Universität zu Köln

Baranovskii, Sergei D., Hoehbusch, Pauline, Nenashev, Alexey V., Dvurechenskii, Anatolii V., Gerhard, Marina, Hertel, Dirk, Meerholz, Klaus, Koch, Martin and Gebhard, Florian (2022). Comment on Interplay of Structural and Optoelectronic Properties in Formamidinium Mixed Tin-Lead Triiodide Perovskites. Adv. Funct. Mater., 32 (30). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1616-3028

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Abstract

Studying optoelectronic properties in FAPb(1-x)Sn(x)I(3) and in FA(0.83)Cs(0.17)Pb(1-x)Sn(x)I(3) 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 FAPb(1-x)Sn(x)I(3) and FA(0.83)Cs(0.17)Pb(1-x)Sn(x)I(3) 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Baranovskii, Sergei D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoehbusch, Pauline UNSPECIFIED UNSPECIFIED UNSPECIFIED Nenashev, Alexey V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dvurechenskii, Anatolii V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerhard, Marina UNSPECIFIED UNSPECIFIED UNSPECIFIED Hertel, Dirk UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Koch, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Gebhard, Florian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-682021
DOI:	10.1002/adfm.202201309
Journal or Publication Title:	Adv. Funct. Mater.
Volume:	32
Number:	30
Date:	2022
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1616-3028
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IODIDE PEROVSKITE; EDGE; BEHAVIOR Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68202