研究目的
To examine structural and optical properties of the active region of quantum cascade lasers grown fully by MOCVD technique and study the influence of different growth temperatures of the cladding layers on the properties of the active core.
研究成果
The study concludes that the growth temperature of the cladding layers influences the structural and optical properties of the active core of quantum cascade lasers. A model of atoms interdiffusion processes was presented to explain observed energy shifts. It is recommended to grow the core part and cladding at the same temperature to avoid post-growth annealing effects.
研究不足
The study is limited to the analysis of structural and optical properties of MOCVD-grown quantum cascade lasers with specific growth temperatures. The model of atoms interdiffusion processes is simplified and may not account for all possible effects.
1：Experimental Design and Method Selection:
The study involved growing a set of InGaAs/AlInAs based multilayer structures with different growth temperatures of the cladding layers using MOCVD technique. Structural and optical properties were examined using HRXRD, FTPL, and PR measurements.
2：Sample Selection and Data Sources:
Samples were grown with active core at 645°C and claddings at 600°C, 645°C, and 680°C.
3：List of Experimental Equipment and Materials:
AIXTRON 3×2 CCS system for growth, TMIn, TMGa, TMAl, PH3, and AsH3 as sources, LayTec EpiTT for in-situ control, Bruker Vertex 80 v spectrometer for FTPL, and a photoreflectance setup for PR measurements.
4：Experimental Procedures and Operational Workflow:
Growth of samples, HRXRD measurements to determine layer widths, FTPL and PR measurements to assess optical properties.
5：Data Analysis Methods:
Comparison of measured transition energies with calculated values, analysis of atoms interdiffusion processes.
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