Multi‐Functional Smart Skin for High‐Efficiency Energy‐Saving Buildings

ABSTRACT Exploring scalable smart devices with broadband modulation, zero‐energy input (without an external energy supply) controllable operation mode, and thermal insulation is of great significance for the building energy‐saving. However, it remains a grand challenge to integrate such essential multi‐functionality into one single device for affording extraordinary energy‐saving effect. Here, we present a single‐layer structured multi‐functional smart “skin” (MSS) composed of thermal managing unit of high solar reflectance ( R sol = 93.8%) and low thermal conductivity (ĸ = 54 mW/m·K) and actuation unit of multi‐responsive shape‐memory effect. The ingenious integration of static thermal radiation property and dynamic shape changing capability enables the MSS superb solar modulating ability (Δ T sol = 88.1%). Selecting twenty‐two cities with distinct climate conditions as the sample for analysis, the average energy‐saving efficiency and carbon emission reduction of the MSS is 26.7% and 58.3 kg/m 2 . In addition, the MSS possesses zero‐input controllable operation mode in all‐season as assembling with a perovskite solar cell. This concept promotes the application of advanced functional devices in buildings, automobiles, and smart textiles.