Ferroelectric perovskite-type films with robust in-plane polarization toward efficient room-temperature chemiresistive sensing  

作　　者：Shiguo Han Guan-E Wang Gang Xu Junhua Luo Zhihua Sun 

机构地区：[1]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,No.155 Yangqiao West Road,Fuzhou 350002,China [2]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,No.155 Yangqiao West Road,Fuzhou 350002,China [3]University of Chinese Academy of Sciences,Chinese Academy of Sciences,No.19A Yuquan Road,Beijing 100039,China

出　　处：《Fundamental Research》2023年第3期362-368,共7页自然科学基础研究（英文版）

基　　金：supported by National Natural Science Foundation of China(22125110,21875251,21833010 and 21921001);the National Postdoctoral Program for Innovative Talents(BX2021315);the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(ZDBS-LY-SLH024);Youth Innovation Promotion of CAS(Y201851);the National Natural Science Foundation of China(21975254,21822109);International Part-nership Program of CAS(121835KYSB201800);Youth Innovation Promotion of CAS(2018342).

摘　　要：Ferroelectric materials have become key components for versatile device applications,and their thin films are highly desirable for integrating the miniaturized devices.Despite substantial endeavors,it is still challenging to achieve effective chemiresistive sensing in the ferroelectric films.Here,for the first time,we have exploited ferroelectric thin films of 2D hybrid perovskite BA_(2)EA_(2)Pb_(3)I_(10)(1),to fabricate the high-performance chemiresistor gas sensors.The spin-coated films of 1 exhibit high orientation and good crystallinity,thus preserving robust in-plane spontaneous polarization(P_(s)~2.0μC/cm^(2))and low electric coercivity.Notably,such ferroelectric filmbased sensors after electric poling enable the dramatic room-temperature sensing responses to NO_(2) gas,including high sensitivity(0.05 ppm^(-1)),extremely low detection limit(1 ppm)and fast responding rate(~6 s).Besides,the chemiresistive responses are remarkably enhanced by threefold(up to 320%)through electric poling.It is proposed that this behavior closely involves with strong in-plane ferroelectric polarization of 1 that generates a built-in electric field inhibiting the recombination of charge carriers.As far as we know,this ferroelectric-based film chemiresisor is one of the best room-temperature sensors for NO_(2) gas among all the existing candidate materials.These findings highlight great potential of ferroelectrics toward effective chemiresistive performances,and also establish a bright direction to explore their future device applications.

关 键 词：Ferroelectric-based films Hybrid perovskite 2D quantum-well In-plane polarization Chemiresistive sensing 

分 类 号：O48[理学—固体物理]