Implications of TiO2 surface functionalization on polycrystalline mixed halide perovskite films and photovoltaic devices

Guerra, Valentino L. P. and Altamura, Davide and Trifiletti, Vanira and Colella, Silvia and Listorti, Andrea and Giannuzzi, Roberto and Pellegrino, Giovanna and Condorelli, Guglielmo Guido and Giannini, Cinzia and Gigli, Giuseppe and Rizzo, Aurora (2015) Implications of TiO2 surface functionalization on polycrystalline mixed halide perovskite films and photovoltaic devices. Journal of Materials Chemistry A, 3 (41). pp. 20811-20818. ISSN 2050-7488

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Abstract

We exploit TiO2 surface functionalization as a tool to induce the crystallization process of CH3NH3PbI3xClx perovskite thin films resulting in a reduction of the degree of orientation of the (110) crystallographic planes. Notably, the variation of the film crystalline orientational order does not affect the photovoltaic performances of the perovskite-based devices, whose efficiency remains mostly unchanged. Our findings suggest that other factors are more significant in determining the device efficiency, such as the non-homogenous coverage of the TiO2 surface causing charge recombination at the organic/TiO2 interface, defect distribution on the perovskite bulk and at the interfaces, and transport in the organic or TiO2 layer. This observation represents a step towards the comprehension of the perovskite film peculiarities influencing the photovoltaic efficiency for high performance devices.

Item Type: Article
Uncontrolled Keywords: perovskite, solar cells, oriented growth
Subjects: 500 Scienze naturali e Matematica > 500.2 Scienze fisiche
500 Scienze naturali e Matematica > 540 Chimica e scienze connesse
600 Tecnologia - Scienze applicate
Depositing User: Dr Aurora Rizzo
Date Deposited: 26 May 2016 12:56
Last Modified: 26 May 2016 12:56
URI: http://eprints.bice.rm.cnr.it/id/eprint/13730

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