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Ge nano-belts with large tensile strain are considered as one of the promising materials for high carrier mobility metal–oxide–semiconductor transistors and efficient photonic devices.In this paper,we design the Ge nano-belts on an insulator surrounded by Si3N4or SiO2for improving their tensile strain and simulate the strain profiles by using the finite difference time domain(FDTD) method.The width and thickness parameters of Ge nano-belts on an insulator,which have great effects on the strain profile,are optimized.A large uniaxial tensile strain of 1.16% in 50-nm width and 12-nm thickness Ge nano-belts with the sidewalls protected by Si3N4is achieved after thermal treatments,which would significantly tailor the band gap structures of Ge-nanobelts to realize the high performance devices.
Ge nano-belts with large tensile strain are considered as one of the promising materials for high carrier mobility metal-oxide-semiconductor transistors and efficient photonic devices. This paper, we design the Ge nano-belts on an insulator surrounded by Si3N4or SiO2 for Improving their tensile strain and simulate the strain profiles by using the finite difference time domain (FDTD) method. width and thickness parameters of Ge nano-belts on an insulator, which have great effects on the strain profile, are optimized. A large uniaxial tensile strain of 1.16% in 50-nm width and 12-nm thickness Ge nano-belts with the sidewalls protected by Si3N4is achieved after thermal treatments, which would not tailor the band gap structures of Ge-nanobelts to realize the high performance devices.