The Electron–Hole Plasma Contributes to Both Plasmonic and Photonic Lasing from CH₃NH₃PbBr₃ Nanowires at Room Temperature

Abstract

Lead halide perovskites have gained tremendous attentions in many fields, especially in nanolasers, owing to the excellent optoelectronic properties. However, the underlying lasing mechanism is not clear in both plasmonic and photonic nanolasers at room temperature. Here, the plasmonic lasers and the photonic counterparts based on organic–inorganic hybrid lead tri‐bromine perovskite nanowires are achieved at room temperature and are compared in terms of lasing evolution, lasing wavelengths, and lasing dynamics. The same spectra evolution and the same emission wavelength indicate that the plasmonic and the photonic CH3NH3PbBr3 nanowire lasers have the same gain origination. The calculated Mott density lower than the threshold density and lasing photon energy lower than exciton energy prove that an electron–hole plasma contributes to both the two types of lasing actions from perovskite nanowires at room temperature. The work deepens the understanding of underlying mechanism of perovskite nanowire lasers.

Toward Continuous-Wave Pumped Metal Halide Perovskite Lasers: Strategies and Challenges

“…Therefore, operating carrier densities well below the Mott density are necessary for polariton lasing. For instance, the estimated Mott densities for MAPbBr 3 and CsPbBr 3 are ∼8 × 10 17 cm –3 and ∼2 × 10 17 cm –3 , respectively, which means that most reported lasing thresholds for perovskites (>10 17 cm –3 ) are close to or even above the estimated Mott density. , …”

“…For the lasing mechanism in perovskites, several studies have been done to reveal the role of excitons. ,,,,− Polariton lasing has been demonstrated by Xiong et al . and Zhu et al .…”

Metal Halide Perovskite Nanowires: Controllable Synthesis, Mechanism, and Application in Optoelectronic Devices

“…Compared to MA-based perovskite nanomaterials, FA-based perovskite nanomaterials have better photostability and wider wavelength tunability, suggesting that FA-based perovskites may be more promising and stable candidates for new perovskite-based lasers [93]. Various mechanisms have been proposed to explain the perovskite lasers, such as the plasma mode and photon mode [15,91,[116][117][118].Plasma lasers typically have lower thresholds than those of conventional photon lasers [116,119]. Jin et al introduced a single-crystal MAPbI 3 NW into a plasma laser as an organic-inorganic semiconductor gain material, achieving a lower threshold (13.5 µJ cm −2 ) under ambient conditions [119].…”

“…Various mechanisms have been proposed to explain the perovskite lasers, such as the plasma mode and photon mode [ 15 , 91 , 116 , 117 , 118 ].Plasma lasers typically have lower thresholds than those of conventional photon lasers [ 116 , 119 ]. Jin et al introduced a single-crystal MAPbI 3 NW into a plasma laser as an organic-inorganic semiconductor gain material, achieving a lower threshold (13.5 μJ cm −2 ) under ambient conditions [ 119 ].…”

Flexible perovskite scintillators and detectors for X-ray detection

“… 6 Therefore, the development of novel semiconductors as active layer in both indirect and direct X-ray detectors are quite urgent. Recently, metal halide perovskites (MHPs) have attracted considerable attention in various optoelectronic applications, including solar cells, 7 light emitting diodes (LEDs), 8 lasers, 9 and radiation detectors. 10 , 11 , 12 Meanwhile, they have a relatively high atomic number, moderate density and tunable bandgaps with some of the properties even superior to conventional materials, making them great candidates as active materials in X-ray detectors.…”