High temperature stability in non-polar (11-20) InGaN quantum dots: Exciton and biexciton dynamics

被引：17

作者：

Reid, B. P. L. ^{[1
]}

Zhu, T. ^{[2
]}

Chan, C. C. S. ^{[1
]}

Kocher, C. ^{[1
]}

Oehler, F. ^{[2
]}

Emery, R. ^{[2
]}

Kappers, M. J. ^{[2
]}

Oliver, R. A. ^{[2
]}

Taylor, R. A. ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Parks Rd, Oxford OX1 3PU, England

[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

来源：

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 11, NO 3-4 | 2014年 / 11卷 / 3-4期

基金：

英国工程与自然科学研究理事会;

关键词：

quantum dots; non-polar; InGaN; biexciton; LIFETIME;

D O I：

10.1002/pssc.201300666

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report on optical studies of non-polar InGaN quantum dots grown on the (1120) plane. Excitonic and biexcitonic complexes are identified by their power dependence and show similar binding energies (similar to 36 meV) and recombination dynamics to conventional polar (0001) InGaN quantum dots. Measured lifetimes as low as 300 ps suggest a reduced internal electric field when compared with polar InGaN quantum dots. Temperature dependent micro-photoluminescence measurements on a single exciton with a lifetime of 327 ps reveal no significant exciton linewidth broadening up to 120 K, suggesting a reduction in phonon coupling strength when compared to polar quantum dots. This is supported by a measured lifetime of 313 ps for this exciton at 77 K, suggesting the measured exciton decay is almost purely radiative. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：702 / 705

页数：4

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