Radiation-induced gain degradation in lateral PNP BJTs with lightly and heavily doped emitters

Technical Report · Sun Jun 01 04:00:00 EDT 1997

DOI:https://doi.org/10.2172/491557· OSTI ID:491557

Wu, A ^[1]; Schrimpf, R D ^[2]; Pease, R L ^[3]; Fleetwood, D M ^[4]; Kosier, S L ^[5]

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1. Univ. of Arizona, Tucson, AZ (United States)
2. Vanderbilt Univ., Nashville, TN (United States)
3. RLP Research, Inc., Albuquerque, NM (United States)
4. Sandia National Labs., Albuquerque, NM (United States)
5. VTC Inc., Bloomington, MN (United States)

Ionizing radiation may cause failures in ICs due to gain degradation of individual devices. The base current of irradiated bipolar devices increases with total dose, while the collector current remains relatively constant. This results in a decrease in the current gain. Lateral PNP (LPNP) transistors typically exhibit more degradation than vertical PNP devices at the same total dose, and have been blamed as the cause of early IC failures at low dose rates. It is important to understand the differences in total-dose response between devices with heavily- and lightly-doped emitters in order to compare different technologies and evaluate the applicability of proposed low-dose-rate hardness-assurance methods. This paper addresses these differences by comparing two different LPNP devices from the same process: one with a heavily-doped emitter and one with a lightly-doped emitter. Experimental results demonstrate that the lightly-doped devices are more sensitive to ionizing radiation and simulations illustrate that increased recombination on the emitter side of the junction is responsible for the higher sensitivity.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 491557
• Report Number(s): SAND--97-0425C; CONF-970711--15; ON: DE97003203
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
EXPERIMENTAL DATA
FAILURES
IONIZING RADIATIONS
JUNCTION TRANSISTORS
PHYSICAL RADIATION EFFECTS
RADIATION DOSES