Improving carrier transport in strontium-doped cuprous oxide thin films prepared by Nebulizer spray pyrolysis for solar cell applications

摘要： Strontium-doped Cu2O thin ?lms of different doping concentrations (0, 3, 5 and 7%) are deposited successfully with the help of Nebulizer spray technique. All the samples were characterized by XRD, AFM, Raman, UV–Vis, photoluminescence and Hall effect, and solar cell ef?ciency is calculated. From the XRD studies, the cubic structural phase of Cu2O is con?rmed. The micrographs of AFM explain that the particles were uniformly distributed on the surface with homogeneous grains. The band gap value ranges from 2.17 to 1.95 eV as the doping concentration increases from 0 to 7%. The PL emission at * 630 nm also con?rms the cuprous oxide phase. The deposited ?lm exhibits p-type conductivity with low resistivity of 0.90 9 102 X cm and high carrier concentration of 22.7 9 1015 cm-3. A heterojunction solar cell of FTO/n-ZnO/p-Sr-doped Cu2O is fabricated, and the power conversion ef?ciency (g) is 0.75% for 7% Sr-doped ?lm.