Connect with us

Hi, what are you looking for?

Illustration shows the lightweight barrier layers of silicon oxide peeled back to reveal the protected perovskites underneath. Image by Ahmad Kirmani, NREL

Clean Power

Thin, Lightweight Layer Provides Radiation Barrier for Perovskites in Space, Protection From Elements on Earth

An ultrathin protective coating proves sufficient to protect a perovskite solar cell from the harmful effects of space and harden it against environmental factors on Earth, according to newly published research from the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL).

Funded by the U.S. Department of Defense’s Operational Energy Capability Improvement Fund (OECIF), the NREL research was done for the Air Force Research Laboratory (AFRL) to develop low-cost innovative energy sources for powering the armed forces worldwide.

The research is the latest effort to determine the effectiveness of perovskites for use in space applications, where it would be exposed to protons, alpha particles, atomic oxygen, and other stressors. The ability to use perovskites to generate power in space is enticing because they offer a lower-cost and lightweight option to other technologies with the potential for achieving efficiencies similar to those of current space PV technologies.

Just as on Earth, perovskite solar cells need to have suitable durability. However, the environment in space is significantly different. While the biggest challenges on Earth are related to weather, in space perovskites must address the problems that come from radiation bombardment and extreme temperature swings. Perovskites show signs of better tolerance to radiation than many other solar cells, but plenty of testing remains to be conducted.

Researchers last year ran simulations to demonstrate how exposure to radiation in space would affect perovskites. They determined the next-generation technology would work in space but pointed out the need to encapsulate the cell in some way to provide added protection.

In the follow-up research, Ahmad Kirmani, lead author of the latest Nature Energy paper, said simulations demonstrated a micron-thick layer of silicon oxide would preserve the efficiency and increase the lifetime of perovskite solar cells in space. As a comparison, the micron-thick layer is about 100 times thinner than a typical human hair.

Kirmani said the silicon oxide layer could reduce the weight of conventional radiation barriers used for other solar cells by more than 99% and serves as a first step toward designing lightweight and low-cost packaging for perovskites.

High-energy protons travel through perovskite solar cells without causing much harm. Low-energy protons, however, are more abundant in space and wreak more havoc on perovskite cells by knocking atoms out of place and causing efficiency levels to steadily decline. The lower energy protons interact with matter much more readily and the addition of the silicon oxide layer protected the perovskite from damage even from the low-energy protons.

“We thought it would be impossible for the silicon oxide to provide protection against fully penetrating long-range particles such as the high-energy protons and alpha particles,” Kirmani said. “However, the oxide layer turned out to be a surprisingly good barrier against those as well.”

The results are detailed in the paper “Metal oxide barrier layers for terrestrial and space perovskite photovoltaics.” The co-authors are David Ostrowski, Kaitlyn VanSant, Rosemary Bramante, Karen Heinselman, Jinhui Tong, Bart Stevens, William Nemeth, Kai Zhu, and Joseph Luther, from NREL; and several key collaborators who work with the team from the University of North Texas and the University of Oklahoma. VanSant holds the unique position of being a postdoctoral researcher at NASA who conducts research at NREL.

Exposure to a stream of low-energy protons caused unprotected perovskite solar cells to lose only about 15% of their initial efficiency, the researchers found. A larger concentration of particles destroyed the cells, while the protected perovskites demonstrated what the scientists described as “a remarkable resilience.” With the simple barrier, the cells showed no damage.

In addition to making the cells more resilient in space, the researchers also tested how the barrier could provide benefit in more conventional applications. They then exposed the perovskite solar cells to an uncontrolled moisture and temperature environment for several days to mimic storage conditions. The protected cells retained their initial 19% efficiency, while the unprotected cells showed significant degradation, from 19.4% to 10.8%. The oxide layer also provided protection when other perovskite compositions typically more sensitive to moisture were exposed to water.

Further, the perovskite solar cells were subjected to a test chamber where they were bombarded with ultraviolet photons similar to the environment at low-Earth orbit. The photons interacted with oxygen to create atomic oxygen. The unprotected cells were destroyed after eight minutes. The protected cells retained their initial efficiency after 20 minutes and only had a slight drop after 30 minutes.

The simulations and experiments revealed that by reducing the damage from radiation, the lifetime of the protected solar cells used in Earth’s orbits and deep space would be increased from months to years.

“Power conversion efficiency and operational stability of perovskite solar cells have been the two primary focus areas for the community so far,” he said. “We have made a lot of progress and I think we have come far to the point that we might be pretty close to hitting those targets needed for industrialization. However, to really enable this market entry, packaging is the next target.”

Because perovskite solar cells can be deposited onto a flexible substrate, the emerging technology, coupled with the protective layer of silicon oxide, allows its use for various terrestrial applications such as powering drones.

NREL is the U.S. Department of Energy’s primary national laboratory for renewable energy and energy efficiency research and development. NREL is operated for DOE by the Alliance for Sustainable Energy LLC.

Courtesy of NREL


Scientists Decide How To Prove Out Perovskite Panels for Space Power

Sign up for daily news updates from CleanTechnica on email. Or follow us on Google News!

Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.

Autonomous Drones for Better Farming

I don't like paywalls. You don't like paywalls. Who likes paywalls? Here at CleanTechnica, we implemented a limited paywall for a while, but it always felt wrong — and it was always tough to decide what we should put behind there. In theory, your most exclusive and best content goes behind a paywall. But then fewer people read it! We just don't like paywalls, and so we've decided to ditch ours. Unfortunately, the media business is still a tough, cut-throat business with tiny margins. It's a never-ending Olympic challenge to stay above water or even perhaps — gasp — grow. So ...
If you like what we do and want to support us, please chip in a bit monthly via PayPal or Patreon to help our team do what we do! Thank you!

The mission of the U.S. Energy Department is to ensure America’s security and prosperity by addressing its energy, environmental and nuclear challenges through transformative science and technology solutions. Learn more.


You May Also Like

Autonomous Vehicles

NREL Inaugurates New Lab, Advancing Pioneering Research Efforts Into the Real World To Improve Mobility Efficiency and Equity Billions of devices around the world...

Clean Power

Lesser Known Than Some of Its Renewable Energy Cousins, Geothermal Energy Is Now on the Rise Thanks to Its Ability To Provide 24/7 Power,...

Clean Power

In October 2021, the city of Frankfort, Kentucky, set a very accelerated and ambitious clean energy goal: to supply 100% clean, renewable electricity to...

Air Quality

Kids are sponges when it comes to learning about renewable energy, and hands-on, experiential activities are fun ways to make zero emissions living tangible.

Copyright © 2023 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.