期刊
NANO LETTERS
卷 16, 期 5, 页码 2958-2962出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04901
关键词
Carbon nanotube; photoluminescence spectroscopy; exciton localization
类别
资金
- European Research Council under the ERC [336749]
- German Excellence Initiative via the Nanosystems Initiative Munich (NIM)
- Center for NanoScience (CeNS)
- LMUinnovativ
- European Research Council (ERC) [336749] Funding Source: European Research Council (ERC)
We present photoluminescence studies of individual semiconducting single-wall carbon nanotubes at room and cryogenic temperatures. From the analysis of spatial and spectral features of nanotube photoluminescence, we identify characteristic signatures of unintentional exciton localization. Moreover, we quantify the energy scale of exciton localization potentials as ranging from a few to a few tens of millielectronvolts and stemming from both environmental disorder and shallow covalent side-wall defects. Our results establish disorder-induced crossover from the diffusive to the localized regime of nanotube excitons at cryogenic temperatures as a ubiquitous phenomenon in micelle-encapsulated and as-grown carbon nanotubes.
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