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Open AccessFeature PaperArticle

Understanding the Influence of Interface Morphology on the Performance of Perovskite Solar Cells

1
BCMaterials, Basque Center for Materials, Applications and Nanostructures, Bld. Martina Casiano, UPV/EHU Science Park, Barrio Sarriena, s/n, 48940 Leioa, Spain
2
Abengoa Research, Abengoa, c/Energía Solar no. 1, Campus Palmas Altas, 41014 Sevilla, Spain
3
Area de Química Física, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
4
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2018, 11(7), 1073; https://doi.org/10.3390/ma11071073
Received: 23 May 2018 / Revised: 14 June 2018 / Accepted: 17 June 2018 / Published: 25 June 2018
(This article belongs to the Special Issue Novel Photoactive Materials)
In recent years, organo-halide perovskite solar cells have garnered a surge of interest due to their high performance and low-cost fabrication processing. Owing to the multilayer architecture of perovskite solar cells, interface not only has a pivotal role to play in performance, but also influences long-term stability. Here we have employed diverse morphologies of electron selective layer (ESL) to elucidate charge extraction behavior in perovskite solar cells. The TiO2 mesoporous structure (three-dimensional) having varied thickness, and nanocolumns (1-dimensional) with tunable length were employed. We found that a TiO2 electron selective layer with thickness of about c.a. 100 nm, irrespective of its microstructure, was optimal for efficient charge extraction. Furthermore, by employing impedance spectroscopy at different excitation wavelengths, we studied the nature of recombination and its dependence on the charge generation profile, and results showed that, irrespective of the wavelength region, the fresh devices do not possess any preferential recombination site, and recombination process is governed by the bulk of the perovskite layer. Moreover, depending on the type of ESL, a different recombination mechanism was observed that influences the final behavior of the devices. View Full-Text
Keywords: electron transport material; titanium oxide; charge dynamics; metal-halides perovskites electron transport material; titanium oxide; charge dynamics; metal-halides perovskites
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MDPI and ACS Style

Salado, M.; Calió, L.; Contreras-Bernal, L.; Idígoras, J.; Anta, J.A.; Ahmad, S.; Kazim, S. Understanding the Influence of Interface Morphology on the Performance of Perovskite Solar Cells. Materials 2018, 11, 1073.

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