Like other solar cells, commercial perovskite solar cells (PSCs) not only needs to maintain its operation at the high temperatures generated by direct sunlight but also endure the lattice strain created by temperature changes throughout the year. Li et al. fabricated high-quality perovskite crystalline films by adding a fluorinated polymer, the dipoles of which lowered formation energy of the perovskite black phase, decreased defect density, and also tuned the surface work function for charge extraction. Power conversion efficiencies of 23% were achieved for 1-square-centimeter devices that retained over 90% of their efficiency in testing conditions for up to 3000 hours and after repeated cycling whose temperature ranges between −60° and 80°C.

The research paper was published in Science 2023, 379, 399-403. Guixiang Li and Zhenhuang Su are the first authors, and Prof. Antonio Abate from Helmholtz-Zentrum Berlin (HZB), Prof. Meng Li from Henan University are the co-corresponding authors.

Fig. 1. Working mechanism and morphology characterization of perovskite films.

Paper link: https://www.science.org/doi/10.1126/science.add7331