Source: http://aoot.osa.org/ome/abstract.cfm?uri=ome-9-3-1488
Timestamp: 2019-04-21 08:45:52+00:00

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We fabricate and study direct InP/Si heterojunction by corrugated epitaxial lateral overgrowth (CELOG). The crystalline quality and depth-dependent charge carrier dynamics of InP/Si heterojunction are assessed by characterizing the cross-section of grown layer by low-temperature cathodoluminescence, time-resolved photoluminescence and transmission electron microscopy. Compared to the defective seed InP layer on Si, higher intensity band edge emission in cathodoluminescence spectra and enhanced carrier lifetime of InP are observed above the CELOG InP/Si interface despite large lattice mismatch, which are attributed to the reduced threading dislocation density realized by the CELOG method.
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Fig. 1 (a)-(d) Process flow of InP-seed mesa fabrication for CELOG. (e) Schematic of the InP-seed mesa pattern on Si before CELOG. The thickness of InP-seed layer is 2 μm and the distance between the two adjacent circular rings, of diameter 30 μm, is 5µm. (f) Schematic of the CELOG InP/Si cross-section.
Fig. 2 SEM images (a, c) and the corresponding panchromatic CL images (b, d) of CELOG InP /Si cross section. Voids can be seen next to the seed in SEM images (a & c). The PanCL images were taken at 80 K.
Fig. 3 (a) CL spectra measured at different sites (S1-S4) in the CELOG InP/Si cross section indicated in the panCL image in the inset. (b) Monochromatic CL images at wavelengths 892 nm, 967 nm and 1120 nm extracted from the spectral image. The yellow line markings in the CL image are the approximate position of InP/Si interface.
Fig. 4 Room temperature time resolved PL decay curves measured on the (110) plane of CELOG cross section vertically along (a) CELOG region (CELOG-scan) and (c) seed region (seed-scan). The measured points from where the TRPL were acquired are shown in the inset SEM image of CELOG InP/Si cross-section. The numbers in decay curves denote the distances of the measured points from the CELOG surface. Carrier life times extracted from the line scannings are shown in (b) and (d), respectively. The scanning lines are marked in the inset SEM image. The highest intensity and PL lifetimes are observed near the InP/Si interface of the CELOG region.
Fig. 5 Time resolved PL decay curves of CELOG InP/Si and InP-seed/Si. CELOG top refers to the measurement on top (001) surface of 20 µm thick CELOG surface; CELOG CS-19µm and CELOG CS-2µm refer to the measurements on the (110) cross sectional surface at 19 µm and 2 µm from the top surface, respectively.
Fig. 6 (a) Bright field TEM image showing the smooth interface between InP and Si in the CELOG region. No threading dislocations contrast is observed in the InP film. (b) Selected area electron diffraction pattern acquired at the film-substrate interfacial region. (c) HRTEM cross section of CELOG InP/Si interface. The yellow lines marked in the HRTEM are parallel to (110) atomic planes. By counting the number of (110) planes between the lines in both layers, one missing plane in the InP layer can be inferred.

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