Abstract: A method is provided for producing an electro-optical and/or optoelectronic layer. In the method, the layer is formed with perovskite material of the composition ABX3 by cold gas spraying at least a starting material having the perovskite material. X is also formed with at least one halogen or a mixture of multiple halogens. In the method for producing an electro-optical or optoelectronic device with at least one electro-optical or optoelectronic layer, the at least one electro-optical or optoelectronic layer is formed with a perovskite material by the method. The device is, in particular, an electro-optical or optoelectronic device, such as an energy converter, a solar cell, a light diode, or an X-ray detector. The device has an electro-optical layer of this type.