Bias and readout for multicolor quantum well detectors

Details Bias and readout for multicolor quantum well detectors Bias and readout for multicolor quantum well detectors

1994-09-15

1996-09-03

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

25033902, 25037012, 257 21, 257440, H01L 3109, H01L 2915

Patent

active

055526039

ABSTRACT:
A three-color optical detector has independent bias and readout for the colors. The three-color detector includes a substrate and first, second, and third detector layers stacked one on top of another and the substrate. Each detector layer is designed to operate at a respective predetermined bias and to absorb incident light having wavelengths in a respective range. A plurality of conductive layers are interleaved among the three detector layers and the substrate in such a way that the respective biasses can be applied to the detector layers and signals generated by the detector layers can be accessed. A two-dimensional array of such three-color optical detectors is also described that is connected to an electronic device, such as a multiplexer, for applying the predetermined biasses and reading out the signals. The electronic device is disposed on a separate substrate and is electrically connected to the detectors on a pixel-by-pixel basis by a set of metallic bump bonds. The separate substrate includes a conducting metallization pattern for electrically connecting to predetermined ones of the conductive layers of the three-color detectors.

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C. Weisbuch et al., Quantum Semiconductor Structures, pp. 11-100, Academic press, Inc., San Diego, Calif. (1991).
L. West et al., "First Observation of an Extremely Large-Dipole Infrared Transition with the Conduction Band of GaAs Quantum Well," Appl. Phys. Lett., vol. 46, No. 12, pp. 1156-1158 (Jun. 15, 1985).

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