1. Implications of TiO2 surface functionalization on polycrystalline mixed halide perovskite films and photovoltaic devices
- Author
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Guerra, V, Altamura, D, Trifiletti, V, Colella, S, Listorti, A, Giannuzzi, R, Pellegrino, G, Condorelli, G, Giannini, C, Gigli, G, Rizzo, A, Guerra, VLP, Condorelli, GG, Guerra, V, Altamura, D, Trifiletti, V, Colella, S, Listorti, A, Giannuzzi, R, Pellegrino, G, Condorelli, G, Giannini, C, Gigli, G, Rizzo, A, Guerra, VLP, and Condorelli, GG
- Abstract
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.
- Published
- 2015