Protecting perovskites in space

NREL shows how lightweight barrier layers of silicon oxide can harden perovskite solar cells

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 US Department of Energy’s National Renewable Energy Laboratory (NREL).

Funded by the US 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.

As on Earth, perovskite solar cells need to have suitable durability. 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.

Kirmani said the silicon oxide layer could reduce the weight of conventional radiation barriers used for other solar cells by more than 99 perfect and serves as a first step toward designing lightweight and low-cost packaging for perovskites. The Illustration above shows the lightweight barrier layers of silicon oxide peeled back to reveal the protected perovskites underneath.

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.'

Exposure to a stream of low-energy protons caused unprotected perovskite solar cells to lose only about 15 percent 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 percent efficiency, while the unprotected cells showed significant degradation, from 19.4 percent to 10.8 percent. 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,” Kirmani 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 industrialisation. 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.