Abstract
For the first time, epilayers with an arsenic-doped spike of 50 nm width have been grown and used in silicon bipolar junction transistors (BJTs). The epilayer has been optimized such that the collector-base junction of the BJT is formed within the arsenic spike. The counterdoping of boron out-diffusion by arsenic strongly reduces the basewidth. The portion of the spike that is not counterdoped increases the total amount of n-type doping in the collector without reducing BVceo. The increased collector-doping allows a 60% higher collector current prior to fT fall-off. Arsenic has a low diffusivity so very few constraints are put on the thermal budget of the final process. This high flexibility makes the presented epilayer technology a promising candidate to enhance a bipolar process significantly.
Original language | English |
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Pages (from-to) | 2500-2505 |
Number of pages | 6 |
Journal | IEEE transactions on electron devices |
Volume | 48 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1 Nov 2001 |
Externally published | Yes |
Keywords
- Bipolar transistors
- Semiconductor device doping
- Semiconductor epitaxial layers