Optical properties of InGaN/GaN and AlGaN/GaN multiple quantum well structures
2003 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, Vol. 5023, 63-67 p.Conference paper (Other academic)
We report on low temperature photoluminescence (PL) in In xGa1-xN multiple quantum wells (MQWs) with x in the range 0.1 and highly Si doped barriers of In0.01Ga0.99N. One sample with 3 QWs of width 3.5 nm and barriers of width 10.5 nm had the MQW in the depletion region of the outer surface. Two PL peaks were observed, one QW exciton from the QW closest to the GaN buffer, one lower energy peak related to a 2DEG at the interface to the GaN buffer layer. In a second similar sample 5 QWs of width 3 nm and with 6 nm highly Si doped In0.01Ga 0.99N barriers the MQW was placed in the n-side depletion region of a pn-junction. At low temperatures the PL and electroluminescence (EL) spectra are quite different at no, low, or reverse bias, the PL appearing at higher energy. At high forward bias a spectral component at the EL position appears. This proves a strong influence of the depletion field on the optical spectra. Preliminary results are also reported for n-doped Al0.07Ga 0.93N/GaN structures, with near surface MQWs.
Place, publisher, year, edition, pages
2003. Vol. 5023, 63-67 p.
Depletion fields, III-nitrides, Luminescence, Polarisation fields, Quantum wells
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-46485DOI: 10.1117/12.511285OAI: oai:DiVA.org:liu-46485DiVA: diva2:267381