Open structure ZnO/CdSe core/shell nanoneedle arrays for solar cells
1 School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, People's Republic of China
2 School of Information Science and Engineering, Shandong University, Jinan, 250100, People's Republic of China
3 Physics Department, Portland State University, PO Box 751, Portland, OR 97207, USA
Nanoscale Research Letters 2012, 7:516 doi:10.1186/1556-276X-7-516Published: 20 September 2012
Open structure ZnO/CdSe core/shell nanoneedle arrays were prepared on a conducting glass (SnO2:F) substrate by solution deposition and electrochemical techniques. A uniform CdSe shell layer with a grain size of approximately several tens of nanometers was formed on the surface of ZnO nanoneedle cores after annealing at 400°C for 1.5 h. Fabricated solar cells based on these nanostructures exhibited a high short-circuit current density of about 10.5 mA/cm2 and an overall power conversion efficiency of 1.07% with solar illumination of 100 mW/cm2. Incident photo-to-current conversion efficiencies higher than 75% were also obtained.