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Title page for ETD etd-03312014-121311


Type of Document Dissertation
Author Hooten, Nicholas C
Author's Email Address nicholas.c.hooten@vanderbilt.edu
URN etd-03312014-121311
Title Charge Collection Mechanisms in Silicon Devices During High-Level Carrier Generation Events
Degree PhD
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Robert A. Reed Committee Chair
Arthur F. Witulski Committee Member
John A. Kozub Committee Member
Robert A. Weller Committee Member
Ronald D. Schrimpf Committee Member
Keywords
  • SEE
  • single-event effects
  • radiation effects in microelectronics
  • Two-photon absorption laser testing for SEE
  • SEE laser testing
  • device-level current transients
Date of Defense 2014-03-21
Availability unrestricted
Abstract
When ionizing radiation interacts with a semiconductor device, the resulting generation and collection of excess charge carriers can result in a brief transient current at the device terminals. These transient current pulses can negatively impact device and circuit operation, which poses a critical reliability concern for systems where continued, reliable operation is tantamount to success.

A thorough understanding of charge collection mechanisms provides device and circuit designers with the tools to make well-informed decisions about the designs of microelectronic components intended for spaceflight applications and other harsh radiation environments.

In this work, charge collection mechanisms following high-level carrier generation conditions (which could be caused by many heavy ions in the space radiation environment) are investigated using experimental measurements, device-level numerical simulations, and recent theoretical developments. Broadbeam heavy-ion irradiation and backside two-photon absorption laser exposure on several bulk-silicon test structures is used to emphasize the significance of depletion region potential modulation on the overall device response. The device response is measured using high-speed transient capture methods, and, when needed, device-level simulations are used as a means to explain the overall device response.

Key findings reveal that significant modulation of the device depletion region can lead to the saturation of current transient peaks, highly efficient charge-collection processes, and, in cases where multiple junctions are in close proximity, the recovery of the struck junction may lead to a simultaneous response at a nearby junction.

These discussions are primarily focused on the response of a reverse-biased n-well over p-substrate diode, which are commonly found in many semiconductor devices. However, because devices and circuits typically rely on the interaction of multiple semiconductor junctions, the effects of n-well potential modulation on the device-response of a PMOSFET following a high-level carrier generation event is also investigated through both experimental measurements and device-level simulations. Where applicable, these insights are used to inform the development of predictive analytical models for the peak transient current and total collected charge following a high-level carrier generation event.

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