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Direct bandgap type-I Ge quantum dots/GeSnSi for SWIR and MWIR lasers
Liyao Zhang,Peng Yu,Shuang Yao,Duo Feng,Jinmeng Dai 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.1
A direct bandgap type-I Ge QDs/Ge1−y−zSnySiz double-heterostructure on Ge1−xSnx virtual substrates is proposed for SWIRand MWIR lasers. The Ge1−y−zSnySiz barrier is lattice-matched to Ge1−xSnx. The band structures are calculated with differentto Sn contents in Ge1−y−zSnySiz and Ge1−xSnx. The band edge energies of Ge QDs vary linearly with x, and independent withy. The Γ-valley is below L-valley when x exceeds 7.5%. The ground states of electrons of Γ- and L-conduction band varieswith both x and y. High x and y can increase the conduction band offsets and decrease the valence band offsets. Emissionwavelengths range from 1.91 to 4.6 μm are achieved from the proposed structure with proper Sn contents.