مشخصات پژوهش

عنوان	Optimization of the doping process and light scattering in CdS:Mn quantum dots sensitized solar cells for the efficiency enhancement
نوع پژوهش	مقاله چاپ‌شده
کلیدواژه‌ها	QDSCs, TiO2 Hollow spheres, Mn doping, doping level, Energy conversion efficiency
چکیده	In this work a double-layer photoanode composed of TiO2 nanocrystals (NCs) and hollow spheres (HSs) was applied in CdS:Mn sensitized solar cells. TiO2 NCs with dominant size of 25 nm were synthesized by a facile hydrothermal method. TiO2 HSs were also prepared through the liquid phase deposition (LPD) of TiO2 on carbon spheres followed by a calcination process. The double electron transport layer of quantum dot sensitized solar cells (QDSCs) was formed of a nanocrystalline TiO2 layer covered by a light scattering HSs film. The corresponding thicknesses were also controlled to be about 10 µm and 7 µm, respectively. The sensitization of photoanode with Mn doped CdS NCs were carried out by a successive ionic layer adsorption and reaction (SILAR) technique. The apparent Mn/(Mn+Cd) molar ratio was altered in a wide range of 0-9%. The corresponding QDSCs were fabricated and the doping process was optimized for the improved power conversion efficiencies. According to the results, the QDSCs with a double-layer photoanode sensitized with Mn/(Mn+Cd) ratio of 7.0% showed the maximum efficiency of 3.26%. This value was increased about 61% and 18% compared to those of the reference cells with single nanocrystalline and double-layer photoanodes sensitized with un-doped CdS NCs. The reason was addressed due to the Mn related electron energy states within the bandgap energy of CdS NCs and improved electron transport inside the cells.
پژوهشگران	سمانه بیات (نفر سوم)، پریسا طالبی (نفر دوم)، مازیار مرندی (نفر اول)