Patent ID: 7045812

Claim:
A method for producing an opto-electrical device having a spectral bandwidth, the method comprising: stacking a plurality of quantum wells, each having a two-dimensional density of states, on an epitaxial layer, forming at least two of the quantum wells with different widths and barrier heights; arranging a plurality of separate confinement heterostructures amongst the quantum wells, each of the separate confinement heterostructures having a thickness of at least 120 nm; injecting electrons into a first end of a region containing the quantum wells and separate confinement heterostructures; injecting holes into a second, opposite end of the region; and distributing the electrons and holes uniformly within the quantum wells by enabling the electrons to enter the quantum wells before the holes, including selecting the composition of the quantum wells and the separate confinement heterostructures based on capture time of the electrons and the holes in the quantum wells; selecting the thickness of the separate confinement heterostructures based on the two-dimensional density of states within the quantum wells, comprising selecting a greater thickness to obtain greater uniformity in the electron and hole distribution; and selecting a barrier height of the separate confinement heterostructures based on the two-dimensional density of states within the quantum wells, comprising selecting a lesser height to obtain greater uniformity in the electron and hole distribution.