Abstract
Hydrothermal technique is used to prepare CdSe nanorods (NRs) with the aim of using them in bulk heterojunction solar cell. The CdSe NRs are found to have crystallite size of about 8 nm. The CdSe NRs are characterized by energy dispersive X-ray, X-ray diffraction and high resolution transmission electron microscope. The CdSe NRs are blended with poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and used as active layer in the bulk heterojunction solar cells in the structure of ITO/MoO3/MEH-PPV:CdSe NRs/LiF/Al where ITO is indium tin oxide. The effect of CdSe NRs concentration on the photovoltaic properties of the devices has been studied. The surface morphology and topography of the active layers are examined by scanning and atomic force microscopes, respectively. In addition, the UV–Vis spectra of the active layers together with the pure polymer and CdSe are investigated. By varying the concentration of CdSe NRs, the efficiency of the devices is optimized in which a maximum photoelectrical conversion efficiency of about 2% is obtained.
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