On the Contribution of Bulk Defects on Charge Pumping Current

Published

October 1, 2012

Author(s)

Jason T. Ryan, Richard G. Southwick, Jason P. Campbell, Kin P. Cheung, John S. Suehle

Abstract

Frequency dependent charge pumping (FD-CP) has emerged as a popular technique for studying the spatial and energetic distribution of defect centers in advanced high-k gate stacks. However, conflicting interpretations of the charge pumping frequency - defect depth relationship has led to controversial and inconsistent findings between various groups. A key assumption is that most, if not all, bulk defect trapping/detrapping contributes to the charge pumping current. In this study, we show, experimentally using two independent measurements, that there is a large discrepancy between the total amount of bulk defect trapping/detrapping that occurs and the actual charge pumping contribution due to these defects. We argue that the charge pumping current due to bulk defects depends heavily upon the specific device geometry/technology, the minority carrier lifetime, and FD-CP’s general inability to function as a defect profiling tool.

Citation

IEEE Transactions on Electron Devices

Pub Type

Journals

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Citation

Ryan, J. , Southwick, R. , Campbell, J. , Cheung, K. and Suehle, J. (2012), On the Contribution of Bulk Defects on Charge Pumping Current, IEEE Transactions on Electron Devices, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911823 (Accessed October 16, 2025)