期刊
ACS NANO
卷 13, 期 4, 页码 4538-4547出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b00274
关键词
hexagonal boron nitride; super-resolution; semiconductor defects; single-molecule microscopy; 2D materials; multidimensional super-resolution; spectroscopy
类别
资金
- Trinity College, Cambridge
- EPSRC Doctoral Training Award [EP/M506485/1]
- EPSRC Doctoral Training Centre in Graphene Technology [EP/L016087/1]
- EPSRC Cambridge NanoDTC [EP/L015978/1]
- Royal Society [UF120277]
- European Union's Horizon 2020 research and innovation program [785219]
Hexagonal boron nitride (h-BN) is a 2D, wide band gap semiconductor that has recently been shown to display bright room-temperature emission in the visible region, sparking immense interest in the material for use in quantum applications. In this work, we study highly crystalline, single atomic layers of chemical vapor deposition grown h-BN and find predominantly one type of emissive state. Using a multidimensional super resolution fluorescence microscopy technique we simultaneously measure spatial position, intensity, and spectral properties of the emitters, as they are exposed to continuous wave illumination over minutes. As well as low emitter heterogeneity, we observe inhomogeneous broadening of emitter line-widths and power law dependency in fluorescence intermittency; this is strikingly similar to previous work on quantum dots. These results show that high control over h-BN growth and treatment can produce a narrow distribution of emitter type and that surface interactions heavily influence the photodynamics. Furthermore, we highlight the utility of spectrally resolved wide-field microscopy in the study of optically active excitations in atomically thin two-dimensional materials.
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