Phase control in mixed halide methylammonium lead perovskites using silicon nanotube templates

Roberto Gonzalez-Rodriguez, Neta Arad-Vosk, Amir Sa'ar, Jeffery L. Coffer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Mixed halide perovskite nanostructures of composition CH3NH3PbI3-xBrx (x = 0, 0.25, 0.50, 0.75, and 3) and inner diameter (ID = 30, 70, and 200 nm) using silicon nanotube (SiNT) templates are described. For a given composition, the photoluminescence (PL) of these mixed halide perovskites is compared to that of bulk perovskite microwires/microcubes. Interestingly, for CH3NH3PbI2.25Br0.75 formed within these NTs, precise control of the cubic phase of this perovskite is maintained over time, as monitored by X-ray diffraction up to 21 days; this behavior is in stark contrast to the microwire, nontemplated structure of the same composition, which reverts to the tetragonal phase during this period. For the 70 and 200 nm ID templates, these NTs also provide some stabilization and effective packaging of the perovskite with regard to crystallinity and PL intensity over this time period.

Original languageAmerican English
Pages (from-to)20040-20045
Number of pages6
JournalJournal of Physical Chemistry C
Volume122
Issue number34
DOIs
StatePublished - 30 Aug 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

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