Engineering TiO2/Perovskite Planar Heterojunction for Hysteresis-Less Solar Cells

Trifiletti, Vanira and Manfredi, Norberto and Listorti, Andrea and Altamura, Davide and Giannini, Cinzia and Colella, Silvia and Gigli, Giuseppe and Rizzo, Aurora (2016) Engineering TiO2/Perovskite Planar Heterojunction for Hysteresis-Less Solar Cells. Advanced Materials Interfaces, 3 (22). pp. 1-8. ISSN 2196-7350

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Hybrid halide perovskite solar cells generally show differences in the power output depending on the voltage sweep direction, an undesired phenomenon termed hysteresis. Although the causes of this behavior have not yet been univocally determined, commonly, hysteresis heavily affects solar cells based on flat TiO2 as electron extracting layer. Herein, it is shown how perovskite material quality has a preeminent impact on hysteresis, and how combined deposition and post-deposition engineered manufacturing could lead to highly efficient and hysteresis-less solar cells, withstanding a planar TiO2-based layout. This methodology relies on solvent engineering during the casting process, leading to an ultra-flat, uniform and thick film ensuring an optimal interface connection with the charge-extracting layer combined with post-deposition thermal and vacuum treatments, which merge the crystalline domains and cure the defects at the grain boundaries. This method allows obtaining perovskite active layer with superior optical properties, explaining the ideal device behavior and performances, therefore, a simple optimization of perovskite processing conditions can efficiently stem hysteresis targeting different device layouts. Power conversion efficiency of 15.4% and reduced hysteresis are achieved.

Item Type: Article
Uncontrolled Keywords: photovoltaics, hybrid halide perovskite, hysteresis, solar cel
Subjects: 500 Scienze naturali e Matematica > 540 Chimica e scienze connesse
Depositing User: Dr Aurora Rizzo
Date Deposited: 08 Mar 2017 12:04
Last Modified: 08 Mar 2017 12:04

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