title: Near-infrared photoluminescence in germanium oxide enclosed germanium nano- and micro-crystals.
abstract: We have studied the near-infrared photoluminescence properties of free-standing germanium nano-crystals (20 nm on average) and micro-crystals (60 µm on average) at 80-300 K. Two peaks were observed at ∼1.0 and ∼1.4 eV from both the nano- and micro-crystals. The integrated PL (I(PL)) intensity of the nano-crystals is about an order of magnitude stronger than that of the micro-crystals and the I(PL) is also enhanced by ageing in air for both crystals. The ∼1.0 eV peak position does not change with either the crystal size or temperature. We suggest that the deep traps located at the interfacial region between the surface GeO(2) layer and the bulk crystal Ge is responsible for the near-infrared PL.
authors: Wenzhong
authors: W
authors: Wang
authors: Keda
authors: K
authors: Wang
authors: Daxing
authors: D
authors: Han
authors: Bed
authors: B
authors: Poudel
authors: Xiaowei
authors: X
authors: Wang
authors: D Z
authors: DZ
authors: Wang
authors: Baoqing
authors: B
authors: Zeng
authors: Z F
authors: ZF
authors: Ren