Hydrogen-induced improvements in optical quality of GaNAs alloys

Buyanova, I. A.; Izadifard, M.; Chen, W. M.; Polimeni, A.; Capizzi, M.; Xin, H. P.; Tu, C. W.
May 2003
Applied Physics Letters;5/26/2003, Vol. 82 Issue 21, p3662
Academic Journal
Strong suppression of potential fluctuations in the band edges of GaNAs alloys due to postgrowth hydrogen treatment, which is accompanied by a reopening of the alloy band gap, is revealed from temperature-dependent photoluminescence (PL) and PL excitation measurements. The effect likely indicates preferential trapping of hydrogen near the lattice sites with the highest nitrogen content. A remarkable improvement in the radiative efficiency of the alloys at room temperature is also demonstrated and is ascribed to efficient hydrogen passivation of competing nonradiative centers.


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