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Structural origin of light emission in germanium quantum dots

DOI: 10.1038/srep07372 DOI Help
PMID: 25487681 PMID Help

Authors: W. Little (University of London) , A. Karatutlu (University of London) , D. Bolmatov (Cornell University) , K. Trachenko (University of London) , A. V. Sapelkin (University of London) , G. Cibin (Diamond Light Source) , R. Taylor (Diamond Light Source) , Fred Mosselmans (Diamond Light Source) , A. J. Dent (Diamond Light Source) , G. Mountjoy (University of Kent)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 4

State: Published (Approved)
Published: December 2014

Open Access Open Access

Abstract: We used a combination of optically-detected x-ray absorption spectroscopy with molecular dynamics simulations to explore the origins of light emission in small (5 nm to 9 nm) Ge nanoparticles. Two sets of nanoparticles were studied, with oxygen and hydrogen terminated surfaces. We show that optically-detected x-ray absorption spectroscopy shows sufficient sensitivity to reveal the different origins of light emission in these two sets of samples. We found that in oxygen terminated nanoparticles its the oxide-rich regions that are responsible for the light emission. In hydrogen terminated nanoparticles we established that structurally disordered Ge regions contribute to the luminescence. Using a combination of molecular dynamics simulations and optically-detected x-ray absorption spectroscopy we show that these disordered regions correspond to the disordered layer a few Å thick at the surface of the simulated nanoparticle.

Subject Areas: Physics

Instruments: B18-Core EXAFS