Inorganic-organic hybrid lead-halogen perovskite ferroelectric materials have excellent ferroelectric properties and semiconductor properties, and have become the frontier research direction of optoelectronic functional materials in recent years. However, lead toxicity in such materials has been a problem that has plagued its further development. In lead-halogen perovskite materials, use trivalent metals (In3 +, Bi3 +, Sb3 +) and monovalent metals (Cu +, K +, Na +, Li +, Ag +) to replace the toxic element Pb2 + to construct metal-halogen double perovskite hybrid materials Is an effective method and strategy for designing and synthesizing non-lead inorganic organic hybrid perovskite materials. At the same time, this type of material also has the characteristics of long carrier life, high defect tolerance, low exciton binding energy, etc., which is expected to promote the further development of high-performance green optoelectronic materials.
The team of Luo Junhua, a researcher of "Inorganic Optoelectronic Functional Crystal Materials", State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences has been a key project of the National Natural Science Foundation of China, the National Outstanding Youth Fund, the Basic Frontier 0-1 Original Innovation Project of the Chinese Academy of Sciences, and a strategic leader of the Chinese Academy of Sciences With special funding, based on the three-dimensional perovskite material CsPbBr3, the first two-dimensional double-layer non-lead bimetallic halogen inorganic organic hybrid "optical ferroelectric semiconductor" (n-propylammonium) 2CsAgBiBr7 was prepared. Studies have shown that the metal halide octahedral distortion and the ordering of organic cations synergistically induce the ferroelectric spontaneous polarization of the compound; at the same time, the material exhibits good photoelectric detection performance for the optical radiation in the intrinsic absorption region, showing a large The photoelectric detection on / off ratio (104), fast response time (141 μs) and high detection rate (5.3 × 1011 Jones). This work provides a new strategy for the design of non-lead "photoferroelectric semiconductor" materials. Relevant research results were published in the form of "German Applied Chemistry" (Angew. Chem. Int. Ed., 2020, DOI: 10.1002 / anie.201916254) in the form of communication.
Ferroelectric materials are a type of functional materials with spontaneous polarization and the spontaneous polarization can be reversed under the action of an external electric field. Its research involves phase transition, symmetry breaking, polarity, spontaneous polarization, and thus has a nonlinear frequency doubling , Piezoelectricity, pyroelectricity, ferroelectricity, flexure electricity, electro-optic effect and high dielectric constant and other properties, have important applications in storage, ultrasound, optoelectronic technology. Previously, the team began by studying the phase transition of the structure of matter caused by molecular motion (Adv. Fuct. Mater., 2012, 22, 4855), and further constructed a series of design strategies that induced the polarization effect induced by the phase transition of the solid symmetric broken structure. Polar photoelectric crystal materials (Angew. Chem., Int. Ed., 2012, 51, 3871; Angew. Chem., Int. Ed, 2018, 57, 9833; J. Am. Chem. Soc., 2015, 137, 15560; J. Am. Chem. Soc., 2017, 139,15900; Adv. Mater., 2013, 25, 4159; Adv. Mater., 2015, 27, 4795; Chem. Mater., 2015, 27, 4493; Chem. Mater., 2017, 29, 3251); at the same time, because the inorganic-organic hybrid metal halogen perovskite material has semiconductor properties such as high absorbance and excellent carrier transmission, the team has deeply studied the photoelectric performance of inorganic-organic hybrid semiconductors Start with (Angew. Chem., Int. Ed, 2019, 58, 15757; Angew. Chem., Int. Ed, 2020, 59, 3429; J. Am. Chem. Soc, 2019, 141, 12197; Small, 2019, 15, 1901194; Small, 2020, 16, 1907020; Chem. Mater, 2018, 30, 408; Chem. Mater, 2019, 31, 5927; Laser Photonics Rev, 2018, 12, 1800060; Chem. Soc. Rev, 2019, 48, 517) , Introducing ferroelectricity into inorganic-organic hybrid semiconductors, using the response of the semiconductor to the light field combined with the bulk photovoltaic effect of ferroelectric polarization to innovatively propose and carry out the research of "inorganic-organic hybrid opto-ferroelectric semiconductors", in Inorganic-organic hybrid "opto-ferroelectric semiconductor" materials have carried out systematic and in-depth research on the structural design, crystal growth, optoelectronic device assembly, optoelectronic performance control, etc. and made a series of innovative research progress to achieve the ferroelectric photovoltaic effect, multi-axis ferroelectric Photovoltaic, and further use the ferroelectric photovoltaic effect to realize self-driven photoelectric detection and large polarization ratio polarized photoelectric detection (Angew. Chem., Int. Ed., 2016, 55, 6545; Angew. Chem., Int. Ed., 2016, 55, 11845; Angew. Chem., Int. Ed., 2017, 56, 12150; Angew. Chem. Int. Ed, 2018, 57, 8140; Angew. Chem., Int. Ed, 2018, 57, 16764; Angew Chem. Int. Ed, 2019, 58, 14504; Angew. Chem. Int. Ed, 2020, 59, 3933; J. Am. Chem. Soc., 2018, 140, 6806; J. Am. Chem. Soc, 2019, 141, 2623; J. Am. Chem. Soc, 2019, 141, 3812; J. Am. Chem. Soc, 2019, 141, 7693; J. Am. Chem. S oc, 2019, 141, 12470; J. Am. Chem. Soc, 2020, 142, 55; J. Am. Chem. Soc, 2020, 142, 1159; Adv. Func. Mater, 2018, 28, 1705467; Adv. Funct. Mater, 2019, 1805038; Adv. Funct. Mater, 2020, 1905029).
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