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Organic-Inorganic Hybrid Perovskite Quantum Dots with High PLQY and Enhanced Carrier Mobility through Crystallinity Control by Solvent Engineering and Solid State Ligand Exchange

Abstract

The photoluminescence quantum yield (PLQY) and charge carrier mobility of organic-inorganic perovskite QDs were enhanaced by the optimization of crystallinity and surface passivation as well as solid state ligand exchange. The crystallinity of perovskite QDs was deterimined by solvent field responsibility (Esol) of various solvents for precipitation. The solvent with high Esol could more quickly countervail the localized field generated by polar sovlent, it causes fast crystallization of dissolved precursor, which results in poor crystallinity. The post ligand adding process and post ligand exchange process increase PLQY of perovskite QDs by reducing non-radiative recombination and density of surface defect states through surface passivation. Especially, post ligand exchage process (PLEP) in solid state improved charge carrier mobility of perovskite QDs in addition to PLQY enhancement. The ligand exchange to short alkyl chain length ligands could improve the packing density of perovskite QDs in film by reducing inter-particle distance between perovskite QDs. The maximum hole mobility of 6.2x10-3 cm2·V-1·s-1, one order higher than that of pristine QDs without PLEP, is obtained at perovskite QDs with hexyl ligands. By using PLEP treatment,compared to pristine device, 2.5 times higher current efficiency in perovskite QDs-LED was achieved due to the improved charge carrier mobility and PLQY.

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Publication details

The article was received on 29 Jan 2018, accepted on 23 Apr 2018 and first published on 25 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR00806J
Citation: Nanoscale, 2018, Accepted Manuscript
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    Organic-Inorganic Hybrid Perovskite Quantum Dots with High PLQY and Enhanced Carrier Mobility through Crystallinity Control by Solvent Engineering and Solid State Ligand Exchange

    J. W. Choi, H. Woo, X. Huang, W. Jung, B. Kim, S. Jeon, S. Yim, J. Lee and C. Lee, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00806J

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