An organic-inorganic semiconducting compound of 1-methylpiperidinium triiodoplumbate(Ⅱ)(MPIP),adopting a one-dimensional ABX3 perovskite-like structure,has been synthesized.It is notable that MPIP undergoes a structu...An organic-inorganic semiconducting compound of 1-methylpiperidinium triiodoplumbate(Ⅱ)(MPIP),adopting a one-dimensional ABX3 perovskite-like structure,has been synthesized.It is notable that MPIP undergoes a structural phase transition(SPT)at T_(c)≌202 K,as confirmed by DSC and C_(p) analyses.Strikingly,MPIP exhibits remarkable switchable dielectric responses;that is,the distinct step-like anomalies in the vicinity of T_(c).The switching between high-dielectric and low-dielectric states makes MPIP a potential switchable dielectric material.Single-crystal structural analysis reveals that the most distinct difference between its high-temperature phase(above T_(c))and low-temperature phase(below T_(c))is the order-disorder transformation of a 1-methylpiperidinium cation,which accounts for its SPT and striking dielectric response.Besides this,MPIP shows semiconducting behaviour with an optical bandgap of ~2.48 eV,comparable to some other lead-iodide perovskites.The combination of semiconducting and dielectric attributes provides a new perspective for the design of hybrid perovskites as multifunctional materials.展开更多
基金the CAS-TWAS President program of the UCAS for financial supportsupported by the NSFC(21622108,21525104,21601188,91422301,21571178,51502288 and 51502290)+2 种基金the Strategic Priority Research Program of the CAS(XDB20000000)the Youth Innovation Promotion of CAS(2014262)the support from the State Key Laboratory of Luminescence and Applications(SKLA-2016-09).
文摘An organic-inorganic semiconducting compound of 1-methylpiperidinium triiodoplumbate(Ⅱ)(MPIP),adopting a one-dimensional ABX3 perovskite-like structure,has been synthesized.It is notable that MPIP undergoes a structural phase transition(SPT)at T_(c)≌202 K,as confirmed by DSC and C_(p) analyses.Strikingly,MPIP exhibits remarkable switchable dielectric responses;that is,the distinct step-like anomalies in the vicinity of T_(c).The switching between high-dielectric and low-dielectric states makes MPIP a potential switchable dielectric material.Single-crystal structural analysis reveals that the most distinct difference between its high-temperature phase(above T_(c))and low-temperature phase(below T_(c))is the order-disorder transformation of a 1-methylpiperidinium cation,which accounts for its SPT and striking dielectric response.Besides this,MPIP shows semiconducting behaviour with an optical bandgap of ~2.48 eV,comparable to some other lead-iodide perovskites.The combination of semiconducting and dielectric attributes provides a new perspective for the design of hybrid perovskites as multifunctional materials.
