Not applicable.
The present invention relates to a chuck for supporting a device under test (DUT) in a probe station and, more particularly, to a chuck adapted to testing electrical and optical properties of a DUT at a temperature other than the ambient temperature.
Many electrical devices, in particular semiconductor based devices, include both electrical components and optical components. Some electro-optical devices receive an optical signal from an optical source and convert the received optical signal into an electrical signal, e.g., a photo-detector. Other electro-optical devices convert an electrical signal into an optical signal, e.g., a light-emitting-diode. Yet other electro-optical devices may include multiple optical and/or electrical components. A probe station may be used to characterize the operation of these devices.
In a probe station, an electrical device-under-test (DUT) is commonly supported on and restrained to the upper surface a chuck while probes are positioned above test pads on the upper surface of the DUT and then brought into contact with the test pads during measurement of the device's operating parameters. The chuck is usually supported on a movable stage permitting movement the chuck to facilitate aligning the probes with the test pads of the DUT. However, an electro-optical device commonly includes electrical connections on a first surface of the device and optical input or output at another surface of the device. For example, an optical signal from a light source may be directed toward the DUT from below, above, or to the side of the DUT while a probe or connector on the upper surface is used to sense the resulting electrical output from the DUT. Similarly for example, a probe or connector may be used to provide an electrical excitation at the upper surface of the DUT while an optical sensor located below, above, or to the side of the DUT is used to sense the resulting optical output.
An optical chuck may used in a probe station to support a DUT that requires an optically accessible path to a surface of the DUT that is normally blocked by the chuck. Harris et al., Patent Application Publication, Pub. No.: US 2003/0042889 A1, incorporated herein by reference, disclose an optical chuck that includes a central, optically transparent medium over which the DUT is supported to provide an optically accessible path to all sides of the DUT. The DUT and the optically transparent medium are supported above a base by a plurality of columnar supports permitting an optical transducer to be located below the transparent window to either sense optical output from the DUT or transmit optical signals to the DUT from below.
While an optical chuck provides an access path for optical signals to or from a DUT, it is often desired to test these devices at a temperature other than the ambient temperature. Thermal chucks are commonly used for testing electrical DUTs at elevated or depressed temperatures. A thermal chuck typically includes a heat source to raise the temperature of the surface of the chuck supporting the DUT and, as a result, the temperature of the DUT. Typically, probe station thermal chucks are heated by thermoelectric devices that rely on the Peltier effect or wire resistance heaters. However, these devices are optically opaque and would interfere with an optical path to the DUT if used to modify the temperature of an optical chuck.
What is desired, therefore, is a thermal optical chuck for use in a probe station that permits a DUT supported on a surface of the chuck to be tested at a temperature other than ambient while providing optical access to the underside the DUT.
Testing devices having electrical and optical components involves applying measured electrical or optical inputs and measuring electrical or optical outputs. The electrical inputs and outputs are typically applied and measured by instruments connected to the device by connectors and/or conductive probes and the optical inputs and outputs are typically determined by optical sensors optically coupled to the device. The overall operational characteristics of the device may be characterized from the outputs to the various instruments when the device-under-test (DUT) is electrically and/or optically excited. Often the electrical and optical inputs and outputs to a DUT are arranged on different surfaces of the device. For example, a device may have test pads for electrical excitation located on a first (upper) surface while an optical output is directed from the opposing (lower) surface. An optical chuck provides an optically accessible path to the lower surface of a DUT so that an optical transducer may be positioned below the DUT to either expose the lower surface of the DUT to an optical input or intercept an optical output from the lower surface of the DUT while the upper surface of the DUT is accessible to probes or connectors for making electrical connections.
However, it is often desirable to characterize the DUT at an elevated temperature to simulate the environment in which the device will be used or to determine its performance under operating conditions that stress the device. While an optical chuck provides an accessible optical path to the lower surface of a DUT, the heating devices normally used to modify the temperature of probe station chucks are optically opaque and would interfere with optical access to the DUT if placed in the optical path. The inventor concluded that a thermal optical chuck having an optically transparent heating device could provide a combination of optical accessibility to the lower surface of the DUT and the ability to modify the temperature of the DUT.
