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Highly compact and smooth all-inorganic perovskite films for low threshold amplified spontaneous emission from additive-assisted solution processing

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Abstract

Solution-processed perovskites have shown great potential for coherent light emission, i.e. lasing, owing to their high optical gain and tunable gain profile over a broad range. For all-inorganic perovskite films, however, morphology-control is still a challenge to suppress the optical loss. Herein, we report a facile one-step solution-based approach to grow CsPbX3 (X = Br and I) perovskite films with a pinhole-free and ultra-smooth surface, by incorporating long-chain octylammonium halide as an additive. The addition of octylammonium halide hardly affects the Auger recombination rate under high excitation. The optimal perovskite films exhibit roughness less than 2 nm and low scattering loss. These merits facilitate wavelength tunable amplified spontaneous emission (ASE) with a low threshold of 14.9 μJ cm−2 and a high net gain coefficient of 380 cm−1.

Graphical abstract: Highly compact and smooth all-inorganic perovskite films for low threshold amplified spontaneous emission from additive-assisted solution processing

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Publication details

The article was received on 16 Sep 2019, accepted on 12 Nov 2019 and first published on 13 Nov 2019


Article type: Paper
DOI: 10.1039/C9TC05090F
J. Mater. Chem. C, 2019, Advance Article

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    Highly compact and smooth all-inorganic perovskite films for low threshold amplified spontaneous emission from additive-assisted solution processing

    J. Li, W. Zhou, L. Jiang, Z. Fang, Z. Yang, C. Lin, X. Xu, Z. Ye, H. Zhu and H. He, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC05090F

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