High Photoluminescence Eﬃciency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite Semiconductors
Klintberg, Lina E
Snaith, Henry J
Journal of Physical Chemistry Letters
American Chemical Society
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Deschler, F., Price, M., Pathak, S., Klintberg, L. E., Jarausch, D., Higler, R., Hüttner, S., et al. (2014). High Photoluminescence Eﬃciency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite Semiconductors. Journal of Physical Chemistry Letters, 5 1421-1426. https://doi.org/10.1021/jz5005285
The study of the photo-physical properties of organic-metallic lead-halide perovskites, which demonstrate excellent photovoltaic performance in devices with electron- and hole-accepting layers, helps to understand their charge photo-generation and recombination mechanism and unravels their potential for other optoelectronic applications. We report surprisingly high photoluminescence (PL) quantum efficiencies, up to 70%, in these solution-processed crystalline films. We find that photoexcitation in the pristine CH3NH3PbI3-xClx perovskite results in free charge carrier formation within 1ps, and that these free charge carriers undergo bimolecular recombination on timescales of 10s to 100s of nsecs. To exemplify the high luminescence yield of the CH3NH3PbI3-xClx perovskite, we construct and demonstrate the operation of an optically-pumped vertical cavity laser comprising a layer of perovskite between a dielectric mirror and evaporated gold top mirrors. These long carrier lifetimes together with exceptionally high luminescence yield are unprecedented in such simply prepared inorganic semiconductors and we note that these properties are ideally suited for photovoltaic diode operation.
Mixed-halide lead perovskites, spectroscopy, lasing, photovoltaics, charge generation
We thank the Engineering and Physical Sciences Research Council, and the Winton Programme (Cambridge) for the Physics of Sustainability for funding. M.P. wants to thank the Cambridge Commonwealth Trust and the Rutherford Foundation of New Zealand for funding.
External DOI: https://doi.org/10.1021/jz5005285
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245468
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