[en] We report high quality InP layers selectively grown in shallow trench isolation structures on 6 degree offcut Si (001) substrates capped with a thin Ge buffer layer. The Ge layer was used to reduce the thermal budget for surface clean and double step formation. The atomic steps on the Ge surface were recovered after a bake at 680°C. Smooth nucleation layer was obtained at 420°C on the Ge surface. Baking the Ge surface in As ambient facilitates the InP nulceation and improves the InP crystalline quality. This improvement is attributed to the effective As adsorption on the Ge surface and the polar Ge:As surface prevents the islanding of InP seed layer. Stacking faults were found in the InP layers as a result of threading dislocation dissociation and high quality InP layers were obtained in trenches with aspect ratio greater than 2.
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