Comment on “Interplay of Structural and Optoelectronic Properties in Formamidinium Mixed Tin‐Lead Triiodide Perovskites”

Studying optoelectronic properties in FAPb1−xSnxI3 and in FA0.83Cs0.17Pb1−xSnxI3 perovskites as a function of the lead:tin content, Parrott et al. (2018) and Savill et al. (2020) observed the broadest luminescence linewidth and the largest Stokes shift in mixed compositions with Sn 85%. It is in con...

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Bibliographic Details
Published in:Advanced functional materials 2022-07, Vol.32 (30), p.n/a
Main Authors: Baranovskii, Sergei D., Höhbusch, Pauline, Nenashev, Alexey V., Dvurechenskii, Anatolii V., Gerhard, Marina, Hertel, Dirk, Meerholz, Klaus, Koch, Martin, Gebhard, Florian
Format: Article
Language:English
Subjects:
alloy perovskites
Alloying effects
bandgap bowing
Composition
disorder effects
Emissions control
Lead
Materials science
Optoelectronics
Perovskites
Photoluminescence
Tin
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Summary:Studying optoelectronic properties in FAPb1−xSnxI3 and in FA0.83Cs0.17Pb1−xSnxI3 perovskites as a function of the lead:tin content, Parrott et al. (2018) and Savill et al. (2020) observed the broadest luminescence linewidth and the largest Stokes shift in mixed compositions with Sn 85%. It is in contrast to the intuitive expectation of the largest effects of alloy disorder for the 50:50 composition. This comment addresses the alloy disorder caused by statistical local spatial fluctuations of the alloy composition and shows that the largest effects of alloy disorder for perfectly random fluctuations in FAPb1−xSnxI3 and FA0.83Cs0.17Pb1−xSnxI3 are, in fact, expected for x < 0.25 and for x > 0.85. It can be one of the reasons why Pb‐rich and Sn‐rich Sn‐Pb perovskites typically show shorter photoluminescence (PL) lifetimes, broader emission, increased Stokes shifts, reduced PL quantum yield, and higher Urbach tails, compared with their lead‐only counterparts.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202201309