Customizing Room‐Temperature Perovskite Ferroelectrics toward the Multichannel Domain Manipulation

Manipulating domain structure in ferroelectrics by external stimuli presents a fascinating avenue for new‐generation electronic devices. However, multichannel controlling of ferroelectric domains is still a challenge, due to the lack of knowledge on their bistability to diverse physical stimuli. Herein, we have customized a series of perovskite ferroelectrics, (CnH2n+1NH3)2(CH3NH3)2Pb3Br10 (n = 2‐7), of which the Curie temperatures are modulated in a wide temperature range (ΔT = 74 K) by tailoring chain length of organic spacers. Strikingly, the n = 7 member is a room‐temperature ferroelectric with bistable characteristics, thus endowing the manipulation of domains via four channels (i.e., thermal, stress, light, and electric fields). Such a non‐volatile memory behavior of the stress‐switching domain is unprecedented in hybrid perovskite ferroelectrics. This manipulation of domains reveals unique bistability of its ferroelectric orders, which sheds light on the future advance of customizing electric‐ordered materials toward the smart device applications.