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Hybrid InGaN/CdZnO quantum well structures for optoelectronic applications in the short wavelength spectral region
Author(s) -
Park SeoungHwan,
Ahn Doyeol
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248469
Subject(s) - quantum well , wavelength , optoelectronics , materials science , intensity (physics) , optics , physics , laser
Spontaneous emission characteristics of hybrid In x Ga 1 − x N/Cd 0.05 Zn 0.95 O quantum well (QW) structures were theoretically investigated by using multi‐band effective mass theory. The transition wavelength of the InGaN/CdZnO QW structure is shown to be changed from 415 to 580 nm when the In content x is varied from 0.1 to 0.3. The conventional InGaN/GaN QW structure shows that its peak intensity linearly decreases with increasing peak wavelength. On the other hand, the InGaN/CdZnO QW structure shows that the spontaneous emission coefficient reaches a maximum at around the peak wavelength of 0.484 µm, which corresponds to x = 0.2. This can be explained by the fact that, in a range of the short peak wavelengths, the InGaN/CdZnO QW structure has a very shallow potential well. In a range of the longer peak wavelengths above 0.47 µm, the InGaN/CdZnO QW structure is expected to have a larger spontaneous emission peak than the InGaN/GaN QW structure. This can be explained by the fact that the former has a reduced internal field compared to the latter.