Controlling the Phase Segregation in Mixed Halide Perovskites through Nanocrystal Size
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Other documents of the author: Gualdrón Reyes, Andrés Fabián; YOON, SEOG JOON; Barea, Eva M; Agouram, Said; Muñoz-Sanjosé, Vicente; Meléndez, Ángel M.; Niño-Gómez, Martha E.; Mora-Sero, Ivan
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comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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Title
Controlling the Phase Segregation in Mixed Halide Perovskites through Nanocrystal SizeAuthor (s)
Date
2019Publisher
American Chemical SocietyISSN
2380-8195Bibliographic citation
GUALDRÓN-REYES, Andrés, et al. Controlling the Phase Segregation in Mixed Halide Perovskite through Nanocrystal Size. ACS Energy Letters 2019 4 (1), 54-62Type
info:eu-repo/semantics/articlePublisher version
https://pubs.acs.org/doi/full/10.1021/acsenergylett.8b02207Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Mixed halide perovskites are one of the promising candidates in developing solar cells and light-emitting diodes (LEDs), among other applications, because of their tunable optical properties. Nonetheless, photoinduced ... [+]
Mixed halide perovskites are one of the promising candidates in developing solar cells and light-emitting diodes (LEDs), among other applications, because of their tunable optical properties. Nonetheless, photoinduced phase segregation, by formation of segregated Br-rich and I-rich domains, limits the overall applicability. We tracked the phase segregation with increasing crystalline size of CsPbBr3–xIx and their photoluminescence under continuous-wave laser irradiation (405 nm, 10 mW cm–2) and observed the occurrence of the phase segregation from the threshold size of 46 ± 7 nm. These results have an outstanding agreement with the diffusion length (45.8 nm) calculated also experimentally from the emission lifetime and segregation rates. Furthermore, through Kelvin probe force microscopy, we confirmed the correlation between the phase segregation and the reversible halide ion migration among grain centers and boundaries. These results open a way to achieve segregation-free mixed halide perovskites and improve their performances in optoelectronic devices. [-]
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