The effects of fabrication temperature on current-voltage characteristics and energy efficiencies of quantum dot sensitized ZnOH-GO hybrid solar cells

Abstract

Articles you may be interested inGreen synthesis of highly efficient CdSe quantum dots for quantum-dots-sensitized solar cells Employing green synthesized silver nanoparticles as light harvesters in nanostructured solar cells J. Renewable Sustainable Energy 5, 031615 (2013); 10.1063/1.4807616 Energy transfer versus charge separation in hybrid systems of semiconductor quantum dots and Ru-dyes as potential co-sensitizers of TiO2-based solar cells Assembly of CdSe nanoparticles on graphene for low-temperature fabrication of quantum dot sensitized solar cell Appl. Phys. Lett. 98, 093112 (2011);The effects of fabrication temperature are investigated on the performance of CdSe quantum dot (QD)-sensitized hybrid solar cells of the composite material of zinc (hydr)oxide (ZnOH-GO)with 2 wt. % graphite oxide. The current-voltage (I-V) and photo-current measurements show that higher fabrication temperatures yield greater photovoltaic power conversion efficiencies that essentially indicate more efficient solar cells. Two Photon Fluorescence images show the effects of temperature on the internal morphologies of the solar devices based on such materials. The CdSe-QD sensitized ZnOH-GO hybrid solar cells fabricated at 450 C showing conversion of $10.60% under a tungsten lamp (12.1 mW/cm 2 ) are reported here, while using potassium iodide as an electrolyte. The output photocurrent, I (lA) with input power, P (mW/cm 2 ) is found to be superlinear, showing a relation of I ¼ P n , where n ¼ 1.4. V C 2014 AIP Publishing LLC.