High Detectivity and Rapid Response in Perovskite CsPbBr₃ Single-Crystal Photodetector

Abstract

Band gap tunable hybrid organic−inorganic lead halide perovskites (APbX 3 , A = CH 3 NH 3 + and NH 2 CHNH 2 + , and X = Cl, Br, or I) have attracted significant attention in optoelectronic-and photovoltaic-related fields on account of their outstanding optoelectronic properties. Single crystals of hybrid perovskites, such as CH 3 NH 3 PbI 3 and CH 3 NH 3 PbBr 3 , were certified to be advantageous over thin films as photodetectors. However, their resistance toward heat and moisture hinders their future development. Fully inorganic perovskite CsPbBr 3 stands a chance to fill the gap as a novel photodetector with perovskite structure. We revealed the growth of CsPbBr 3 single crystal was of a 2D nucleation mechanism. Similarities of d values and octahedra arrangements along [101] and [020] orientations restricted single-crystal growth. Under optimized conditions, orthorhombic CsPbBr 3 single crystals with (101) crystallographic facets were grown by using methyl alcohol as antisolvent from saturated DMSO solution. The optoelectronic properties of the single crystal were explored through a metal− semiconductor−metal photodetector device. Meanwhile, their steady and transient performances were also investigated. A highest responsivity of 0.028 A/W and a response time of <100 ms were achieved.

Combination of solution-phase process and halide exchange for all-inorganic, highly stable CsPbBr3 perovskite nanowire photodetector

“…5e. The rise time (from 10% to 90% of the saturated value) is about 10 ms, and the decay time (from 90% to 10% of the peak value) is 22 ms. Due to the good singlecrystalline, the detectivity and responsivity of our NWs film PDs are at the same level as the reported CsPbBr 3 single crystal PDs [44,45]. Meanwhile, the response time is better than those of other PDs reported with metalsemiconductor-metal (MSM) structure (Table S1).…”

Broadband, Ultrafast, Self‐Driven Photodetector Based on Cs‐Doped FAPbI3 Perovskite Thin Film

“…In spite of the above achievements, it is inevitable to point out that the above devices are characterized by relatively low specific detectivity and slow response speed, which greatly limit their further applications. In addition, most of the perovskite photodetectors need external bias voltage . Here, in this study, we report a high‐performance photodetector based on formamidinium cesium lead iodide (FA 1− x Cs x PbI 3 ), which has a band gap of 1.51 eV and has demonstrated to be ideal material for photovoltaic devices application .…”

Cation Exchange‐Induced Dimensionality Construction: From Monolayered to Multilayered 2D Single Crystal Halide Perovskites

“…Three sites on seemingly independent layers were selected and the results are shown in Figure b. Lattice fringes of orthorhombic CsPbBr 3 ( a = 8.24 Å, b = 8.20 Å, and c = 11.75 Å) can be clearly distinguished, and all the lattice orientations of three sites are indeed consistent. The SAED results show sole pattern, which reveals the single crystal nature of the whole stacking‐like structure.…”