Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 41, Pages 20811-20818Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05220c
Keywords
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Funding
- Progetto di ricerca PON R&C MAAT-Molecular NAnotechnology for HeAlth and EnvironmenT [713/Ric, PON02_00563_3316357]
- EFOR-Energia da FOntiRinnovabili (Iniziativa CNR per il Mezzogiorno) [L. 191/2009]
- Regione PUGLIA (APQ Reti di Laboratorio, project PHOEBUS) [31]
- Beyond-Nano [PON03_00362]
- Bando SIR MIUR Decreto Direttoriale 23 gennaio [197, RBSI14-FYVD]
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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.
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