DataVXACS Energy LettersPaper
journal article·2019-01-11Open access

Controlling the Phase Segregation in Mixed Halide Perovskites through Nanocrystal Size

Andrés. F. Gualdrón-Reyes, Seog Joon Yoon, Eva M. Barea, Said Agouram, Vicente Muñoz-Sanjosé, Ángel M. Meléndez, Martha E. Niño-Gómez, Iván Mora-Seró

ACS Energy Letters· Volume 4· Issue 1
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Source abstract

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 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-x I x 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.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Advanced Materials (INAM), University Jaume I, Avenida de Vicent Sos Baynat, s/n, 12006 Castelló de la Plana, Castellón, Spain

Centro de Investigaciones en Catálisis (CICAT), Universidad Industrial de Santander, Sede UIS Guatiguará, Piedecuesta, Santander C.P. 681011, Colombia

Centro de Investigación Científica y Tecnológica en Materiales y Nanociencias (CMN), Universidad Industrial de Santander, Piedecuesta, Santander C.P. 681011, Colombia

Department of Applied Physics and Electromagnetism, University of Valencia, 46100 Valencia, Spain

Funding

Departamento Administrativo de Ciencia, Tecnolog?a e Innovaci?n · Generalitat Valenciana · Universitat Jaume I · European Regional Development Fund · Secretar?a de Estado de Investigaci?n, Desarrollo e Innovaci?n · H2020 European Research Council

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