All-Inorganic Perovskite CsPb2Br5 Microsheets for Photodetector Application

Abstract

Lead-halide perovskites have emerged as one kind of important optoelectronic materials with excellent performance in photovoltaic and light-emitting diode applications. Herein, we reported all-inorganic perovskite CsPb 2 Br 5 microsheets prepared by a facile injection method. Through the X-ray diffraction (XRD) and Scanning Electron Microscope (SEM), it could be seen that the CsPb 2 Br 5 microsheets showed single tetragonal crystalline phase and kept uniform square shape. Moreover, the as-synthesized CsPb 2 Br 5 microsheets exhibited photoluminescence emission at 513 nm, and the UV-vis absorption spectrum further indicated the band gap of CsPb 2 Br 5 microsheets was ≈2.50 eV. Additionally, the as-fabricated CsPb 2 Br 5 microsheets based photodetector exhibited faster photoresponse characteristics of short rise time (0.71 s) and decay time (0.60 s), which demonstrated its promising application as high performance electronic and optoelectronic devices.

Inhibition of In‐Plane Charge Transport in Hole Transfer Layer to Achieve High Fill Factor for Inverted Planar Perovskite Solar Cells

“…This work indicates that rational balance of charge transport properties in both in‐plane and out‐of‐plane directions of the HTL is crucial to achieve high FF and PCE performance of PSCs. It is believed that this concept should also work in other optoelectronic devices, such as organic solar cells, quantum dot solar cells, and photodetectors …”

Recent progress in perovskite-based photodetectors: the design of materials and structures

“…The planar MoS 2 /CH 3 NH 3 PbI 3 photodetector device exhibited a responsivity of 28 AW −1 at a light intensity of 0.7 mW cm −2 and a voltage bias of 5 V (Figure 9(f)). Xiaosheng Tang research group [102] prepared all-inorganic perovskite CsPb 2 Br 5 microsheets by a facile injection method. The as-synthesized CsPb 2 Br 5 microsheets exhibited photoluminescence emission at 513 nm.…”

A CTAB-mediated antisolvent vapor route to shale-like Cs4PbBr6 microplates showing an eminent photoluminescence

“…[10][11][12][13][14][15][16][17] Compared with nanoscale materials, the large-sized perovskites not only possess better stability but also are convenient for application exploration. [18][19][20][21][22][23][24][25][26][27][28] Furthermore, it is well known that the large-sized crystals are very important to identify the essential properties of a material. [18][19][20] As a result, more and more researchers have recently begun to focus on the synthesis of microscale or even centimeter-scale perovskite crystals.…”

“…[18][19][20] As a result, more and more researchers have recently begun to focus on the synthesis of microscale or even centimeter-scale perovskite crystals. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Currently, pure-phase CsPbBr 3 perovskite crystals with dimensions of several millimeters were successfully prepared by an antisolvent crystallization method. 19 Unfortunately, such large sized CsPbBr 3 crystals are almost non-luminescent.…”

“…[12][13][14][15]18,19,31,32 Therefore, developing an effective route for the synthesis of large scale plate-like Cs 4 PbBr 6 perovskite materials with highly photoluminescence is of great signicance for practical applications. 17,[21][22][23][24][25]29,30 Herein, for the rst time, we report a facile and efficient route for the synthesis of highly luminescent shale-like Cs 4 PbBr 6 microplates with hundreds of microns in lateral dimension and tens of microns in thickness. The synthesis of shale-like Cs 4 PbBr 6 microplates was designed according to the supersaturated recrystallization method with the assistance of antisolvent vapor, in which, the heated toluene vapor is diffused into the DMF solution containing PbBr 2 , CsBr, and CTAB.…”