HYDROGEN EFFECT ON 670-NM ALGAINP VISIBLE LASER DURING HIGH-TEMPERATURE OPERATION

Characteristic changes of single-mode 670-mn strained multiquantum-wel l (S-MQW) AlGaInP visible lasers during accelerated aging test are inv estigated, After a short-term continuous operation of 3m W at 50 degre es C, the threshold current and slope efficiency are improved by 8.5% and 24%, respectively, In order to find out the origin of characterist ic changes, photoluminescence and secondary ion mass spectrometry (SIM S) measurement were carried out, SIMS measurement revealed that atomic hydrogen, which had been formed as a zinc-hydrogen complex in the p-t ype InGaInP cladding layer, were dissociated and drifted into the acti ve region of the laser structure during high temperature operation. Th ese result in increase of the hole concentration of the p-AlGaInP laye r, which enhances the heterobarrier height between the p-cladding laye r and the active region, In addition, the dissociated atomic hydrogen drifted into the active region by bias voltage passivates the defects in that region, which is proved by low temperature photoluminescence m easurement showing that the defect-related peaks are disappeared.