoane, Fernando.

In: Organic Electronics: physics, materials, applications, Vol. 69, 01.06.2019, p. 42-47.

Research output: Contribution to journalArticle

Yang, Kunlong ; Yuan, Sijian ; Qiu, Zhijun ; Zhan, Yiqiang ; Akrajas, Ali Umar ; Zheng, Lirong ; Seoane, Fernando. / Humidity effect on photoelectrical properties of photosensitive field effect transistors. In: Organic Electronics: physics, materials, applications. 2019 ; Vol. 69. pp. 42-47.
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