Measuring Bulk Lifetime
First Claim
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1. A method comprising:
- electromagnetically coupling a substrate into an inductance-capacitance resonant circuit formed from (i) a member comprising a ferromagnetic material, (ii) an inductor and (iii) the substrate;
illuminating the substrate for a first time period X to cause photoconduction in the substrate;
measuring decay in conductivity of the substrate for a second time period Y, wherein a ratio of X to Y is greater than 1;
10; and
determining bulk lifetime of the substrate from the decay.
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Abstract
A substrate is electromagnetically coupled into an inductance-capacitance resonant circuit formed from (i) a member comprising a ferromagnetic material, (ii) an inductor and (iii) the substrate. The substrate is illuminated for a first time period X to cause photoconduction in the substrate. Decay in conductivity of the substrate is monitored for a second time period Y. The ratio of X to Y is greater than 1:10. Bulk lifetime of the substrate is determined from the decay.
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Citations
20 Claims
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1. A method comprising:
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electromagnetically coupling a substrate into an inductance-capacitance resonant circuit formed from (i) a member comprising a ferromagnetic material, (ii) an inductor and (iii) the substrate; illuminating the substrate for a first time period X to cause photoconduction in the substrate; measuring decay in conductivity of the substrate for a second time period Y, wherein a ratio of X to Y is greater than 1;
10; anddetermining bulk lifetime of the substrate from the decay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a member comprising a ferromagnetic material, the member including a post disposed at its center and a surface extending to an outer wall, the member defining a gap between the post and the outer wall; an inductance-capacitance resonant circuit configured to resonate at a measurement frequency, the circuit including an inductor disposed relative to the post; a substrate disposed relative to the member, the substrate electromagnetically coupled to the inductor; at least one radiation source configured to illuminate the substrate; and a controller configured to (i) illuminate the substrate with the at least on radiation source for a first time period X to cause photoconduction in the substrate, (i) monitor decay in conductivity of the substrate for a second time period Y, wherein a ratio of X to Y is greater than 1;
10, and (iii) determine bulk lifetime of the substrate from the decay. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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means for electromagnetically coupling a substrate into an inductance-capacitance resonant circuit formed from (i) a member comprising a ferromagnetic material, (ii) an inductor and (iii) the substrate; means for illuminating the substrate for a first time period X to cause photoconduction in the substrate; means for measuring decay in conductivity of the substrate for a second time period Y, wherein a ratio of X to Y is greater than 1;
10; andmeans for determining bulk lifetime of the substrate from the decay.
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Specification