2D Hybrid perovskite incorporating cage-confined secondary ammonium cations toward effective photodetection
2022
Hua, Lina | Chen, Huaixi | Han, Shiguo | Xu, Haojie | Lü, Lei | Tang, Liwei | Wang, Beibei | Luo, Junhua | Sun, Zhihua
By confining the secondary dimethylammonium (DMA) cation in a distorted perovskite cavity, we assembled a new 2D Ruddlesden–Popper metal halide perovskite of (i-BA)₂(DMA)Pb₂Br₇ (i-BA = n-isobutylammonium), in which the DMA cation templates its inorganic perovskite framework and the quantum-well motif renders a fascinating photoresponse. Crystal-based planar arrays exhibit effective photodetection behaviors, including a notable detectivity (∼5.6 × 10¹² Jones), a high responsivity (∼1.25 A W⁻¹) and a large switching ratio (∼1.5 × 10³). These properties result from its low dark current restricted to the hopping barrier of the insulated organic bilayer and a strong in-plane photoresponse correlated with the perovskite network. This work throws light on the targeted exploration of photosensitive candidates in the family of organic–inorganic hybrid perovskites, as well as high-performance devices.
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