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At Phys.org: New breakthrough pushes perovskite cell to greater stability, efficiency


Researchers at the U.S. Department of Energy’s (DOE’s) National Renewable Energy Laboratory (NREL) have made a technological breakthrough and constructed a perovskite solar cell with the dual benefits of being both highly efficient and highly stable.

NREL-led breakthrough pushes perovskite cell to greater stability, efficiency
The inverted architecture of this perovskite solar cell, coupled with surface engineering, enabled researchers to improve efficiency and stability. Credit: NREL

The work was done in collaboration with scientists from the University of Toledo, the University of Colorado-Boulder, and the University of California-San Diego.

A unique architectural structure enabled the researchers to record a certified stabilized efficiency of 24% under 1-sun illumination, making it the highest reported of its kind. The highly efficient cell also retained 87% of its original efficiency after 2,400 hours of operation at 55 degrees Celsius.

Perovskite, which refers to a crystalline structure, has emerged in the last decade as an impressive means to efficiently capture sunlight and convert it to electricity. Research into perovskite solar cells has been focused to a large degree on how to increase their stability.

“Some people can demonstrate perovskites with high stability, but efficiency is lower,” said Zhu, a senior scientist in the Chemistry and Nanoscience Center at NREL. “You ought to have high efficiency and high stability simultaneously. That’s challenging.”

The researchers used an inverted architecture, rather than the “normal” architecture that has to date yielded the highest efficiencies. The difference between the two types is defined by how the layers are deposited on the glass substrate. The inverted perovskite architecture is known for its high stability and integration into tandem solar cells.

 The NREL-led team also added a new molecule, 3-(Aminomethyl) pyridine (3-APy), to the surface of the perovskite. The molecule reacted to the formamidinium within the perovskite to create an electric field on the surface of the perovskite layer.

“That suddenly gave us a huge boost of not only efficiency but also stability,” Zhu said.

The scientists reported the 3-APy reactive surface engineering can improve the efficiency of an inverted cell from less than 23% to greater than 25%. They also noted the reactive surface engineering stands out as an effective approach to significantly enhance the performance of inverted cells “to new state-of-the-art levels of efficiency and operational reliability.”


One of the examples of “prior environmental fitness” that Michael Denton noted in his book, The Miracle of Man, is that the Earth’s crust contains accessible amounts of exotic materials that have found unique applications in our technological advancements.

Man's ability to craft metal and make pottery, for example, are gifts from God. From the first automobile with a gasoline engine to the first manned and powered airplane flight, man looked around in nature and used those resources to build and create. One problem mentioned with solar cells is that they stop working when the sun is not shining. However, advanced storage batteries are becoming available. https://www.renewableenergyworld.com/solar/10-notable-battery-storage-projects-that-went-live-in-2021/#gref relatd

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