Journal
NANO LETTERS
Volume 12, Issue 8, Pages 4200-4205Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl301787g
Keywords
Quantum dot; nanocrystal; silicon; pressure; photoluminescence; X-ray diffraction; diamond anvil cell
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-ACO2-06CH11357]
- National Science Foundation
- Earth Sciences [EAR-0622171]
- Department of Energy
- Geosciences [DE-FG02-94ER14466]
- Center for Advanced Solar Photophysics
- Department of Energy, Office of Basic Energy Sciences
- Nonequilibrium Energy Research Center (NERC)
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0000989]
- Energy Frontier Research Center
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A lack of consensus persists regarding the origin of photoluminescence in silicon nanocrystals. Here we report pressure-dependences of X-ray diffraction and photoluminescence from alkane-terminated colloidal particles. We determine the diamond-phase bulk modulus, observe multiple phase transitions, and importantly find a systematic photoluminescence red shift that matches the X-conduction-to-Gamma(valence) transition of bulk crystalline silicon. These results, reinforced by calculations, suggest that the efficient photoluminescence, frequently attributed to defects, arises instead from core-states that remain highly indirect despite quantum confinement.
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