One step low pressure CVD preparation of deep-blue emissive Cs3Cu2I5 perovskite film Kai Ou, Yi He, Wenting Zhang, Yuxiang Ni, Yudong Xia and Hongyan Wang Eur. Phys. J. Plus, 138 10 (2023) 940 Published online: 24 October 2023 DOI: 10.1140/epjp/s13360-023-04571-4