Researchers at the lab of Anders Hagfeldt at EPFL, working with colleagues at the lab of Michael Grätzel, brought real-world conditions into the controlled environment of the lab. Using data from a weather station near Lausanne (Switzerland), they reproduced the real-world temperature and irradiance profiles from specific days during the course of the year, to test PSCs in real-world conditions.

PSCs tested for real world conditions in the lab image

With this approach, the scientists were able to quantify the energy yield of the devices under realistic conditions. “This is what ultimately counts for the real-world application of solar cells," says Dr. Wolfgang Tress from EPFL.

The study showed that the temperature and irradiance variations do not affect the performance of perovskite solar cells in any dramatic way, and although the efficiency of the cells decreases slightly during the course of a day, it recovers during the night.

“The study provides a further step towards the assessment of the performance and reliability of perovskite solar cells under realistic operation conditions,” says Tress.