Albuquerque, NM, United States
Albuquerque, NM, United States

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A multijunction solar cell for a space radiation environment, the multijunction solar cell having a plurality of solar sub-cells arranged in order of decreasing band gap including: a first solar subcell composed of InGaP and having a first band gap, the first solar subcell having a first short circuit current associated therewith; a second solar subcell composed of GaAs and having a second band gap which is less than the first band gap, the second solar subcell having a second short circuit current associated therewith; wherein in a beginning of life state the first short circuit current is less than the second short circuit current such that the AMO conversion efficiency is sub-optimal. However, in an end of life state, the short circuit current are substantially matched, which results in an improved AMO conversion efficiency.


Patent
Emcore Co. | Date: 2015-02-11

A semiconductor device comprising a substrate; a monolithic gain region disposed on the substrate and operable to produce optical gain in response to current injection, including a first electrode over a first portion of the gain region having a first length L_(1), with a first current I_(1 )being applied; and a second electrode over a second portion of the gain region having a second length L_(2), with a second current I_(2 )being applied; wherein I_(1)/L_(1 )is greater than I_(2)/L_(2).


A method of forming a multijunction solar cell including an upper subcell, a middle subcell, and a lower subcell by providing a substrate for the epitaxial growth of semiconductor material; forming a first solar subcell on the substrate having a first band gap; forming a second solar subcell over the first solar subcell having a second band gap smaller than the first band gap; forming a graded interlayer over the second subcell, the graded interlayer having a third band gap greater than the second band gap; forming a third solar subcell over the graded interlayer having a fourth band gap smaller than the second band gap such that the third subcell is lattice mismatched with respect to the second subcell; and forming a contact composed of a sequence of layers over the first subcell at a temperature of 280 C. or less and having a contact resistance of less than 510^(4 )ohms-cm^(2).


Patent
Emcore Co. | Date: 2014-01-02

A semiconductor device or an integrated circuit formed on a substrate with shunt disposed on the substrate in parallel with the device or circuit and designed to form a closed circuit or discharge path when the device is subjected to an electrostatic discharge pulse.


A method of forming a multijunction solar cell including an upper subcell, a middle subcell, and a lower subcell by providing a substrate for the epitaxial growth of semiconductor material; forming a first solar subcell on the substrate having a first band gap; forming a second solar subcell over the first solar subcell having a second band gap smaller than the first band gap; forming a graded interlayer over the second subcell, the graded interlayer having a third band gap greater than the second band gap; forming a third solar subcell over the graded interlayer having a fourth band gap smaller than the second band gap such that the third subcell is lattice mismatched with respect to the second subcell; and forming a contact composed of a sequence of layers over the first subcell at a temperature of 280 C. or less and having a contact resistance of less than 510^(4 )ohms-cm^(2).


Patent
Emcore Co. | Date: 2015-06-15

An optical modulator including an information-containing radio frequency signal input; a semiconductor device having an optical input optically for receiving the coherent light beam, and a electrode connected to said radio frequency signal input and having a modulated bias potential so that current is generated in the second semiconductor device and extracted therefrom, while the coherent light beam is optically modulated by the signal changing the carrier density in the semiconductor device.


A system for generating electrical power from solar radiation utilizing a thin film III-V compound multijunction semiconductor solar cell mounted on a support in a non-planar configuration is disclosed herein.


Patent
Emcore Co. | Date: 2016-04-04

A semiconductor device comprising a substrate; a monolithic gain region disposed on the substrate and operable to produce optical gain in response to current injection, including a first electrode over a first portion of the gain region having a first length L_(1), with a first current I_(1 )being applied; and a second electrode over a second portion of the gain region having a second length L_(2), with a second current I_(2 )being applied; wherein I_(1)/L_(1 )is greater than I_(2)/L_(2).


Patent
Emcore Co. | Date: 2016-03-25

A method of making an optical modulator by determining the material composition of the quantum well region in the waveguide portion of the modulator so that the modulator is transparent at a gain peak wavelength that is greater than the predetermined wavelength by a predetermined amount, and fabricating the modulator with the determined material composition.


Inverted metamorphic multijunction solar cells having a heterojunction middle subcell and a graded interlayer, and methods of making same, are disclosed herein. The present disclosure provides a method of manufacturing a solar cell using an MOCVD process, wherein the graded interlayer is composed of (In_(x)Ga_(1-x))_(y )Al_(1-y)As, and is formed in the MOCVD reactor so that it is compositionally graded to lattice match the middle second subcell on one side and the lower third subcell on the other side, with the values for x and y computed and the composition of the graded interlayer determined so that as the layer is grown in the MOCVD reactor, the band gap of the graded interlayer remains constant at 1.5 eV throughout the thickness of the graded interlayer.

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