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Open AccessArticle

Nanoparticulate Metal Oxide Top Electrode Interface Modification Improves the Thermal Stability of Inverted Perovskite Photovoltaics

1
Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, Cyprus
2
Department of Materials Science and Technology, University of Crete, 71003 Heraklion, Greece
3
Sara and Moshe Zisapel Nano-Electronic Center, Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1616; https://doi.org/10.3390/nano9111616
Received: 15 October 2019 / Revised: 4 November 2019 / Accepted: 11 November 2019 / Published: 14 November 2019
Solution processed γ-Fe2O3 nanoparticles via the solvothermal colloidal synthesis in conjunction with ligand-exchange method are used for interface modification of the top electrode in inverted perovskite solar cells. In comparison to more conventional top electrodes such as PC(70)BM/Al and PC(70)BM/AZO/Al, we show that incorporation of a γ-Fe2O3 provides an alternative solution processed top electrode (PC(70)BM/γ-Fe2O3/Al) that not only results in comparable power conversion efficiencies but also improved thermal stability of inverted perovskite photovoltaics. The origin of improved stability of inverted perovskite solar cells incorporating PC(70)BM/ γ-Fe2O3/Al under accelerated heat lifetime conditions is attributed to the acidic surface nature of γ-Fe2O3 and reduced charge trapped density within PC(70)BM/ γ-Fe2O3/Al top electrode interfaces. View Full-Text
Keywords: nanoparticulate metal oxides; interfaces; charge traps density; electrodes; impedance spectroscopy; degradation mechanisms; accelerated lifetime; thermal stability; inverted perovskites solar cells nanoparticulate metal oxides; interfaces; charge traps density; electrodes; impedance spectroscopy; degradation mechanisms; accelerated lifetime; thermal stability; inverted perovskites solar cells
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MDPI and ACS Style

Papadas, I.T.; Galatopoulos, F.; Armatas, G.S.; Tessler, N.; Choulis, S.A. Nanoparticulate Metal Oxide Top Electrode Interface Modification Improves the Thermal Stability of Inverted Perovskite Photovoltaics. Nanomaterials 2019, 9, 1616.

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