期刊
PHYSICAL REVIEW B
卷 83, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.115319
关键词
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资金
- NSF [ECS-0609249, CHE-0547784]
- Research Corporation
- Notre Dame Radiation Laboratory, DOE Office of Basic Energy Sciences
Carrier dynamics in single CdSe nanowires (NWs) have been studied using various techniques. They include measurements of single wire emission intensities as a function of pump fluence, excitation intensity-dependent emission quantum yields, and excited-state lifetimes. Ensemble transient differential absorption studies of induced bleach dynamics have also been conducted. Results of these studies show superlinear growth of the emission intensity as a function of excitation intensity. This is corroborated by single nanowire emission quantum yields that vary as a function of excitation fluence and range from 0.1% to values over 10%. At the same time, measured emission lifetimes are short (< 100 ps) while the nanowire band-edge bleach persists for over a nanosecond. To explain all of the abovementioned results, a kinetic model that accounts for both the nature of photogenerated carriers within the wires as well as their subsequent recombination dynamics has been developed.
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