Sign of the piezoelectric field in asymmetric GaInN/AlGaN/GaN single and double quantum wells on SiC

Conference · Sat Jul 01 04:00:00 EDT 2000

OSTI ID:20104602

Im, J S; Hangleiter, A; Off, J; Scholz, F

The authors study both GaInN/GaN/AlGaN quantum wells with an asymmetric barrier structure grown on SiC substrate and GaN/AlGaN asymmetric double quantum well (ADQW) structures. In the first case, a time-resolved study reveals an enhanced oscillator strength when the AlGaN barrier is on top of the GaInN quantum well. In comparison to their previous study of the same structure grown on sapphire, the authors find that the sign of the field is the same in both cases: the field points towards the substrate. In the case of ADQW, they observed not only intrawell transitions of both a 4 nm and a 2 nm QW separated by a 2.5 nm AlGaN barrier but also an interwell transition between the two QWs in the photoluminescence. The lifetimes and emission energies of the transitions can be well explained by the existence of the piezoelectric field built in the QWs.

• Research Organization: Technische Univ. Braunschweig (DE)
• OSTI ID: 20104602
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
ALUMINIUM NITRIDES
ELECTRIC FIELDS
EXPERIMENTAL DATA
GALLIUM NITRIDES
INDIUM NITRIDES
OPTICAL PROPERTIES
PHOTOLUMINESCENCE
SEMICONDUCTOR DEVICES
THIN FILMS