- Tao Wu
- Biochemistry, Genetics and Molecular Biology; Materials Science; Engineering; Chemical vapor deposition; Cube-corner pyramids; Fabry-Pérot; Lasing; Perovskite
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Recently, organometal halide perovskite-based optoelectronics, particularly lasers, have attracted intensive attentions because of its outstanding spectral coherence, low threshold, and wideband tunability. In this work, high-quality CH NH PbBr single crystals with a unique shape of cube-corner pyramids are synthesized on mica substrates using chemical vapor deposition method. These micropyramids naturally form cube-corner cavities, which are eminent candidates for small-sized resonators and retroreflectors. The as-grown perovskites show strong emission ≈530 nm in the vertical direction at room temperature. A special Fabry-Pérot (F-P) mode is employed to interpret the light confinement in the cavity. Lasing from the perovskite pyramids is observed from 80 to 200 K, with threshold ranging from ≈92 µJ cm to 2.2 mJ cm , yielding a characteristic temperature of T = 35 K. By coating a thin layer of Ag film, the threshold is reduced from ≈92 to 26 µJ cm , which is accompanied by room temperature lasing with a threshold of ≈75 µJ cm . This work advocates the prospect of shape-engineered perovskite crystals toward developing micro-sized optoelectronic devices and potentially investigating light-matter coupling in quantum optics.