Balanced change in crystal unit cell volume and strain leads to stable halide perovskite with high guanidinium content
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Other documents of the author: Serafini, Patricio; Gualdrón Reyes, Andrés Fabián; S. Sánchez, Rafael; Barea, Eva M; Masi, Sofia; Mora-Sero, Ivan
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comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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Title
Balanced change in crystal unit cell volume and strain leads to stable halide perovskite with high guanidinium contentAuthor (s)
Date
2022Publisher
Royal Society of ChemistryISSN
2046-2069Bibliographic citation
SERAFINI, Patricio, et al. Balanced change in crystal unit cell volume and strain leads to stable halide perovskite with high guanidinium content. RSC advances, 2022, vol. 12, núm. 50, p. 32630-32639Type
info:eu-repo/semantics/articlePublisher version
https://pubs.rsc.org/en/content/articlelanding/2022/ra/d2ra06473aVersion
info:eu-repo/semantics/publishedVersionAbstract
Up-to-date studies propose that strain in halide perovskites is one of the key factors that determine
a device's efficiency and stability. Here, we show a systematic approach to characterize the
phenomenon in the ... [+]
Up-to-date studies propose that strain in halide perovskites is one of the key factors that determine
a device's efficiency and stability. Here, we show a systematic approach to characterize the
phenomenon in the standard methylammonium lead iodine (MAPbI3) perovskite system by: (i) the
substitution of some MA by guanidinium (Gu); (ii) the incorporation of PbS quantum dot (QD) additives
and (iii) addition of both Gu and PbS at the same time. We studied the effect of these incorporations on
the film strain and crystal cell unit volume, and on the solar cell device efficiency and stability. Gu cations
and PbS QDs affect the strain, the former due to the relatively large dimensions of Gu, and the latter due
to the lattice matching parameters. With the control of Gu and PbS QD content, higher performance and
longer solar cell stability are obtained. We demonstrated that the presence of Gu and PbS QDs alters the
structure of perovskite, in terms of modification of the unit cell volume and strain. The greater size of Gu
cations produces a MAPbI3 unit cell volume expansion as Gu is incorporated, modifying the strain from
compressive to tensile. PbS QDs aid Gu incorporation, producing a unit cell volume expansion. In the
case of 15% mol Gu incorporation, the addition of PbS QDs modifies strain from compressive to tensile,
limiting the deleterious effect. At the same time the unit cell volume is less affected, increasing the solar
cell stability. Our work shows that the control of compressive strain and the unit cell volume expansion
lead to a 50% increase in T80, the time in which the PCE decreases to 80% of its original value,
increasing the T80 value from 120 to 187 days under air conditions. Moreover it highlights the
importance of exploiting not only the control of the strain induced by internal component, the cation,
but also the strain induced by the external component, the QD, associated instead with critical volume
variation of metastable perovskite unit cell volume. [-]
Is part of
RSC advances, 2022, vol. 12, núm. 50, p. 32630-32639Funder Name
European Research Council | Ministerio de Ciencia, Innovación y Universidades | Generalitat Valenciana | Universidad Jaume I
Project code
724424–No-LIMIT | PID2019-107314RB-I00 | CIPROM/2021/078 | DEPE2D UJI-B2019-09 | GRISOLIAP/2019/06
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info:eu-repo/semantics/openAccess
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