“Liquid Knife” to Fabricate Patterning Single‐Crystalline Perovskite Microplates toward High‐Performance Laser Arrays

Abstract

A facile and effective "liquid knife" is created by controlling the dewetting process of the liquid precursor, yielding patterning single-crystalline perovskite microplates with uniform size, precise positioning, high quality, and low lasing thresholds. The sizes and location of single-crystalline perovskite are controllable, leading to mode-tunable lasing emission and patterned lasers.

Recent Progress in Single‐Crystalline Perovskite Research Including Crystal Preparation, Property Evaluation, and Applications

“…These optoelectronic properties make hybrid perovskites ideal candidates for solar cell applications,22, 25, 30, 31, 32, 33, 34, 35, 36, 37, 38 LEDs,39, 40, 41 lasers,42, 43 etc. A certificated power conversion efficiency (PCE) as high as 22.1% has been achieved, which approaches the highest PCE for Si solar cells 44.…”

“…Over the last 2 years, an increasing number of researchers have begun studying single‐crystalline perovskites, including crystal preparations,21, 27, 28, 43, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65 property studies,21, 27, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80 and applications 56, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91. For example, an extremely long carrier lifetime (up to 20 µs) and carrier diffusion length (175 µm) have been found,21 which has received a great deal of attention.…”

Chip‐Scale Fabrication of Uniform Lead Halide Perovskites Microlaser Array and Photodetector Array

“…[34] Meanwhile, Feng et al have synthesized single crystal perovskite microplate laser arrays by splitting the solutions into periodic arrays with a silicon micropillar structure. [35] In 2017, by using more generic polydimethylsiloxane (PDMS) microstructures, all-inorganic lead halide perovskite microlasers were also synthesized.…”

Continuous-wave optically pumped green perovskite vertical-cavity surface-emitter

“…These approaches used hybrid perovskites in the form of powders with vertical cavities [10], cavity-free thin films [11,12], crystals with vertical cavities [13], microdisks/plates with whispering gallery modes (WGMs) [14,15], micro/nanowires with Fabry-Perot (FP) cavities [16,17] and gratings [18], micro/ nanorods with FP cavities [19], cavity-free colloidal quantum dots [20] and WGMs [21], colloidal nanocrystals with WGMs [22], FP cavities [23], and vertical cavities [24]. Compared to ASE, SE typically has a narrower linewidth and obvious threshold, and exhibits beam divergence and polarization [25].…”

“…All perovskites green-light emitters mentioned above [10,11,[13][14][15][16][17][18][19][20][21][22][23][24] were optically pumped using ultrashort pulses (typically, femtoseconds). An optically pumped NIR perovskite laser using longer pulses (nanoseconds) was recently demonstrated [26], but it was operated in a cryogenic environment.…”