Double-Bond-induced Morphotropic Phase Boundary leads to Enhanced Electrocaloric Effect in VDF-Based Polymer Flexible Devices
Florian Le Goupil, Konstantinos Kallitsis, Sylvie Tencé‐Girault, Cyril Brochon, Éric Cloutet, Guillaume Fleury, Georges Hadziioannou
Abstract
Electrocaloric (EC) polymers answer the needs for green, efficient, and flexible coolers as well as thermal management in wearable electronics. A morphotropic phase boundary is induced for the first time in P(VDF- ter -TrFE- ter -CFE) polymers near room temperature, by soft one-pot addition of small fractions of double bonds. It results in flexible devices with remarkable cooling performance, Δ T EC = 5.8 K for E < 100 MV·m –1 and up to 9.3 K at higher fields, which are maintained when bent to various angles required for wearable electronics. This work paves the way for the development of scalable, high-performance, and flexible organic cooling devices.