Deterministic self‐organization: Ordered positioning of InAs quantum dots by self‐organized anisotropic strain engineering on patterned GaAs (311)B

Abstract

AbstractLaterally ordered InGaAs quantum dot (QD) arrays, InAs QD molecules, and single InAs QDs in a spot‐like periodic arrangement are created by self‐organized anisotropic strain engineering of InGaAs/GaAs superlattice (SL) templates on planar GaAs (311)B substrates in molecular beam epitaxy. On shallow‐ and deep‐patterned substrates the respectively generated steps and facets guide the self‐organization process during SL template formation to create more complex ordering such as periodic stripes, depending on pattern design. Here we demonstrate for patterns such as shallow‐ and deepetched round holes and deep‐etched zigzag mesas that the self‐organized periodic arrangement of QD molecules and single QDs is spatially locked to the pattern sidewalls and corners. This extends the concept of guided self‐organization to deterministic self‐organization. Absolute position control of the QDs is achieved without one‐to‐one pattern definition. This guarantees the excellent arrangement control of the ordered QD molecules and single QDs with strong photoluminescence emission up to room temperature, which is required for future quantum functional devices. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)