Transient Lasing Behaviors in MAPbBr₃ Perovskite Microcavities

Abstract

With tunable wavelength and low lasing threshold, organo-lead perovskites have become promising candidates as lasing sources, such as microlasers for optical integration. It is essential to understand their lasing mechanism and control the lasing behavior at an ultrafast time scale. In this work, we prepared a series of square MAPbBr 3 single-crystalline microcavities with/without Bragg reflectors. The transient lasing mode behavior was found to be size-dependent, i.e., a stronger red shift and a slower decay occurred in larger microplates. This inevitable transient red shift reduces the mode quality of perovskite microlasers, which can be attributed to the electron−hole plasma decay at a high excitation density. For optimization, distributed Bragg reflectors (DBRs) were applied with successful suppression of the transient mode shift. This work provides systematic insight to understand the transient behaviors of perovskite lasing microcavities, which would guide the design of perovskite-based light sources for optical communication and integration.

Temporal‐Spatial‐Resolved Lasing Dynamics in Customized Solution Grown Perovskite Single‐Crystal Microcavities

“…[21] Wang and co-workers investigated the red-shifting in individual microplate at high excitation intensity and successfully suppressed this mode shifting using distributed Bragg reflectors to optimize the mode quality of microlasers. [22,23] At the same time, it is well recognized that local heterogenous photoresponse or electroresponse of perovskite grains would affect the performance of solar cell or LED devices, while these studies are lacking in micro/nanolasers. Therefore, it is necessary to investigate and understand the spatial characteristics of microcavity lasing.…”

Photophysical Properties of Submicrometer Ultrathin Perovskite Single-Crystal Films

“…With less optical heterogeneity at multiple length scales caused by defects and GBs, single crystals provide an ideal platform for characterizing the intrinsic photophysical features within the structure, for revealing the carrier dynamic and underlying mechanism that accounts for the superiorities of OIHP for diverse optoelectronic applications, such as electron−hole plasma (EHP) and a Drude-like model from a UTSC-based microcavity laser. 22,23 To improve the current performance, such as PSCs with respect to the Shockley−Queisser limit, more reliable knowledge about carrier behaviors for UTSC perovskite films is urgently needed. 24 In this work, we more closely compositionally and spectroscopically characterized one of the most studied prototypical OIHPs, CH 3 NH 3 PbBr 3 , in both its PLC and high-quality UTSC films.…”

“…A non-Hermitian lasing device and a supersymmetry lasing array had been demonstrated on the basis of an ultrathin single-crystal (UTSC) film. − Even though there are performance advantages and novel applications, single-crystal perovskite optoelectronic devices have been manufactured much less often due to the difficulty of finding a controllable and effective way to fabricate large UTSC films, which also had led to limited investigations of UTSC perovskite films. With less optical heterogeneity at multiple length scales caused by defects and GBs, single crystals provide an ideal platform for characterizing the intrinsic photophysical features within the structure, for revealing the carrier dynamic and underlying mechanism that accounts for the superiorities of OIHP for diverse optoelectronic applications, such as electron–hole plasma (EHP) and a Drude-like model from a UTSC-based microcavity laser. , To improve the current performance, such as PSCs with respect to the Shockley–Queisser limit, more reliable knowledge about carrier behaviors for UTSC perovskite films is urgently needed …”

Ultra‐Rapid Synthesis of Perovskite Micro/Nanocubes Induced by Nanoporous Surface for Micro/Nanolasers

“…[18] General methods to synthesize perovskite micro/nanostructures with regular shapes for lasing application include chemical vapor deposition (CVD) [19][20][21] and solution route. [17,22,23] In the case of CVD, by controlling the growth conditions, perovskite crystals with different morphologies, such as nanoplatelets, [24] triangular pyramid nanocrystals, [25] micro/ nanorods, [26] and nanospheres, [27] can be fabricated. However, CVD methods require high temperatures, a strictly controlled atmosphere, and a long growth time (approximately several hours).…”