Harnessing the topotactic transition in oxide heterostructures for fast and high-efficiency electrochromic applications.

The article discusses mobile oxygen vacancies offering a substantial potential to broaden the range of optical functionalities of complex transition metal oxides due to high mobility and the interplay with correlated electrons. Topics include the coloration efficiency reaches ~80 cm2 C−1, means that a 300-nm-thick layer blocks 99% of transmitted visible light by the electrical switching; and the transparent BM-CFO has changed to a highly conducing dark-colored P-CFO.