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Formation of N-N type heterojunction based tin organic-inorganic hybrid perovskite composites and its function in photocatalytic field

Abstract

MASnI3/TiO2 composites (MA represents CH3NH3+) are prepared via solvothermal method and characterized by various techniques. It indicates that the n-n type heterojunction structures and different ohmic contact interfaces are formed for the composites with different content of MASnI3 and TiO2 before and after calcination, thus resulting different optical and photocatalytic performances. Generally speaking, the N-N type heterojunction play the role in photocatalytic application area through two kinds of mechanisms, which are heterojunction mechanism and Z-type mechanism. The calcined composites that own the better ohmic contact interface mainly follow the Z-type mechanism, which could promote the direct radiative recombination of photogenerated carriers. As a result, the higher luminous intensities and the interface recombination instead of bulk recombination between electrons and holes could be achieved, which improves the photoluminescent and photocatalytic activities of the materials. Moreover, the n-n type heterojunction structure avoids the p-type defect states in some degree, which averts the hydrolysis and oxidation of MASnI3 in atmosphere and enhances the long-term stability of MASnI3/TiO2 composites.

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Publication details

The article was received on 20 Nov 2017, accepted on 08 Feb 2018 and first published on 09 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP07819F
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Formation of N-N type heterojunction based tin organic-inorganic hybrid perovskite composites and its function in photocatalytic field

    W. Zhang, Y. Chen, X. Wang, X. yan, J. Xu and Z. Zeng, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP07819F

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