An unprecedented CsPbBr3-based polar Dion-Jacobson type bilayered hybrid, (2meptH2)CsPb2Br7 (1, where 2mept = 2-methyl-1,5-diaminopentane), has been reported. Polarization could benefit the charge transport to induce low Ntrap. 1 exhibits a large on/off ratio (∼103), fast response time (∼200 μs) and high photodetectivity (∼109 Jones) for promising UV photodetection.
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