Customizing electron confinement in plasma-assembled Si/AlN nanodots for solar cell applications
Huang, S.Y., Arulsamy, A. Das, Xu, M., Xu, S., Cvelbar, U., Mozetic, M., & Ostrikov, K. (2009) Customizing electron confinement in plasma-assembled Si/AlN nanodots for solar cell applications. Physics of Plasmas, 16(12), pp. 123504-1.
Size-uniform Si nanodots (NDs) are synthesized on an AlN buffer layer at low Si(111) substrate temperatures using inductively coupled plasma-assisted magnetron sputtering deposition. High-resolution electron microscopy reveals that the sizes of the Si NDs range from 9 to 30 nm. Room-temperature photoluminescence (PL) spectra indicate that the energy peak shifts from 738 to 778 nm with increasing the ND size. In this system, the quantum confinement effect is fairly strong even for relatively large (up to 25 nm in diameter) NDs, which is promising for the development of the next-generation all-Si tandem solar cells capable of effectively capturing sunlight photons with the energies between 1.7 (infrared: large NDs) and 3.4 eV (ultraviolet: small NDs). The strength of the resulting electron confinement in the Si/AlN ND system is evaluated and justified by analyzing the measured PL spectra using the ionization energy theory approximation.
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|Item Type:||Journal Article|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Copyright Owner:||Copyright 2009 American Institute of Physics|
|Deposited On:||15 Jul 2014 00:01|
|Last Modified:||16 Jul 2014 01:44|
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