Optically Controlled Coercive Field of MAPbl_(3)/P(VDF-TrFE)Ferroelectric Composite Films  

作　　者：SU Yangfan SUN Yiran ZHOU Dikui TANG Xiaoming HAN Gaorong REN Zhaohui 

机构地区：[1]State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou,310027,P.R.China [2]Center of Electron Microscope,School of Materials Science and Engineering,Zhejiang University,Hangzhou,310027,P.R.China [3]Research Center for Humanoid Sensing,Zhejiang Lab,Hangzhou,311100,P.R.China

出　　处：《Chemical Research in Chinese Universities》2023年第2期228-233,共6页高等学校化学研究（英文版）

基　　金：Natural Science Foundation of Zhejiang Province,China(No.LR21E020004);National Natural Science Foundation of China(No.U1909212);Project of the Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,China(No.2021SX-FR007).

摘　　要：Ferroelectric polymers,such as poly(vinylidene fluoride-trifluoroethylene)[P(VDF-TrFE)or PVTF]have attracted growing interest in developing flexible devices because of their excellent ferroelectricity and piezoelectricity.High coercive field(E c)inherent to PVTF for switching its polarization,however,is not beneficial for practical memory or sensor device application.Different strategies,including irradiation and interface control,have been thus developed to reduce E c.Despite many efforts,a facile approach to tailoring intrinsic E_(c) of PVTF has not been documented.In this work,an optically controlled E_(c) was reported,which is achieved for the first time by introducing photosensitive MAPbI3 nanocrystals into PVTF matrix.When exposed to the irradiation of 532 nm laser light,a decreased E_(c) of the composites can be achieved reversibly by increasing the light density.The decreased level of E_(c) increases as the MAPbI3 content enhanced,and a 10.7%reduction of E_(c) can be achieved in 15%(mass fraction)MAPbI3/PVTF samples.These results could be attributed to loading an internal stress on PVTF,which was generated by the photostriction of MAPbI3 nanocrystals.This explanation was further supported by in-situ XRD results under irradiation of 532 nm laser light.Our findings may offer the opportunity to optically modulate the ferroelectric properties of PVTF composites for optimized device performances.

关 键 词：Poly(vinylidene fluoride-trifluoroethylene)[P(VDF-TrFE)] MAPbI_(3) Photostriction Optically controlled coercive field 

分 类 号：TB33[一般工业技术—材料科学与工程]