Dye-sensitized solar cells have attracted renewed interests due to the low fabrication cost and ever-growing power conversion efficiency.In this talk,I will focus on the following three topics of our research.(1) Plasmon-enhanced light harvesting,in which the rod-like gold nanostructures demonstrate the ability to improve the longerwavelength light harnessing.[1] (2) Cosensitization to expand the spectral response.In this section,I will introduce the insertion of small molecule (a phenothiazine-based dye) into the interstitial site of porphyrin molecules on TiO2 surface being able to suppress the back electron transfer and improve the light harvesting.[2,3] (3)Improvement of pore filling of gel electrolyte in the devices for high-efficiency solar-to-electrical energy conversion.[4]