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Dimensional crossover in semiconductor nanostructures
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DOI：10.1038/ncomms12726.png)
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摘要
En 中文
Recent advances in semiconductor nanostructure syntheses provide unprecedented control over electronic quantum confinement and have led to extensive investigations of their size-and shape-dependent optical/electrical properties. Notably, spectroscopic measurements show that optical bandgaps of one-dimensional CdSe nanowires are substantially (approximately 100 meV) lower than their zero-dimensional counterparts for equivalent diameters spanning 5-10 nm. But what, exactly, dictates the dimensional crossover of a semiconductor's electronic structure? Here we probe the one-dimensional to zero-dimensional transition of CdSe using single nanowire/nanorod absorption spectroscopy. We find that carrier electrostatic interactions play a fundamental role in establishing dimensional crossover. Moreover, the critical length at which this transition occurs is governed by the aspect ratio-dependent interplay between carrier confinement and dielectric contrast/confinement energies.
Keyword:
CDSE QUANTUM DOTS
ASSIGNMENT
TRANSITION
EXCITON
WIRE
RODS
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期刊
IF:
15.7
论文数:
9.4W
被引数:
91.2W
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