Patent
Product wafer junction leakage measurement using corona and a kelvin probe
Roger L. Verkuil
- 05 Aug 1997
89
TL;DR: In this article, the authors applied the Corona charge to a semiconductor product wafer to reverse bias PN junctions and measured voltage decay in the dark and in the light to determine a PN junction leakage characteristic.
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Abstract: Corona charge is applied to a semiconductor product wafer to reverse bias PN junctions. Measurements of voltage decay in the dark and in the light are made and combined to determine a PN junction leakage characteristic. A portion of the dark measurement is taken in the light to permit normalizing the light and dark measurements.
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Citations
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References
Patent
Contactless technique for semicondutor wafer testing
Huntington W. Curtis,Min-Su Fung,Roger Leonard Verkuil +2 more
- 26 Aug 1987
TL;DR: In this article, a contactless technique for semiconductor wafer testing comprising of depositing charges on the top surface of an insulator layer over the wafer to create an inverted surface with a depletion region and thereby a field-induced junction there below in the waf, with an accumulated guard ring on the semiconductor surface there around.
125
Patent
Contactless electrical thin oxide measurements
Roger Leonard Verkuil
- 12 May 1995
TL;DR: In this article, a method for measuring the thickness of very thin oxide layers on a silicon substrate is proposed, where a corona discharge source repetitively deposits a calibrated fixed charge density on the surface of the oxide and the resultant change in oxide surface potential for each charge deposition is measured.
111
Patent
Contactless technique for measuring epitaxial dopant concentration profiles in semiconductor wafers
Roger Leonard Verkuil
- 08 Oct 1991
TL;DR: In this article, the dopant concentration of a semiconductor wafer is determined using a contactless technique, where a temporary P-N junction is formed in the surface of the wafer using corona discharge and the area of the junction is measured, and the depletion region is collapsed using light, and as depletion region collapses, the surface potential is measured as a function of time.
51
Patent
Contactless corona-oxide-semiconductor Q-V mobile charge measurement method and apparatus
Roger Leonard Verkuil,Min-Su Fung +1 more
- 30 Dec 1994
TL;DR: In this article, a method and apparatus comprises heating a wafer to a temperature sufficient to temperature stress the wafer and enable ion motion, where the wafers are initialized in a measurement region with a non-contact corona discharge of a first polarity until a first dielectric field is developed, wherein any mobile ions present in the surface or at an interface move to a substrate/dielectric interface.
48
Patent
Current attenuator useful in a very low leakage current measuring device
Shashi Dhar Malaviya,Daniel Peter Morris +1 more
- 24 Apr 1986
TL;DR: In this paper, an attenuator with a plurality of current dividers coupled in cascade is described, and the leakage current is equal to the known current entering the differential amplifier less the measured current divided by m, the attenuation provided by the attenuators.
47
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