In this work we study Ge structures grown on silicon substrates. We use photoluminescence and photoreflectance to determine both direct and indirect gap of Ge under tensile strain. The strain is induced by growing the Ge on an InGaAs buffer layer with variable In content. The band energy levels are modeled by a 30 band k·p model based on first principles calculations. Characterization techniques show very good agreement with the calculated energy values.
Dzianis Saladukha, Tomasz J. Ochalski, Felipe Murphy Armando, Michael B. Clavel, and Mantu K. Hudait, "Laser and transistor material on Si substrate," Proc. SPIE 10108, Silicon Photonics XII, 101080E (Presented at SPIE OPTO: January 31, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2252383.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon