The DoE's Quest to Improve Solar Cells: Page 2 of 2

this means that we have to spend a lot of time verifying our measurements and optimizing various parameters," Doughty said. "This includes spatially overlapping the two lasers to the same spot, on the order of a few hundred nanometers, and making sure they arrive at the sample within a few femtoseconds of each other."

Another challenge for researchers is to understand what causes the observed spatial difference, which they are trying to solve by exploring an all-optical imaging approach that would allow them to correlate electronic dynamics with underlying structural information. This approach also could help them map and understand perovskite degradation issues associated with moisture, which must be resolved before solar cells created on these type of materials can be commercially viable, they said.

Elizabeth Montalbano is a freelance writer who has written about technology and culture for more than 15 years. She has lived and worked as a professional journalist in Phoenix, San Francisco, and New York City. In her free time she enjoys surfing, traveling, music, yoga, and cooking. She currently resides in a village on the southwest coast of Portugal.

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