• HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
Saturday, August 2, 2025
BIOENGINEER.ORG
No Result
View All Result
  • Login
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
No Result
View All Result
Bioengineer.org
No Result
View All Result
Home NEWS Science News Science

Water creates traps in organic electronics

Bioengineer by Bioengineer
April 29, 2019
in Science
Reading Time: 3 mins read
0
Share on FacebookShare on TwitterShare on LinkedinShare on RedditShare on Telegram

General rule for the energy of water-induced traps in organic semicondutors

IMAGE

Credit: Charlotte Perhammar

Poor-quality organic semiconductors can become high-quality semiconductors when manufactured in the correct way. Researchers at Linköping University show in an article in Nature Materials that the motion of charges in organic electronic devices is dramatically slowed down by minute amounts of water.

The discovery that organic materials, such as polymers, can act as semiconductors led to a Nobel Prize in Chemistry in 2000. Since then, research within organic electronics has truly exploded, not least at Linköping University, which is home to world-leading research in the field.

Organic semiconductors, however, do not conduct current as efficiently as, for example, semiconductors of silicon or other inorganic materials. The scientists have discovered that one of the causes of this is the formation of traps in the organic materials in which the charge carriers get stuck. Several research groups around the world have been working hard to understand not only where the traps are located, but also how they can be eliminated.

“There are traps in all organic semiconductors, but they are probably a greater problem in n-type materials, since these are generally poorer semiconductors than p-type materials”, says Martijn Kemerink, professor of applied physics in the Division for Complex Materials and Devices at Linköping University.

Materials of p-type have a positive charge and the charge carriers consist of holes, while materials of n-type have charge carriers in the form of electrons, which gives the material a negative charge.

Martijn Kemerink and his colleagues at Linköping University have concluded that water is the villain in the piece. Specifically, the water is thought to sit in nanometre-sized pores in the organic material and is absorbed from the environment.

“In a p-type material the dipoles in the water align with their negative ends towards the holes, which are positively charged, and the energy of the complete system is lowered. You could say that the dipoles embed the charge carriers such that they cannot go anywhere anymore”, says Martijn Kemerink.

For n-type materials, the water orients the other way around, but the effect is the same, the charge is trapped.

Experiments have been carried out in which the material is heated, to dry it out and cause the water to disappear. It works fine for a while, but the material subsequently re-absorbs water from the surrounding air, and much of the benefit gained by drying disappears.

“The more water, the more traps. We have also shown that the drier the films can be manufactured, the better conductors they are. The theoretical work by Mathieu Linares quantitatively confirmed our ideas about what was going on, which was very satisfactory. Our article in Nature Materials shows not only how to get the water out, but also how to make sure that the water stays out, in order to produce an organic material with stable conductivity.”

In order to prevent the reuptake of water into the material once it has been dried, the scientists have also developed a way to remove the voids into which water molecules otherwise would have penetrated. This method is based on a combination of heating the material in the presence of a suitable organic solvent.

“Materials that were previously believed to be extremely poor semiconductors can instead become good semiconductors, as long as they are manufactured in a dry atmosphere. We have shown that dry-prepared materials tend to remain dry, while materials that are made in the presence of water can be dried. The latter are, however, extremely sensitive to water. This is true of the materials we have tested, but there’s nothing to suggest that other organic semiconducting materials behave differently”, says Martijn Kemerink.

###

General Rule for the Energy of Water-Induced Traps in Organic Semicondutors. Guangzheng Zuo, Mathieu Linares, Tanvi Upreti and Martijn Kemerink, Linköping University, Nature Materials 2019 DOI 10.1038/s41563-019-0347-y

Media Contact
Martijn Kemerink
[email protected]

Original Source

https://liu.se/en/news-item/fukt-skapar-fallor-i-den-organiska-elektroniken

Related Journal Article

http://dx.doi.org/10.1038/s41563-019-0347-y

Tags: Chemistry/Physics/Materials SciencesElectrical Engineering/ElectronicsMaterialsPolymer ChemistrySuperconductors/Semiconductors
Share12Tweet8Share2ShareShareShare2

Related Posts

Five or more hours of smartphone usage per day may increase obesity

July 25, 2019
IMAGE

NASA’s terra satellite finds tropical storm 07W’s strength on the side

July 25, 2019

NASA finds one burst of energy in weakening Depression Dalila

July 25, 2019

Researcher’s innovative flood mapping helps water and emergency management officials

July 25, 2019
Please login to join discussion

POPULAR NEWS

  • Blind to the Burn

    Overlooked Dangers: Debunking Common Myths About Skin Cancer Risk in the U.S.

    60 shares
    Share 24 Tweet 15
  • Dr. Miriam Merad Honored with French Knighthood for Groundbreaking Contributions to Science and Medicine

    46 shares
    Share 18 Tweet 12
  • Neuropsychiatric Risks Linked to COVID-19 Revealed

    40 shares
    Share 16 Tweet 10
  • Study Reveals Beta-HPV Directly Causes Skin Cancer in Immunocompromised Individuals

    38 shares
    Share 15 Tweet 10

About

BIOENGINEER.ORG

We bring you the latest biotechnology news from best research centers and universities around the world. Check our website.

Follow us

Recent News

Predicting Lung Infections After Brain Hemorrhage

Impact of Morphology and Location on Aneurysms

Unraveling EMT’s Role in Colorectal Cancer Spread

  • Contact Us

Bioengineer.org © Copyright 2023 All Rights Reserved.

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In
No Result
View All Result
  • Homepages
    • Home Page 1
    • Home Page 2
  • News
  • National
  • Business
  • Health
  • Lifestyle
  • Science

Bioengineer.org © Copyright 2023 All Rights Reserved.