Buffolo, Matteo Samparisi, Fabio De Santi, Carlo Jung, Daehwan Norman, Justin Bowers, John E. Herrick, Robert W. Meneghesso, Gaudenzio Zanoni, Enrico Meneghini, Matteo 2024-01-19T20:01:11Z 2024-01-19T20:01:11Z 2021-09-02 2019-06 0018-9197 https://pubs.kist.re.kr/handle/201004/119914 We present an extensive analysis of the physical mechanisms responsible for the degradation of 1.3-mu m InAs quantum dot lasers epitaxially grown on Si, for application in silicon photonics. For the first time, we characterize the degradation of the devices by combined electro-optical measurements, electroluminescence spectra, and current-voltage analysis. We demonstrate the following original results: when submitted to a current step-stress experiment: 1) QD lasers show a measurable increase in threshold current, which is correlated to a decrease in slope efficiency; 2) the degradation process is stronger, when devices are stressed at current higher than 200 mA, i.e., in the stress regime, where both ground-state and excited-state emission are present; and 3) in the same range of stress currents, an increase in the defect-related current components is also detected, along with a slight decrease in the series resistance. Based on the experimental evidence collected within this paper, the degradation of QD lasers is ascribed to a recombination-enhanced defect reaction (REDR) process, activated by the escape of electrons out of the quantum dots. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC TEMPERATURE-DEPENDENCE THRESHOLD CURRENT SI INJECTION Physical Origin of the Optical Degradation of InAs Quantum Dot Lasers Article 10.1109/JQE.2019.2909963 1 IEEE JOURNAL OF QUANTUM ELECTRONICS, v.55, no.3 IEEE JOURNAL OF QUANTUM ELECTRONICS 55 3 scie scopus 000466036300001 2-s2.0-85064930611 Engineering, Electrical & Electronic Quantum Science & Technology Optics Physics, Applied Engineering Physics Optics Article TEMPERATURE-DEPENDENCE THRESHOLD CURRENT SI INJECTION Quantum dots lasers degradation semiconductor defects carrier escape reliability