• HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
Monday, October 6, 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 Chemistry

Efficient, ‘green’ quantum-dot solar cells exploit defects

Bioengineer by Bioengineer
May 18, 2020
in Chemistry
Reading Time: 3 mins read
0
IMAGE
Share on FacebookShare on TwitterShare on LinkedinShare on RedditShare on Telegram

Quantum-dot approach shows promise for a new type of toxic-element-free, inexpensive, defect-tolerant solar cells

IMAGE

Credit: Los Alamos National Laboratory

Novel quantum dot solar cells developed at Los Alamos National Laboratory match the efficiency of existing quantum-dot based devices, but without lead or other toxic elements that most solar cells of this type rely on.

“This quantum-dot approach shows great promise for a new type of toxic-element-free, inexpensive solar cells that exhibit remarkable defect tolerance,” said Victor Klimov, a physicist specializing in semiconductor nanocrystals at Los Alamos and lead author of the report featured on the cover of the journal Nature Energy.

Not only did the researchers demonstrate highly efficient devices, they also revealed the mechanism underlying their remarkable defect tolerance. Instead of impeding photovoltaic performance, the defect states in copper indium selenide quantum dots actually assist the photoconversion process.

Quantum dots have already found many uses, and more are coming. In particular, they are very efficient light emitters. They are distinct from other types of light-emitting materials, as their color is not fixed and can be easily tuned by adjusting the quantum dot size. This property has been utilized in displays and televisions, and soon will help make more efficient, color-adjustable light bulbs.

The unique physics of nanosized semiconductor crystals prepared by colloidal synthesis has fascinated scientists for decades. Due to their extremely small sizes – a few nanometers across – the properties of the nanocrystals can be manipulated at the most fundamental quantum-mechanical level. Hence, they are called “quantum dots.”

Size tunable properties of quantum dots can also help efficiently capture sunlight, which is of great use in solar-energy conversion. The efficiencies of modern quantum dot solar cells rapidly approach those of traditional thin-film photovoltaics. However, in most cases they contain highly toxic heavy metals such as lead and cadmium, which limits their practical utility.

Los Alamos researchers described new, high-efficiency quantum dot solar cells that were free of any toxic elements. The team used a reaction of copper, indium, and selenium, with the addition of zinc to make zinc-doped quantum dots. The dots were incorporated into voids of a highly porous titania film which served as a charge collecting electrode.

Incident solar photons were absorbed by the quantum dots, which resulted in the release of tightly bound electrons into a high-mobility conduction band. These electrons were then transferred to the titania electrode which ultimately produced a photocurrent.

“We were pleasantly surprised by the results of the measurements of our devices,” Klimov said. “Due to their very complex composition (four elements are combined in the same nanosized particle), these dots are prone to defects. Despite these imperfections, they showed nearly perfect performance in our solar cells–per each 100 absorbed photons we detected 85 photogenerated electrons, implying that the photon-to-electron conversion efficiency was 85 percent.”

The high photoconversion efficiencies combined with the remarkable defect tolerance and toxic-element-free composition make these quantum dots very promising materials for implementing inexpensive, readily scalable and potentially disposable solar cells.

###

About Los Alamos National Laboratory

Los Alamos National Laboratory, a multidisciplinary research institution engaged in strategic science on behalf of national security, is operated by Triad, a public service oriented, national security science organization equally owned by its three founding members: Battelle Memorial Institute (Battelle), the Texas A&M University System (TAMUS), and the Regents of the University of California (UC) for the Department of Energy’s National Nuclear Security Administration.

Los Alamos enhances national security by ensuring the safety and reliability of the U.S. nuclear stockpile, developing technologies to reduce threats from weapons of mass destruction, and solving problems related to energy, environment, infrastructure, health, and global security concerns.

Media Contact
James Riordon
[email protected]

Related Journal Article

http://dx.doi.org/10.1038/s41560-020-0617-6

Tags: Chemistry/Physics/Materials SciencesClimate ChangeEnergy SourcesEnvironmental HealthIndustrial Engineering/ChemistryMaterialsResearch/DevelopmentSuperconductors/SemiconductorsTechnology/Engineering/Computer Science
Share12Tweet8Share2ShareShareShare2

Related Posts

blank

Selective Arylating Uncommon C–F Bonds in Polyfluoroarenes

October 4, 2025
Building Larger Hydrocarbons for Optical Cycling

Building Larger Hydrocarbons for Optical Cycling

October 4, 2025

Scientists Discover How Enzymes “Dance” During Their Work—and Why It Matters

October 4, 2025

Electron Donor–Acceptor Complexes Enable Asymmetric Photocatalysis

October 4, 2025
Please login to join discussion

POPULAR NEWS

  • New Study Reveals the Science Behind Exercise and Weight Loss

    New Study Reveals the Science Behind Exercise and Weight Loss

    95 shares
    Share 38 Tweet 24
  • New Study Indicates Children’s Risk of Long COVID Could Double Following a Second Infection – The Lancet Infectious Diseases

    93 shares
    Share 37 Tweet 23
  • New Insights Suggest ALS May Be an Autoimmune Disease

    71 shares
    Share 28 Tweet 18
  • Physicists Develop Visible Time Crystal for the First Time

    75 shares
    Share 30 Tweet 19

About

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

Follow us

Recent News

CARMA3: Key Regulator Preventing Hypertrophic Cardiomyopathy

Can Targeting Inflammation Alleviate Fatigue in Early-Stage Breast Cancer Patients?

Advancing Health Recommender Systems: A New Nursing Framework

Subscribe to Blog via Email

Success! An email was just sent to confirm your subscription. Please find the email now and click 'Confirm' to start subscribing.

Join 63 other subscribers
  • 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.