Excimer laser doping using highly doped silicon nanoparticles

Laser doping of crystalline Si (c‐Si) using highly doped Si nanoparticles (NPs) as the dopant source is investigated. For this purpose Si NPs are deposited onto c‐Si substrates from dispersion using a spin coater and subsequently laser annealed by scanning over the sample with a 248 nm line profile...

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Bibliographic Details
Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2013-11, Vol.210 (11), p.2456-2462
Main Authors: Meseth, Martin, Kunert, Bernd Christian, Bitzer, Lucas, Kunze, Frederik, Meyer, Sebastian, Kiefer, Fabian, Dehnen, Martin, Orthner, Hans, Petermann, Nils, Kummer, Malin, Wiggers, Hartmut, Harder, Nils-Peter, Benson, Niels, Schmechel, Roland
Format: Article
Language:English
Subjects:
Annealing
Doping
Excimer lasers
laser doping
Lasers
Nanoparticles
Scanning electron microscopy
Silicon
Silicon substrates
solar cells
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Summary:Laser doping of crystalline Si (c‐Si) using highly doped Si nanoparticles (NPs) as the dopant source is investigated. For this purpose Si NPs are deposited onto c‐Si substrates from dispersion using a spin coater and subsequently laser annealed by scanning over the sample with a 248 nm line profile excimer laser. Scanning electron microscope (SEM) investigations demonstrate that the laser intensity as well as the oxide concentration in the NP thin film strongly influence the film forming properties of the annealed NPs. Substrate doping is substantiated using electrochemical capacitance voltage (ECV) measurements on realized pn‐junctions. In dependence of the laser fluencies ranging from 0.81 to 2.54 J cm−2, the effective doping depth is determined to be in the range of 50 to 250 nm. The rectifying behaviour of the pn‐ or np‐junctions is verified by current voltage measurements. A homogeneous in‐plane doping distribution realized by the laser doping process is demonstrated on the µm scale by light beam induced current measurements.
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.201329012