Ultrahigh energy storage and electrocaloric performance achieved …
Here, we present an effective method to achieve high energy storage performance, which is embedding crystalline polar clusters in amorphous thin films. A large energy density of 65.3 J cm −3, together with a high efficiency of 70.8% as well as excellent thermal stability, can be obtained in lead-free Sr 0.995 (Na 0.5 Bi 0.5 ) 0.005 (Ti 0.99 ...