Yuan Chunqing, Li Xinyue, Semin Sergey, Feng Yaqing, Rasing Theo, Xu Jialiang
School of Chemical Engineering and Technology , Tianjin University , Yaguan Road 135 , Tianjin 300350 , P.R. China.
Institute for Molecules and Materials (IMM) , Radboud University , Heyendaalseweg 135 , 6525AJ Nijmegen , The Netherlands.
Nano Lett. 2018 Sep 12;18(9):5411-5417. doi: 10.1021/acs.nanolett.8b01616. Epub 2018 Aug 16.
Hybrid organic/inorganic lead halide perovskites (LHPs) have recently emerged as extremely promising photonic materials. However, the exploration of their optical nonlinearities has been mainly focused on the third- and higher-order nonlinear optical (NLO) effects. Strong second-order NLO responses are hardly expected from ordinary LHPs due to their intrinsic centrosymmetric structures, but are highly desirable for advancing their applications in the next generation integrated photonic circuits. Here we demonstrate the fabrication of a novel noncentrosymmetric LHP material by introducing chiral amines as the organic component. The nanowires grown from this new LHP material crystallize in a noncentrosymmetric P1 space group and demonstrate highly efficient second harmonic generation (SHG) with high polarization ratios and chiroptical NLO effects. Such a chiral perovskite skeleton could provide a new platform for future engineering of optoelectronic functionalities of hybrid perovskite materials.
有机/无机杂化卤化铅钙钛矿（LHP）最近已成为极具前景的光子材料。然而，对其光学非线性的探索主要集中在三阶及更高阶非线性光学（NLO）效应上。由于其固有的中心对称结构，普通的LHP很难产生强烈的二阶NLO响应，但这对于推动其在下一代集成光子电路中的应用非常理想。在此，我们展示了通过引入手性胺作为有机成分来制备一种新型非中心对称LHP材料。从这种新型LHP材料生长出的纳米线在非中心对称的P1空间群中结晶，并表现出具有高偏振比和手性光学NLO效应的高效二次谐波产生（SHG）。这种手性钙钛矿骨架可为未来混合钙钛矿材料的光电功能工程提供一个新平台。
