Partially replacing Pb2+ by Mn2+ in hybrid metal halide perovskites: Structural and electronic properties

Davide Bartesaghi, Aniruddha Ray, Junke Jiang, Ricardo K.M. Bouwer, Shuxia Tao, Tom J. Savenije

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Abstract

Tailoring the physical properties of hybrid lead metal halide APbX3 perovskites by means of compositional engineering is one of the key factors contributing to the development of highly efficient and stable perovskite solar cells. While the beneficial effects of partial ionic replacement at the A- and X-sites are largely demonstrated, partial replacement of Pb2+ is less explored. Here, we developed a solution-based procedure to prepare thin films of mixed-metal MAPb1-aMnaI3 perovskites. Although Mn2+ ions have a size that can potentially fit in the B-sites of MAPbI3, using a combination of structural and chemical analysis, we show that only less than 10% of Pb2+ can be replaced by Mn2+. A 3% replacement of Pb2+ by Mn2+ leads to an elongation of the charge carrier lifetimes as concluded from time-resolved PL measurements. However, by analysis of the time-resolved microwave conductance data, we show that the charge carrier mobilities are largely unbalanced, which is in accordance with density functional theory (DFT) calculations indicating that the effective mass of the hole is much higher than that of the electron. Increasing the concentration of Mn2+ in the precursor solution above 10% results in formation of amorphous Mn-rich domains in the film, while the perovskite lattice becomes depleted of Mn2+. These domains negatively affect the charge carrier mobilities and shorten the lifetime of photogenerated carriers. The resulting reduction in charge carrier diffusion lengths will severely limit the photovoltaic properties of solar cells prepared from these mixed metal halide perovskites.

Original languageEnglish
Article number121106
Number of pages12
JournalAPL Materials
Volume6
Issue number12
DOIs
Publication statusPublished - 1 Dec 2018

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Metal halides
Charge carriers
Electronic properties
Structural properties
Carrier mobility
Carrier lifetime
Structural analysis
Perovskite
Density functional theory
Elongation
Solar cells
Physical properties
Lead
Metals
Microwaves
Ions
Thin films
Electrons
Chemical analysis

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Bartesaghi, Davide ; Ray, Aniruddha ; Jiang, Junke ; Bouwer, Ricardo K.M. ; Tao, Shuxia ; Savenije, Tom J. / Partially replacing Pb2+ by Mn2+ in hybrid metal halide perovskites : Structural and electronic properties. In: APL Materials. 2018 ; Vol. 6, No. 12.
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Partially replacing Pb2+ by Mn2+ in hybrid metal halide perovskites : Structural and electronic properties. / Bartesaghi, Davide; Ray, Aniruddha; Jiang, Junke; Bouwer, Ricardo K.M.; Tao, Shuxia; Savenije, Tom J.

In: APL Materials, Vol. 6, No. 12, 121106, 01.12.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Bartesaghi, Davide

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