Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 45, Pages 39602-39609Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12048
Keywords
2D halide perovskite; ultrasonic-assisted treatment; dimensionality construction; low-dimensional CsPbBr3; optoelectronic properties
Funding
- National Key Basic Research Program of China [2014CB931702]
- NSFC [51572128, 21403109, 51502139]
- NSFC-RGC [5151101197]
- National Key Research and Development Program of China [2016YFB0401701]
- Fundamental Research Funds for the Central Universities [30915012205, 30916015106]
- Natural Science Foundation for Youths of Jiangsu Province of China [BK20140787]
- PAPD of Jiangsu Higher Education Institutions
- USA by DoD [W911NF-15-1-0650]
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Low-dimensional halide perovskite (HP) has triggered lots of research attention in recent years due to anisotropic optoelectronic/semiconducting properties and enhanced stability. High-quality low-dimensional HPs via controllable engineering are required to fulfill the encouraging promise for device applications. Here, we introduce, for the first time, postsynthetic ultrasonic-assisted refinement of two-dimensional homologous HPs (OA(2)PbBr(4), OA is octadecylamine). The solution-prepared OA(2)PbBr(4), either in the form of large-sized microcrystal or nanosheet, obtains significantly enhanced crystallinity after ultrasonic treatment. We further show that OA(2)PbBr(4) nanosheets can be used as a template to construct low -dimensional CsPbBr3 with the size and morphology inherited. Importantly, we found the ultrasonic-treated OA(2)PbBr(4) crystals, compared with pristine ones, lead to enhanced optoelectronic properties for the resultant low -dimensional CsPbBr3, as demonstrated by improved photodetection performances, including prolonged charge-carrier lifetime, improved photostability, increased external quantum yield/responsivity, and faster response speed. We believe this work provides novel engineering of low-dimensional HPs beyond the reach of straightforward synthesis.
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