3-D analysis of semiconductor dopant distributions in a patterned structure using LEAP
This work presents the first 3-D analysis of lateral dopant diffusion in a patterned structure using a pulsed laser-assisted local electrode atom probe (LEAP). A structure similar to a device channel was created for this work by performing a 3 keV, 1×10 15 cm −2 As + implant on a poly-Si line patter...
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| Published in: | Ultramicroscopy 2008-05, Vol.108 (6), p.536-539 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | This work presents the first 3-D analysis of lateral dopant diffusion in a patterned structure using a pulsed laser-assisted local electrode atom probe (LEAP). A structure similar to a device channel was created for this work by performing a 3
keV, 1×10
15
cm
−2 As
+ implant on a poly-Si line patterned wafer with 70
nm line width and 200
nm line pitch. The wafer was subsequently annealed at 950
°C for 1
s. LEAP samples were made using a site-selective in-situ focused ion beam (FIB) process. The results from LEAP analysis were then compared with high-resolution transmission electron microscopy (HRTEM) and Florida object-oriented process simulator (FLOOPS) results. Good structural agreement was found between the LEAP and HRTEM results. Several 1-D As concentration profiles extracted from the LEAP data were also found to be in good agreement with FLOOPS process simulation results. These profiles also represent for the first time that results from a 3-D process simulator have been able to be confirmed experimentally using a single sample. |
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| ISSN: | 0304-3991 1879-2723 |