We exploit TiO2 surface functionalization as a tool to induce the crystallization process of CH3NH3PbI3-xClx 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.
|Titolo:||Implications of TiO2 surface functionalization on polycrystalline mixed halide perovskite films and photovoltaic devices|
|Data di pubblicazione:||2015|
|Citazione:||Implications of TiO2 surface functionalization on polycrystalline mixed halide perovskite films and photovoltaic devices / Guerra VLP; Altamura D; Trifiletti V; Colella S; Listorti A; Giannuzzi R; Pellegrino G; Condorelli G; Giannini C; Gigli G; Rizzo A. - In: JOURNAL OF MATERIALS CHEMISTRY. A. - ISSN 2050-7488. - 3:41(2015), pp. 20811-20818.|
|Appare nelle tipologie:||1.1 Articolo in rivista|