The effect of sodium doping in NiO as a contact layer for perovskite solar cells is investigated. A combined X-ray diffraction and X-ray photoelectron spectroscopy analysis reveals that Na+ mostly segregates as NaOx/NaCl species around NiO crystallites, with the effect of reducing interface capacitance as revealed by impedance spectroscopy. Inspired by this finding, the NiO/perovskite interface in perovskite solar cells is modified via insertion of an ultrathin NaCl interlayer, which increases the NiO work-function by 0.3 eV. This leads to an increase of power conversion efficiency, approaching 18%, and open-circuit voltage due to a remarkable suppression of surface recombination, as revealed by photoluminescence analysis and light intensity–dependent electrical measurements.

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface / Di Girolamo, D.; Phung, N.; Jost, M.; Al-Ashouri, A.; Chistiakova, G.; Li, J.; Marquez, J. A.; Unold, T.; Korte, L.; Albrecht, S.; Di Carlo, A.; Dini, D.; Abate, A.. - In: ADVANCED MATERIALS INTERFACES. - ISSN 2196-7350. - 6:17(2019), p. 1900789. [10.1002/admi.201900789]

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

Di Carlo A.;Abate A.
2019

Abstract

The effect of sodium doping in NiO as a contact layer for perovskite solar cells is investigated. A combined X-ray diffraction and X-ray photoelectron spectroscopy analysis reveals that Na+ mostly segregates as NaOx/NaCl species around NiO crystallites, with the effect of reducing interface capacitance as revealed by impedance spectroscopy. Inspired by this finding, the NiO/perovskite interface in perovskite solar cells is modified via insertion of an ultrathin NaCl interlayer, which increases the NiO work-function by 0.3 eV. This leads to an increase of power conversion efficiency, approaching 18%, and open-circuit voltage due to a remarkable suppression of surface recombination, as revealed by photoluminescence analysis and light intensity–dependent electrical measurements.
2019
From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface / Di Girolamo, D.; Phung, N.; Jost, M.; Al-Ashouri, A.; Chistiakova, G.; Li, J.; Marquez, J. A.; Unold, T.; Korte, L.; Albrecht, S.; Di Carlo, A.; Dini, D.; Abate, A.. - In: ADVANCED MATERIALS INTERFACES. - ISSN 2196-7350. - 6:17(2019), p. 1900789. [10.1002/admi.201900789]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/829275
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