Using wet chemical reaction between N-vinylcarbazole and hydrogen-terminated silicon surface, we present a new and simple route to directly bond,pi-conjugated organic molecule on silicon surface. The Si can be in the form of single crystal Si including heavily doped p-type Si, intrinsic Si, heavily doped n-type Si, on Si(1 1 1) and Si(1 0 0), and on n-type polycrystalline Si. The covalent bond between 9-vinylcarbazole and silicon surface was confirmed by reflectance F-FIR, XPS and contact angle measurement, respectively. A data-encompas sing explanation for the mechanism discusses the possible route of the reaction. This simple and low-costly reaction offers an attractive route to attach functional conjugated molecules onto the semiconductor surface which aims to create some unique molecular device in the future. (c) 2006 Published by Elsevier B.V.