A dual-mode self-cleaning film for durable passive radiative cooling and solar heating

. Furthermore, the heating side (HS) generates coral-like black micro-nanostructures on the polyimide tape surface by a femtosecond laser one-step approach. It has exceptionally high solar absorption (98%) and can yield a temperature rise of about 40 °C at one-sun intensity. In addition, the material possesses excellent superhydrophobicity and chemical stability over a wide pH range. It exhibits favorable self-cleaning performance with a contact angle of more than 155°. This thermal management film holds significant application potential in building energy efficient devices, giving new insights for realizing passive temperature regulation.