Denny D. Tang, Tze-Chiang Chen, et al.
IEEE Electron Device Letters
Paper
Effect of Off-Axis Implant on the Characteristics of Advanced Self-Aligned Bipolar Transistors
Abstract
This letter discusses the effect of off-axis implant on the characteristics of advanced self-aligned bipolar transistors utilizing a sidewall-spacer technology, Experimental results are presented to show that as a result of offsetting the base profile with respect to the emitter profile due to the sidewall shadowing effect, the 7° off-axis implant causes orientation-dependent perimeter punchthrough at one of the emitter edges and orientation-dependent perimeter tunneling at the other emitter edge. Copyright © 1987 by The Institute of Electrical and Electronics Engineers, Inc.
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