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Methylamine lead bromide perovskite/protonated graphitic carbon nitride nanocomposites: interfacial charge carrier dynamics and photocatalysis

Abstract

We demonstrated the decoration of methylamine lead bromide (MAPbBr3, MA: CH3NH3+) perovskite nanoparticles on protonated graphitic carbon nitride (p-g-C3N4) sheets to form the nanocomposites (NCs) for the first time. The intrinsic type II band structure of MAPbBr3/p-g-C3N4 NC resulted in a significant charge separation property, which was a great benefit to apply it in the related photoelectric conversions. The interfacial charge transfer behavior of MAPbBr3/p-g-C3N4 NCs was analyzed through time-resolved photoluminescence (TRPL) spectroscopy and singular value decomposition global fitting (SVD-GF), which revealed that the photoexcited electron in the conduction band (CB) and shallow trap (ST) states of MAPbBr3 could transfer into the CB of g-C3N4. The fitting results of TRPL traces indicated that controlling their related compositions could modulate the interfacial charge carrier dynamics of MAPbBr3/g-C3N4 NCs. The increased charge transfer rate constant (ket) of MAPbBr3/g-C3N4 NC was discovered when the constituent ratio of p-g-C3N4 was enhanced. Furthermore, we practically utilized MAPbBr3/p-g-C3N4 NC as the photocatalyst to carry out the photocatalytic reduction of p-nitrophenol (PNP) under visible light irradiation. The significant photo-reduction rate (kPNP) of PNP was observed in the photocatalytic reaction, which indicated that, the great potential of MAPbBr3/p-g-C3N4 NCs to convert solar energy into chemical energy. More importantly, the present investigation opens a new field for organolead bromide perovskite in the application of photocatalysis as well as the related photoelectrical conversions.

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Publication details

The article was received on 16 Sep 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08190A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Methylamine lead bromide perovskite/protonated graphitic carbon nitride nanocomposites: interfacial charge carrier dynamics and photocatalysis

    Y. Pu, H. Fan, T. Liu and J. Chen, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08190A

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