期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 8, 页码 4860-4868出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c11217
关键词
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资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [801847]
- Olle Engkvist foundation
- NanoLund
- Marie Sklodowska Curie Actions Cofund [INCA 600398]
- Swedish Foundation for Strategic Research
- China Scholarship Council (CSC) [201608530162]
- Vetenskapsradet [2018-05014]
- Swedish Research Council [2018-05014] Funding Source: Swedish Research Council
This study demonstrates the low-temperature solution growth of vertically aligned CsPbBr3 nanowire arrays in AAO templates, showing excellent stability and optoelectronic performance. CsPbBr3 nanowires of different diameters exhibit different crystal structures and photoluminescence behaviors.
Metal halide perovskites show great promise for a wide range of optoelectronic applications but are plagued by instability when exposed to air and light. This work presents low-temperature solution growth of vertically aligned CsPbBr3 nanowire arrays in AAO (anodized aluminum oxide) templates with excellent stability, with samples exposed to air for 4 months still exhibiting comparable photoluminescence and UV stability to fresh samples. The single-crystal nanowire length is adjusted from similar to 100 nm to 5 mu m by adjusting the precursor solution amount and concentration, and we observe length-to-diameter ratios as high as 100. Structural characterization results indicate that large-diameter CsPbBr3 nanowires have an orthorhombic structure, while the 10 nm- and 20 nm-diameter nanowires adopt a cubic structure. Photoluminescence shows a gradual blue-shift in emission with decreasing nanowire diameter and marginal changes under varying illumination power intensity. The CsPbBr3-nanowires/AAO composite exhibits excellent resistance to X-ray radiation and long-term air storage, which makes it promising for future optoelectronic applications such as X-ray scintillators. These results show how physical confinement in AAO can be used to realize CsPbBr3 nanowire arrays and control their morphology and crystal structure.
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