Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Removing the lead hazard from perovskite solar cells

A transparent phosphate crystal, which incorporated into solar cells, can instantaneously immobilize the lead in case of failure and block its leaching out from the device.

CREDIT
Endre Horváth (EPFL)
A transparent phosphate crystal, which incorporated into solar cells, can instantaneously immobilize the lead in case of failure and block its leaching out from the device. CREDIT Endre Horváth (EPFL)

Abstract:
"The solar energy-to-electricity conversion of perovskite solar cells is unbelievably high, around 25%, which is now approaching the performance of the best silicon solar cells," says Professor László Forró at EPFL's School of Basic Sciences. "But their central element is lead, which is a poison; if the solar panel fails, it can wash out into the soil, get into the food chain, and cause serious diseases."

Removing the lead hazard from perovskite solar cells

Lausanne, Switzerland | Posted on July 16th, 2021

The problem is that in most of the halide perovskites lead can dissolve in water. This water solubility and solubility in other solvents is actually a great advantage, as it makes building perovskite solar panels simpler and inexpensive - another perk along with their performance. But the water solubility of lead can become a real environmental and health hazard when the panel breaks or gets wet, e.g. when it rains.

So the lead must be captured before it gets to the soil, and it must be possible to recycle it. This issue has drawn much and intensive research because it is the main obstacle for regulatory authorities approving the production of perovskite solar cells on a large, commercial scale. However, attempts to synthesize non-water-soluble and lead-free perovskites have yielded poor performance.

Now, Forró's group has come up with an elegant and efficient solution, which involves using a transparent phosphate salt, which does not block solar light, so it doesn't affect performance. And if the solar panel fails, the phosphate salt immediately reacts with lead to produce a water-insoluble compound that cannot leach out to the soil, and which can be recycled. The work is published in ACS Applied Materials & Interfaces.

"A few years ago, we discovered that cheap and transparent phosphate salt crystals, like those in soil fertilizers, can be incorporated into various parts of the sandwich-like lead halide perovskite devices, like photodetectors, LEDs or solar cells," says Endre Horváth, the study's first author. "These salts instantaneously react with lead ions in the presence of water, and precipitate them into extremely non-water-soluble lead phosphates."

"The 'fail-safe' chemistry keeps lead ions from leaching out and can render perovskite devices safer to use in the environment or close to humans," says Márton Kollár, the chemist behind the growth of perovskite crystals.

"We show that this approach can be used to build functional photodetectors, and we suggest that the broad community of researchers and R&D centers working on various devices like solar cells and light-emitting diodes implements it in their respective prototypes," adds Pavao Andričevic, who characterized the sensitive photodetectors.

Forró concludes: "This is an extremely important study - I would say, a central one - for large-scale commercialization of perovskite-based solar cells."

####

For more information, please click here

Contacts:
Nik Papageorgiou


@EPFL_en

Copyright © Ecole Polytechnique Fédérale de Lausanne

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Endre Horváth, Márton Kollár, Pavao Andričevic, Lidia Rossi, Xavier Mettan, László Forró. Fighting Health Hazards in Lead Halide Perovskite Optoelectronic Devices with Transparent Phosphate Salts. ACS Applied Materials & Interfaces 15 July 2021. DOI: 10.1021/acsami.0c21137:

Related News Press

News and information

Daikin Industries becomes OCSiAl shareholder July 27th, 2021

The National Space Society Congratulates Blue Origin and Jeff Bezos for the Spectacular First Crewed Flight of the New Shepard: Well-Tested Suborbital Tourist Rocket Soars to 63 Miles; Opens New Frontiers July 21st, 2021

Unconventional superconductor acts the part of a promising quantum computing platform: If it looks like a duck, swims like a duck and quacks like a duck, then it probably is a duck. July 16th, 2021

Unlocking efficient light-energy conversion with stable coordination nanosheets: Scientists design a high-performance, self-powered, UV photodetector using 2D nanosheets that show record photocurrent stability under air exposure July 16th, 2021

Display technology/LEDs/SS Lighting/OLEDs

Nanotech OLED electrode liberates 20% more light, could slash display power consumption: A five-nanometer-thick layer of silver and copper outperforms conventional indium tin oxide without adding cost June 29th, 2021

Pushing the boundaries of colloidal quantum dots by making their sizes equal: Scientists demonstrate the relationship between optoelectronic performance and size uniformity in perovskite colloidal quantum dots June 25th, 2021

Perovskites

Pushing the boundaries of colloidal quantum dots by making their sizes equal: Scientists demonstrate the relationship between optoelectronic performance and size uniformity in perovskite colloidal quantum dots June 25th, 2021

Researchers build structured, multi-part nanocrystals with super light-emitting properties May 28th, 2021

Polarization-sensitive photodetection using 2D/3D perovskite heterostructure crystal May 4th, 2021

Polarization-sensitive photodetection using 2D/3D perovskite heterostructure crystal May 4th, 2021

Discoveries

Repairs using light signals: FAU research group develops smart microparticle that identifies defective parts in electrical appliances July 16th, 2021

Scientists create rechargeable swimming microrobots using oil and water July 16th, 2021

Scientists take first snapshots of ultrafast switching in a quantum electronic device: They discover a short-lived state that could lead to faster and more energy-efficient computing devices July 16th, 2021

Researchers discover a new inorganic material with lowest thermal conductivity ever reported July 16th, 2021

Announcements

Daikin Industries becomes OCSiAl shareholder July 27th, 2021

The National Space Society Congratulates Blue Origin and Jeff Bezos for the Spectacular First Crewed Flight of the New Shepard: Well-Tested Suborbital Tourist Rocket Soars to 63 Miles; Opens New Frontiers July 21st, 2021

Scientists take first snapshots of ultrafast switching in a quantum electronic device: They discover a short-lived state that could lead to faster and more energy-efficient computing devices July 16th, 2021

Researchers discover a new inorganic material with lowest thermal conductivity ever reported July 16th, 2021

Energy

Researchers discover a new inorganic material with lowest thermal conductivity ever reported July 16th, 2021

Pushing the boundaries of colloidal quantum dots by making their sizes equal: Scientists demonstrate the relationship between optoelectronic performance and size uniformity in perovskite colloidal quantum dots June 25th, 2021

Light-harvesting nanoparticle catalysts show promise in quest for renewable carbon-based fuels June 25th, 2021

Changing a 2D material's symmetry can unlock its promise: Jian Shi Research Group engineers material into promising optoelectronic June 18th, 2021

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

The National Space Society Congratulates Blue Origin and Jeff Bezos for the Spectacular First Crewed Flight of the New Shepard: Well-Tested Suborbital Tourist Rocket Soars to 63 Miles; Opens New Frontiers July 21st, 2021

The virus trap: Hollow nano-objects made of DNA could trap viruses and render them harmless July 16th, 2021

Scientists create rechargeable swimming microrobots using oil and water July 16th, 2021

Stress-free path to stress-free metallic films paves the way for next-gen circuitry: Optimized sputtering technique helps minimize stress in tungsten thin films July 4th, 2021

Solar/Photovoltaic

Changing a 2D material's symmetry can unlock its promise: Jian Shi Research Group engineers material into promising optoelectronic June 18th, 2021

Molecular coating enhances organic solar cells June 11th, 2021

New form of silicon could enable next-gen electronic and energy devices: Novel crystalline form of silicon could potentially be used to create next-generation electronic and energy devices June 4th, 2021

Researchers build structured, multi-part nanocrystals with super light-emitting properties May 28th, 2021

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project