Semiconductors with dimensions in the nanometer realm are important because their electrical, optical and chemical properties can be tuned by changing the size of particles. Optical properties are of great interest for application in optoelectronics, photovoltaic and biological sensing. Various chemical synthetic methods have been developed to prepare such nanoparticles [1]. Zinc Oxide (ZnO) is a unique material with a direct band gap (3.37 eV) and large exciton binding energy of 60 meV. Because of its exceptional optical and electrical properties, zinc oxide has been extensively used in many technological applications such as near-UV emission, thin film transistors, gas sensors, transparent conductor, Biomedical and piezoelectric application [2-6]. In addition to these applications ZnO also shows its potential in Dye Sensitized solar cells. Dye sensitized solar cells (DSSCs) are a new type of metal oxide wide-band-gap solar cells composed of a semiconductor photoanode absorbed dye molecules, and a counter electrode, and an electrolyte between photoanode and counter electrode. In recent years, a dye sensitized titanium dioxide (TiO2) solar cell made by Grätzel et al. has been considered as a cost-effective alternative to traditional solar cells. Nowadays, the TiO2 DSSC modified with other semiconductor materials, such as zinc oxide, is widely investigated to improve the cell performance. ZnO posses a wide band gap, low resistance and high light trapping characteristics that make them useful in solar cells applications. Most of the ZnO crystals have been synthesized by traditional high temperature solid state method which is energy consuming and difficult to control the particle properties [7]. ZnO nanoparticles can be prepared on a large scale at low cost by simple solution based methods, such as chemical precipitation, sol-gel synthesis, and solvothermal/hydrothermal reaction [8]. Hydrothermal technique is a promising alternative synthetic method because of the low temperature process and very easy to control the particle size [9]. The hydrothermal process have several advantage over other growth processes such as use of simple equipment, catalyst-free growth, low cost, large area uniform production, environmental friendliness and less hazardous [10]. The low reaction temperatures make this method an attractive one for microelectronics and plastic electronics. This method has also been successfully employed to prepare nanoscale ZnO and other luminescent materials [11]. The particle properties such as morphology and size can be controlled via the hydrothermal process by adjusting the reaction temperature, time and concentration of precursors [12]. The present study focuses on the hydrothermal synthesis of ZnO nanopowders/thin films concentration of the precursors and time of growth on its properties.