Journal
ACS ENERGY LETTERS
Volume 4, Issue 1, Pages 54-62Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b02207
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Funding
- University Jaume I [SOLENPE UJI-B2016-05]
- European Research Council (ERC) [724424]
- Spanish Ministry of Economy, Industry and Competitiveness (MINECO) [TEC2014-60173]
- EU (FEDER) [TEC2014-60173]
- Generalitat Valenciana [Prometeo II 2015/004, Prometeo/2018/098]
- Colciencias
- Universidad Industrial de Santander through the Colciencias project [8836, 110265843664]
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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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