  Successful isolation of graphene from graphite opened a new era for material
science and con- densed matter physics. Due to this remarkable achievement,
there has been an immense interest to synthesize new two dimensional materials
and to investigate their novel physical properties. Silicene, form of Si atoms
arranged in a buckled honeycomb geometry, has been successfully synthesized and
emerged as a promising material for nanoscale device applications. However, the
major obstacle for using silicene in electronic applications is the lack of a
band gap similar to the case of graphene. Therefore, tuning the electronic
properties of silicene by using chemical functionalization methods such as
hydrogenation, halogenation or oxidation has been a focus of interest in
silicene research. In this paper, we review the recent studies on the
structural, electronic, optical and mechanical proper- ties of
silicene-derivative structures. Since these derivatives have various band gap
energies, they are promising candidates for the next generation of electronic
and optoelectronic device applications.
