Multiple quantum well structure

摘要

A multiple quantum well structure (1) comprises a multiple layer structure comprising alternating well and barrier layers (3, 4) comprising first and second materials respectively stacked in a first direction (z). Each barrier layer has a plurality of holes (6) filled with a third material so to form a plurality of respective bridge regions (9) which connect adjacent well layers. The bridge regions have dimensions of no more than 50 nm in directions (x, y) perpendicular to the first direction.