A new technique has been developed allowing reliable atomic-resolution images to be taken, for the first time, of hybrid photoactive perovskite thin films. These images have significant implications for improving the performance of solar cell materials and broadened the understanding of these technologically important materials. The breakthrough was achieved by a joint team from the University of Oxford and Diamond Light Source who have just released a new paper to be published in Science on 30 October, titled "Atomic-scale microstructure of metal halide perovskite."