 
<p style=\"margin: 0in 0in 0pt; text-align: justify; line-height: 150%; ; mso-layout-grid-align: none;\"><span style=\"line-height: 150%; font-family: \'Times New Roman\',\'serif\'; font-size: 10pt;\">Investigations of the development of environmentally friendly low cost solar cells with inexpensive semiconductor materials are extremely important for development of solar energy technology. Among these Cuprous Oxide is non toxic and its component elements are readily available and it has 2 eV band gap energy. Therefore <span style=\"color: black;\">cuprous oxide is considered to be a material with a large potential from the viewpoint of its applications in photovoltaics and sensors.</span> Grain size of polycrystalline semiconductor thin films in solar cells can be optimized to enhance the efficiency of solar cells. <span style=\"color: black;\">In the present study we have demonstrated the possibility to form photosensitive nanostructured copper oxide thin films on Ti substrates with large surface area by means of electrodeposition in copper acetate bath. </span>Linear-sweep<span style=\"color: #141314;\"> voltammetry was used to determine the optimal deposition potential. </span><span style=\"color: black;\">These nanostructures were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and photoelectrochemical techniques. </span>In this investigation we have demonstrated that polycrystalline n-type and p-type cuprous oxide thin films having small crystals of the size of 100 nm could be electrodeposited. It can be seen on the SEM micrographs that grains evolve from irregular shape with average size of </span><span style=\"line-height: 150%; font-family: Symbol; font-size: 10pt; mso-ascii-font-family: \'Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'; mso-bidi-font-family: \'Times New Roman\'; mso-char-type: symbol; mso-symbol-font-family: Symbol;\"><span style=\"mso-char-type: symbol; mso-symbol-font-family: Symbol;\">~</span></span><span style=\"line-height: 150%; font-family: \'Times New Roman\',\'serif\'; font-size: 10pt;\">1 </span><span style=\"line-height: 150%; font-family: Symbol; font-size: 10pt; mso-ascii-font-family: \'Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'; mso-bidi-font-family: \'Times New Roman\'; mso-char-type: symbol; mso-symbol-font-family: Symbol;\"><span style=\"mso-char-type: symbol; mso-symbol-font-family: Symbol;\">m</span></span><span style=\"line-height: 150%; font-family: \'Times New Roman\',\'serif\'; font-size: 10pt;\">m at pH 5.8 into a rectangular shape with average size of </span><span style=\"line-height: 150%; font-family: Symbol; font-size: 10pt; mso-ascii-font-family: \'Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'; mso-bidi-font-family: \'Times New Roman\'; mso-char-type: symbol; mso-symbol-font-family: Symbol;\"><span style=\"mso-char-type: symbol; mso-symbol-font-family: Symbol;\">~</span></span><span style=\"line-height: 150%; font-family: \'Times New Roman\',\'serif\'; font-size: 10pt;\">100 nm at pH 7.9. This SEM and XRD data clearly indicate that the grain size gradually decrease as the pH value of the solution increases from pH 5.8-7.9. </span></p>
 