Referring in detail to the drawings where similar parts of the invention are identified by like reference numerals, and referring in particular to
The thermal optical chuck 22 comprises a transparent plate 36 supported by the frame 28 that is, in turn, supported above the base 24 by the supports 26. The transparent plate 36 may comprise one or more of a variety of commercially available materials; such as, glass, quartz, sapphire, lithium niobate, and fused silica that are transparent to one or more wavelengths of interest for a particular DUT.
The temperature of the transparent plate 36 and a DUT 30 supported on the transparent plate is modified by passing an electrical current through a transparent resistor 38 deposited over an area 40 of a surface of the plate. The transparent resistor 38 may comprise any electrical conductor which is transparent to an optical wavelength of interest and which exhibits an appropriate resistance. For example, the transparent resistor may comprise indium tin oxide (ITO), silver-zinc oxide, antimony-tin oxide or a conductive polymer, such as poly(ethylenedioxythiophene) (PEDOT) or doped polyaniline. Referring to
An electrical potential is applied to the transparent resistor 38 through leads 42, 44 conductively connected, respectively, to bus bars 46, 48 arranged along opposing edges of the area 40 of the deposited transparent resistor and conductively connected to the resistor. When a potential is applied at the bus bars 46, 48, current flows, from a current source 50, through the deposited layer of conductive transparent resistor material producing heat in proportion to the resistance and square of the current, as expressed by the equation:
P=I2R
The resistance of a conductor is a function of the intrinsic resistance or resistivity of the material, the cross-sectional area of the conductor, and the length of the conductor. In a preferred embodiment, the material of the transparent resistor 38 is deposited to a uniform depth over an area 40 that is rectangular and, even more preferably, square. Parallel bus bars 42, 44 in conductive contact with the resistor material provide a current path of uniform length over the length of the bus bars, promoting uniform heating over the area 40 of the transparent resistor 38. Since many of the DUTs tested in probe stations are circular wafers, a transparent resistor deposited over a square area can provide uniform heating over the surface of the DUT while minimizing the cross-sectional area of the conductive path through resistor material of a particular depth. However, the depth of the transparent resistor material, the shape of the area 40 over which the material is deposited, and the shape and placement of the bus bars 42, 44 can be manipulated to produce uniform or non-uniform heating or a heated area of another shape, as may be required.
During testing, DUTs are commonly restrained on the top surface of a chuck by air pressure. A plurality of apertures 52 in the top surface of the transparent plate 36 of the thermal optical chuck 22 is selectively connectible to a vacuum source 54 and arranged so that when the DUT 30 placed on the surface it will block air flow to the apertures. When the blocked apertures are connected to the vacuum source 52, air pressure acts on the surface of the DUT 30 to hold the DUT in place on the surface of the chuck. Apertures 52 in the upper surface of the thermal optical chuck 22 are connected to a valve (not illustrated) that selectively connects the apertures to the vacuum source 54 by transparent piping 56, to minimize impact on the optical path 34.
However, even transparent piping connecting a vacuum source a plurality of spaced apertures in the transparent plate 36 can interfere with optical access to the bottom of the DUT 30. Referring to
The thermal optical chuck permits a DUT supported on the surface of the chuck to be tested at a temperature other than ambient while providing optical access to the underside the DUT.
The detailed description, above, sets forth numerous specific details to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. In other instances, well known methods, procedures, components, and circuitry have not been described in detail to avoid obscuring the present invention.
All the references cited herein are incorporated by reference.
The terms and expressions that have been employed in the foregoing specification are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding equivalents of the features shown and described or portions thereof, it being recognized that the scope of the invention is defined and limited only by the claims that follow.
This application is a continuation of U.S. patent application Ser. No. 11/123,687, filed May 6, 2005, now U.S Pat No. 7,176,705 B2; which application claims the benefit of U.S. Provisional App. No. 60/577,752, filed Jun. 7, 2004.
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Number | Date | Country | |
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Number | Date | Country | |
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Parent | 11123687 | May 2005 | US |
Child | 11607331 | US |