Dynamic properties of excitons in ZnO/AlGaN/GaN hybrid nanostructures

Mathias Forsberg; Carl Hemmingsson; Hiroshi Amano; Galia Pozina

doi:10.1038/srep07889

Dynamic properties of excitons in ZnO/AlGaN/GaN hybrid nanostructures

Sci Rep. 2015 Jan 20:5:7889. doi: 10.1038/srep07889.

Authors

Mathias Forsberg¹, Carl Hemmingsson¹, Hiroshi Amano², Galia Pozina¹

Affiliations

¹ Department of Physics, Chemistry and Biology (IFM), Linköping University, S-581 83 Linköping, Sweden.
² Department of Electrical Engineering and Computer Science, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan.

Abstract

Hybrid samples based on ZnO colloidal nanocrystals (NCs) deposited on AlGaN/GaN quantum well (QW) structures with different top barrier thickness d = 3, 6 and 9 nm are studied by time-resolved photoluminescence. Thermal behavior of the QW exciton lifetime in the hybrids and in the bare QW structures has been compared and it has been found that the QW exciton recombination rate increases in the hybrid having d = 3 nm and decreases in the hybrid with d = 6 nm, while no change has been observed for the structure with d = 9 nm. It is suggested that non-radiative resonance energy transfer from the QW excitons to the ZnO NCs and a variation of the surface potential can both influence the QW exciton lifetime in the hybrids.

Publication types

Research Support, Non-U.S. Gov't