Configuration of Si-Si covalent bonds on different planes of monocrystalline silicon. (a) Si(100); (b) Si(110) and (c) Si(111). The dangling bonds were indicated by dotted lines. Some covalent bonds that inhibit on one atom are partly showed.
Yu and Qian Nanoscale Research Letters 2013 8:137 doi:10.1186/1556-276X-8-137