Source: http://aoot.osa.org/ol/abstract.cfm?uri=ol-42-18-3618
Timestamp: 2019-04-24 19:03:17+00:00

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We report an optically pumped green perovskite vertical-cavity surface-emitter operating in continuous-wave (CW) with a power density threshold of ∼89 kW/cm2. The device has an active region of CH3NH3PbBr3 embedded in a dielectric microcavity; this feat was achieved with a combination of optimal spectral alignment of the optical cavity modes with the perovskite optical gain, an adequate Q-factor of the microcavity, adequate thermal stability, and improved material quality with a smooth, passivated, and annealed thin active layer. Our results signify a way towards efficient CW perovskite emitter operation and electrical injection using low-cost fabrication methods for addressing monolithic optoelectronic integration and lasing in the green gap.
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Fig. 1. Material analysis of CH 3 NH 3 PbBr 3 thin films showing (a) an XRD spectrum with SEM (top right) and AFM (bottom right) images, and (b) absorption coefficient and PL spectra with the Tauc plot (inset).
Fig. 2. Measurements showing (a) ASE and PL spectra of a pristine sample, i.e., CH 3 NH 3 PbBr 3 thin films deposited on a single-crystal sapphire substrate, (b) wavelength-dependent RI spectra for each material used for the fabrication of the perovskite vertical-cavity device, (c) reflectivity spectra for the top and bottom DBRs with the corresponding SEM cross sections (inset), (d) SEM cross section of the full device structure with the heterostructured active region (inset), and (e) reflectivity and PL spectra for the full device with the cavity resonance wavelength indicated.
Fig. 3. Device characteristics showing (a) integrated PL intensity and FWHM as a function of power density (log–log scale with inset shown in linear scale), and (b) evolution of emission spectra at different optical pumping power densities below and above the threshold.
Fig. 4. (a) RI and optical standing wave profile across the device. (b) Improvement in PL characteristics with annealing.

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