APPARATUS FOR MEASURING MINORITY CARRIER LIFETIME AND METHOD FOR USING THE SAME
First Claim
19. An apparatus comprising:
- a ferromagnetic core includinga first portion that defines a gap and is configured to direct therealong a magnetic field established by an inductor coiled around said first portion, such that lateral spreading of the magnetic field outside of said first portion is inhibited, and to direct the magnetic field generally uniformly across the gap; and
a second portion configured to direct the magnetic field therealong and, in conjunction with said first portion, into a closed loop; and
a radiation source integrated into said ferromagnetic core.
3 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for measuring minority carrier lifetime is provided. The apparatus includes a resonant circuit having an inductor and a capacitor and configured to resonate at a measurement frequency. The apparatus also includes a ferromagnetic core having a first portion and a second portion. The first portion defines a gap and can be configured to direct therealong a magnetic field established by the inductor, such that lateral spreading of the magnetic field outside of the first portion is inhibited, and to direct the magnetic field generally uniformly across the gap. The second portion can be configured to direct the magnetic field therealong and, in conjunction with the first portion, into a closed loop. A radiation source can be configured to irradiate an area proximal to the gap defined by the first portion of the ferromagnetic core.
-
Citations
43 Claims
-
19. An apparatus comprising:
-
a ferromagnetic core including a first portion that defines a gap and is configured to direct therealong a magnetic field established by an inductor coiled around said first portion, such that lateral spreading of the magnetic field outside of said first portion is inhibited, and to direct the magnetic field generally uniformly across the gap; and a second portion configured to direct the magnetic field therealong and, in conjunction with said first portion, into a closed loop; and a radiation source integrated into said ferromagnetic core. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A method comprising:
-
providing an apparatus including a resonant circuit including an inductor and a capacitor and configured to resonate at a measurement frequency associated with a measurement frequency voltage across the resonant circuit; a ferromagnetic core including a first portion that defines a gap and is configured to direct therealong a magnetic field established by the inductor, such that lateral spreading of the magnetic field outside of the first portion is inhibited, and to direct the magnetic field generally uniformly across the gap; and a second portion configured to direct the magnetic field therealong and, in conjunction with the first portion, into a closed loop; and a radiation source configured to irradiate an area proximal to the gap defined by the first portion of the ferromagnetic core; electromagnetically coupling a sample into the resonant circuit, a first portion of the sample being disposed in the gap such that a magnetic field established by the inductor extends generally uniformly through the first portion of the sample; adjusting a drive current of the resonant circuit to maintain constant the measurement frequency voltage; and intermittently, at a switching frequency, irradiating the sample in an area proximal to the first portion with radiation configured to cause photoconduction in the sample, the switching frequency being on the order of or lower than the inverse of minority carrier lifetime for the sample. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
-
-
43-1. The apparatus of claim 43, wherein said tubular portion is transparent to radiation emitted from said radiation source.
Specification