Abstract
We study the temperature dependence of the photoluminescence (PL) from InAs quantum dot chains (QDC) grown by MBE on [011]- and [011¯]-oriented UV nanoimprint lithography processed groove patterns. We observe an increase of PL intensity from the [011¯]-oriented QDCs within the temperature range from 20–70K, which is attributed to thermally activated carrier transport from small quantum dots accumulated on the sidewalls of the [011¯]-oriented grooves to the quantum dots at the bottom of the groove. We utilize a rate equation model to quantitatively analyze the carrier transfer mechanism. Furthermore, we show that the defect related carrier loss mechanism, which accounts for weak PL quenching at low temperatures, is similar for QDCs and self-assembled quantum dots (SAQD) that were used as a reference. The carrier loss mechanism that causes the rapid quenching of SAQD PL at high temperatures is identified as exciton escape, while for the QDCs it is either single carrier escape or escape of uncorrelated electron–hole pairs. This result reveals a significant difference in the carrier dynamics of site-controlled QDCs and SAQDs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
