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

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Abstract

We exploit TiO2 surface functionalization as a tool to induce the crystallization process of CH3NH3PbI3xClxperovskite 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 photovoltaicperformances of the perovskite-based devices, whose efficiency remains mostly unchanged. Ourfindings suggest that other factors are more significant in determining the device efficiency, such as thenon-homogenous coverage of the TiO2 surface causing charge recombination at the organic/TiO2interface, defect distribution on the perovskite bulk and at the interfaces, and transport in the organic orTiO2 layer. This observation represents a step towards the comprehension of the perovskite filmpeculiarities influencing the photovoltaic efficiency for high performance devices.

Autore Pugliese

Tutti gli autori

  • Guerra V.L.P.; Altamura D.; Trifiletti V.; Colella S.; Listorti A.; Giannuzzi R.; Pellegrino G.; Condorelli G.G.; Giannini C.; Gigli G.; Rizzo A.

Titolo volume/Rivista

Journal of Materials Chemistry A

Anno di pubblicazione

2015

ISSN

2050-7488

ISBN

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Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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