Titanium Dioxide (TiO2) has been used as a working electrode of Dye sensitized solar cells (DSSC) for a long time. Their porous nature results in high surface area that ensures efficient light absorption. Apart from other advantages the porous nature of TiO2 results in a large number of surface states that trap carriers and promote recombination because of which efficiency goes down. In the present work, we have synthesized nanoparticles of PbS and develop a nanocomposite paste of TiO2–PbS. We have tested our nanocomposite paste for working electrode in DSSC. The samples were characterized using XRD, UV-VIS absorbance spectroscopy, FT-IR and SEM. PbS nanoparticles serve as surface state depressors, which reduces the surface states of TiO2 films. This further reduces recombination rate and increases the conversion efficiency of DSSC. The mechanism of charge transport on photovoltaic response and other parameters of the DSSC using PbS–TiO2 nanocomposite are also presented in detail.