Patent ID: 8877592
Filing Date: 2014-11-04
Classification: H01L

Abstract:
1. A method of growing a doped epitaxial material, comprising: providing a semiconductor substrate, wherein the semiconductor substrate has a crystalline surface and an amorphous surface; and performing a cyclic deposition-deposition-etch (CDDE) process to grow the doped epitaxial material over the crystalline surface and not on the amorphous surface, wherein each cycle of the CDDE process forms a first doped epitaxial material during a first deposition process and a second doped epitaxial material during a second deposition process, a first dopant concentration of the first doped epitaxial material formed during the first deposition process of the CDDE process being different from a second dopant concentration of the second doped epitaxial material formed during the second deposition process of the CDDE process, wherein a portion of the second doped epitaxial material is removed using an etch process in each cycle of the CDDE process.